From 9dbab972b906ecba5984aaf255c5557b9c0a2857 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Thu, 1 Sep 2016 18:15:44 -0700
Subject: [PATCH 01/39] Emit '_this' declaration for derived classes;
 initialize it when calling 'super(...)'.

---
 src/compiler/transformers/es6.ts | 101 ++++++++++++++++++++++---------
 1 file changed, 72 insertions(+), 29 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 4e994c1acb0fc..aab894dc4ff2e 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -770,7 +770,7 @@ namespace ts {
             const statements: Statement[] = [];
             startLexicalEnvironment();
             if (constructor) {
-                addCaptureThisForNodeIfNeeded(statements, constructor);
+                declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement);
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
             }
@@ -781,6 +781,13 @@ namespace ts {
                 const body = saveStateAndInvoke(constructor, hasSynthesizedSuper ? transformConstructorBodyWithSynthesizedSuper : transformConstructorBodyWithoutSynthesizedSuper);
                 addRange(statements, body);
             }
+            if (constructor ? hasSynthesizedSuper : extendsClauseElement) {
+                statements.push(
+                    createReturn(
+                        createIdentifier("_this")
+                    )
+                );
+            }
 
             addRange(statements, endLexicalEnvironment());
             const block = createBlock(
@@ -800,11 +807,11 @@ namespace ts {
         }
 
         function transformConstructorBodyWithSynthesizedSuper(node: ConstructorDeclaration) {
-            return visitNodes(node.body.statements, visitor, isStatement, 1);
+            return visitNodes(node.body.statements, visitor, isStatement, /*start*/ 1);
         }
 
         function transformConstructorBodyWithoutSynthesizedSuper(node: ConstructorDeclaration) {
-            return visitNodes(node.body.statements, visitor, isStatement, 0);
+            return visitNodes(node.body.statements, visitor, isStatement, /*start*/ 0);
         }
 
         /**
@@ -823,16 +830,27 @@ namespace ts {
             // If this is the case, or if the class has an `extends` clause but no
             // constructor, we emit a synthesized call to `_super`.
             if (constructor ? hasSynthesizedSuper : extendsClauseElement) {
+                const superCall = createFunctionApply(
+                    createIdentifier("_super"),
+                    createThis(),
+                    createIdentifier("arguments"),
+                );
+                const superReturnValueOrThis = createLogicalOr(superCall, createThis());
+
                 statements.push(
-                    createStatement(
-                        createFunctionApply(
-                            createIdentifier("_super"),
-                            createThis(),
-                            createIdentifier("arguments")
-                        ),
-                        /*location*/ extendsClauseElement
-                    )
+                    createVariableStatement(
+                        /*modifiers*/ undefined,
+                        createVariableDeclarationList([
+                            createVariableDeclaration(
+                                "_this",
+                                /*type*/ undefined,
+                                superReturnValueOrThis
+                            )
+                        ]),
+                    /*location*/ extendsClauseElement)
                 );
+
+                enableSubstitutionsForCapturedThis();
             }
         }
 
@@ -1079,6 +1097,15 @@ namespace ts {
             statements.push(forStatement);
         }
 
+        function declareOrCaptureThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean) {
+            if (hasExtendsClause) {
+                captureThisForNode(statements, ctor, /*initializer*/ undefined);
+            }
+            else {
+                addCaptureThisForNodeIfNeeded(statements, ctor);
+            }
+        }
+
         /**
          * Adds a statement to capture the `this` of a function declaration if it is needed.
          *
@@ -1087,24 +1114,28 @@ namespace ts {
          */
         function addCaptureThisForNodeIfNeeded(statements: Statement[], node: Node): void {
             if (node.transformFlags & TransformFlags.ContainsCapturedLexicalThis && node.kind !== SyntaxKind.ArrowFunction) {
-                enableSubstitutionsForCapturedThis();
-                const captureThisStatement = createVariableStatement(
-                    /*modifiers*/ undefined,
-                    createVariableDeclarationList([
-                        createVariableDeclaration(
-                            "_this",
-                            /*type*/ undefined,
-                            createThis()
-                        )
-                    ])
-                );
-
-                setNodeEmitFlags(captureThisStatement, NodeEmitFlags.NoComments | NodeEmitFlags.CustomPrologue);
-                setSourceMapRange(captureThisStatement, node);
-                statements.push(captureThisStatement);
+                captureThisForNode(statements, node, createThis());
             }
         }
 
+        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined) {
+            enableSubstitutionsForCapturedThis();
+            const captureThisStatement = createVariableStatement(
+                /*modifiers*/ undefined,
+                createVariableDeclarationList([
+                    createVariableDeclaration(
+                        "_this",
+                        /*type*/ undefined,
+                        initializer
+                    )
+                ])
+            );
+
+            setNodeEmitFlags(captureThisStatement, NodeEmitFlags.NoComments | NodeEmitFlags.CustomPrologue);
+            setSourceMapRange(captureThisStatement, node);
+            statements.push(captureThisStatement);
+        }
+
         /**
          * Adds statements to the class body function for a class to define the members of the
          * class.
@@ -2468,11 +2499,12 @@ namespace ts {
          *
          * @param node a CallExpression.
          */
-        function visitCallExpression(node: CallExpression): LeftHandSideExpression {
+        function visitCallExpression(node: CallExpression): CallExpression | BinaryExpression {
             // We are here either because SuperKeyword was used somewhere in the expression, or
             // because we contain a SpreadElementExpression.
 
             const { target, thisArg } = createCallBinding(node.expression, hoistVariableDeclaration);
+            let resultingCall: CallExpression | BinaryExpression;
             if (node.transformFlags & TransformFlags.ContainsSpreadElementExpression) {
                 // [source]
                 //      f(...a, b)
@@ -2488,7 +2520,7 @@ namespace ts {
                 //      _super.m.apply(this, a.concat([b]))
                 //      _super.prototype.m.apply(this, a.concat([b]))
 
-                return createFunctionApply(
+                resultingCall = createFunctionApply(
                     visitNode(target, visitor, isExpression),
                     visitNode(thisArg, visitor, isExpression),
                     transformAndSpreadElements(node.arguments, /*needsUniqueCopy*/ false, /*multiLine*/ false, /*hasTrailingComma*/ false)
@@ -2505,13 +2537,24 @@ namespace ts {
                 //      _super.m.call(this, a)
                 //      _super.prototype.m.call(this, a)
 
-                return createFunctionCall(
+                resultingCall = createFunctionCall(
                     visitNode(target, visitor, isExpression),
                     visitNode(thisArg, visitor, isExpression),
                     visitNodes(node.arguments, visitor, isExpression),
                     /*location*/ node
                 );
             }
+
+            if (node.expression.kind === SyntaxKind.SuperKeyword) {
+                return createAssignment(
+                    createIdentifier("_this"),
+                    createLogicalOr(
+                        resultingCall,
+                        createThis()
+                    )
+                );
+            }
+            return resultingCall;
         }
 
         /**

From 99f1df4c0a7de520522cc3ab05aeb5e5ef92ccb9 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Thu, 1 Sep 2016 20:31:21 -0700
Subject: [PATCH 02/39] Accepted baselines.

---
 ...sClassHeritageListMemberTypeAnnotations.js |   3 +-
 ...accessibleTypeInTypeParameterConstraint.js |   3 +-
 .../reference/abstractClassInLocalScope.js    |   3 +-
 .../abstractClassInLocalScopeIsAbstract.js    |   3 +-
 tests/baselines/reference/abstractProperty.js |   3 +-
 .../reference/abstractPropertyNegative.js     |  12 +-
 .../accessOverriddenBaseClassMember1.js       |   3 +-
 .../accessors_spec_section-4.5_inference.js   |   3 +-
 .../reference/aliasUsageInAccessorsOfClass.js |   3 +-
 .../baselines/reference/aliasUsageInArray.js  |   3 +-
 .../aliasUsageInFunctionExpression.js         |   3 +-
 .../reference/aliasUsageInGenericFunction.js  |   3 +-
 .../reference/aliasUsageInIndexerOfClass.js   |   3 +-
 .../reference/aliasUsageInObjectLiteral.js    |   3 +-
 .../reference/aliasUsageInOrExpression.js     |   3 +-
 ...aliasUsageInTypeArgumentOfExtendsClause.js |   6 +-
 .../reference/aliasUsageInVarAssignment.js    |   3 +-
 .../reference/ambiguousOverloadResolution.js  |   3 +-
 .../reference/apparentTypeSubtyping.js        |   6 +-
 .../reference/apparentTypeSupertype.js        |   3 +-
 .../reference/arrayAssignmentTest1.js         |   3 +-
 .../reference/arrayAssignmentTest2.js         |   3 +-
 .../reference/arrayBestCommonTypes.js         |   6 +-
 .../reference/arrayLiteralTypeInference.js    |   6 +-
 tests/baselines/reference/arrayLiterals.js    |   6 +-
 .../arrayLiteralsWithRecursiveGenerics.js     |   3 +-
 ...rayOfSubtypeIsAssignableToReadonlyArray.js |   6 +-
 .../reference/arrowFunctionContexts.js        |   8 +-
 .../assignmentCompatWithCallSignatures3.js    |   9 +-
 .../assignmentCompatWithCallSignatures4.js    |   9 +-
 .../assignmentCompatWithCallSignatures5.js    |   9 +-
 .../assignmentCompatWithCallSignatures6.js    |   9 +-
 ...ssignmentCompatWithConstructSignatures3.js |   9 +-
 ...ssignmentCompatWithConstructSignatures4.js |   9 +-
 ...ssignmentCompatWithConstructSignatures5.js |   9 +-
 ...ssignmentCompatWithConstructSignatures6.js |   9 +-
 .../assignmentCompatWithNumericIndexer.js     |   3 +-
 .../assignmentCompatWithNumericIndexer3.js    |   3 +-
 .../assignmentCompatWithObjectMembers4.js     |  12 +-
 ...nmentCompatWithObjectMembersOptionality.js |   6 +-
 ...mentCompatWithObjectMembersOptionality2.js |   6 +-
 .../assignmentCompatWithStringIndexer.js      |   6 +-
 .../reference/assignmentLHSIsValue.js         |   3 +-
 .../reference/asyncImportedPromise_es5.js     |   3 +-
 .../reference/asyncMethodWithSuper_es5.js     |   3 +-
 .../reference/asyncQualifiedReturnType_es5.js |   3 +-
 tests/baselines/reference/autolift4.js        |   3 +-
 .../reference/awaitClassExpression_es5.js     |   3 +-
 tests/baselines/reference/baseCheck.js        |  15 +-
 .../reference/baseIndexSignatureResolution.js |   3 +-
 .../reference/baseTypeOrderChecking.js        |   6 +-
 .../baseTypeWrappingInstantiationChain.js     |   6 +-
 tests/baselines/reference/bases.js            |   1 +
 .../bestCommonTypeOfConditionalExpressions.js |   6 +-
 ...bestCommonTypeOfConditionalExpressions2.js |   6 +-
 .../reference/bestCommonTypeOfTuple2.js       |   6 +-
 ...allSignatureAssignabilityInInheritance2.js |   9 +-
 ...allSignatureAssignabilityInInheritance3.js |   9 +-
 ...allSignatureAssignabilityInInheritance4.js |   9 +-
 ...allSignatureAssignabilityInInheritance5.js |   9 +-
 ...allSignatureAssignabilityInInheritance6.js |   9 +-
 tests/baselines/reference/callWithSpread.js   |   5 +-
 .../reference/captureThisInSuperCall.js       |   4 +-
 tests/baselines/reference/castingTuple.js     |   6 +-
 .../baselines/reference/chainedAssignment3.js |   3 +-
 ...arameterConstrainedToOtherTypeParameter.js |   6 +-
 .../reference/checkForObjectTooStrict.js      |   6 +-
 .../checkSuperCallBeforeThisAccessing1.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing2.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing3.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing4.js     |   6 +-
 .../checkSuperCallBeforeThisAccessing5.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing6.js     |   4 +-
 .../checkSuperCallBeforeThisAccessing7.js     |   4 +-
 .../checkSuperCallBeforeThisAccessing8.js     |   3 +-
 .../reference/circularImportAlias.js          |   3 +-
 .../circularTypeofWithFunctionModule.js       |   3 +-
 .../classAbstractConstructorAssignability.js  |   6 +-
 .../reference/classAbstractCrashedOnce.js     |   3 +-
 .../reference/classAbstractExtends.js         |  12 +-
 .../reference/classAbstractFactoryFunction.js |   3 +-
 .../reference/classAbstractGeneric.js         |  18 ++-
 .../reference/classAbstractInAModule.js       |   3 +-
 .../reference/classAbstractInheritance.js     |  24 ++-
 .../reference/classAbstractInstantiations1.js |   6 +-
 .../reference/classAbstractInstantiations2.js |  12 +-
 .../classAbstractOverrideWithAbstract.js      |  12 +-
 .../reference/classAbstractSuperCalls.js      |   9 +-
 .../classAbstractUsingAbstractMethod1.js      |   6 +-
 .../classAbstractUsingAbstractMethods2.js     |  21 ++-
 .../classConstructorAccessibility2.js         |   9 +-
 .../classConstructorAccessibility4.js         |   6 +-
 .../classConstructorAccessibility5.js         |   3 +-
 ...classConstructorParametersAccessibility.js |   3 +-
 ...lassConstructorParametersAccessibility2.js |   3 +-
 ...lassConstructorParametersAccessibility3.js |   3 +-
 ...clarationMergedInModuleWithContinuation.js |   3 +-
 .../classDoesNotDependOnBaseTypes.js          |   3 +-
 tests/baselines/reference/classExpression2.js |   3 +-
 tests/baselines/reference/classExpression3.js |   6 +-
 .../classExpressionExtendingAbstractClass.js  |   3 +-
 .../reference/classExtendingBuiltinType.js    |  30 ++--
 .../reference/classExtendingClass.js          |   6 +-
 .../reference/classExtendingClassLikeType.js  |  20 ++-
 .../reference/classExtendingNonConstructor.js |  21 ++-
 .../baselines/reference/classExtendingNull.js |   6 +-
 .../reference/classExtendingPrimitive.js      |  27 ++--
 .../reference/classExtendingPrimitive2.js     |   3 +-
 .../reference/classExtendingQualifiedName.js  |   3 +-
 .../reference/classExtendingQualifiedName2.js |   3 +-
 .../reference/classExtendsAcrossFiles.js      |   6 +-
 ...sMergedWithModuleNotReferingConstructor.js |   3 +-
 ...tendsClauseClassNotReferringConstructor.js |   3 +-
 .../reference/classExtendsEveryObjectType.js  |  18 ++-
 .../reference/classExtendsEveryObjectType2.js |   6 +-
 .../reference/classExtendsInterface.js        |   6 +-
 .../classExtendsInterfaceInExpression.js      |   3 +-
 .../classExtendsInterfaceInModule.js          |   9 +-
 .../baselines/reference/classExtendsItself.js |   9 +-
 .../reference/classExtendsItselfIndirectly.js |  18 ++-
 .../classExtendsItselfIndirectly2.js          |  18 ++-
 .../classExtendsItselfIndirectly3.js          |  18 ++-
 .../classExtendsMultipleBaseClasses.js        |   3 +-
 tests/baselines/reference/classExtendsNull.js |   4 +-
 ...classExtendsShadowedConstructorFunction.js |   3 +-
 .../classExtendsValidConstructorFunction.js   |   3 +-
 .../classHeritageWithTrailingSeparator.js     |   3 +-
 .../reference/classImplementsClass2.js        |   3 +-
 .../reference/classImplementsClass3.js        |   3 +-
 .../reference/classImplementsClass4.js        |   3 +-
 .../reference/classImplementsClass5.js        |   3 +-
 .../reference/classImplementsClass6.js        |   3 +-
 tests/baselines/reference/classIndexer3.js    |   3 +-
 tests/baselines/reference/classInheritence.js |   6 +-
 .../reference/classIsSubtypeOfBaseType.js     |   6 +-
 tests/baselines/reference/classOrder2.js      |   3 +-
 tests/baselines/reference/classOrderBug.js    |   3 +-
 .../reference/classSideInheritance1.js        |   3 +-
 .../reference/classSideInheritance2.js        |   3 +-
 .../reference/classSideInheritance3.js        |   6 +-
 tests/baselines/reference/classUpdateTests.js |  24 ++-
 .../classWithBaseClassButNoConstructor.js     |  12 +-
 .../reference/classWithConstructors.js        |   6 +-
 .../reference/classWithProtectedProperty.js   |   3 +-
 .../reference/classWithStaticMembers.js       |   3 +-
 tests/baselines/reference/classdecl.js        |   9 +-
 .../reference/clodulesDerivedClasses.js       |   3 +-
 ...llisionSuperAndLocalFunctionInAccessors.js |   6 +-
 ...isionSuperAndLocalFunctionInConstructor.js |   6 +-
 .../collisionSuperAndLocalFunctionInMethod.js |   6 +-
 ...ollisionSuperAndLocalFunctionInProperty.js |   3 +-
 .../collisionSuperAndLocalVarInAccessors.js   |   6 +-
 .../collisionSuperAndLocalVarInConstructor.js |   6 +-
 .../collisionSuperAndLocalVarInMethod.js      |   6 +-
 .../collisionSuperAndLocalVarInProperty.js    |   3 +-
 .../collisionSuperAndNameResolution.js        |   3 +-
 .../reference/collisionSuperAndParameter.js   |   6 +-
 .../reference/collisionSuperAndParameter1.js  |   3 +-
 ...perAndPropertyNameAsConstuctorParameter.js |  12 +-
 ...xpressionAndLocalVarWithSuperExperssion.js |   6 +-
 .../reference/commentsInheritance.js          |   6 +-
 .../comparisonOperatorWithIdenticalObjects.js |   6 +-
 ...ithNoRelationshipObjectsOnCallSignature.js |   3 +-
 ...lationshipObjectsOnConstructorSignature.js |   3 +-
 ...thNoRelationshipObjectsOnIndexSignature.js |   3 +-
 ...nshipObjectsOnInstantiatedCallSignature.js |   3 +-
 ...jectsOnInstantiatedConstructorSignature.js |   3 +-
 ...peratorWithSubtypeObjectOnCallSignature.js |   3 +-
 ...WithSubtypeObjectOnConstructorSignature.js |   3 +-
 ...eratorWithSubtypeObjectOnIndexSignature.js |   3 +-
 ...ubtypeObjectOnInstantiatedCallSignature.js |   3 +-
 ...bjectOnInstantiatedConstructorSignature.js |   3 +-
 ...isonOperatorWithSubtypeObjectOnProperty.js |   6 +-
 .../reference/complexClassRelationships.js    |   3 +-
 ...catedGenericRecursiveBaseClassReference.js |   3 +-
 .../reference/compoundAssignmentLHSIsValue.js |   3 +-
 ...poundExponentiationAssignmentLHSIsValue.js |   3 +-
 .../reference/computedPropertyNames24_ES5.js  |   3 +-
 .../reference/computedPropertyNames25_ES5.js  |   3 +-
 .../reference/computedPropertyNames26_ES5.js  |   3 +-
 .../reference/computedPropertyNames27_ES5.js  |   5 +-
 .../reference/computedPropertyNames28_ES5.js  |   5 +-
 .../reference/computedPropertyNames30_ES5.js  |   5 +-
 .../reference/computedPropertyNames31_ES5.js  |   3 +-
 .../reference/computedPropertyNames43_ES5.js  |   3 +-
 .../reference/computedPropertyNames44_ES5.js  |   3 +-
 .../reference/computedPropertyNames45_ES5.js  |   3 +-
 .../conditionalOperatorWithIdenticalBCT.js    |   6 +-
 .../conditionalOperatorWithoutIdenticalBCT.js |   6 +-
 .../reference/constantOverloadFunction.js     |   9 +-
 .../constantOverloadFunctionNoSubtypeError.js |   9 +-
 ...nstraintCheckInGenericBaseTypeReference.js |   3 +-
 ...uctSignatureAssignabilityInInheritance2.js |   9 +-
 ...uctSignatureAssignabilityInInheritance3.js |   9 +-
 ...uctSignatureAssignabilityInInheritance4.js |   9 +-
 ...uctSignatureAssignabilityInInheritance5.js |   9 +-
 ...uctSignatureAssignabilityInInheritance6.js |   9 +-
 tests/baselines/reference/constructorArgs.js  |   3 +-
 ...uctorFunctionTypeIsAssignableToBaseType.js |   6 +-
 ...ctorFunctionTypeIsAssignableToBaseType2.js |   6 +-
 .../constructorHasPrototypeProperty.js        |   6 +-
 .../reference/constructorOverloads2.js        |   3 +-
 .../reference/constructorOverloads3.js        |   1 +
 ...constructorWithIncompleteTypeAnnotation.js |   3 +-
 .../contextualTypingArrayOfLambdas.js         |   6 +-
 ...contextualTypingOfConditionalExpression.js |   6 +-
 ...ontextualTypingOfConditionalExpression2.js |   6 +-
 ...urcePropertyIsRelatableToTargetProperty.js |   3 +-
 .../reference/declFileClassExtendsNull.js     |   3 +-
 .../declFileForFunctionTypeAsTypeParameter.js |   3 +-
 ...ileGenericClassWithGenericExtendedClass.js |   3 +-
 .../reference/declFileGenericType.js          |   3 +-
 .../reference/declFileGenericType2.js         |   6 +-
 ...lictingWithClassReferredByExtendsClause.js |   6 +-
 ...dsClauseThatHasItsContainerNameConflict.js |   3 +-
 .../declarationEmitThisPredicates01.js        |   3 +-
 ...tionEmitThisPredicatesWithPrivateName01.js |   3 +-
 .../declarationEmit_expressionInExtends.js    |   3 +-
 .../declarationEmit_expressionInExtends2.js   |   3 +-
 .../declarationEmit_expressionInExtends3.js   |  12 +-
 .../declarationEmit_expressionInExtends4.js   |   9 +-
 .../declarationEmit_nameConflicts3.js         |   3 +-
 .../declarationEmit_protectedMembers.js       |   6 +-
 .../reference/declareDottedExtend.js          |   6 +-
 .../reference/decoratorOnClassConstructor2.js |   3 +-
 .../reference/decoratorOnClassConstructor3.js |   3 +-
 .../reference/decoratorOnClassMethod12.js     |   3 +-
 ...derivedClassConstructorWithoutSuperCall.js |  10 +-
 ...ClassFunctionOverridesBaseClassAccessor.js |   3 +-
 .../derivedClassIncludesInheritedMembers.js   |   6 +-
 ...idesIndexersWithAssignmentCompatibility.js |   6 +-
 .../derivedClassOverridesPrivateFunction1.js  |   3 +-
 .../derivedClassOverridesPrivates.js          |   6 +-
 .../derivedClassOverridesProtectedMembers.js  |   3 +-
 .../derivedClassOverridesProtectedMembers2.js |   6 +-
 .../derivedClassOverridesProtectedMembers3.js |  30 ++--
 .../derivedClassOverridesProtectedMembers4.js |   6 +-
 .../derivedClassOverridesPublicMembers.js     |   6 +-
 .../derivedClassOverridesWithoutSubtype.js    |   6 +-
 .../derivedClassParameterProperties.js        |  30 ++--
 ...dClassSuperCallsInNonConstructorMembers.js |  19 +--
 .../derivedClassSuperCallsWithThisArg.js      |  13 +-
 .../reference/derivedClassTransitivity.js     |   6 +-
 .../reference/derivedClassTransitivity2.js    |   6 +-
 .../reference/derivedClassTransitivity3.js    |   6 +-
 .../reference/derivedClassTransitivity4.js    |   6 +-
 .../reference/derivedClassWithAny.js          |   6 +-
 ...ivateInstanceShadowingProtectedInstance.js |   3 +-
 ...hPrivateInstanceShadowingPublicInstance.js |   3 +-
 ...thPrivateStaticShadowingProtectedStatic.js |   3 +-
 ...sWithPrivateStaticShadowingPublicStatic.js |   3 +-
 .../derivedClassWithoutExplicitConstructor.js |   6 +-
 ...derivedClassWithoutExplicitConstructor2.js |   6 +-
 ...derivedClassWithoutExplicitConstructor3.js |  12 +-
 tests/baselines/reference/derivedClasses.js   |   6 +-
 .../reference/derivedGenericClassWithAny.js   |   6 +-
 ...sesHiddenBaseCallViaSuperPropertyAccess.js |   3 +-
 .../derivedTypeDoesNotRequireExtendsClause.js |   3 +-
 .../destructuringParameterDeclaration5.js     |   6 +-
 ...BeforeEmitParameterPropertyDeclaration1.js |   3 +-
 ...SuperCallBeforeEmitPropertyDeclaration1.js |   3 +-
 ...arationAndParameterPropertyDeclaration1.js |   3 +-
 .../reference/emitThisInSuperMethodCall.js    |   3 +-
 tests/baselines/reference/emptyModuleName.js  |   3 +-
 ...rorForwardReferenceForwadingConstructor.js |   3 +-
 tests/baselines/reference/errorSuperCalls.js  |  32 ++--
 .../reference/errorSuperPropertyAccess.js     |   9 +-
 .../reference/errorsInGenericTypeReference.js |   3 +-
 .../reference/es6ClassSuperCodegenBug.js      |   5 +-
 tests/baselines/reference/es6ClassTest.js     |   3 +-
 tests/baselines/reference/es6ClassTest2.js    |   6 +-
 tests/baselines/reference/es6ClassTest7.js    |   3 +-
 .../exportAssignmentOfGenericType1.js         |   3 +-
 .../exportDeclarationInInternalModule.js      |   3 +-
 tests/baselines/reference/extBaseClass1.js    |   9 +-
 tests/baselines/reference/extBaseClass2.js    |   6 +-
 .../extendAndImplementTheSameBaseType.js      |   3 +-
 .../extendAndImplementTheSameBaseType2.js     |   3 +-
 .../extendBaseClassBeforeItsDeclared.js       |   3 +-
 .../extendClassExpressionFromModule.js        |   3 +-
 .../extendConstructSignatureInInterface.js    |   3 +-
 .../reference/extendNonClassSymbol1.js        |   3 +-
 .../reference/extendNonClassSymbol2.js        |   3 +-
 ...xtendingClassFromAliasAndUsageInIndexer.js |   6 +-
 .../reference/extendsClauseAlreadySeen.js     |   3 +-
 .../reference/extendsClauseAlreadySeen2.js    |   3 +-
 tests/baselines/reference/fluentClasses.js    |   6 +-
 tests/baselines/reference/for-inStatements.js |   3 +-
 .../reference/for-inStatementsInvalid.js      |   3 +-
 .../forStatementsMultipleInvalidDecl.js       |   3 +-
 .../reference/functionImplementationErrors.js |   6 +-
 .../reference/functionImplementations.js      |   6 +-
 .../reference/functionSubtypingOfVarArgs.js   |   3 +-
 .../reference/functionSubtypingOfVarArgs2.js  |   3 +-
 .../reference/generatedContextualTyping.js    |   6 +-
 .../genericBaseClassLiteralProperty.js        |   3 +-
 .../genericBaseClassLiteralProperty2.js       |   3 +-
 ...allWithConstraintsTypeArgumentInference.js |   6 +-
 .../genericCallWithObjectTypeArgs2.js         |   6 +-
 ...icCallWithObjectTypeArgsAndConstraints2.js |   3 +-
 ...icCallWithObjectTypeArgsAndConstraints3.js |   6 +-
 .../genericCallbacksAndClassHierarchy.js      |   3 +-
 .../genericClassExpressionInFunction.js       |  18 ++-
 ...sInheritsConstructorFromNonGenericClass.js |   6 +-
 ...cClassPropertyInheritanceSpecialization.js |   3 +-
 .../reference/genericClassStaticMethod.js     |   3 +-
 tests/baselines/reference/genericClasses3.js  |   3 +-
 ...genericConstraintOnExtendedBuiltinTypes.js |   3 +-
 ...enericConstraintOnExtendedBuiltinTypes2.js |   3 +-
 .../genericDerivedTypeWithSpecializedBase.js  |   3 +-
 .../genericDerivedTypeWithSpecializedBase2.js |   3 +-
 .../genericInheritedDefaultConstructors.js    |   3 +-
 .../reference/genericPrototypeProperty2.js    |   6 +-
 .../reference/genericPrototypeProperty3.js    |   6 +-
 ...ericRecursiveImplicitConstructorErrors2.js |   3 +-
 ...ericRecursiveImplicitConstructorErrors3.js |   3 +-
 .../reference/genericTypeAssertions2.js       |   3 +-
 .../reference/genericTypeAssertions4.js       |   6 +-
 .../reference/genericTypeAssertions6.js       |   3 +-
 .../reference/genericTypeConstraints.js       |   3 +-
 ...genericTypeReferenceWithoutTypeArgument.js |   6 +-
 ...enericTypeReferenceWithoutTypeArgument2.js |   6 +-
 .../genericWithIndexerOfTypeParameterType2.js |   6 +-
 .../reference/heterogeneousArrayLiterals.js   |   6 +-
 .../reference/ifDoWhileStatements.js          |   3 +-
 .../illegalSuperCallsInConstructor.js         |  11 +-
 .../implementClausePrecedingExtends.js        |   3 +-
 ...gAnInterfaceExtendingClassWithPrivates2.js |  33 ++--
 ...AnInterfaceExtendingClassWithProtecteds.js |  12 +-
 .../baselines/reference/importAsBaseClass.js  |   3 +-
 tests/baselines/reference/importHelpers.js    |   6 +-
 tests/baselines/reference/importHelpersAmd.js |   3 +-
 .../importHelpersInIsolatedModules.js         |   6 +-
 .../reference/importHelpersNoHelpers.js       |   6 +-
 .../reference/importHelpersNoModule.js        |   6 +-
 .../reference/importHelpersOutFile.js         |   6 +-
 .../reference/importHelpersSystem.js          |   3 +-
 .../reference/importShadowsGlobalName.js      |   3 +-
 .../reference/importUsedInExtendsList1.js     |   3 +-
 .../reference/indexerConstraints2.js          |  12 +-
 .../reference/indirectSelfReference.js        |   6 +-
 .../reference/indirectSelfReferenceGeneric.js |   6 +-
 .../infinitelyExpandingTypesNonGenericBase.js |   3 +-
 .../inheritFromGenericTypeParameter.js        |   3 +-
 ...SameNamePrivatePropertiesFromSameOrigin.js |   6 +-
 tests/baselines/reference/inheritance.js      |  12 +-
 tests/baselines/reference/inheritance1.js     |  12 +-
 ...itanceGrandParentPrivateMemberCollision.js |   6 +-
 ...tPrivateMemberCollisionWithPublicMember.js |   6 +-
 ...tPublicMemberCollisionWithPrivateMember.js |   6 +-
 ...ritanceMemberAccessorOverridingAccessor.js |   3 +-
 ...heritanceMemberAccessorOverridingMethod.js |   3 +-
 ...ritanceMemberAccessorOverridingProperty.js |   3 +-
 ...inheritanceMemberFuncOverridingAccessor.js |   3 +-
 .../inheritanceMemberFuncOverridingMethod.js  |   3 +-
 ...inheritanceMemberFuncOverridingProperty.js |   3 +-
 ...ritanceMemberPropertyOverridingAccessor.js |   3 +-
 ...heritanceMemberPropertyOverridingMethod.js |   3 +-
 ...ritanceMemberPropertyOverridingProperty.js |   3 +-
 .../inheritanceOfGenericConstructorMethod1.js |   3 +-
 .../inheritanceOfGenericConstructorMethod2.js |   6 +-
 ...ritanceStaticAccessorOverridingAccessor.js |   3 +-
 ...heritanceStaticAccessorOverridingMethod.js |   3 +-
 ...ritanceStaticAccessorOverridingProperty.js |   3 +-
 ...inheritanceStaticFuncOverridingAccessor.js |   3 +-
 ...eStaticFuncOverridingAccessorOfFuncType.js |   3 +-
 .../inheritanceStaticFuncOverridingMethod.js  |   3 +-
 ...inheritanceStaticFuncOverridingProperty.js |   3 +-
 ...eStaticFuncOverridingPropertyOfFuncType.js |   3 +-
 ...taticFunctionOverridingInstanceProperty.js |   3 +-
 .../inheritanceStaticMembersCompatible.js     |   3 +-
 .../inheritanceStaticMembersIncompatible.js   |   3 +-
 ...ritanceStaticPropertyOverridingAccessor.js |   3 +-
 ...heritanceStaticPropertyOverridingMethod.js |   3 +-
 ...ritanceStaticPropertyOverridingProperty.js |   3 +-
 .../inheritedConstructorWithRestParams.js     |   3 +-
 .../inheritedConstructorWithRestParams2.js    |   6 +-
 .../inheritedModuleMembersForClodule.js       |   6 +-
 .../reference/instanceOfAssignability.js      |   6 +-
 ...nstancePropertiesInheritedIntoClassType.js |   6 +-
 .../reference/instanceSubtypeCheck2.js        |   3 +-
 ...nstanceofWithStructurallyIdenticalTypes.js |   6 +-
 .../instantiatedReturnTypeContravariance.js   |   3 +-
 .../reference/interfaceClassMerging.js        |   3 +-
 .../reference/interfaceClassMerging2.js       |   3 +-
 .../reference/interfaceExtendsClass1.js       |   9 +-
 .../interfaceExtendsClassWithPrivate1.js      |   3 +-
 .../interfaceExtendsClassWithPrivate2.js      |   6 +-
 .../reference/interfaceImplementation8.js     |  12 +-
 .../invalidModuleWithStatementsOfEveryKind.js |  18 ++-
 .../invalidMultipleVariableDeclarations.js    |   3 +-
 .../reference/invalidReturnStatements.js      |   3 +-
 .../isolatedModulesImportExportElision.js     |   3 +-
 tests/baselines/reference/jsxViaImport.js     |   3 +-
 tests/baselines/reference/lambdaArgCrash.js   |   3 +-
 tests/baselines/reference/lift.js             |   3 +-
 tests/baselines/reference/localTypes1.js      |   6 +-
 tests/baselines/reference/m7Bugs.js           |   3 +-
 .../reference/mergedDeclarations5.js          |   3 +-
 .../reference/mergedDeclarations6.js          |   3 +-
 .../mergedInheritedClassInterface.js          |   6 +-
 .../mergedInterfacesWithInheritedPrivates2.js |   6 +-
 .../mergedInterfacesWithInheritedPrivates3.js |   3 +-
 .../missingPropertiesOfClassExpression.js     |   3 +-
 tests/baselines/reference/moduleAsBaseType.js |   3 +-
 .../moduleImportedForTypeArgumentPosition.js  |   3 +-
 .../moduleWithStatementsOfEveryKind.js        |  12 +-
 .../reference/multipleInheritance.js          |  18 ++-
 .../mutuallyRecursiveGenericBaseTypes2.js     |   3 +-
 tests/baselines/reference/noEmitHelpers.js    |   3 +-
 ...enericClassExtendingGenericClassWithAny.js |   3 +-
 ...cIndexerConstrainsPropertyDeclarations2.js |   3 +-
 .../reference/numericIndexerConstraint3.js    |   3 +-
 .../reference/numericIndexerConstraint4.js    |   3 +-
 .../reference/numericIndexerTyping2.js        |   3 +-
 ...objectCreationOfElementAccessExpression.js |  18 ++-
 ...objectTypeHidingMembersOfExtendedObject.js |   3 +-
 ...objectTypesIdentityWithNumericIndexers1.js |   6 +-
 ...objectTypesIdentityWithNumericIndexers2.js |   9 +-
 ...objectTypesIdentityWithNumericIndexers3.js |   6 +-
 .../objectTypesIdentityWithPrivates.js        |   6 +-
 .../objectTypesIdentityWithPrivates2.js       |   3 +-
 .../objectTypesIdentityWithPrivates3.js       |   6 +-
 .../objectTypesIdentityWithStringIndexers.js  |   6 +-
 .../objectTypesIdentityWithStringIndexers2.js |   9 +-
 .../optionalConstructorArgInSuper.js          |   3 +-
 tests/baselines/reference/optionalMethods.js  |   3 +-
 .../reference/optionalParamArgsTest.js        |   3 +-
 .../reference/optionalParamInOverride.js      |   3 +-
 .../reference/optionalParameterProperty.js    |   3 +-
 .../baselines/reference/outModuleConcatAmd.js |   3 +-
 .../reference/outModuleConcatAmd.js.map       |   2 +-
 .../outModuleConcatAmd.sourcemap.txt          |  33 ++--
 .../reference/outModuleConcatSystem.js        |   3 +-
 .../reference/outModuleConcatSystem.js.map    |   2 +-
 .../outModuleConcatSystem.sourcemap.txt       |  33 ++--
 .../reference/outModuleTripleSlashRefs.js     |   3 +-
 .../reference/outModuleTripleSlashRefs.js.map |   2 +-
 .../outModuleTripleSlashRefs.sourcemap.txt    |  33 ++--
 tests/baselines/reference/overload1.js        |   6 +-
 .../overloadOnConstConstraintChecks1.js       |   9 +-
 .../overloadOnConstConstraintChecks2.js       |   6 +-
 .../overloadOnConstConstraintChecks3.js       |   6 +-
 .../overloadOnConstConstraintChecks4.js       |   9 +-
 .../overloadOnConstantsInvalidOverload1.js    |   9 +-
 .../baselines/reference/overloadResolution.js |   9 +-
 .../overloadResolutionClassConstructors.js    |   9 +-
 .../overloadResolutionConstructors.js         |   9 +-
 .../reference/overloadingOnConstants1.js      |   9 +-
 .../reference/overloadingOnConstants2.js      |   3 +-
 .../overridingPrivateStaticMembers.js         |   3 +-
 .../reference/parseErrorInHeritageClause1.js  |   3 +-
 tests/baselines/reference/parser509630.js     |   3 +-
 tests/baselines/reference/parserAstSpans1.js  |   9 +-
 .../reference/parserClassDeclaration1.js      |   3 +-
 .../reference/parserClassDeclaration3.js      |   3 +-
 .../reference/parserClassDeclaration4.js      |   3 +-
 .../reference/parserClassDeclaration5.js      |   3 +-
 .../reference/parserClassDeclaration6.js      |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause2.js |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause4.js |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause5.js |   3 +-
 .../parserGenericsInTypeContexts1.js          |   3 +-
 .../parserGenericsInTypeContexts2.js          |   3 +-
 .../baselines/reference/parserRealSource10.js |  18 ++-
 .../baselines/reference/parserRealSource11.js | 144 ++++++++++++------
 tests/baselines/reference/parserharness.js    |   9 +-
 tests/baselines/reference/primitiveMembers.js |   3 +-
 tests/baselines/reference/privacyClass.js     |  72 ++++++---
 .../privacyClassExtendsClauseDeclFile.js      |  69 ++++++---
 tests/baselines/reference/privacyGloClass.js  |  30 ++--
 .../reference/privateAccessInSubclass1.js     |   3 +-
 .../privateInstanceMemberAccessibility.js     |   3 +-
 ...tedMembersAreNotAccessibleDestructuring.js |   3 +-
 .../privateStaticMemberAccessibility.js       |   3 +-
 .../privateStaticNotAccessibleInClodule2.js   |   3 +-
 .../amd/testGlo.js                            |  12 +-
 .../node/testGlo.js                           |  12 +-
 .../reference/project/prologueEmit/amd/out.js |   3 +-
 .../project/prologueEmit/node/out.js          |   3 +-
 .../amd/m'ain.js                              |   3 +-
 .../node/m'ain.js                             |   3 +-
 .../reference/propertiesAndIndexers.js        |   3 +-
 tests/baselines/reference/propertyAccess.js   |   3 +-
 ...tyAccessOnTypeParameterWithConstraints2.js |   3 +-
 ...tyAccessOnTypeParameterWithConstraints3.js |   3 +-
 ...tyAccessOnTypeParameterWithConstraints5.js |   3 +-
 ...sPropertyAccessibleWithinNestedSubclass.js |   6 +-
 ...PropertyAccessibleWithinNestedSubclass1.js |  12 +-
 ...edClassPropertyAccessibleWithinSubclass.js |   3 +-
 ...dClassPropertyAccessibleWithinSubclass2.js |  12 +-
 ...dClassPropertyAccessibleWithinSubclass3.js |   3 +-
 .../protectedInstanceMemberAccessibility.js   |   6 +-
 tests/baselines/reference/protectedMembers.js |  21 ++-
 ...icClassPropertyAccessibleWithinSubclass.js |   9 +-
 ...cClassPropertyAccessibleWithinSubclass2.js |   6 +-
 ...solution-does-not-affect-class-heritage.js |   3 +-
 .../readonlyConstructorAssignment.js          |   9 +-
 .../reference/recursiveBaseCheck3.js          |   6 +-
 .../reference/recursiveBaseCheck4.js          |   3 +-
 .../reference/recursiveBaseCheck6.js          |   3 +-
 .../recursiveBaseConstructorCreation1.js      |   3 +-
 ...ssInstantiationsWithDefaultConstructors.js |   3 +-
 .../reference/recursiveClassReferenceTest.js  |   3 +-
 .../recursiveClassReferenceTest.js.map        |   2 +-
 .../recursiveClassReferenceTest.sourcemap.txt | 137 ++++++++---------
 .../reference/recursiveComplicatedClasses.js  |   9 +-
 ...sivelySpecializedConstructorDeclaration.js |   3 +-
 .../reference/reexportClassDefinition.js      |   3 +-
 ...lassDeclarationWhenInBaseTypeResolution.js | 141 +++++++++++------
 .../reference/returnInConstructor1.js         |   6 +-
 tests/baselines/reference/returnStatements.js |   3 +-
 ...peCheckExtendedClassInsidePublicMethod2.js |   3 +-
 ...peCheckExtendedClassInsideStaticMethod1.js |   3 +-
 tests/baselines/reference/scopeTests.js       |   3 +-
 .../reference/shadowPrivateMembers.js         |   3 +-
 ...sWithDefaultConstructorAndExtendsClause.js |   3 +-
 ...hDefaultConstructorAndExtendsClause.js.map |   2 +-
 ...tConstructorAndExtendsClause.sourcemap.txt |  59 ++++---
 .../specializedInheritedConstructors1.js      |   3 +-
 .../specializedOverloadWithRestParameters.js  |   3 +-
 tests/baselines/reference/staticFactory1.js   |   3 +-
 .../baselines/reference/staticInheritance.js  |   3 +-
 .../staticMemberAccessOffDerivedType1.js      |   3 +-
 tests/baselines/reference/staticPropSuper.js  |   6 +-
 .../reference/strictModeInConstructor.js      |  18 ++-
 .../reference/strictModeReservedWord.js       |   3 +-
 ...trictModeReservedWordInClassDeclaration.js |   6 +-
 ...gIndexerConstrainsPropertyDeclarations2.js |   3 +-
 .../reference/subtypesOfTypeParameter.js      |   3 +-
 .../subtypesOfTypeParameterWithConstraints.js |  87 +++++++----
 ...subtypesOfTypeParameterWithConstraints4.js |  27 ++--
 ...OfTypeParameterWithRecursiveConstraints.js |  54 ++++---
 .../reference/subtypingTransitivity.js        |   6 +-
 .../reference/subtypingWithCallSignatures2.js |   9 +-
 .../reference/subtypingWithCallSignatures3.js |   9 +-
 .../reference/subtypingWithCallSignatures4.js |   9 +-
 .../subtypingWithConstructSignatures2.js      |   9 +-
 .../subtypingWithConstructSignatures3.js      |   9 +-
 .../subtypingWithConstructSignatures4.js      |   9 +-
 .../subtypingWithConstructSignatures5.js      |   9 +-
 .../subtypingWithConstructSignatures6.js      |   9 +-
 .../reference/subtypingWithNumericIndexer.js  |  18 ++-
 .../reference/subtypingWithNumericIndexer3.js |  21 ++-
 .../reference/subtypingWithNumericIndexer4.js |   9 +-
 .../reference/subtypingWithObjectMembers.js   |  24 ++-
 .../reference/subtypingWithObjectMembers4.js  |  12 +-
 ...subtypingWithObjectMembersAccessibility.js |  12 +-
 ...ubtypingWithObjectMembersAccessibility2.js |  21 ++-
 .../reference/subtypingWithStringIndexer.js   |  18 ++-
 .../reference/subtypingWithStringIndexer3.js  |  21 ++-
 .../reference/subtypingWithStringIndexer4.js  |   9 +-
 tests/baselines/reference/super.js            |   6 +-
 tests/baselines/reference/super1.js           |  15 +-
 tests/baselines/reference/super2.js           |  12 +-
 tests/baselines/reference/superAccess.js      |   3 +-
 tests/baselines/reference/superAccess2.js     |   4 +-
 .../reference/superAccessInFatArrow1.js       |   3 +-
 .../reference/superCallArgsMustMatch.js       |   3 +-
 .../reference/superCallAssignResult.js        |   3 +-
 .../superCallBeforeThisAccessing1.js          |   3 +-
 .../superCallBeforeThisAccessing2.js          |   4 +-
 .../superCallBeforeThisAccessing3.js          |   4 +-
 .../superCallBeforeThisAccessing4.js          |   6 +-
 .../superCallBeforeThisAccessing5.js          |   1 +
 .../superCallBeforeThisAccessing6.js          |   3 +-
 .../superCallBeforeThisAccessing7.js          |   3 +-
 .../superCallBeforeThisAccessing8.js          |   3 +-
 ...allFromClassThatDerivesFromGenericType1.js |   3 +-
 ...allFromClassThatDerivesFromGenericType2.js |   3 +-
 ...eButWithIncorrectNumberOfTypeArguments1.js |   3 +-
 ...sFromGenericTypeButWithNoTypeArguments1.js |   3 +-
 ...ivesNonGenericTypeButWithTypeArguments1.js |   3 +-
 .../superCallFromClassThatHasNoBaseType1.js   |   2 +-
 .../reference/superCallFromFunction1.js       |   2 +-
 .../superCallInConstructorWithNoBaseType.js   |   4 +-
 .../reference/superCallInNonStaticMethod.js   |   4 +-
 .../reference/superCallInStaticMethod.js      |   3 +-
 .../superCallInsideClassDeclaration.js        |   4 +-
 .../superCallInsideClassExpression.js         |   4 +-
 .../superCallInsideObjectLiteralExpression.js |   3 +-
 .../reference/superCallOutsideConstructor.js  |   9 +-
 .../superCallParameterContextualTyping1.js    |   3 +-
 .../superCallParameterContextualTyping2.js    |   3 +-
 .../superCallParameterContextualTyping3.js    |   5 +-
 .../superCallWithMissingBaseClass.js          |   3 +-
 tests/baselines/reference/superCalls.js       |   8 +-
 .../reference/superCallsInConstructor.js      |   5 +-
 tests/baselines/reference/superErrors.js      |   3 +-
 .../baselines/reference/superInCatchBlock1.js |   3 +-
 .../reference/superInConstructorParam1.js     |   1 +
 tests/baselines/reference/superInLambdas.js   |  16 +-
 .../reference/superInObjectLiterals_ES5.js    |   3 +-
 tests/baselines/reference/superNewCall1.js    |   1 +
 .../reference/superPropertyAccess.js          |   3 +-
 .../reference/superPropertyAccess1.js         |   3 +-
 .../reference/superPropertyAccess2.js         |   3 +-
 ...essInComputedPropertiesOfNestedType_ES5.js |   3 +-
 .../reference/superPropertyAccessNoError.js   |   3 +-
 .../reference/superPropertyAccess_ES5.js      |   6 +-
 .../reference/superSymbolIndexedAccess5.js    |   3 +-
 .../reference/superSymbolIndexedAccess6.js    |   3 +-
 .../superWithGenericSpecialization.js         |   3 +-
 .../baselines/reference/superWithGenerics.js  |   3 +-
 .../reference/superWithTypeArgument.js        |   1 +
 .../reference/superWithTypeArgument2.js       |   1 +
 .../reference/superWithTypeArgument3.js       |   1 +
 ...side-object-literal-getters-and-setters.js |   3 +-
 tests/baselines/reference/switchStatements.js |   3 +-
 .../reference/systemModuleWithSuperClass.js   |   3 +-
 .../reference/targetTypeBaseCalls.js          |   3 +-
 .../reference/thisInInvalidContexts.js        |   9 +-
 .../thisInInvalidContextsExternalModule.js    |   9 +-
 tests/baselines/reference/thisInSuperCall.js  |   9 +-
 tests/baselines/reference/thisInSuperCall1.js |   3 +-
 tests/baselines/reference/thisInSuperCall2.js |   6 +-
 tests/baselines/reference/thisInSuperCall3.js |   3 +-
 .../reference/thisTypeInFunctions.js          |   9 +-
 .../reference/thisTypeInFunctionsNegative.js  |   6 +-
 .../baselines/reference/tsxDynamicTagName5.js |   3 +-
 .../baselines/reference/tsxDynamicTagName7.js |   3 +-
 .../baselines/reference/tsxDynamicTagName8.js |   3 +-
 .../baselines/reference/tsxDynamicTagName9.js |   3 +-
 .../reference/tsxExternalModuleEmit1.js       |   6 +-
 .../tsxStatelessFunctionComponents2.js        |   3 +-
 .../reference/tsxUnionTypeComponent1.js       |   6 +-
 tests/baselines/reference/typeAssertions.js   |   3 +-
 .../baselines/reference/typeGuardFunction.js  |   3 +-
 .../reference/typeGuardFunctionErrors.js      |   3 +-
 .../reference/typeGuardFunctionGenerics.js    |   3 +-
 .../reference/typeGuardFunctionOfFormThis.js  |  18 ++-
 .../typeGuardFunctionOfFormThisErrors.js      |   6 +-
 .../reference/typeGuardOfFormInstanceOf.js    |   3 +-
 .../reference/typeGuardOfFormIsType.js        |   3 +-
 .../reference/typeGuardOfFormThisMember.js    |   6 +-
 .../typeGuardOfFormThisMemberErrors.js        |   6 +-
 tests/baselines/reference/typeMatch2.js       |   3 +-
 tests/baselines/reference/typeOfSuperCall.js  |   3 +-
 .../reference/typeParameterAsBaseClass.js     |   3 +-
 .../reference/typeParameterAsBaseType.js      |   6 +-
 .../reference/typeParameterExtendingUnion1.js |   6 +-
 .../reference/typeParameterExtendingUnion2.js |   6 +-
 .../baselines/reference/typeRelationships.js  |   3 +-
 .../baselines/reference/typeValueConflict1.js |   3 +-
 .../baselines/reference/typeValueConflict2.js |   6 +-
 tests/baselines/reference/typeofClass2.js     |   3 +-
 .../typesWithSpecializedCallSignatures.js     |   6 +-
 ...typesWithSpecializedConstructSignatures.js |   6 +-
 tests/baselines/reference/undeclaredBase.js   |   3 +-
 .../undefinedIsSubtypeOfEverything.js         |  66 +++++---
 .../baselines/reference/underscoreMapFirst.js |   3 +-
 .../reference/unionTypeEquivalence.js         |   3 +-
 .../reference/unionTypeFromArrayLiteral.js    |   6 +-
 .../reference/unionTypesAssignability.js      |   6 +-
 tests/baselines/reference/unknownSymbols1.js  |   3 +-
 .../reference/unspecializedConstraints.js     |  12 +-
 ...untypedFunctionCallsWithTypeParameters1.js |   3 +-
 .../reference/unusedClassesinNamespace4.js    |   3 +-
 .../unusedIdentifiersConsolidated1.js         |   3 +-
 .../reference/validUseOfThisInSuper.js        |   4 +-
 .../reference/varArgsOnConstructorTypes.js    |   3 +-
 661 files changed, 2983 insertions(+), 1586 deletions(-)

diff --git a/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js b/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
index 7dcbfef1d727d..de8e08843a2d6 100644
--- a/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
+++ b/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
@@ -38,7 +38,8 @@ var A;
     var Point3d = (function (_super) {
         __extends(Point3d, _super);
         function Point3d() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Point3d;
     }(Point));
diff --git a/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js b/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
index 8f175621af44a..58c7bd4c3c1f6 100644
--- a/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
+++ b/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
@@ -41,7 +41,8 @@ var A;
     var Point3d = (function (_super) {
         __extends(Point3d, _super);
         function Point3d() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Point3d;
     }(Point));
diff --git a/tests/baselines/reference/abstractClassInLocalScope.js b/tests/baselines/reference/abstractClassInLocalScope.js
index a49da04c8a175..04407cfc08c2e 100644
--- a/tests/baselines/reference/abstractClassInLocalScope.js
+++ b/tests/baselines/reference/abstractClassInLocalScope.js
@@ -22,7 +22,8 @@ var __extends = (this && this.__extends) || function (d, b) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js b/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
index 1f6c1dfdd7a00..09109c40675df 100644
--- a/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
+++ b/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
@@ -22,7 +22,8 @@ var __extends = (this && this.__extends) || function (d, b) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/abstractProperty.js b/tests/baselines/reference/abstractProperty.js
index 87b5475111bbd..803df9f1d56cb 100644
--- a/tests/baselines/reference/abstractProperty.js
+++ b/tests/baselines/reference/abstractProperty.js
@@ -35,7 +35,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.raw = "edge";
         this.ro = "readonly please";
     }
diff --git a/tests/baselines/reference/abstractPropertyNegative.js b/tests/baselines/reference/abstractPropertyNegative.js
index 5fc340c58d04f..d6e1ce1813fe9 100644
--- a/tests/baselines/reference/abstractPropertyNegative.js
+++ b/tests/baselines/reference/abstractPropertyNegative.js
@@ -57,7 +57,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.ro = "readonly please";
     }
     Object.defineProperty(C.prototype, "concreteWithNoBody", {
@@ -77,7 +78,8 @@ var WrongTypeProperty = (function () {
 var WrongTypePropertyImpl = (function (_super) {
     __extends(WrongTypePropertyImpl, _super);
     function WrongTypePropertyImpl() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.num = "nope, wrong";
     }
     return WrongTypePropertyImpl;
@@ -90,7 +92,8 @@ var WrongTypeAccessor = (function () {
 var WrongTypeAccessorImpl = (function (_super) {
     __extends(WrongTypeAccessorImpl, _super);
     function WrongTypeAccessorImpl() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(WrongTypeAccessorImpl.prototype, "num", {
         get: function () { return "nope, wrong"; },
@@ -102,7 +105,8 @@ var WrongTypeAccessorImpl = (function (_super) {
 var WrongTypeAccessorImpl2 = (function (_super) {
     __extends(WrongTypeAccessorImpl2, _super);
     function WrongTypeAccessorImpl2() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.num = "nope, wrong";
     }
     return WrongTypeAccessorImpl2;
diff --git a/tests/baselines/reference/accessOverriddenBaseClassMember1.js b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
index c04532078e994..d60f260a163db 100644
--- a/tests/baselines/reference/accessOverriddenBaseClassMember1.js
+++ b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
@@ -34,7 +34,8 @@ var Point = (function () {
 var ColoredPoint = (function (_super) {
     __extends(ColoredPoint, _super);
     function ColoredPoint(x, y, color) {
-        _super.call(this, x, y);
+        var _this;
+        _this = _super.call(this, x, y) || this;
         this.color = color;
     }
     ColoredPoint.prototype.toString = function () {
diff --git a/tests/baselines/reference/accessors_spec_section-4.5_inference.js b/tests/baselines/reference/accessors_spec_section-4.5_inference.js
index 7294aa1aff74a..860d74f5204fb 100644
--- a/tests/baselines/reference/accessors_spec_section-4.5_inference.js
+++ b/tests/baselines/reference/accessors_spec_section-4.5_inference.js
@@ -38,7 +38,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/aliasUsageInAccessorsOfClass.js b/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
index 905ed9bce0e58..d717da94d382c 100644
--- a/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
+++ b/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
@@ -46,7 +46,8 @@ var Backbone = require("./aliasUsage1_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInArray.js b/tests/baselines/reference/aliasUsageInArray.js
index 2d9f7cfed6ec4..f08363776cc2e 100644
--- a/tests/baselines/reference/aliasUsageInArray.js
+++ b/tests/baselines/reference/aliasUsageInArray.js
@@ -40,7 +40,8 @@ var Backbone = require("./aliasUsageInArray_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInFunctionExpression.js b/tests/baselines/reference/aliasUsageInFunctionExpression.js
index 21565dc99fc67..06e3e266ee956 100644
--- a/tests/baselines/reference/aliasUsageInFunctionExpression.js
+++ b/tests/baselines/reference/aliasUsageInFunctionExpression.js
@@ -39,7 +39,8 @@ var Backbone = require("./aliasUsageInFunctionExpression_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInGenericFunction.js b/tests/baselines/reference/aliasUsageInGenericFunction.js
index af24b61cf3330..96121364837be 100644
--- a/tests/baselines/reference/aliasUsageInGenericFunction.js
+++ b/tests/baselines/reference/aliasUsageInGenericFunction.js
@@ -43,7 +43,8 @@ var Backbone = require("./aliasUsageInGenericFunction_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInIndexerOfClass.js b/tests/baselines/reference/aliasUsageInIndexerOfClass.js
index 3b21f15777c90..bbfe295259478 100644
--- a/tests/baselines/reference/aliasUsageInIndexerOfClass.js
+++ b/tests/baselines/reference/aliasUsageInIndexerOfClass.js
@@ -45,7 +45,8 @@ var Backbone = require("./aliasUsageInIndexerOfClass_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInObjectLiteral.js b/tests/baselines/reference/aliasUsageInObjectLiteral.js
index b380104b461c1..3b036f52a9d74 100644
--- a/tests/baselines/reference/aliasUsageInObjectLiteral.js
+++ b/tests/baselines/reference/aliasUsageInObjectLiteral.js
@@ -40,7 +40,8 @@ var Backbone = require("./aliasUsageInObjectLiteral_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInOrExpression.js b/tests/baselines/reference/aliasUsageInOrExpression.js
index 1e9a54203453f..4167294e5f23d 100644
--- a/tests/baselines/reference/aliasUsageInOrExpression.js
+++ b/tests/baselines/reference/aliasUsageInOrExpression.js
@@ -43,7 +43,8 @@ var Backbone = require("./aliasUsageInOrExpression_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
index 76b90c01bf0e3..1893f6586ee03 100644
--- a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
+++ b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
@@ -43,7 +43,8 @@ var Backbone = require("./aliasUsageInTypeArgumentOfExtendsClause_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
@@ -64,7 +65,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = moduleA;
     }
     return D;
diff --git a/tests/baselines/reference/aliasUsageInVarAssignment.js b/tests/baselines/reference/aliasUsageInVarAssignment.js
index 7c73fac2d67d5..0ba5cbbc8d080 100644
--- a/tests/baselines/reference/aliasUsageInVarAssignment.js
+++ b/tests/baselines/reference/aliasUsageInVarAssignment.js
@@ -39,7 +39,8 @@ var Backbone = require("./aliasUsageInVarAssignment_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/ambiguousOverloadResolution.js b/tests/baselines/reference/ambiguousOverloadResolution.js
index 275bbf676024e..27e6dd714baec 100644
--- a/tests/baselines/reference/ambiguousOverloadResolution.js
+++ b/tests/baselines/reference/ambiguousOverloadResolution.js
@@ -22,7 +22,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/apparentTypeSubtyping.js b/tests/baselines/reference/apparentTypeSubtyping.js
index 2d04b059a9a9a..914679c7de26a 100644
--- a/tests/baselines/reference/apparentTypeSubtyping.js
+++ b/tests/baselines/reference/apparentTypeSubtyping.js
@@ -38,7 +38,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -51,7 +52,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/apparentTypeSupertype.js b/tests/baselines/reference/apparentTypeSupertype.js
index de1b1ba11bd72..01fdb92a24ef5 100644
--- a/tests/baselines/reference/apparentTypeSupertype.js
+++ b/tests/baselines/reference/apparentTypeSupertype.js
@@ -28,7 +28,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/arrayAssignmentTest1.js b/tests/baselines/reference/arrayAssignmentTest1.js
index e2ca36cbd1de8..911df30a423d5 100644
--- a/tests/baselines/reference/arrayAssignmentTest1.js
+++ b/tests/baselines/reference/arrayAssignmentTest1.js
@@ -101,7 +101,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C2.prototype.C2M1 = function () { return null; };
     return C2;
diff --git a/tests/baselines/reference/arrayAssignmentTest2.js b/tests/baselines/reference/arrayAssignmentTest2.js
index a15df1b14b7e6..aff812247a27c 100644
--- a/tests/baselines/reference/arrayAssignmentTest2.js
+++ b/tests/baselines/reference/arrayAssignmentTest2.js
@@ -75,7 +75,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C2.prototype.C2M1 = function () { return null; };
     return C2;
diff --git a/tests/baselines/reference/arrayBestCommonTypes.js b/tests/baselines/reference/arrayBestCommonTypes.js
index f45f67a876545..7df398365421e 100644
--- a/tests/baselines/reference/arrayBestCommonTypes.js
+++ b/tests/baselines/reference/arrayBestCommonTypes.js
@@ -128,7 +128,8 @@ var EmptyTypes;
     var derived = (function (_super) {
         __extends(derived, _super);
         function derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return derived;
     }(base));
@@ -187,7 +188,8 @@ var NonEmptyTypes;
     var derived = (function (_super) {
         __extends(derived, _super);
         function derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return derived;
     }(base));
diff --git a/tests/baselines/reference/arrayLiteralTypeInference.js b/tests/baselines/reference/arrayLiteralTypeInference.js
index f54dec83c9c2e..81155544cab8e 100644
--- a/tests/baselines/reference/arrayLiteralTypeInference.js
+++ b/tests/baselines/reference/arrayLiteralTypeInference.js
@@ -65,14 +65,16 @@ var Action = (function () {
 var ActionA = (function (_super) {
     __extends(ActionA, _super);
     function ActionA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ActionA;
 }(Action));
 var ActionB = (function (_super) {
     __extends(ActionB, _super);
     function ActionB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ActionB;
 }(Action));
diff --git a/tests/baselines/reference/arrayLiterals.js b/tests/baselines/reference/arrayLiterals.js
index 4dbf88f868851..53066c7039179 100644
--- a/tests/baselines/reference/arrayLiterals.js
+++ b/tests/baselines/reference/arrayLiterals.js
@@ -70,7 +70,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
@@ -78,7 +79,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js b/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
index c15782a8e2044..3c5f436505371 100644
--- a/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
+++ b/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
@@ -39,7 +39,8 @@ var List = (function () {
 var DerivedList = (function (_super) {
     __extends(DerivedList, _super);
     function DerivedList() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return DerivedList;
 }(List));
diff --git a/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js b/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
index 255b52e16c989..aba7a7cbc8cc1 100644
--- a/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
+++ b/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
@@ -33,14 +33,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(Array));
diff --git a/tests/baselines/reference/arrowFunctionContexts.js b/tests/baselines/reference/arrowFunctionContexts.js
index 73e3be15e1189..bfd49be6bbf59 100644
--- a/tests/baselines/reference/arrowFunctionContexts.js
+++ b/tests/baselines/reference/arrowFunctionContexts.js
@@ -116,8 +116,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = this;
-        _super.call(this, function () { return _this; });
+        var _this;
+        _this = _super.call(this, function () { return _this; }) || this;
     }
     return Derived;
 }(Base));
@@ -158,8 +158,8 @@ var M2;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = this;
-            _super.call(this, function () { return _this; });
+            var _this;
+            _this = _super.call(this, function () { return _this; }) || this;
         }
         return Derived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures3.js b/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
index 24f95ec61eaee..80a9aa9cf148a 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
@@ -114,21 +114,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures4.js b/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
index 43608565039b2..5932aec049a67 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
@@ -115,21 +115,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures5.js b/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
index b3318dd53e814..7ea579d87edaf 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
@@ -80,21 +80,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures6.js b/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
index becbfea57a037..0fb5867836cf1 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
@@ -57,21 +57,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
index d062a563a4dd3..b933425ffb083 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
@@ -114,21 +114,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
index 5744424f8786c..e407c3acdb00b 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
@@ -115,21 +115,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
index de42671c9f1f6..59c816dcc5c2b 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
@@ -80,21 +80,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
index 206ae7768baf6..b3b349ebc06fc 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
@@ -57,21 +57,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithNumericIndexer.js b/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
index 56b206786f1e2..6e14fb66ecdc0 100644
--- a/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
+++ b/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
@@ -72,7 +72,8 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js b/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
index 53f92dd3b592b..3b32f327b073d 100644
--- a/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
+++ b/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
@@ -59,7 +59,8 @@ b = a; // ok
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembers4.js b/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
index 092de2ca7073b..ce80efc3c7a74 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
@@ -108,14 +108,16 @@ var OnlyDerived;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Base));
@@ -167,14 +169,16 @@ var WithBase;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
index 791ae494ab21d..d95eb43f0e570 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
@@ -103,14 +103,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
index d93ddf8b3a4b5..f4c401979cf8c 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
@@ -105,14 +105,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/assignmentCompatWithStringIndexer.js b/tests/baselines/reference/assignmentCompatWithStringIndexer.js
index ef6befe268eb7..54839da4b5a75 100644
--- a/tests/baselines/reference/assignmentCompatWithStringIndexer.js
+++ b/tests/baselines/reference/assignmentCompatWithStringIndexer.js
@@ -82,7 +82,8 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
@@ -93,7 +94,8 @@ var Generics;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A));
diff --git a/tests/baselines/reference/assignmentLHSIsValue.js b/tests/baselines/reference/assignmentLHSIsValue.js
index 8a3b4b35d0b87..070c151ee51fb 100644
--- a/tests/baselines/reference/assignmentLHSIsValue.js
+++ b/tests/baselines/reference/assignmentLHSIsValue.js
@@ -118,7 +118,8 @@ value;
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype. = value;
     }
     Derived.prototype.foo = function () { _super.prototype. = value; };
diff --git a/tests/baselines/reference/asyncImportedPromise_es5.js b/tests/baselines/reference/asyncImportedPromise_es5.js
index 54d1b0fdac824..6fcc24b06bf34 100644
--- a/tests/baselines/reference/asyncImportedPromise_es5.js
+++ b/tests/baselines/reference/asyncImportedPromise_es5.js
@@ -19,7 +19,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Task = (function (_super) {
     __extends(Task, _super);
     function Task() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Task;
 }(Promise));
diff --git a/tests/baselines/reference/asyncMethodWithSuper_es5.js b/tests/baselines/reference/asyncMethodWithSuper_es5.js
index 87debbdc55c2e..22ca0aa0cbefe 100644
--- a/tests/baselines/reference/asyncMethodWithSuper_es5.js
+++ b/tests/baselines/reference/asyncMethodWithSuper_es5.js
@@ -61,7 +61,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     // async method with only call/get on 'super' does not require a binding
     B.prototype.simple = function () {
diff --git a/tests/baselines/reference/asyncQualifiedReturnType_es5.js b/tests/baselines/reference/asyncQualifiedReturnType_es5.js
index 19de38325e2cc..0081a30d93005 100644
--- a/tests/baselines/reference/asyncQualifiedReturnType_es5.js
+++ b/tests/baselines/reference/asyncQualifiedReturnType_es5.js
@@ -13,7 +13,8 @@ var X;
     var MyPromise = (function (_super) {
         __extends(MyPromise, _super);
         function MyPromise() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return MyPromise;
     }(Promise));
diff --git a/tests/baselines/reference/autolift4.js b/tests/baselines/reference/autolift4.js
index e6790021f63f1..85dd3725639a3 100644
--- a/tests/baselines/reference/autolift4.js
+++ b/tests/baselines/reference/autolift4.js
@@ -43,7 +43,8 @@ Point.origin = new Point(0, 0);
 var Point3D = (function (_super) {
     __extends(Point3D, _super);
     function Point3D(x, y, z, m) {
-        _super.call(this, x, y);
+        var _this;
+        _this = _super.call(this, x, y) || this;
         this.z = z;
     }
     Point3D.prototype.getDist = function () {
diff --git a/tests/baselines/reference/awaitClassExpression_es5.js b/tests/baselines/reference/awaitClassExpression_es5.js
index 9123f5f2ea86a..f81b580092901 100644
--- a/tests/baselines/reference/awaitClassExpression_es5.js
+++ b/tests/baselines/reference/awaitClassExpression_es5.js
@@ -17,7 +17,8 @@ function func() {
                     _a = function (_super) {
                         __extends(D, _super);
                         function D() {
-                            _super.apply(this, arguments);
+                            var _this = _super.apply(this, arguments) || this;
+                            return _this;
                         }
                         return D;
                     };
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index c4210f3f6a531..800742ff63b2b 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -43,14 +43,16 @@ var C = (function () {
 var ELoc = (function (_super) {
     __extends(ELoc, _super);
     function ELoc(x) {
-        _super.call(this, 0, x);
+        var _this;
+        _this = _super.call(this, 0, x) || this;
     }
     return ELoc;
 }(C));
 var ELocVar = (function (_super) {
     __extends(ELocVar, _super);
     function ELocVar(x) {
-        _super.call(this, 0, loc);
+        var _this;
+        _this = _super.call(this, 0, loc) || this;
     }
     ELocVar.prototype.m = function () {
         var loc = 10;
@@ -60,7 +62,8 @@ var ELocVar = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D(z) {
-        _super.call(this, this.z);
+        var _this;
+        _this = _super.call(this, this.z) || this;
         this.z = z;
     }
     return D;
@@ -68,7 +71,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E(z) {
-        _super.call(this, 0, this.z);
+        var _this;
+        _this = _super.call(this, 0, this.z) || this;
         this.z = z;
     }
     return E;
@@ -76,7 +80,8 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F(z) {
-        _super.call(this, "hello", this.z);
+        var _this;
+        _this = _super.call(this, "hello", this.z) || this;
         this.z = z;
     }
     return F;
diff --git a/tests/baselines/reference/baseIndexSignatureResolution.js b/tests/baselines/reference/baseIndexSignatureResolution.js
index 3f3fa3cc0b9ca..6629ef35dda61 100644
--- a/tests/baselines/reference/baseIndexSignatureResolution.js
+++ b/tests/baselines/reference/baseIndexSignatureResolution.js
@@ -38,7 +38,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/baseTypeOrderChecking.js b/tests/baselines/reference/baseTypeOrderChecking.js
index 66d2135f01d7d..187a354553df8 100644
--- a/tests/baselines/reference/baseTypeOrderChecking.js
+++ b/tests/baselines/reference/baseTypeOrderChecking.js
@@ -51,7 +51,8 @@ var Class1 = (function () {
 var Class2 = (function (_super) {
     __extends(Class2, _super);
     function Class2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Class2;
 }(Class1));
@@ -63,7 +64,8 @@ var Class3 = (function () {
 var Class4 = (function (_super) {
     __extends(Class4, _super);
     function Class4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Class4;
 }(Class3));
diff --git a/tests/baselines/reference/baseTypeWrappingInstantiationChain.js b/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
index dc52eeeaee600..bbf57046a975c 100644
--- a/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
+++ b/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
@@ -41,7 +41,8 @@ var CBaseBase = (function () {
 var CBase = (function (_super) {
     __extends(CBase, _super);
     function CBase() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return CBase;
 }(CBaseBase));
@@ -59,7 +60,8 @@ var Wrapper = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.works = function () {
         new CBaseBase(this);
diff --git a/tests/baselines/reference/bases.js b/tests/baselines/reference/bases.js
index f67f754d06372..fcf1d7fe124ac 100644
--- a/tests/baselines/reference/bases.js
+++ b/tests/baselines/reference/bases.js
@@ -36,6 +36,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
+        var _this;
         this.x;
         any;
     }
diff --git a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
index 1c2fc896a6ad4..a9e38f0520c8f 100644
--- a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
+++ b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
@@ -44,14 +44,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
index 21a69f517fc4c..9af685812c298 100644
--- a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
+++ b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
@@ -40,14 +40,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/bestCommonTypeOfTuple2.js b/tests/baselines/reference/bestCommonTypeOfTuple2.js
index e38ce2854bd7d..36232ad04b1e8 100644
--- a/tests/baselines/reference/bestCommonTypeOfTuple2.js
+++ b/tests/baselines/reference/bestCommonTypeOfTuple2.js
@@ -46,7 +46,8 @@ var E = (function () {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return F;
 }(C));
@@ -59,7 +60,8 @@ var C1 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.i = "bar";
     }
     return D1;
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
index 6b3bf8e125ef5..4fd0dc2cefc27 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
@@ -84,21 +84,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
index a823047fc0d4e..710725f145be3 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
@@ -131,21 +131,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
index b60cf2014f1e8..154aee0693b06 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
@@ -64,21 +64,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
index 434af36123e8f..7359d330cd6fb 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
@@ -64,21 +64,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
index 9776d14612eb8..594d2dcafb774 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
@@ -67,21 +67,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callWithSpread.js b/tests/baselines/reference/callWithSpread.js
index e89e9d9345bc8..2149db744b06f 100644
--- a/tests/baselines/reference/callWithSpread.js
+++ b/tests/baselines/reference/callWithSpread.js
@@ -99,8 +99,9 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this, 1, 2);
-        _super.apply(this, [1, 2].concat(a));
+        var _this;
+        _this = _super.call(this, 1, 2) || this;
+        _this = _super.apply(this, [1, 2].concat(a)) || this;
     }
     D.prototype.foo = function () {
         _super.prototype.foo.call(this, 1, 2);
diff --git a/tests/baselines/reference/captureThisInSuperCall.js b/tests/baselines/reference/captureThisInSuperCall.js
index 791b6f4c97956..0c36877d9dcbc 100644
--- a/tests/baselines/reference/captureThisInSuperCall.js
+++ b/tests/baselines/reference/captureThisInSuperCall.js
@@ -22,8 +22,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = this;
-        _super.call(this, { test: function () { return _this.someMethod(); } });
+        var _this;
+        _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
     }
     B.prototype.someMethod = function () { };
     return B;
diff --git a/tests/baselines/reference/castingTuple.js b/tests/baselines/reference/castingTuple.js
index bcff0938157c0..426889df7de6b 100644
--- a/tests/baselines/reference/castingTuple.js
+++ b/tests/baselines/reference/castingTuple.js
@@ -59,7 +59,8 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(A));
@@ -67,7 +68,8 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return F;
 }(A));
diff --git a/tests/baselines/reference/chainedAssignment3.js b/tests/baselines/reference/chainedAssignment3.js
index b4b6330a7cf76..71b345a311ca2 100644
--- a/tests/baselines/reference/chainedAssignment3.js
+++ b/tests/baselines/reference/chainedAssignment3.js
@@ -36,7 +36,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js b/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
index c53910e00acad..7c428751b2844 100644
--- a/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
+++ b/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
@@ -42,14 +42,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/checkForObjectTooStrict.js b/tests/baselines/reference/checkForObjectTooStrict.js
index cdc19a5688de4..48825a01a675f 100644
--- a/tests/baselines/reference/checkForObjectTooStrict.js
+++ b/tests/baselines/reference/checkForObjectTooStrict.js
@@ -49,14 +49,16 @@ var Foo;
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return Bar;
 }(Foo.Object));
 var Baz = (function (_super) {
     __extends(Baz, _super);
     function Baz() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return Baz;
 }(Object));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
index cfb5726dac1f1..dc70f3e8d0816 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
@@ -24,7 +24,8 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this;
         this.x = 10;
         var that = this;
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
index afbc15cf912a9..f1fcdb48daef8 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
@@ -24,8 +24,9 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
+        var _this;
         this.x = 100;
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.x = 10;
         var that = this;
     }
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
index 7e9c23c1f8337..d2ede7d04b15f 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
@@ -29,13 +29,14 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
+        var _this;
         var innver = (function () {
             function innver() {
                 this.y = true;
             }
             return innver;
         }());
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.x = 10;
         var that = this;
     }
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
index 1257b446ccbaa..c6eddf4ef4898 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
@@ -33,7 +33,7 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = this;
+        var _this;
         (function () {
             _this; // No error
         });
@@ -43,8 +43,8 @@ var Derived = (function (_super) {
         (function () {
             _this; // No error
         })();
-        _super.call(this);
-        _super.call(this);
+        _this = _super.call(this) || this;
+        _this = _super.call(this) || this;
         this.x = 10;
         var that = this;
     }
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index 1889ee998ca91..e58d55fd274f7 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -25,7 +25,8 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this, this.x);
+        var _this;
+        _this = _super.call(this, this.x) || this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
index 39db4dec17467..15fcbff4c89e9 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
@@ -28,9 +28,9 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = this;
+        var _this;
         (function () { return _this; }); // No Error
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
index d071c05db5d4e..0cade04664dea 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
@@ -23,8 +23,8 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = this;
-        _super.call(this, (function () { return _this; })); // No error
+        var _this;
+        _this = _super.call(this, (function () { return _this; })) || this; // No error
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
index f334cc7f42b86..cf0da205d7189 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
@@ -28,8 +28,9 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
+        var _this;
         var that = this;
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/circularImportAlias.js b/tests/baselines/reference/circularImportAlias.js
index 19c156176bfbd..9d0e7648dcb82 100644
--- a/tests/baselines/reference/circularImportAlias.js
+++ b/tests/baselines/reference/circularImportAlias.js
@@ -32,7 +32,8 @@ var B;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(B.a.C));
diff --git a/tests/baselines/reference/circularTypeofWithFunctionModule.js b/tests/baselines/reference/circularTypeofWithFunctionModule.js
index 6ce1dd62fc5d7..811e86b21cafc 100644
--- a/tests/baselines/reference/circularTypeofWithFunctionModule.js
+++ b/tests/baselines/reference/circularTypeofWithFunctionModule.js
@@ -32,7 +32,8 @@ var maker;
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar;
     }(Foo));
diff --git a/tests/baselines/reference/classAbstractConstructorAssignability.js b/tests/baselines/reference/classAbstractConstructorAssignability.js
index 5695e6c79d3cb..8738b43bb3fb3 100644
--- a/tests/baselines/reference/classAbstractConstructorAssignability.js
+++ b/tests/baselines/reference/classAbstractConstructorAssignability.js
@@ -28,14 +28,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/classAbstractCrashedOnce.js b/tests/baselines/reference/classAbstractCrashedOnce.js
index 46f0a8938c417..02d31377de87f 100644
--- a/tests/baselines/reference/classAbstractCrashedOnce.js
+++ b/tests/baselines/reference/classAbstractCrashedOnce.js
@@ -24,7 +24,8 @@ var foo = (function () {
 var bar = (function (_super) {
     __extends(bar, _super);
     function bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     bar.prototype.test = function () {
         this.
diff --git a/tests/baselines/reference/classAbstractExtends.js b/tests/baselines/reference/classAbstractExtends.js
index 8d7128cc03d30..8ac2cc9de3de7 100644
--- a/tests/baselines/reference/classAbstractExtends.js
+++ b/tests/baselines/reference/classAbstractExtends.js
@@ -31,28 +31,32 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(B));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.bar = function () { };
     return E;
diff --git a/tests/baselines/reference/classAbstractFactoryFunction.js b/tests/baselines/reference/classAbstractFactoryFunction.js
index d5b0417f99596..4f612e3d9c692 100644
--- a/tests/baselines/reference/classAbstractFactoryFunction.js
+++ b/tests/baselines/reference/classAbstractFactoryFunction.js
@@ -31,7 +31,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/classAbstractGeneric.js b/tests/baselines/reference/classAbstractGeneric.js
index c9409e9746687..b76117fddfc01 100644
--- a/tests/baselines/reference/classAbstractGeneric.js
+++ b/tests/baselines/reference/classAbstractGeneric.js
@@ -39,28 +39,32 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A)); // error -- inherits abstract methods
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(A)); // error -- inherits abstract methods
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function () { return this.t; };
     return E;
@@ -68,7 +72,8 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     F.prototype.bar = function (t) { };
     return F;
@@ -76,7 +81,8 @@ var F = (function (_super) {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     G.prototype.foo = function () { return this.t; };
     G.prototype.bar = function (t) { };
diff --git a/tests/baselines/reference/classAbstractInAModule.js b/tests/baselines/reference/classAbstractInAModule.js
index 17fbf568601b9..aa66ba540a80b 100644
--- a/tests/baselines/reference/classAbstractInAModule.js
+++ b/tests/baselines/reference/classAbstractInAModule.js
@@ -24,7 +24,8 @@ var M;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classAbstractInheritance.js b/tests/baselines/reference/classAbstractInheritance.js
index 4d5c804e55784..0bd5dab31a997 100644
--- a/tests/baselines/reference/classAbstractInheritance.js
+++ b/tests/baselines/reference/classAbstractInheritance.js
@@ -35,14 +35,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
@@ -54,42 +56,48 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return BB;
 }(AA));
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return CC;
 }(AA));
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return DD;
 }(BB));
 var EE = (function (_super) {
     __extends(EE, _super);
     function EE() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return EE;
 }(BB));
 var FF = (function (_super) {
     __extends(FF, _super);
     function FF() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return FF;
 }(CC));
 var GG = (function (_super) {
     __extends(GG, _super);
     function GG() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return GG;
 }(CC));
diff --git a/tests/baselines/reference/classAbstractInstantiations1.js b/tests/baselines/reference/classAbstractInstantiations1.js
index 0263e9e97b36c..aef8f58fab256 100644
--- a/tests/baselines/reference/classAbstractInstantiations1.js
+++ b/tests/baselines/reference/classAbstractInstantiations1.js
@@ -41,14 +41,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/classAbstractInstantiations2.js b/tests/baselines/reference/classAbstractInstantiations2.js
index 379e0b18cccde..2e6cd648dc08a 100644
--- a/tests/baselines/reference/classAbstractInstantiations2.js
+++ b/tests/baselines/reference/classAbstractInstantiations2.js
@@ -82,21 +82,24 @@ new x; // okay -- undefined behavior at runtime
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B)); // error -- not declared abstract
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(B)); // okay
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.bar = function () { return 1; };
     return E;
@@ -104,7 +107,8 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     F.prototype.bar = function () { return 2; };
     return F;
diff --git a/tests/baselines/reference/classAbstractOverrideWithAbstract.js b/tests/baselines/reference/classAbstractOverrideWithAbstract.js
index d613dd1fe31f5..5cb07934658d1 100644
--- a/tests/baselines/reference/classAbstractOverrideWithAbstract.js
+++ b/tests/baselines/reference/classAbstractOverrideWithAbstract.js
@@ -38,7 +38,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -51,7 +52,8 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     BB.prototype.bar = function () { };
     return BB;
@@ -59,14 +61,16 @@ var BB = (function (_super) {
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return CC;
 }(BB)); // error
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     DD.prototype.foo = function () { };
     return DD;
diff --git a/tests/baselines/reference/classAbstractSuperCalls.js b/tests/baselines/reference/classAbstractSuperCalls.js
index 7ada903974cb8..44b15710c732e 100644
--- a/tests/baselines/reference/classAbstractSuperCalls.js
+++ b/tests/baselines/reference/classAbstractSuperCalls.js
@@ -42,7 +42,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () { _super.prototype.foo.call(this); };
     B.prototype.baz = function () { return this.foo; };
@@ -51,7 +52,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () { return 2; };
     C.prototype.qux = function () { return _super.prototype.foo.call(this) || _super.prototype.foo; }; // 2 errors, foo is abstract
@@ -68,7 +70,8 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return BB;
 }(AA));
diff --git a/tests/baselines/reference/classAbstractUsingAbstractMethod1.js b/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
index 457195f5449aa..ae6b08e4bcac5 100644
--- a/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
+++ b/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
@@ -31,7 +31,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.foo = function () { return 1; };
     return B;
@@ -39,7 +40,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classAbstractUsingAbstractMethods2.js b/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
index dc025b11ddec1..9f43ee1a6b3cb 100644
--- a/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
+++ b/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
@@ -41,21 +41,24 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function () { };
     return D;
@@ -63,7 +66,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function () { };
     return E;
@@ -76,21 +80,24 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return BB;
 }(AA));
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return CC;
 }(AA));
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     DD.prototype.foo = function () { };
     return DD;
diff --git a/tests/baselines/reference/classConstructorAccessibility2.js b/tests/baselines/reference/classConstructorAccessibility2.js
index 03b7af3e716c1..95206681372ee 100644
--- a/tests/baselines/reference/classConstructorAccessibility2.js
+++ b/tests/baselines/reference/classConstructorAccessibility2.js
@@ -77,7 +77,8 @@ var BaseC = (function () {
 var DerivedA = (function (_super) {
     __extends(DerivedA, _super);
     function DerivedA(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.x = x;
     }
     DerivedA.prototype.createInstance = function () { new DerivedA(5); };
@@ -88,7 +89,8 @@ var DerivedA = (function (_super) {
 var DerivedB = (function (_super) {
     __extends(DerivedB, _super);
     function DerivedB(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.x = x;
     }
     DerivedB.prototype.createInstance = function () { new DerivedB(7); };
@@ -99,7 +101,8 @@ var DerivedB = (function (_super) {
 var DerivedC = (function (_super) {
     __extends(DerivedC, _super);
     function DerivedC(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.x = x;
     }
     DerivedC.prototype.createInstance = function () { new DerivedC(9); };
diff --git a/tests/baselines/reference/classConstructorAccessibility4.js b/tests/baselines/reference/classConstructorAccessibility4.js
index 6342facae21fa..dfbc70de115b0 100644
--- a/tests/baselines/reference/classConstructorAccessibility4.js
+++ b/tests/baselines/reference/classConstructorAccessibility4.js
@@ -51,7 +51,8 @@ var A = (function () {
         var C = (function (_super) {
             __extends(C, _super);
             function C() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return C;
         }(A));
@@ -73,7 +74,8 @@ var D = (function () {
         var F = (function (_super) {
             __extends(F, _super);
             function F() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return F;
         }(D));
diff --git a/tests/baselines/reference/classConstructorAccessibility5.js b/tests/baselines/reference/classConstructorAccessibility5.js
index ec9e9f83a8e41..b73ecb4a92b39 100644
--- a/tests/baselines/reference/classConstructorAccessibility5.js
+++ b/tests/baselines/reference/classConstructorAccessibility5.js
@@ -25,7 +25,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.make = function () { new Base(); }; // ok
     return Derived;
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility.js b/tests/baselines/reference/classConstructorParametersAccessibility.js
index c31fd8bf9dd15..1f282ba71322d 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility.js
@@ -59,7 +59,8 @@ c3.p; // protected, error
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        _super.call(this, p);
+        var _this;
+        _this = _super.call(this, p) || this;
         this.p; // OK
     }
     return Derived;
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility2.js b/tests/baselines/reference/classConstructorParametersAccessibility2.js
index 7f52a6a581fc2..81ad696ddc86c 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility2.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility2.js
@@ -59,7 +59,8 @@ c3.p; // protected, error
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        _super.call(this, p);
+        var _this;
+        _this = _super.call(this, p) || this;
         this.p; // OK
     }
     return Derived;
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility3.js b/tests/baselines/reference/classConstructorParametersAccessibility3.js
index 0da9449a3a71f..95509867cc574 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility3.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility3.js
@@ -28,7 +28,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        _super.call(this, p);
+        var _this;
+        _this = _super.call(this, p) || this;
         this.p = p;
         this.p; // OK
     }
diff --git a/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js b/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
index 7ab6cb2cecaf4..83152355a137b 100644
--- a/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
+++ b/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
@@ -35,7 +35,8 @@ var M;
     var O = (function (_super) {
         __extends(O, _super);
         function O() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return O;
     }(M.N));
diff --git a/tests/baselines/reference/classDoesNotDependOnBaseTypes.js b/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
index 5a455edc082a7..ef584afd6e9e4 100644
--- a/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
+++ b/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
@@ -31,7 +31,8 @@ var StringTreeCollectionBase = (function () {
 var StringTreeCollection = (function (_super) {
     __extends(StringTreeCollection, _super);
     function StringTreeCollection() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return StringTreeCollection;
 }(StringTreeCollectionBase));
diff --git a/tests/baselines/reference/classExpression2.js b/tests/baselines/reference/classExpression2.js
index ed9497c8729c0..f7405cfd38ac3 100644
--- a/tests/baselines/reference/classExpression2.js
+++ b/tests/baselines/reference/classExpression2.js
@@ -16,7 +16,8 @@ var D = (function () {
 var v = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(D));
diff --git a/tests/baselines/reference/classExpression3.js b/tests/baselines/reference/classExpression3.js
index 508dc039387e9..b91d541361129 100644
--- a/tests/baselines/reference/classExpression3.js
+++ b/tests/baselines/reference/classExpression3.js
@@ -15,14 +15,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(class_1, _super);
     function class_1() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.c = 3;
     }
     return class_1;
 }((function (_super) {
     __extends(class_2, _super);
     function class_2() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.b = 2;
     }
     return class_2;
diff --git a/tests/baselines/reference/classExpressionExtendingAbstractClass.js b/tests/baselines/reference/classExpressionExtendingAbstractClass.js
index c4da02cb3219d..8673e48d65f8f 100644
--- a/tests/baselines/reference/classExpressionExtendingAbstractClass.js
+++ b/tests/baselines/reference/classExpressionExtendingAbstractClass.js
@@ -22,7 +22,8 @@ var A = (function () {
 var C = (function (_super) {
     __extends(class_1, _super);
     function class_1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return class_1;
 }(A));
diff --git a/tests/baselines/reference/classExtendingBuiltinType.js b/tests/baselines/reference/classExtendingBuiltinType.js
index ace4cf19feef9..2a01c1aa8b3d2 100644
--- a/tests/baselines/reference/classExtendingBuiltinType.js
+++ b/tests/baselines/reference/classExtendingBuiltinType.js
@@ -20,70 +20,80 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C1;
 }(Object));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(Function));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C3;
 }(String));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(Boolean));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5;
 }(Number));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }(Date));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C7;
 }(RegExp));
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C8;
 }(Error));
 var C9 = (function (_super) {
     __extends(C9, _super);
     function C9() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C9;
 }(Array));
 var C10 = (function (_super) {
     __extends(C10, _super);
     function C10() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C10;
 }(Array));
diff --git a/tests/baselines/reference/classExtendingClass.js b/tests/baselines/reference/classExtendingClass.js
index 8073271b5eac1..4218bfbea98f4 100644
--- a/tests/baselines/reference/classExtendingClass.js
+++ b/tests/baselines/reference/classExtendingClass.js
@@ -47,7 +47,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -66,7 +67,8 @@ var C2 = (function () {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(C2));
diff --git a/tests/baselines/reference/classExtendingClassLikeType.js b/tests/baselines/reference/classExtendingClassLikeType.js
index a41bb14451aad..031253a19ade2 100644
--- a/tests/baselines/reference/classExtendingClassLikeType.js
+++ b/tests/baselines/reference/classExtendingClassLikeType.js
@@ -68,14 +68,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D0 = (function (_super) {
     __extends(D0, _super);
     function D0() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D0;
 }(Base));
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.call(this, "abc", "def");
+        var _this;
+        _this = _super.call(this, "abc", "def") || this;
         this.x = "x";
         this.y = "y";
     }
@@ -84,8 +86,9 @@ var D1 = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.call(this, 10);
-        _super.call(this, 10, 20);
+        var _this;
+        _this = _super.call(this, 10) || this;
+        _this = _super.call(this, 10, 20) || this;
         this.x = 1;
         this.y = 2;
     }
@@ -94,7 +97,8 @@ var D2 = (function (_super) {
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        _super.call(this, "abc", 42);
+        var _this;
+        _this = _super.call(this, "abc", 42) || this;
         this.x = "x";
         this.y = 2;
     }
@@ -104,7 +108,8 @@ var D3 = (function (_super) {
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D4;
 }(getBase()));
@@ -112,7 +117,8 @@ var D4 = (function (_super) {
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D5;
 }(getBadBase()));
diff --git a/tests/baselines/reference/classExtendingNonConstructor.js b/tests/baselines/reference/classExtendingNonConstructor.js
index c46e3c5ddbe85..d33e6b4edefd7 100644
--- a/tests/baselines/reference/classExtendingNonConstructor.js
+++ b/tests/baselines/reference/classExtendingNonConstructor.js
@@ -27,49 +27,56 @@ function foo() {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C1;
 }(undefined));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(true));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C3;
 }(false));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(42));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5;
 }("hello"));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }(x));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C7;
 }(foo));
diff --git a/tests/baselines/reference/classExtendingNull.js b/tests/baselines/reference/classExtendingNull.js
index fa6f0357b0dc1..d6188aaf988c6 100644
--- a/tests/baselines/reference/classExtendingNull.js
+++ b/tests/baselines/reference/classExtendingNull.js
@@ -12,14 +12,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C1;
 }(null));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }((null)));
diff --git a/tests/baselines/reference/classExtendingPrimitive.js b/tests/baselines/reference/classExtendingPrimitive.js
index 8ecad9c24a57c..c23683470d037 100644
--- a/tests/baselines/reference/classExtendingPrimitive.js
+++ b/tests/baselines/reference/classExtendingPrimitive.js
@@ -24,28 +24,32 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(number));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(string));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C3;
 }(boolean));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(Void));
@@ -58,28 +62,32 @@ void {};
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5;
 }(Null));
 var C5a = (function (_super) {
     __extends(C5a, _super);
     function C5a() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5a;
 }(null));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }(undefined));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C7;
 }(Undefined));
@@ -90,7 +98,8 @@ var E;
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C8;
 }(E));
diff --git a/tests/baselines/reference/classExtendingPrimitive2.js b/tests/baselines/reference/classExtendingPrimitive2.js
index af76697796741..072dc8138c78b 100644
--- a/tests/baselines/reference/classExtendingPrimitive2.js
+++ b/tests/baselines/reference/classExtendingPrimitive2.js
@@ -20,7 +20,8 @@ void {};
 var C5a = (function (_super) {
     __extends(C5a, _super);
     function C5a() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5a;
 }(null));
diff --git a/tests/baselines/reference/classExtendingQualifiedName.js b/tests/baselines/reference/classExtendingQualifiedName.js
index 17d888834ec10..b5cf4ae13820e 100644
--- a/tests/baselines/reference/classExtendingQualifiedName.js
+++ b/tests/baselines/reference/classExtendingQualifiedName.js
@@ -23,7 +23,8 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(M.C));
diff --git a/tests/baselines/reference/classExtendingQualifiedName2.js b/tests/baselines/reference/classExtendingQualifiedName2.js
index 4f1d872e75339..d1ee8b48b3a23 100644
--- a/tests/baselines/reference/classExtendingQualifiedName2.js
+++ b/tests/baselines/reference/classExtendingQualifiedName2.js
@@ -24,7 +24,8 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(M.C));
diff --git a/tests/baselines/reference/classExtendsAcrossFiles.js b/tests/baselines/reference/classExtendsAcrossFiles.js
index 0805389f2684e..0dcf4103f49da 100644
--- a/tests/baselines/reference/classExtendsAcrossFiles.js
+++ b/tests/baselines/reference/classExtendsAcrossFiles.js
@@ -37,7 +37,8 @@ exports.b = {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return B;
         }(A));
@@ -62,7 +63,8 @@ exports.a = {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return B;
         }(A));
diff --git a/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js b/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
index 80b4b7c175d56..f1a695c0b2ac4 100644
--- a/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
+++ b/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
@@ -33,7 +33,8 @@ var Foo;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js b/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
index 4c593761f0099..f754e140d37df 100644
--- a/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
+++ b/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
@@ -23,7 +23,8 @@ var Foo;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classExtendsEveryObjectType.js b/tests/baselines/reference/classExtendsEveryObjectType.js
index 8b4663ad2cb31..584b31b7e8e8e 100644
--- a/tests/baselines/reference/classExtendsEveryObjectType.js
+++ b/tests/baselines/reference/classExtendsEveryObjectType.js
@@ -25,14 +25,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(I)); // error
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }({ foo: string })); // error
@@ -40,7 +42,8 @@ var x;
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C3;
 }(x)); // error
@@ -51,7 +54,8 @@ var M;
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(M)); // error
@@ -59,14 +63,16 @@ function foo() { }
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5;
 }(foo)); // error
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }([])); // error
diff --git a/tests/baselines/reference/classExtendsEveryObjectType2.js b/tests/baselines/reference/classExtendsEveryObjectType2.js
index 6aceb0ffebf2a..e01e90d512d68 100644
--- a/tests/baselines/reference/classExtendsEveryObjectType2.js
+++ b/tests/baselines/reference/classExtendsEveryObjectType2.js
@@ -12,14 +12,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }({ foo: string })); // error
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }([])); // error
diff --git a/tests/baselines/reference/classExtendsInterface.js b/tests/baselines/reference/classExtendsInterface.js
index b324f7382d820..7047eaad658c2 100644
--- a/tests/baselines/reference/classExtendsInterface.js
+++ b/tests/baselines/reference/classExtendsInterface.js
@@ -17,7 +17,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(Comparable));
@@ -29,7 +30,8 @@ var B = (function () {
 var A2 = (function (_super) {
     __extends(A2, _super);
     function A2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A2;
 }(Comparable2));
diff --git a/tests/baselines/reference/classExtendsInterfaceInExpression.js b/tests/baselines/reference/classExtendsInterfaceInExpression.js
index 69e63f925707c..64d519d6952b7 100644
--- a/tests/baselines/reference/classExtendsInterfaceInExpression.js
+++ b/tests/baselines/reference/classExtendsInterfaceInExpression.js
@@ -20,7 +20,8 @@ function factory(a) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(factory(A)));
diff --git a/tests/baselines/reference/classExtendsInterfaceInModule.js b/tests/baselines/reference/classExtendsInterfaceInModule.js
index 454154887003f..ced164bca102f 100644
--- a/tests/baselines/reference/classExtendsInterfaceInModule.js
+++ b/tests/baselines/reference/classExtendsInterfaceInModule.js
@@ -24,21 +24,24 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C1;
 }(M.I1));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(M.I2));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(Mod.Nested.I));
diff --git a/tests/baselines/reference/classExtendsItself.js b/tests/baselines/reference/classExtendsItself.js
index 279d0ad6899da..654cd35c400e7 100644
--- a/tests/baselines/reference/classExtendsItself.js
+++ b/tests/baselines/reference/classExtendsItself.js
@@ -14,21 +14,24 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(C)); // error
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(D)); // error
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(E)); // error
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly.js b/tests/baselines/reference/classExtendsItselfIndirectly.js
index f8ea40ee69ccc..ae5852d91f9a1 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly.js
@@ -20,42 +20,48 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(E)); // error
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(D));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(E2)); // error
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(C2));
 var E2 = (function (_super) {
     __extends(E2, _super);
     function E2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E2;
 }(D2));
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly2.js b/tests/baselines/reference/classExtendsItselfIndirectly2.js
index 269edb851e9fd..63eeb5bc17840 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly2.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly2.js
@@ -31,7 +31,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(N.E)); // error
@@ -40,7 +41,8 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
@@ -51,7 +53,8 @@ var N;
     var E = (function (_super) {
         __extends(E, _super);
         function E() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return E;
     }(M.D));
@@ -62,7 +65,8 @@ var O;
     var C2 = (function (_super) {
         __extends(C2, _super);
         function C2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C2;
     }(Q.E2)); // error
@@ -71,7 +75,8 @@ var O;
         var D2 = (function (_super) {
             __extends(D2, _super);
             function D2() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return D2;
         }(C2));
@@ -82,7 +87,8 @@ var O;
         var E2 = (function (_super) {
             __extends(E2, _super);
             function E2() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return E2;
         }(P.D2));
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly3.js b/tests/baselines/reference/classExtendsItselfIndirectly3.js
index 2d2cf938156fb..4e67909f2d3be 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly3.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly3.js
@@ -27,7 +27,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(E)); // error
@@ -40,7 +41,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -53,7 +55,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(D));
@@ -66,7 +69,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(E2)); // error
@@ -79,7 +83,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(C2));
@@ -92,7 +97,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var E2 = (function (_super) {
     __extends(E2, _super);
     function E2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E2;
 }(D2));
diff --git a/tests/baselines/reference/classExtendsMultipleBaseClasses.js b/tests/baselines/reference/classExtendsMultipleBaseClasses.js
index 61db0a41a5ca2..a185f6cf40a51 100644
--- a/tests/baselines/reference/classExtendsMultipleBaseClasses.js
+++ b/tests/baselines/reference/classExtendsMultipleBaseClasses.js
@@ -22,7 +22,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classExtendsNull.js b/tests/baselines/reference/classExtendsNull.js
index afb2be21c686f..3ff1c92a56e4c 100644
--- a/tests/baselines/reference/classExtendsNull.js
+++ b/tests/baselines/reference/classExtendsNull.js
@@ -21,7 +21,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         return Object.create(null);
     }
     return C;
@@ -29,6 +30,7 @@ var C = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         return Object.create(null);
     }
     return D;
diff --git a/tests/baselines/reference/classExtendsShadowedConstructorFunction.js b/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
index ae2f73cadc182..a7f4a4bb9d951 100644
--- a/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
+++ b/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
@@ -25,7 +25,8 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/classExtendsValidConstructorFunction.js b/tests/baselines/reference/classExtendsValidConstructorFunction.js
index 00cd35693f132..519074358cc7b 100644
--- a/tests/baselines/reference/classExtendsValidConstructorFunction.js
+++ b/tests/baselines/reference/classExtendsValidConstructorFunction.js
@@ -16,7 +16,8 @@ var x = new foo(); // can be used as a constructor function
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(foo)); // error, cannot extend it though
diff --git a/tests/baselines/reference/classHeritageWithTrailingSeparator.js b/tests/baselines/reference/classHeritageWithTrailingSeparator.js
index 7f85e4e25d731..d3134a97ccd4f 100644
--- a/tests/baselines/reference/classHeritageWithTrailingSeparator.js
+++ b/tests/baselines/reference/classHeritageWithTrailingSeparator.js
@@ -17,7 +17,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/classImplementsClass2.js b/tests/baselines/reference/classImplementsClass2.js
index 09cdd5c779bb2..d525fb8a6ad07 100644
--- a/tests/baselines/reference/classImplementsClass2.js
+++ b/tests/baselines/reference/classImplementsClass2.js
@@ -33,7 +33,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C2.prototype.foo = function () {
         return 1;
diff --git a/tests/baselines/reference/classImplementsClass3.js b/tests/baselines/reference/classImplementsClass3.js
index b47514b1286be..3257e51b5b883 100644
--- a/tests/baselines/reference/classImplementsClass3.js
+++ b/tests/baselines/reference/classImplementsClass3.js
@@ -37,7 +37,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass4.js b/tests/baselines/reference/classImplementsClass4.js
index 32ae1ef3e8824..f0b8698c64d3d 100644
--- a/tests/baselines/reference/classImplementsClass4.js
+++ b/tests/baselines/reference/classImplementsClass4.js
@@ -40,7 +40,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass5.js b/tests/baselines/reference/classImplementsClass5.js
index 923ac9c98299d..bf5d0141a1973 100644
--- a/tests/baselines/reference/classImplementsClass5.js
+++ b/tests/baselines/reference/classImplementsClass5.js
@@ -42,7 +42,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass6.js b/tests/baselines/reference/classImplementsClass6.js
index a807590749ef5..f1929cdc798d0 100644
--- a/tests/baselines/reference/classImplementsClass6.js
+++ b/tests/baselines/reference/classImplementsClass6.js
@@ -47,7 +47,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classIndexer3.js b/tests/baselines/reference/classIndexer3.js
index 39fb844613e93..ab825abcd3185 100644
--- a/tests/baselines/reference/classIndexer3.js
+++ b/tests/baselines/reference/classIndexer3.js
@@ -24,7 +24,8 @@ var C123 = (function () {
 var D123 = (function (_super) {
     __extends(D123, _super);
     function D123() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D123;
 }(C123));
diff --git a/tests/baselines/reference/classInheritence.js b/tests/baselines/reference/classInheritence.js
index e6e7a1eaf427b..11b0c5e3ae2dc 100644
--- a/tests/baselines/reference/classInheritence.js
+++ b/tests/baselines/reference/classInheritence.js
@@ -11,14 +11,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(A));
diff --git a/tests/baselines/reference/classIsSubtypeOfBaseType.js b/tests/baselines/reference/classIsSubtypeOfBaseType.js
index b51488dbe1e2d..6caa97781dd98 100644
--- a/tests/baselines/reference/classIsSubtypeOfBaseType.js
+++ b/tests/baselines/reference/classIsSubtypeOfBaseType.js
@@ -29,14 +29,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/classOrder2.js b/tests/baselines/reference/classOrder2.js
index ec49320b4be5c..49b2a428e069a 100644
--- a/tests/baselines/reference/classOrder2.js
+++ b/tests/baselines/reference/classOrder2.js
@@ -28,7 +28,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     A.prototype.foo = function () { this.bar(); };
     return A;
diff --git a/tests/baselines/reference/classOrderBug.js b/tests/baselines/reference/classOrderBug.js
index d937197fad534..1381df2797d04 100644
--- a/tests/baselines/reference/classOrderBug.js
+++ b/tests/baselines/reference/classOrderBug.js
@@ -35,7 +35,8 @@ var baz = (function () {
 var foo = (function (_super) {
     __extends(foo, _super);
     function foo() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return foo;
 }(baz));
diff --git a/tests/baselines/reference/classSideInheritance1.js b/tests/baselines/reference/classSideInheritance1.js
index 0e3897a4f466c..7898ae8a2b2e8 100644
--- a/tests/baselines/reference/classSideInheritance1.js
+++ b/tests/baselines/reference/classSideInheritance1.js
@@ -33,7 +33,8 @@ var A = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classSideInheritance2.js b/tests/baselines/reference/classSideInheritance2.js
index 72fd4af1eedac..c5c506d1af681 100644
--- a/tests/baselines/reference/classSideInheritance2.js
+++ b/tests/baselines/reference/classSideInheritance2.js
@@ -29,7 +29,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var SubText = (function (_super) {
     __extends(SubText, _super);
     function SubText(text, span) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return SubText;
 }(TextBase));
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index b708489c518fb..d9e4c3f148208 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -33,7 +33,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x, data) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.data = data;
     }
     return B;
@@ -41,7 +42,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index 581575d0d468b..7b13fa1bf4c48 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -157,7 +157,8 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.p1 = 0;
     }
     return E;
@@ -165,34 +166,38 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
+        var _this;
     } // ERROR - super call required
     return F;
 }(E));
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.p1 = 0;
     } // NO ERROR
     return G;
 }(D));
 var H = (function () {
     function H() {
-        _super.call(this);
+        _this = _super.call(this) || this;
     } // ERROR - no super call allowed
     return H;
 }());
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     } // ERROR - no super call allowed
     return I;
 }(Object));
 var J = (function (_super) {
     __extends(J, _super);
     function J(p1) {
-        _super.call(this); // NO ERROR
+        var _this;
+        _this = _super.call(this) || this; // NO ERROR
         this.p1 = p1;
     }
     return J;
@@ -200,16 +205,18 @@ var J = (function (_super) {
 var K = (function (_super) {
     __extends(K, _super);
     function K(p1) {
+        var _this;
         this.p1 = p1;
         var i = 0;
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return K;
 }(G));
 var L = (function (_super) {
     __extends(L, _super);
     function L(p1) {
-        _super.call(this); // NO ERROR
+        var _this;
+        _this = _super.call(this) || this; // NO ERROR
         this.p1 = p1;
     }
     return L;
@@ -217,9 +224,10 @@ var L = (function (_super) {
 var M = (function (_super) {
     __extends(M, _super);
     function M(p1) {
+        var _this;
         this.p1 = p1;
         var i = 0;
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return M;
 }(G));
diff --git a/tests/baselines/reference/classWithBaseClassButNoConstructor.js b/tests/baselines/reference/classWithBaseClassButNoConstructor.js
index e94a47005068c..6ff5ae2ac5b2c 100644
--- a/tests/baselines/reference/classWithBaseClassButNoConstructor.js
+++ b/tests/baselines/reference/classWithBaseClassButNoConstructor.js
@@ -54,7 +54,8 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(Base));
@@ -69,7 +70,8 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(Base2));
@@ -80,7 +82,8 @@ var d2 = new D(1); // ok
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(Base2));
@@ -90,7 +93,8 @@ var d4 = new D(1); // ok
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D3;
 }(Base2));
diff --git a/tests/baselines/reference/classWithConstructors.js b/tests/baselines/reference/classWithConstructors.js
index 04dcfa2325c20..6bb9387f67388 100644
--- a/tests/baselines/reference/classWithConstructors.js
+++ b/tests/baselines/reference/classWithConstructors.js
@@ -75,7 +75,8 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C2));
@@ -103,7 +104,8 @@ var Generics;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C2));
diff --git a/tests/baselines/reference/classWithProtectedProperty.js b/tests/baselines/reference/classWithProtectedProperty.js
index 2b2e01e59df10..fb07eb3d0b232 100644
--- a/tests/baselines/reference/classWithProtectedProperty.js
+++ b/tests/baselines/reference/classWithProtectedProperty.js
@@ -48,7 +48,8 @@ C.g = function () { return ''; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.method = function () {
         // No errors
diff --git a/tests/baselines/reference/classWithStaticMembers.js b/tests/baselines/reference/classWithStaticMembers.js
index 327adead6b89e..cd23c22023172 100644
--- a/tests/baselines/reference/classWithStaticMembers.js
+++ b/tests/baselines/reference/classWithStaticMembers.js
@@ -45,7 +45,8 @@ var r3 = r.foo;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/classdecl.js b/tests/baselines/reference/classdecl.js
index a8a440fa17d2a..d4f6bb11ca9ba 100644
--- a/tests/baselines/reference/classdecl.js
+++ b/tests/baselines/reference/classdecl.js
@@ -136,7 +136,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
@@ -161,7 +162,8 @@ var m2;
         var c = (function (_super) {
             __extends(c, _super);
             function c() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return c;
         }(b));
@@ -177,7 +179,8 @@ var m2;
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return c;
 }(m1.b));
diff --git a/tests/baselines/reference/clodulesDerivedClasses.js b/tests/baselines/reference/clodulesDerivedClasses.js
index 7e6f26ad59103..dbbbe340ba7b5 100644
--- a/tests/baselines/reference/clodulesDerivedClasses.js
+++ b/tests/baselines/reference/clodulesDerivedClasses.js
@@ -44,7 +44,8 @@ var Shape;
 var Path = (function (_super) {
     __extends(Path, _super);
     function Path() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Path;
 }(Shape));
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
index fc64a8012eeb9..eaf031c2571c6 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
@@ -68,7 +68,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b.prototype, "prop2", {
         get: function () {
@@ -88,7 +89,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(c.prototype, "prop2", {
         get: function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
index b6e7cb121d67e..b961b8fa4a5fa 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
@@ -42,7 +42,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         function _super() {
         }
     }
@@ -51,7 +52,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var x = function () {
             function _super() {
             }
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
index 14b8bf4669706..14965b53abdfe 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
@@ -50,7 +50,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.foo = function () {
         function _super() {
@@ -63,7 +64,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     c.prototype.foo = function () {
         var x = function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
index 2af7a6a870e8c..da4175fe5c711 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
@@ -40,7 +40,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.prop2 = {
             doStuff: function () {
                 function _super() {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js b/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
index 6887a22ae204d..55db3a5e62536 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
@@ -58,7 +58,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b.prototype, "prop2", {
         get: function () {
@@ -76,7 +77,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(c.prototype, "prop2", {
         get: function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
index d3b5e7a20306f..b3ef300076262 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
@@ -36,7 +36,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var _super = 10; // Should be error 
     }
     return b;
@@ -44,7 +45,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var x = function () {
             var _super = 10; // Should be error
         };
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js b/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
index 4553608756df1..c5bb6ebcd0163 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
@@ -36,7 +36,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.foo = function () {
         var _super = 10; // Should be error 
@@ -46,7 +47,8 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     c.prototype.foo = function () {
         var x = function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
index df5d812cf54d9..598bb5b6e8568 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
@@ -38,7 +38,8 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.prop2 = {
             doStuff: function () {
                 var _super = 10; // Should be error 
diff --git a/tests/baselines/reference/collisionSuperAndNameResolution.js b/tests/baselines/reference/collisionSuperAndNameResolution.js
index 2db90d8b02663..5501b3e2df439 100644
--- a/tests/baselines/reference/collisionSuperAndNameResolution.js
+++ b/tests/baselines/reference/collisionSuperAndNameResolution.js
@@ -27,7 +27,8 @@ var base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Foo.prototype.x = function () {
         console.log(_super); // Error as this doesnt not resolve to user defined _super
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index 29b5ad3b496ee..9909ca512ce90 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -94,7 +94,8 @@ var Foo = (function () {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.prop4 = {
             doStuff: function (_super) {
             }
@@ -123,7 +124,8 @@ var Foo2 = (function (_super) {
 var Foo4 = (function (_super) {
     __extends(Foo4, _super);
     function Foo4(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     Foo4.prototype.y = function (_super) {
         var _this = this;
diff --git a/tests/baselines/reference/collisionSuperAndParameter1.js b/tests/baselines/reference/collisionSuperAndParameter1.js
index 517c126ab449f..105fe8497671a 100644
--- a/tests/baselines/reference/collisionSuperAndParameter1.js
+++ b/tests/baselines/reference/collisionSuperAndParameter1.js
@@ -23,7 +23,8 @@ var Foo = (function () {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Foo2.prototype.x = function () {
         var lambda = function (_super) {
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index f94a9fde5f252..6a8dd340a2066 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -44,14 +44,16 @@ var a = (function () {
 var b1 = (function (_super) {
     __extends(b1, _super);
     function b1(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return b1;
 }(a));
 var b2 = (function (_super) {
     __extends(b2, _super);
     function b2(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this._super = _super;
     }
     return b2;
@@ -59,14 +61,16 @@ var b2 = (function (_super) {
 var b3 = (function (_super) {
     __extends(b3, _super);
     function b3(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return b3;
 }(a));
 var b4 = (function (_super) {
     __extends(b4, _super);
     function b4(_super) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this._super = _super;
     }
     return b4;
diff --git a/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js b/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
index c71b0dcf1ddff..59b64e4a9bac4 100644
--- a/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
+++ b/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
@@ -34,7 +34,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.foo = function () {
         var _this = this;
@@ -46,7 +47,8 @@ var b = (function (_super) {
 var b2 = (function (_super) {
     __extends(b2, _super);
     function b2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b2.prototype.foo = function () {
         var _this = this;
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 42df3cca3893b..860c0b90e4839 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -227,7 +227,8 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        _super.call(this, 10);
+        var _this;
+        _this = _super.call(this, 10) || this;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
@@ -258,7 +259,8 @@ c2_i = c3_i;
 var c4 = (function (_super) {
     __extends(c4, _super);
     function c4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return c4;
 }(c2));
diff --git a/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js b/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
index 0de25c1501337..fb7a811cba3e0 100644
--- a/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
+++ b/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
@@ -227,14 +227,16 @@ var Base = (function () {
 var A2 = (function (_super) {
     __extends(A2, _super);
     function A2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A2;
 }(Base));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
index 4185af60dbc9f..675235ae3241c 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
@@ -182,7 +182,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
index 90c67439773a7..ceb386b3e141e 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
@@ -182,7 +182,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
index 736b57e08bacc..03494b4f88d1f 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
@@ -125,7 +125,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
index ca7eea70ad651..ee8185802d4c7 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
@@ -163,7 +163,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
index c64e33827c58e..5a36f91c7ca23 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
@@ -163,7 +163,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
index dc7a12eecdc94..f23588dcbc5d7 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
@@ -273,7 +273,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
index d4be6df98dd05..cc6fe9ce64068 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
@@ -235,7 +235,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
index ee5ad2fbd076c..d401defc2ed60 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
@@ -121,7 +121,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
index 79e4bfd0bbfcb..b4b531b8084cf 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
@@ -178,7 +178,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
index 31c0dd3c7c557..69f46e2ccd207 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
@@ -178,7 +178,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
index 5decd7a21fb09..171f21e77fcfa 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
@@ -92,7 +92,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -114,7 +115,8 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A2));
diff --git a/tests/baselines/reference/complexClassRelationships.js b/tests/baselines/reference/complexClassRelationships.js
index 46974055171c9..523002e5b571e 100644
--- a/tests/baselines/reference/complexClassRelationships.js
+++ b/tests/baselines/reference/complexClassRelationships.js
@@ -57,7 +57,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.createEmpty = function () {
         var item = new Derived();
diff --git a/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js b/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
index 3d885d3eef12c..1201dcf3d3de7 100644
--- a/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
+++ b/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
@@ -14,7 +14,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var S18 = (function (_super) {
     __extends(S18, _super);
     function S18() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return S18;
 }(S18));
diff --git a/tests/baselines/reference/compoundAssignmentLHSIsValue.js b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
index a55c068d4a422..2057d63b38fac 100644
--- a/tests/baselines/reference/compoundAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
@@ -197,7 +197,8 @@ value;
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype. *= value;
         _super.prototype. += value;
     }
diff --git a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
index 16500b823b8f6..ef29163eda65d 100644
--- a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
@@ -139,7 +139,8 @@ _a = Math.pow(['', ''], value), '' = _a[0], '' = _a[1];
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         (_a = _super.prototype). = Math.pow(_a., value);
         var _a;
     }
diff --git a/tests/baselines/reference/computedPropertyNames24_ES5.js b/tests/baselines/reference/computedPropertyNames24_ES5.js
index 24cfe77d93cdf..00186f40a2817 100644
--- a/tests/baselines/reference/computedPropertyNames24_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames24_ES5.js
@@ -25,7 +25,8 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype[_super.bar.call(this)] = function () { };
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames25_ES5.js b/tests/baselines/reference/computedPropertyNames25_ES5.js
index b03dd285ced24..afc0e20eca9e1 100644
--- a/tests/baselines/reference/computedPropertyNames25_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames25_ES5.js
@@ -30,7 +30,8 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () {
         var obj = (_a = {},
diff --git a/tests/baselines/reference/computedPropertyNames26_ES5.js b/tests/baselines/reference/computedPropertyNames26_ES5.js
index 41a20ac6477f3..6b75da57e9af1 100644
--- a/tests/baselines/reference/computedPropertyNames26_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames26_ES5.js
@@ -27,7 +27,8 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype[(_a = {}, _a[_super.bar.call(this)] = 1, _a)[0]] = function () { };
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames27_ES5.js b/tests/baselines/reference/computedPropertyNames27_ES5.js
index bdef47165b19f..3c89ecd50c068 100644
--- a/tests/baselines/reference/computedPropertyNames27_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames27_ES5.js
@@ -19,8 +19,9 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
-    C.prototype[(_super.call(this), "prop")] = function () { };
+    C.prototype[(_this = _super.call(this) || this, "prop")] = function () { };
     return C;
 }(Base));
diff --git a/tests/baselines/reference/computedPropertyNames28_ES5.js b/tests/baselines/reference/computedPropertyNames28_ES5.js
index ed15bbf0145cf..aaac258504cdc 100644
--- a/tests/baselines/reference/computedPropertyNames28_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames28_ES5.js
@@ -24,9 +24,10 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var obj = (_a = {},
-            _a[(_super.call(this), "prop")] = function () { },
+            _a[(_this = _super.call(this) || this, "prop")] = function () { },
             _a);
         var _a;
     }
diff --git a/tests/baselines/reference/computedPropertyNames30_ES5.js b/tests/baselines/reference/computedPropertyNames30_ES5.js
index a900fd44c677e..c31d873ffb942 100644
--- a/tests/baselines/reference/computedPropertyNames30_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames30_ES5.js
@@ -29,13 +29,14 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         (function () {
             var obj = (_a = {},
                 // Ideally, we would capture this. But the reference is
                 // illegal, and not capturing this is consistent with
                 //treatment of other similar violations.
-                _a[(_super.call(this), "prop")] = function () { },
+                _a[(_this = _super.call(_this) || _this, "prop")] = function () { },
                 _a);
             var _a;
         });
diff --git a/tests/baselines/reference/computedPropertyNames31_ES5.js b/tests/baselines/reference/computedPropertyNames31_ES5.js
index 2e38e2a131f14..7b803e9c98793 100644
--- a/tests/baselines/reference/computedPropertyNames31_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames31_ES5.js
@@ -32,7 +32,8 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () {
         var _this = this;
diff --git a/tests/baselines/reference/computedPropertyNames43_ES5.js b/tests/baselines/reference/computedPropertyNames43_ES5.js
index c79a4d8d6d10a..293d017734ec3 100644
--- a/tests/baselines/reference/computedPropertyNames43_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames43_ES5.js
@@ -36,7 +36,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(D.prototype, "get1", {
         // Computed properties
diff --git a/tests/baselines/reference/computedPropertyNames44_ES5.js b/tests/baselines/reference/computedPropertyNames44_ES5.js
index 78e20a7d6a3d4..c990298c4ac76 100644
--- a/tests/baselines/reference/computedPropertyNames44_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames44_ES5.js
@@ -40,7 +40,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(D.prototype, "set1", {
         set: function (p) { },
diff --git a/tests/baselines/reference/computedPropertyNames45_ES5.js b/tests/baselines/reference/computedPropertyNames45_ES5.js
index 9c7482a471393..f5a31fffabbf8 100644
--- a/tests/baselines/reference/computedPropertyNames45_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames45_ES5.js
@@ -41,7 +41,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(D.prototype, "set1", {
         set: function (p) { },
diff --git a/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js b/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
index 3514965f1cebc..a6d00d847f32a 100644
--- a/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
+++ b/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
@@ -63,7 +63,8 @@ var X = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(X));
@@ -71,7 +72,8 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(X));
diff --git a/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js b/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
index 8780c92fc1e80..58b050c5ebeef 100644
--- a/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
+++ b/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
@@ -39,7 +39,8 @@ var X = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(X));
@@ -47,7 +48,8 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(X));
diff --git a/tests/baselines/reference/constantOverloadFunction.js b/tests/baselines/reference/constantOverloadFunction.js
index 09ff39f582e0b..934c7eceb0e5b 100644
--- a/tests/baselines/reference/constantOverloadFunction.js
+++ b/tests/baselines/reference/constantOverloadFunction.js
@@ -28,7 +28,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -36,7 +37,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -44,7 +46,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js b/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
index 37c1b1737cd99..217cf23f9cb62 100644
--- a/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
+++ b/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
@@ -29,7 +29,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -37,7 +38,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -45,7 +47,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js b/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
index 4fd63cf60d0d8..511c293d41736 100644
--- a/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
+++ b/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
@@ -40,7 +40,8 @@ var GenericBase = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(GenericBase));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
index 88f35f53b175d..0e14e958b284c 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
@@ -84,21 +84,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
index 96318a0d61604..cb2cadb76987d 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
@@ -129,21 +129,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
index 171c4bc6210fe..25c6983911784 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
@@ -74,21 +74,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
index 26757c43defce..dcd972d3a971b 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
@@ -64,21 +64,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
index ae1d0d904454b..69fdebe8f5cf4 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
@@ -67,21 +67,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructorArgs.js b/tests/baselines/reference/constructorArgs.js
index 1d533506e1531..3345708ddaa9c 100644
--- a/tests/baselines/reference/constructorArgs.js
+++ b/tests/baselines/reference/constructorArgs.js
@@ -29,7 +29,8 @@ var Super = (function () {
 var Sub = (function (_super) {
     __extends(Sub, _super);
     function Sub(options) {
-        _super.call(this, options.value);
+        var _this;
+        _this = _super.call(this, options.value) || this;
         this.options = options;
     }
     return Sub;
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
index d06faa80f2004..b16721d0accf3 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
@@ -33,14 +33,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index 1c3d6bf16d0f4..a235e2555f3b0 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -47,7 +47,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
     }
     return Derived;
 }(Base));
@@ -55,7 +56,8 @@ var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     // ok, not enforcing assignability relation on this
     function Derived2(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         return 1;
     }
     return Derived2;
diff --git a/tests/baselines/reference/constructorHasPrototypeProperty.js b/tests/baselines/reference/constructorHasPrototypeProperty.js
index 960b76f52c446..956e8cd2e0d2e 100644
--- a/tests/baselines/reference/constructorHasPrototypeProperty.js
+++ b/tests/baselines/reference/constructorHasPrototypeProperty.js
@@ -47,7 +47,8 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
@@ -66,7 +67,8 @@ var Generic;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/constructorOverloads2.js b/tests/baselines/reference/constructorOverloads2.js
index 76481ec1bc691..a0ed6d890d4f8 100644
--- a/tests/baselines/reference/constructorOverloads2.js
+++ b/tests/baselines/reference/constructorOverloads2.js
@@ -40,7 +40,8 @@ var FooBase = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/constructorOverloads3.js b/tests/baselines/reference/constructorOverloads3.js
index 61f0d50db03af..7bc7989f7a316 100644
--- a/tests/baselines/reference/constructorOverloads3.js
+++ b/tests/baselines/reference/constructorOverloads3.js
@@ -31,6 +31,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
+        var _this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
index 905c12e07e34b..1b91e8a131a90 100644
--- a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
+++ b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
@@ -525,7 +525,8 @@ method2();
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.method2 = function () {
         return this.method1(2);
diff --git a/tests/baselines/reference/contextualTypingArrayOfLambdas.js b/tests/baselines/reference/contextualTypingArrayOfLambdas.js
index 5775e0f064dbf..365e17afc9b5e 100644
--- a/tests/baselines/reference/contextualTypingArrayOfLambdas.js
+++ b/tests/baselines/reference/contextualTypingArrayOfLambdas.js
@@ -28,14 +28,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/contextualTypingOfConditionalExpression.js b/tests/baselines/reference/contextualTypingOfConditionalExpression.js
index 29bb48e797069..7be8079cfd9f2 100644
--- a/tests/baselines/reference/contextualTypingOfConditionalExpression.js
+++ b/tests/baselines/reference/contextualTypingOfConditionalExpression.js
@@ -29,14 +29,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/contextualTypingOfConditionalExpression2.js b/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
index 1d84d74e5902e..102562a841ae5 100644
--- a/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
+++ b/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
@@ -26,14 +26,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js b/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
index c385eff83d5e7..5fafe95c1a8f6 100644
--- a/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
+++ b/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
@@ -25,7 +25,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declFileClassExtendsNull.js b/tests/baselines/reference/declFileClassExtendsNull.js
index e9081acab55ed..58bff801774b1 100644
--- a/tests/baselines/reference/declFileClassExtendsNull.js
+++ b/tests/baselines/reference/declFileClassExtendsNull.js
@@ -12,7 +12,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ExtendsNull = (function (_super) {
     __extends(ExtendsNull, _super);
     function ExtendsNull() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ExtendsNull;
 }(null));
diff --git a/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js b/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
index 4b9535cd2c340..d58dcd1f536f4 100644
--- a/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
+++ b/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
@@ -23,7 +23,8 @@ var X = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(X));
diff --git a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
index 117bb6a7bd5d9..2f68300a4bf8c 100644
--- a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
+++ b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
@@ -26,7 +26,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/declFileGenericType.js b/tests/baselines/reference/declFileGenericType.js
index 0974f9d7b3692..2ed404342d733 100644
--- a/tests/baselines/reference/declFileGenericType.js
+++ b/tests/baselines/reference/declFileGenericType.js
@@ -91,7 +91,8 @@ exports.g = C.F5();
 var h = (function (_super) {
     __extends(h, _super);
     function h() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return h;
 }(C.A));
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index a4636d829939e..4ccc090f4f240 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -58,7 +58,8 @@ var templa;
             var AbstractElementController = (function (_super) {
                 __extends(AbstractElementController, _super);
                 function AbstractElementController() {
-                    _super.call(this);
+                    var _this;
+                    _this = _super.call(this) || this;
                 }
                 return AbstractElementController;
             }(templa.mvc.AbstractController));
@@ -78,7 +79,8 @@ var templa;
                 var AbstractCompositeElementController = (function (_super) {
                     __extends(AbstractCompositeElementController, _super);
                     function AbstractCompositeElementController() {
-                        _super.call(this);
+                        var _this;
+                        _this = _super.call(this) || this;
                         this._controllers = [];
                     }
                     return AbstractCompositeElementController;
diff --git a/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js b/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
index 4ac08f97a527c..c9c569f86762c 100644
--- a/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
+++ b/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
@@ -35,7 +35,8 @@ var X;
             var W = (function (_super) {
                 __extends(W, _super);
                 function W() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return W;
             }(A.B.Base.W));
@@ -54,7 +55,8 @@ var X;
                 var W = (function (_super) {
                     __extends(W, _super);
                     function W() {
-                        _super.apply(this, arguments);
+                        var _this = _super.apply(this, arguments) || this;
+                        return _this;
                     }
                     return W;
                 }(X.Y.base.W));
diff --git a/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js b/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
index 6dfce6e8e6334..3681f9fa859ee 100644
--- a/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
+++ b/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
@@ -45,7 +45,8 @@ var A;
             var ContextMenu = (function (_super) {
                 __extends(ContextMenu, _super);
                 function ContextMenu() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return ContextMenu;
             }(B.EventManager));
diff --git a/tests/baselines/reference/declarationEmitThisPredicates01.js b/tests/baselines/reference/declarationEmitThisPredicates01.js
index d05b5c46dad09..0b364e90e45b7 100644
--- a/tests/baselines/reference/declarationEmitThisPredicates01.js
+++ b/tests/baselines/reference/declarationEmitThisPredicates01.js
@@ -28,7 +28,8 @@ exports.C = C;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js b/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
index e34dcc9810fc4..aea36311add1d 100644
--- a/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
+++ b/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
@@ -28,7 +28,8 @@ exports.C = C;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declarationEmit_expressionInExtends.js b/tests/baselines/reference/declarationEmit_expressionInExtends.js
index 061042aa34b5f..9fbb3a4bf6394 100644
--- a/tests/baselines/reference/declarationEmit_expressionInExtends.js
+++ b/tests/baselines/reference/declarationEmit_expressionInExtends.js
@@ -29,7 +29,8 @@ var Q = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(x));
diff --git a/tests/baselines/reference/declarationEmit_expressionInExtends2.js b/tests/baselines/reference/declarationEmit_expressionInExtends2.js
index da0478e26d053..d74f9361e282f 100644
--- a/tests/baselines/reference/declarationEmit_expressionInExtends2.js
+++ b/tests/baselines/reference/declarationEmit_expressionInExtends2.js
@@ -29,7 +29,8 @@ function getClass(c) {
 var MyClass = (function (_super) {
     __extends(MyClass, _super);
     function MyClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyClass;
 }(getClass(2)));
diff --git a/tests/baselines/reference/declarationEmit_expressionInExtends3.js b/tests/baselines/reference/declarationEmit_expressionInExtends3.js
index 10ef42d68388d..5b7754dff64bb 100644
--- a/tests/baselines/reference/declarationEmit_expressionInExtends3.js
+++ b/tests/baselines/reference/declarationEmit_expressionInExtends3.js
@@ -70,7 +70,8 @@ function getExportedClass(c) {
 var MyClass = (function (_super) {
     __extends(MyClass, _super);
     function MyClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyClass;
 }(getLocalClass(undefined)));
@@ -78,7 +79,8 @@ exports.MyClass = MyClass;
 var MyClass2 = (function (_super) {
     __extends(MyClass2, _super);
     function MyClass2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyClass2;
 }(getExportedClass(undefined)));
@@ -86,7 +88,8 @@ exports.MyClass2 = MyClass2;
 var MyClass3 = (function (_super) {
     __extends(MyClass3, _super);
     function MyClass3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyClass3;
 }(getExportedClass(undefined)));
@@ -94,7 +97,8 @@ exports.MyClass3 = MyClass3;
 var MyClass4 = (function (_super) {
     __extends(MyClass4, _super);
     function MyClass4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyClass4;
 }(getExportedClass(undefined)));
diff --git a/tests/baselines/reference/declarationEmit_expressionInExtends4.js b/tests/baselines/reference/declarationEmit_expressionInExtends4.js
index 39ee7ce1e6909..d304422f03853 100644
--- a/tests/baselines/reference/declarationEmit_expressionInExtends4.js
+++ b/tests/baselines/reference/declarationEmit_expressionInExtends4.js
@@ -33,21 +33,24 @@ function getSomething() {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(getSomething()));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(SomeUndefinedFunction()));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C3;
 }(SomeUndefinedFunction));
diff --git a/tests/baselines/reference/declarationEmit_nameConflicts3.js b/tests/baselines/reference/declarationEmit_nameConflicts3.js
index f1ea96973b80e..81236200ade93 100644
--- a/tests/baselines/reference/declarationEmit_nameConflicts3.js
+++ b/tests/baselines/reference/declarationEmit_nameConflicts3.js
@@ -64,7 +64,8 @@ var M;
         var E = (function (_super) {
             __extends(E, _super);
             function E() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return E;
         }(C));
diff --git a/tests/baselines/reference/declarationEmit_protectedMembers.js b/tests/baselines/reference/declarationEmit_protectedMembers.js
index 192f0647ed6df..e118e164dfce4 100644
--- a/tests/baselines/reference/declarationEmit_protectedMembers.js
+++ b/tests/baselines/reference/declarationEmit_protectedMembers.js
@@ -88,7 +88,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C2.prototype.f = function () {
         return _super.prototype.f.call(this) + this.x;
@@ -102,7 +103,8 @@ var C2 = (function (_super) {
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C3.prototype.f = function () {
         return _super.prototype.f.call(this);
diff --git a/tests/baselines/reference/declareDottedExtend.js b/tests/baselines/reference/declareDottedExtend.js
index f1e9ea0b4deb0..f167928087d05 100644
--- a/tests/baselines/reference/declareDottedExtend.js
+++ b/tests/baselines/reference/declareDottedExtend.js
@@ -21,14 +21,16 @@ var ab = A.B;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(ab.C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(A.B.C));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor2.js b/tests/baselines/reference/decoratorOnClassConstructor2.js
index 5fc5501c32986..d50912fbeac59 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor2.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor2.js
@@ -45,7 +45,8 @@ var _0_ts_2 = require("./0.ts");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return C;
 }(_0_ts_1.base));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor3.js b/tests/baselines/reference/decoratorOnClassConstructor3.js
index 66946fab8bd6a..6f37ad9dea146 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor3.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor3.js
@@ -48,7 +48,8 @@ var _0_2 = require("./0");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return C;
 }(_0_1.base));
diff --git a/tests/baselines/reference/decoratorOnClassMethod12.js b/tests/baselines/reference/decoratorOnClassMethod12.js
index 6e9b9763a3ab9..6d95c696176ed 100644
--- a/tests/baselines/reference/decoratorOnClassMethod12.js
+++ b/tests/baselines/reference/decoratorOnClassMethod12.js
@@ -32,7 +32,8 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         C.prototype.method = function () { };
         return C;
diff --git a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
index 2e6ac2c793482..75901c708b35e 100644
--- a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
+++ b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
@@ -47,6 +47,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
+        var _this;
     }
     return Derived;
 }(Base));
@@ -58,21 +59,24 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var r2 = function () { return _super.call(this); }; // error for misplaced super call (nested function)
+        var _this;
+        var r2 = function () { return _this = _super.call(_this) || _this; }; // error for misplaced super call (nested function)
     }
     return Derived2;
 }(Base2));
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var r = function () { _super.call(this); }; // error
+        var _this;
+        var r = function () { _this = _super.call(this) || this; }; // error
     }
     return Derived3;
 }(Base2));
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4() {
-        var r = _super.call(this); // ok
+        var _this;
+        var r = _this = _super.call(this) || this; // ok
     }
     return Derived4;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js b/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
index 7dbb901362f97..6dcf8f3fd8358 100644
--- a/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
+++ b/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
@@ -38,7 +38,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.x = function () {
         return 1;
diff --git a/tests/baselines/reference/derivedClassIncludesInheritedMembers.js b/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
index 0c7a21232e61c..2fe5906e74629 100644
--- a/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
+++ b/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
@@ -68,7 +68,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -89,7 +90,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js b/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
index a44d4340b8f35..dc63ccb21d8ab 100644
--- a/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
+++ b/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
@@ -32,7 +32,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -45,7 +46,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
index c81c6f048f51f..605ad6afa454d 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
@@ -32,7 +32,8 @@ var BaseClass = (function () {
 var DerivedClass = (function (_super) {
     __extends(DerivedClass, _super);
     function DerivedClass() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     DerivedClass.prototype._init = function () {
     };
diff --git a/tests/baselines/reference/derivedClassOverridesPrivates.js b/tests/baselines/reference/derivedClassOverridesPrivates.js
index cd486152c1c78..7ab70d93ff281 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivates.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivates.js
@@ -29,7 +29,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -41,7 +42,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
index 5b8af9e85bfe1..d3e3fe5d4c9ab 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
@@ -66,7 +66,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index 5c7d73d5dfd1a..1f43469596a7a 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -94,7 +94,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
@@ -131,7 +132,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
index ebb675a26db2e..d678f5ce59f8a 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
@@ -103,14 +103,16 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Derived2.prototype.b = function (a) { };
     return Derived2;
@@ -118,7 +120,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Object.defineProperty(Derived3.prototype, "c", {
         get: function () { return x; },
@@ -130,7 +133,8 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Object.defineProperty(Derived4.prototype, "c", {
         set: function (v) { },
@@ -142,21 +146,24 @@ var Derived4 = (function (_super) {
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     return Derived5;
 }(Base));
 var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     return Derived6;
 }(Base));
 var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Derived7.s = function (a) { };
     return Derived7;
@@ -164,7 +171,8 @@ var Derived7 = (function (_super) {
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Object.defineProperty(Derived8, "t", {
         get: function () { return x; },
@@ -176,7 +184,8 @@ var Derived8 = (function (_super) {
 var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     Object.defineProperty(Derived9, "t", {
         set: function (v) { },
@@ -188,7 +197,8 @@ var Derived9 = (function (_super) {
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(a) {
-        _super.call(this, a);
+        var _this;
+        _this = _super.call(this, a) || this;
     }
     return Derived10;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
index b8a15ee8b6c8f..eeaf80061af82 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
@@ -30,14 +30,16 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived1));
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index b62f0d8f7d372..7839398551dc9 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -92,7 +92,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
@@ -129,7 +130,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js b/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
index 147e6edbbb4e6..f2d8f72edfb7d 100644
--- a/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
+++ b/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
@@ -37,7 +37,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -49,7 +50,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassParameterProperties.js b/tests/baselines/reference/derivedClassParameterProperties.js
index 8e5fa82cf0f24..f7afd6529c0a1 100644
--- a/tests/baselines/reference/derivedClassParameterProperties.js
+++ b/tests/baselines/reference/derivedClassParameterProperties.js
@@ -109,24 +109,27 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(y) {
+        var _this;
         var a = 1;
-        _super.call(this); // ok
+        _this = _super.call(this) || this; // ok
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(y) {
+        var _this;
         this.y = y;
         var a = 1;
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
     }
     return Derived2;
 }(Base));
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(y) {
-        _super.call(this); // ok
+        var _this;
+        _this = _super.call(this) || this; // ok
         this.y = y;
         var a = 1;
     }
@@ -135,16 +138,18 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(y) {
+        var _this;
         this.a = 1;
         var b = 2;
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
     }
     return Derived4;
 }(Base));
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(y) {
-        _super.call(this); // ok
+        var _this;
+        _this = _super.call(this) || this; // ok
         this.a = 1;
         var b = 2;
     }
@@ -153,26 +158,29 @@ var Derived5 = (function (_super) {
 var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(y) {
+        var _this;
         this.a = 1;
         var b = 2;
-        _super.call(this); // error: "super" has to be called before "this" accessing
+        _this = _super.call(this) || this; // error: "super" has to be called before "this" accessing
     }
     return Derived6;
 }(Base));
 var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(y) {
+        var _this;
         this.a = 1;
         this.a = 3;
         this.b = 3;
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
     }
     return Derived7;
 }(Base));
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(y) {
-        _super.call(this); // ok
+        var _this;
+        _this = _super.call(this) || this; // ok
         this.a = 1;
         this.a = 3;
         this.b = 3;
@@ -188,17 +196,19 @@ var Base2 = (function () {
 var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(y) {
+        var _this;
         this.a = 1;
         this.a = 3;
         this.b = 3;
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
     }
     return Derived9;
 }(Base2));
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(y) {
-        _super.call(this); // ok
+        var _this;
+        _this = _super.call(this) || this; // ok
         this.a = 1;
         this.a = 3;
         this.b = 3;
diff --git a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
index 50408d3bee764..ad2dc22debf54 100644
--- a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
+++ b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
@@ -46,37 +46,38 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
-        this.a = _super.call(this);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
+        this.a = _this = _super.call(this) || this;
     }
     Derived.prototype.b = function () {
-        _super.call(this);
+        _this = _super.call(this) || this;
     };
     Object.defineProperty(Derived.prototype, "C", {
         get: function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
             return 1;
         },
         set: function (v) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         },
         enumerable: true,
         configurable: true
     });
     Derived.b = function () {
-        _super.call(this);
+        _this = _super.call(this) || this;
     };
     Object.defineProperty(Derived, "C", {
         get: function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
             return 1;
         },
         set: function (v) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         },
         enumerable: true,
         configurable: true
     });
     return Derived;
 }(Base));
-Derived.a = _super.call(this);
+Derived.a = _this = _super.call(this) || this;
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index 1c88306bf3add..a464970fe509d 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -42,14 +42,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.call(this, this); // ok
+        var _this;
+        _this = _super.call(this, this) || this; // ok
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        _super.call(this, this); // error
+        var _this;
+        _this = _super.call(this, this) || this; // error
         this.a = a;
     }
     return Derived2;
@@ -57,8 +59,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        var _this = this;
-        _super.call(this, function () { return _this; }); // error
+        var _this;
+        _this = _super.call(this, function () { return _this; }) || this; // error
         this.a = a;
     }
     return Derived3;
@@ -66,7 +68,8 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        _super.call(this, function () { return this; }); // ok
+        var _this;
+        _this = _super.call(this, function () { return this; }) || this; // ok
         this.a = a;
     }
     return Derived4;
diff --git a/tests/baselines/reference/derivedClassTransitivity.js b/tests/baselines/reference/derivedClassTransitivity.js
index 38c465492e68b..0e88d3664c660 100644
--- a/tests/baselines/reference/derivedClassTransitivity.js
+++ b/tests/baselines/reference/derivedClassTransitivity.js
@@ -36,7 +36,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function () { }; // ok to drop parameters
     return D;
@@ -44,7 +45,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function (x) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity2.js b/tests/baselines/reference/derivedClassTransitivity2.js
index 5d08905a60545..5a3f8f3cf57dd 100644
--- a/tests/baselines/reference/derivedClassTransitivity2.js
+++ b/tests/baselines/reference/derivedClassTransitivity2.js
@@ -36,7 +36,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function (x) { }; // ok to drop parameters
     return D;
@@ -44,7 +45,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function (x, y) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity3.js b/tests/baselines/reference/derivedClassTransitivity3.js
index be7e97a8fc599..f6aa6963795a7 100644
--- a/tests/baselines/reference/derivedClassTransitivity3.js
+++ b/tests/baselines/reference/derivedClassTransitivity3.js
@@ -36,7 +36,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function (x) { }; // ok to drop parameters
     return D;
@@ -44,7 +45,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function (x, y) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity4.js b/tests/baselines/reference/derivedClassTransitivity4.js
index 0c70f03218ec5..8d18e311d8879 100644
--- a/tests/baselines/reference/derivedClassTransitivity4.js
+++ b/tests/baselines/reference/derivedClassTransitivity4.js
@@ -36,7 +36,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function () { }; // ok to drop parameters
     return D;
@@ -44,7 +45,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo = function (x) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassWithAny.js b/tests/baselines/reference/derivedClassWithAny.js
index 34af167011d0c..70885570373e5 100644
--- a/tests/baselines/reference/derivedClassWithAny.js
+++ b/tests/baselines/reference/derivedClassWithAny.js
@@ -91,7 +91,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(D.prototype, "X", {
         get: function () {
@@ -119,7 +120,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(E.prototype, "X", {
         get: function () { return ''; },
diff --git a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
index 2c0775efc1930..24d43468dcf81 100644
--- a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
+++ b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
@@ -46,7 +46,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
index 540be97d165f8..a6b7710ec6dce 100644
--- a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
+++ b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
@@ -56,7 +56,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
index 93d5b49fcd03d..3da7720b77e79 100644
--- a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
+++ b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
@@ -45,7 +45,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
index b58acc01082d8..57f474affe759 100644
--- a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
+++ b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
@@ -58,7 +58,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
index 479beebbbfeef..84028f1d3f2e5 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
@@ -41,7 +41,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 1;
         this.y = 'hello';
     }
@@ -58,7 +59,8 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 2;
         this.y = null;
     }
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
index 4dc35c5e006e1..6c3ce90d6f0ae 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
@@ -49,7 +49,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 1;
         this.y = 'hello';
     }
@@ -68,7 +69,8 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 2;
         this.y = null;
     }
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
index 3b0a673d37805..295fbac60e192 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
@@ -63,7 +63,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(y, z) {
-        _super.call(this, 2);
+        var _this;
+        _this = _super.call(this, 2) || this;
         this.b = '';
         this.b = y;
     }
@@ -72,7 +73,8 @@ var Derived = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 1;
         this.y = 'hello';
     }
@@ -90,7 +92,8 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D(y, z) {
-        _super.call(this, 2);
+        var _this;
+        _this = _super.call(this, 2) || this;
         this.b = null;
         this.b = y;
     }
@@ -99,7 +102,8 @@ var D = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 2;
         this.y = null;
     }
diff --git a/tests/baselines/reference/derivedClasses.js b/tests/baselines/reference/derivedClasses.js
index b6103940b33b3..27947b4f05f19 100644
--- a/tests/baselines/reference/derivedClasses.js
+++ b/tests/baselines/reference/derivedClasses.js
@@ -39,7 +39,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Red = (function (_super) {
     __extends(Red, _super);
     function Red() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Red.prototype.shade = function () {
         var _this = this;
@@ -58,7 +59,8 @@ var Color = (function () {
 var Blue = (function (_super) {
     __extends(Blue, _super);
     function Blue() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Blue.prototype.shade = function () {
         var _this = this;
diff --git a/tests/baselines/reference/derivedGenericClassWithAny.js b/tests/baselines/reference/derivedGenericClassWithAny.js
index 56daf4b7310d4..e31b18e11e71f 100644
--- a/tests/baselines/reference/derivedGenericClassWithAny.js
+++ b/tests/baselines/reference/derivedGenericClassWithAny.js
@@ -64,7 +64,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(D.prototype, "X", {
         get: function () {
@@ -92,7 +93,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(E.prototype, "X", {
         get: function () { return ''; } // error
diff --git a/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js b/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
index 2e0a561e846e8..4430ad5a31b82 100644
--- a/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
+++ b/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
@@ -34,7 +34,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.foo = function (x) {
         return null;
diff --git a/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js b/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
index cfbe44166c94e..f6415d8496553 100644
--- a/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
+++ b/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
@@ -39,7 +39,8 @@ var Derived = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/destructuringParameterDeclaration5.js b/tests/baselines/reference/destructuringParameterDeclaration5.js
index 2df6ce46b2c6b..a1f109ed49ea2 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration5.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration5.js
@@ -65,7 +65,8 @@ var Class = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return SubClass;
 }(Class));
@@ -77,7 +78,8 @@ var D = (function () {
 var SubD = (function (_super) {
     __extends(SubD, _super);
     function SubD() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return SubD;
 }(D));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
index 88ce3f1418b29..4e07d5c8655b7 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
@@ -28,9 +28,10 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
+        var _this;
         "use strict";
         'someStringForEgngInject';
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.x = x;
     }
     return B;
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
index 920ad1f7bdacb..b6eabb2a418a7 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
@@ -30,9 +30,10 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         "use strict";
         'someStringForEgngInject';
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.blub = 12;
     }
     return B;
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
index 3fa18140034df..0e866e98f4670 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
@@ -28,9 +28,10 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
+        var _this;
         "use strict";
         'someStringForEgngInject';
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.x = x;
         this.blah = 2;
     }
diff --git a/tests/baselines/reference/emitThisInSuperMethodCall.js b/tests/baselines/reference/emitThisInSuperMethodCall.js
index 1350ed9d4c86e..4bb83a7c172a2 100644
--- a/tests/baselines/reference/emitThisInSuperMethodCall.js
+++ b/tests/baselines/reference/emitThisInSuperMethodCall.js
@@ -43,7 +43,8 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     RegisteredUser.prototype.f = function () {
         (function () {
diff --git a/tests/baselines/reference/emptyModuleName.js b/tests/baselines/reference/emptyModuleName.js
index 5c85d39e1ec20..2292f0a494ae9 100644
--- a/tests/baselines/reference/emptyModuleName.js
+++ b/tests/baselines/reference/emptyModuleName.js
@@ -14,7 +14,8 @@ var A = require("");
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js b/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
index 96f6c65b85c7b..7b05688b8c8de 100644
--- a/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
+++ b/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
@@ -30,7 +30,8 @@ var base = (function () {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return derived;
 }(base));
diff --git a/tests/baselines/reference/errorSuperCalls.js b/tests/baselines/reference/errorSuperCalls.js
index 3e778535bb71b..765fdf083b53c 100644
--- a/tests/baselines/reference/errorSuperCalls.js
+++ b/tests/baselines/reference/errorSuperCalls.js
@@ -83,38 +83,38 @@ var __extends = (this && this.__extends) || function (d, b) {
 //super call in class constructor with no base type
 var NoBase = (function () {
     function NoBase() {
-        _super.call(this);
+        _this = _super.call(this) || this;
         //super call in class member initializer with no base type
-        this.p = _super.call(this);
+        this.p = _this = _super.call(this) || this;
     }
     //super call in class member function with no base type
     NoBase.prototype.fn = function () {
-        _super.call(this);
+        _this = _super.call(this) || this;
     };
     Object.defineProperty(NoBase.prototype, "foo", {
         //super call in class accessor (get and set) with no base type
         get: function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
             return null;
         },
         set: function (v) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         },
         enumerable: true,
         configurable: true
     });
     //super call in static class member function with no base type
     NoBase.fn = function () {
-        _super.call(this);
+        _this = _super.call(this) || this;
     };
     Object.defineProperty(NoBase, "q", {
         //super call in static class accessor (get and set) with no base type
         get: function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
             return null;
         },
         set: function (n) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         },
         enumerable: true,
         configurable: true
@@ -122,7 +122,7 @@ var NoBase = (function () {
     return NoBase;
 }());
 //super call in static class member initializer with no base type
-NoBase.k = _super.call(this);
+NoBase.k = _this = _super.call(this) || this;
 var Base = (function () {
     function Base() {
     }
@@ -132,8 +132,9 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     //super call with type arguments 
     function Derived() {
+        var _this;
         _super.prototype..call(this);
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return Derived;
 }(Base));
@@ -145,22 +146,23 @@ var OtherBase = (function () {
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         //super call in class member initializer of derived type
-        this.t = _super.call(this);
+        this.t = _this = _super.call(this) || this;
     }
     OtherDerived.prototype.fn = function () {
         //super call in class member function of derived type
-        _super.call(this);
+        _this = _super.call(this) || this;
     };
     Object.defineProperty(OtherDerived.prototype, "foo", {
         //super call in class accessor (get and set) of derived type
         get: function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
             return null;
         },
         set: function (n) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         },
         enumerable: true,
         configurable: true
diff --git a/tests/baselines/reference/errorSuperPropertyAccess.js b/tests/baselines/reference/errorSuperPropertyAccess.js
index dbfbdb4694023..18c98868e937e 100644
--- a/tests/baselines/reference/errorSuperPropertyAccess.js
+++ b/tests/baselines/reference/errorSuperPropertyAccess.js
@@ -186,7 +186,8 @@ SomeBase.publicStaticMember = 0;
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype.publicMember = 1;
     }
     SomeDerived1.prototype.fn = function () {
@@ -219,7 +220,8 @@ var SomeDerived1 = (function (_super) {
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype.privateMember = 1;
     }
     SomeDerived2.prototype.fn = function () {
@@ -245,7 +247,8 @@ var SomeDerived2 = (function (_super) {
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SomeDerived3.fn = function () {
         _super.publicStaticMember = 3;
diff --git a/tests/baselines/reference/errorsInGenericTypeReference.js b/tests/baselines/reference/errorsInGenericTypeReference.js
index a7898810e1075..d3d275ff25b35 100644
--- a/tests/baselines/reference/errorsInGenericTypeReference.js
+++ b/tests/baselines/reference/errorsInGenericTypeReference.js
@@ -135,7 +135,8 @@ var testClass6 = (function () {
 var testClass7 = (function (_super) {
     __extends(testClass7, _super);
     function testClass7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return testClass7;
 }(Foo)); // error: could not find symbol V
diff --git a/tests/baselines/reference/es6ClassSuperCodegenBug.js b/tests/baselines/reference/es6ClassSuperCodegenBug.js
index c32865478e32b..88000a12bbe53 100644
--- a/tests/baselines/reference/es6ClassSuperCodegenBug.js
+++ b/tests/baselines/reference/es6ClassSuperCodegenBug.js
@@ -28,11 +28,12 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         if (true) {
-            _super.call(this, 'a1', 'b1');
+            _this = _super.call(this, 'a1', 'b1') || this;
         }
         else {
-            _super.call(this, 'a2', 'b2');
+            _this = _super.call(this, 'a2', 'b2') || this;
         }
     }
     return B;
diff --git a/tests/baselines/reference/es6ClassTest.js b/tests/baselines/reference/es6ClassTest.js
index a722cce167033..0a6323630fb4b 100644
--- a/tests/baselines/reference/es6ClassTest.js
+++ b/tests/baselines/reference/es6ClassTest.js
@@ -102,8 +102,9 @@ var Bar = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y, z) {
+        var _this;
         if (z === void 0) { z = 0; }
-        _super.call(this, x);
+        _this = _super.call(this, x) || this;
         this.y = y;
         this.z = z;
         this.gar = 0;
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index 1881e6b8c878c..ebf779f7bba71 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -267,7 +267,8 @@ var SuperParent = (function () {
 var SuperChild = (function (_super) {
     __extends(SuperChild, _super);
     function SuperChild() {
-        _super.call(this, 1);
+        var _this;
+        _this = _super.call(this, 1) || this;
     }
     SuperChild.prototype.b = function () {
         _super.prototype.b.call(this, 'str');
@@ -314,7 +315,8 @@ var BaseClassWithConstructor = (function () {
 var ChildClassWithoutConstructor = (function (_super) {
     __extends(ChildClassWithoutConstructor, _super);
     function ChildClassWithoutConstructor() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ChildClassWithoutConstructor;
 }(BaseClassWithConstructor));
diff --git a/tests/baselines/reference/es6ClassTest7.js b/tests/baselines/reference/es6ClassTest7.js
index 14662410a1405..6e30a1d7879e9 100644
--- a/tests/baselines/reference/es6ClassTest7.js
+++ b/tests/baselines/reference/es6ClassTest7.js
@@ -17,7 +17,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar;
 }(M.Foo));
diff --git a/tests/baselines/reference/exportAssignmentOfGenericType1.js b/tests/baselines/reference/exportAssignmentOfGenericType1.js
index 0504bad39c7b0..439f74a9c9d0a 100644
--- a/tests/baselines/reference/exportAssignmentOfGenericType1.js
+++ b/tests/baselines/reference/exportAssignmentOfGenericType1.js
@@ -34,7 +34,8 @@ define(["require", "exports", "exportAssignmentOfGenericType1_0"], function (req
     var M = (function (_super) {
         __extends(M, _super);
         function M() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return M;
     }(q));
diff --git a/tests/baselines/reference/exportDeclarationInInternalModule.js b/tests/baselines/reference/exportDeclarationInInternalModule.js
index a9ea4bf5eda00..b6eec928a071b 100644
--- a/tests/baselines/reference/exportDeclarationInInternalModule.js
+++ b/tests/baselines/reference/exportDeclarationInInternalModule.js
@@ -32,7 +32,8 @@ var Bbb = (function () {
 var Aaa = (function (_super) {
     __extends(Aaa, _super);
     function Aaa() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Aaa;
 }(Bbb));
diff --git a/tests/baselines/reference/extBaseClass1.js b/tests/baselines/reference/extBaseClass1.js
index 446c6df9c94d9..508eea66500a7 100644
--- a/tests/baselines/reference/extBaseClass1.js
+++ b/tests/baselines/reference/extBaseClass1.js
@@ -37,7 +37,8 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C;
     }(B));
@@ -48,7 +49,8 @@ var M;
     var C2 = (function (_super) {
         __extends(C2, _super);
         function C2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C2;
     }(M.B));
@@ -59,7 +61,8 @@ var N;
     var C3 = (function (_super) {
         __extends(C3, _super);
         function C3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C3;
     }(M.B));
diff --git a/tests/baselines/reference/extBaseClass2.js b/tests/baselines/reference/extBaseClass2.js
index f7bd85d685c25..14f3d69ef3eb5 100644
--- a/tests/baselines/reference/extBaseClass2.js
+++ b/tests/baselines/reference/extBaseClass2.js
@@ -21,7 +21,8 @@ var N;
     var C4 = (function (_super) {
         __extends(C4, _super);
         function C4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C4;
     }(M.B));
@@ -32,7 +33,8 @@ var M;
     var C5 = (function (_super) {
         __extends(C5, _super);
         function C5() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C5;
     }(B));
diff --git a/tests/baselines/reference/extendAndImplementTheSameBaseType.js b/tests/baselines/reference/extendAndImplementTheSameBaseType.js
index e52e5b497acce..03bf54db78dba 100644
--- a/tests/baselines/reference/extendAndImplementTheSameBaseType.js
+++ b/tests/baselines/reference/extendAndImplementTheSameBaseType.js
@@ -28,7 +28,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendAndImplementTheSameBaseType2.js b/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
index 1f4f62a42ee82..50db54a05e9ba 100644
--- a/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
+++ b/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
@@ -33,7 +33,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js b/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
index d598389d0fa2a..6cab3a8c7f609 100644
--- a/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
+++ b/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
@@ -12,7 +12,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return derived;
 }(base));
diff --git a/tests/baselines/reference/extendClassExpressionFromModule.js b/tests/baselines/reference/extendClassExpressionFromModule.js
index 6532603b73c50..c0cb5d4902327 100644
--- a/tests/baselines/reference/extendClassExpressionFromModule.js
+++ b/tests/baselines/reference/extendClassExpressionFromModule.js
@@ -31,7 +31,8 @@ var x = foo1;
 var y = (function (_super) {
     __extends(y, _super);
     function y() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return y;
 }(x));
diff --git a/tests/baselines/reference/extendConstructSignatureInInterface.js b/tests/baselines/reference/extendConstructSignatureInInterface.js
index 20f43a948b895..6985657ced311 100644
--- a/tests/baselines/reference/extendConstructSignatureInInterface.js
+++ b/tests/baselines/reference/extendConstructSignatureInInterface.js
@@ -20,7 +20,8 @@ var CStatic;
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(CStatic));
diff --git a/tests/baselines/reference/extendNonClassSymbol1.js b/tests/baselines/reference/extendNonClassSymbol1.js
index 558e6d6ba5773..829b1ae1a3234 100644
--- a/tests/baselines/reference/extendNonClassSymbol1.js
+++ b/tests/baselines/reference/extendNonClassSymbol1.js
@@ -19,7 +19,8 @@ var x = A;
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(x)); // error, could not find symbol xs
diff --git a/tests/baselines/reference/extendNonClassSymbol2.js b/tests/baselines/reference/extendNonClassSymbol2.js
index 3785c7c58469e..9a2d4fb2adf5d 100644
--- a/tests/baselines/reference/extendNonClassSymbol2.js
+++ b/tests/baselines/reference/extendNonClassSymbol2.js
@@ -18,7 +18,8 @@ var x = new Foo(); // legal, considered a constructor function
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(Foo)); // error, could not find symbol Foo
diff --git a/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js b/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
index 6542492e200cf..db2fcdbbf3660 100644
--- a/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
+++ b/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
@@ -51,7 +51,8 @@ var Backbone = require("./extendingClassFromAliasAndUsageInIndexer_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
@@ -67,7 +68,8 @@ var Backbone = require("./extendingClassFromAliasAndUsageInIndexer_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/extendsClauseAlreadySeen.js b/tests/baselines/reference/extendsClauseAlreadySeen.js
index fb9a3f1237858..db11c06d78261 100644
--- a/tests/baselines/reference/extendsClauseAlreadySeen.js
+++ b/tests/baselines/reference/extendsClauseAlreadySeen.js
@@ -20,7 +20,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendsClauseAlreadySeen2.js b/tests/baselines/reference/extendsClauseAlreadySeen2.js
index 9423789dd3538..f61317c2d5061 100644
--- a/tests/baselines/reference/extendsClauseAlreadySeen2.js
+++ b/tests/baselines/reference/extendsClauseAlreadySeen2.js
@@ -20,7 +20,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/fluentClasses.js b/tests/baselines/reference/fluentClasses.js
index 3d5efcc1b1a64..68a2960b03f33 100644
--- a/tests/baselines/reference/fluentClasses.js
+++ b/tests/baselines/reference/fluentClasses.js
@@ -35,7 +35,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () {
         return this;
@@ -45,7 +46,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.baz = function () {
         return this;
diff --git a/tests/baselines/reference/for-inStatements.js b/tests/baselines/reference/for-inStatements.js
index 5c097a68ccc3b..7176a27ebc999 100644
--- a/tests/baselines/reference/for-inStatements.js
+++ b/tests/baselines/reference/for-inStatements.js
@@ -126,7 +126,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.boz = function () {
         for (var x in this.biz()) { }
diff --git a/tests/baselines/reference/for-inStatementsInvalid.js b/tests/baselines/reference/for-inStatementsInvalid.js
index caec9bd1987ce..cca8e94dcab99 100644
--- a/tests/baselines/reference/for-inStatementsInvalid.js
+++ b/tests/baselines/reference/for-inStatementsInvalid.js
@@ -107,7 +107,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.boz = function () {
         for (var x in this.biz()) { }
diff --git a/tests/baselines/reference/forStatementsMultipleInvalidDecl.js b/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
index aff01bc85655a..82910ff043543 100644
--- a/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
+++ b/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
@@ -68,7 +68,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/functionImplementationErrors.js b/tests/baselines/reference/functionImplementationErrors.js
index 2dc6c8a1bc442..465ea54b73f5c 100644
--- a/tests/baselines/reference/functionImplementationErrors.js
+++ b/tests/baselines/reference/functionImplementationErrors.js
@@ -134,14 +134,16 @@ var AnotherClass = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/functionImplementations.js b/tests/baselines/reference/functionImplementations.js
index 6e37f929efef7..e26e49c1b7a24 100644
--- a/tests/baselines/reference/functionImplementations.js
+++ b/tests/baselines/reference/functionImplementations.js
@@ -236,7 +236,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -287,7 +288,8 @@ function f6() {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/functionSubtypingOfVarArgs.js b/tests/baselines/reference/functionSubtypingOfVarArgs.js
index 7485abe192735..c604461f32d1a 100644
--- a/tests/baselines/reference/functionSubtypingOfVarArgs.js
+++ b/tests/baselines/reference/functionSubtypingOfVarArgs.js
@@ -32,7 +32,8 @@ var EventBase = (function () {
 var StringEvent = (function (_super) {
     __extends(StringEvent, _super);
     function StringEvent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     StringEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/functionSubtypingOfVarArgs2.js b/tests/baselines/reference/functionSubtypingOfVarArgs2.js
index 33d0e8c7e03e9..38a98a3f11496 100644
--- a/tests/baselines/reference/functionSubtypingOfVarArgs2.js
+++ b/tests/baselines/reference/functionSubtypingOfVarArgs2.js
@@ -32,7 +32,8 @@ var EventBase = (function () {
 var StringEvent = (function (_super) {
     __extends(StringEvent, _super);
     function StringEvent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     StringEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/generatedContextualTyping.js b/tests/baselines/reference/generatedContextualTyping.js
index e5488121d34eb..5c512883a1064 100644
--- a/tests/baselines/reference/generatedContextualTyping.js
+++ b/tests/baselines/reference/generatedContextualTyping.js
@@ -369,14 +369,16 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericBaseClassLiteralProperty.js b/tests/baselines/reference/genericBaseClassLiteralProperty.js
index 5aa43d78826a6..25dfb7ae72250 100644
--- a/tests/baselines/reference/genericBaseClassLiteralProperty.js
+++ b/tests/baselines/reference/genericBaseClassLiteralProperty.js
@@ -26,7 +26,8 @@ var BaseClass = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubClass.prototype.Error = function () {
         var x = this._getValue1();
diff --git a/tests/baselines/reference/genericBaseClassLiteralProperty2.js b/tests/baselines/reference/genericBaseClassLiteralProperty2.js
index 3226f1cd6595b..e39353b6a7f38 100644
--- a/tests/baselines/reference/genericBaseClassLiteralProperty2.js
+++ b/tests/baselines/reference/genericBaseClassLiteralProperty2.js
@@ -35,7 +35,8 @@ var BaseCollection2 = (function () {
 var DataView2 = (function (_super) {
     __extends(DataView2, _super);
     function DataView2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     DataView2.prototype.fillItems = function (item) {
         this._itemsByKey['dummy'] = item;
diff --git a/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js b/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
index 04d5bd2d99794..53c02a85113f0 100644
--- a/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
+++ b/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
@@ -122,14 +122,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgs2.js b/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
index 509dd9a11360b..3835a4dd78728 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
@@ -46,14 +46,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
index d3f18e0bfcb24..a16f8bcac685e 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
@@ -54,7 +54,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
index acab51690d343..410675804af89 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
@@ -52,14 +52,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericCallbacksAndClassHierarchy.js b/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
index 31b4cd181b97e..3fbb7c8a90117 100644
--- a/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
+++ b/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
@@ -46,7 +46,8 @@ var M;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(C1));
diff --git a/tests/baselines/reference/genericClassExpressionInFunction.js b/tests/baselines/reference/genericClassExpressionInFunction.js
index f334da5262567..d14b70b631291 100644
--- a/tests/baselines/reference/genericClassExpressionInFunction.js
+++ b/tests/baselines/reference/genericClassExpressionInFunction.js
@@ -47,7 +47,8 @@ function B1() {
     return (function (_super) {
         __extends(class_1, _super);
         function class_1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class_1;
     }(A));
@@ -57,7 +58,8 @@ var B2 = (function () {
         this.anon = (function (_super) {
             __extends(class_2, _super);
             function class_2() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return class_2;
         }(A));
@@ -68,7 +70,8 @@ function B3() {
     return (function (_super) {
         __extends(Inner, _super);
         function Inner() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Inner;
     }(A));
@@ -77,14 +80,16 @@ function B3() {
 var K = (function (_super) {
     __extends(K, _super);
     function K() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return K;
 }(B1()));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }((new B2().anon)));
@@ -92,7 +97,8 @@ var b3Number = B3();
 var S = (function (_super) {
     __extends(S, _super);
     function S() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return S;
 }(b3Number));
diff --git a/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js b/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
index 9f71ace88a96c..a6c14b9ba0f65 100644
--- a/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
+++ b/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
@@ -14,14 +14,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(B));
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(C));
diff --git a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
index 8f90c2fb6e437..0cc1f5867a24d 100644
--- a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
+++ b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
@@ -109,7 +109,8 @@ var PortalFx;
                 var Validator = (function (_super) {
                     __extends(Validator, _super);
                     function Validator(message) {
-                        _super.call(this, message);
+                        var _this;
+                        _this = _super.call(this, message) || this;
                     }
                     return Validator;
                 }(Portal.Controls.Validators.Validator));
diff --git a/tests/baselines/reference/genericClassStaticMethod.js b/tests/baselines/reference/genericClassStaticMethod.js
index 394e6650e0a0e..2124f41417265 100644
--- a/tests/baselines/reference/genericClassStaticMethod.js
+++ b/tests/baselines/reference/genericClassStaticMethod.js
@@ -26,7 +26,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Bar.getFoo = function () {
     };
diff --git a/tests/baselines/reference/genericClasses3.js b/tests/baselines/reference/genericClasses3.js
index 2bd33efb3dcfb..6f10b979c4a14 100644
--- a/tests/baselines/reference/genericClasses3.js
+++ b/tests/baselines/reference/genericClasses3.js
@@ -31,7 +31,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
index d2bf12667fc9e..4581ecc31ecca 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
@@ -52,7 +52,8 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                _super.call(this, from);
+                var _this;
+                _this = _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
index f61f57cb6157f..8f1e9c8365fea 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
@@ -51,7 +51,8 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                _super.call(this, from);
+                var _this;
+                _this = _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
index 906145850f15a..454bc77ae5b42 100644
--- a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
+++ b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
@@ -26,7 +26,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
index 1c73075acc4f4..26749718d4366 100644
--- a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
+++ b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
@@ -26,7 +26,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericInheritedDefaultConstructors.js b/tests/baselines/reference/genericInheritedDefaultConstructors.js
index 170ef89abb2c4..e7c32cbe73ff7 100644
--- a/tests/baselines/reference/genericInheritedDefaultConstructors.js
+++ b/tests/baselines/reference/genericInheritedDefaultConstructors.js
@@ -24,7 +24,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericPrototypeProperty2.js b/tests/baselines/reference/genericPrototypeProperty2.js
index 3f1b6e21adc86..ccaf6fa88076d 100644
--- a/tests/baselines/reference/genericPrototypeProperty2.js
+++ b/tests/baselines/reference/genericPrototypeProperty2.js
@@ -29,7 +29,8 @@ var BaseEvent = (function () {
 var MyEvent = (function (_super) {
     __extends(MyEvent, _super);
     function MyEvent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyEvent;
 }(BaseEvent));
@@ -41,7 +42,8 @@ var BaseEventWrapper = (function () {
 var MyEventWrapper = (function (_super) {
     __extends(MyEventWrapper, _super);
     function MyEventWrapper() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyEventWrapper;
 }(BaseEventWrapper));
diff --git a/tests/baselines/reference/genericPrototypeProperty3.js b/tests/baselines/reference/genericPrototypeProperty3.js
index b7cca85561c63..8565859370503 100644
--- a/tests/baselines/reference/genericPrototypeProperty3.js
+++ b/tests/baselines/reference/genericPrototypeProperty3.js
@@ -28,7 +28,8 @@ var BaseEvent = (function () {
 var MyEvent = (function (_super) {
     __extends(MyEvent, _super);
     function MyEvent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyEvent;
 }(BaseEvent));
@@ -40,7 +41,8 @@ var BaseEventWrapper = (function () {
 var MyEventWrapper = (function (_super) {
     __extends(MyEventWrapper, _super);
     function MyEventWrapper() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyEventWrapper;
 }(BaseEventWrapper));
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
index 73012f714e8af..e567e2a8042be 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
@@ -57,7 +57,8 @@ var TypeScript2;
     var PullTypeSymbol = (function (_super) {
         __extends(PullTypeSymbol, _super);
         function PullTypeSymbol() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return PullTypeSymbol;
     }(PullSymbol));
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
index 61cb758c48e76..226fede58b693 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
@@ -59,7 +59,8 @@ var TypeScript;
     var PullTypeSymbol = (function (_super) {
         __extends(PullTypeSymbol, _super);
         function PullTypeSymbol() {
-            _super.apply(this, arguments);
+            var _this;
+            _this = _super.apply(this, arguments) || this;
             this._elementType = null;
         }
         PullTypeSymbol.prototype.toString = function (scopeSymbol, useConstraintInName) {
diff --git a/tests/baselines/reference/genericTypeAssertions2.js b/tests/baselines/reference/genericTypeAssertions2.js
index 02a51aed35de1..31d2b3976db6d 100644
--- a/tests/baselines/reference/genericTypeAssertions2.js
+++ b/tests/baselines/reference/genericTypeAssertions2.js
@@ -28,7 +28,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () {
         return null;
diff --git a/tests/baselines/reference/genericTypeAssertions4.js b/tests/baselines/reference/genericTypeAssertions4.js
index 2c5bbf51d7f89..41a187edb6a12 100644
--- a/tests/baselines/reference/genericTypeAssertions4.js
+++ b/tests/baselines/reference/genericTypeAssertions4.js
@@ -40,7 +40,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () { return 1; };
     return B;
@@ -48,7 +49,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.baz = function () { return 1; };
     return C;
diff --git a/tests/baselines/reference/genericTypeAssertions6.js b/tests/baselines/reference/genericTypeAssertions6.js
index 5bc7a943163d4..b776668f2e2e7 100644
--- a/tests/baselines/reference/genericTypeAssertions6.js
+++ b/tests/baselines/reference/genericTypeAssertions6.js
@@ -44,7 +44,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.g = function (x) {
         var a = x;
diff --git a/tests/baselines/reference/genericTypeConstraints.js b/tests/baselines/reference/genericTypeConstraints.js
index 5f4bb41a83fc9..761220ae11af5 100644
--- a/tests/baselines/reference/genericTypeConstraints.js
+++ b/tests/baselines/reference/genericTypeConstraints.js
@@ -38,7 +38,8 @@ var Bar = (function () {
 var BarExtended = (function (_super) {
     __extends(BarExtended, _super);
     function BarExtended() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return BarExtended;
 }(Bar));
diff --git a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
index 7fe6c49d65efd..39468204a5af1 100644
--- a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
+++ b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
@@ -60,7 +60,8 @@ var g = function f(x) { var y; return y; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -76,7 +77,8 @@ var M;
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(M.E));
diff --git a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
index 12be456a8a829..a41d459b445c4 100644
--- a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
+++ b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
@@ -55,14 +55,16 @@ var g = function f(x) { var y; return y; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(I));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(M.C));
diff --git a/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js b/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
index 1f016b401ede4..c0498b351e13b 100644
--- a/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
+++ b/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
@@ -31,7 +31,8 @@ define(["require", "exports"], function (require, exports) {
     var List = (function (_super) {
         __extends(List, _super);
         function List() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         List.prototype.Bar = function () { };
         return List;
@@ -46,7 +47,8 @@ define(["require", "exports"], function (require, exports) {
     var ListItem = (function (_super) {
         __extends(ListItem, _super);
         function ListItem() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return ListItem;
     }(CollectionItem));
diff --git a/tests/baselines/reference/heterogeneousArrayLiterals.js b/tests/baselines/reference/heterogeneousArrayLiterals.js
index e482f0d33d3c2..e3c50cfa8f7e8 100644
--- a/tests/baselines/reference/heterogeneousArrayLiterals.js
+++ b/tests/baselines/reference/heterogeneousArrayLiterals.js
@@ -160,14 +160,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/ifDoWhileStatements.js b/tests/baselines/reference/ifDoWhileStatements.js
index 75762ffbb54de..af1e3be18ff26 100644
--- a/tests/baselines/reference/ifDoWhileStatements.js
+++ b/tests/baselines/reference/ifDoWhileStatements.js
@@ -177,7 +177,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/illegalSuperCallsInConstructor.js b/tests/baselines/reference/illegalSuperCallsInConstructor.js
index 88671ce1ceeea..e27a9789cb149 100644
--- a/tests/baselines/reference/illegalSuperCallsInConstructor.js
+++ b/tests/baselines/reference/illegalSuperCallsInConstructor.js
@@ -34,16 +34,17 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var r2 = function () { return _super.call(this); };
-        var r3 = function () { _super.call(this); };
-        var r4 = function () { _super.call(this); };
+        var _this;
+        var r2 = function () { return _this = _super.call(_this) || _this; };
+        var r3 = function () { _this = _super.call(_this) || _this; };
+        var r4 = function () { _this = _super.call(this) || this; };
         var r5 = {
             get foo() {
-                _super.call(this);
+                _this = _super.call(this) || this;
                 return 1;
             },
             set foo(v) {
-                _super.call(this);
+                _this = _super.call(this) || this;
             }
         };
     }
diff --git a/tests/baselines/reference/implementClausePrecedingExtends.js b/tests/baselines/reference/implementClausePrecedingExtends.js
index ba3583c3051aa..0dfc867a2f77d 100644
--- a/tests/baselines/reference/implementClausePrecedingExtends.js
+++ b/tests/baselines/reference/implementClausePrecedingExtends.js
@@ -16,7 +16,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
index 8fec5dc27da52..033d615019407 100644
--- a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
+++ b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
@@ -99,21 +99,24 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar;
 }(Foo));
 var Bar2 = (function (_super) {
     __extends(Bar2, _super);
     function Bar2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar2;
 }(Foo));
 var Bar3 = (function (_super) {
     __extends(Bar3, _super);
     function Bar3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar3;
 }(Foo));
@@ -128,28 +131,32 @@ var M;
     var Baz = (function (_super) {
         __extends(Baz, _super);
         function Baz() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Baz;
     }(Foo));
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar;
     }(Foo));
     var Bar2 = (function (_super) {
         __extends(Bar2, _super);
         function Bar2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar2;
     }(Foo));
     var Bar3 = (function (_super) {
         __extends(Bar3, _super);
         function Bar3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar3;
     }(Foo));
@@ -165,14 +172,16 @@ var M2;
     var Baz = (function (_super) {
         __extends(Baz, _super);
         function Baz() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Baz;
     }(Foo));
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar;
     }(Foo));
@@ -183,14 +192,16 @@ var M2;
     var Bar2 = (function (_super) {
         __extends(Bar2, _super);
         function Bar2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar2;
     }(Foo));
     var Bar3 = (function (_super) {
         __extends(Bar3, _super);
         function Bar3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar3;
     }(Foo));
diff --git a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
index 915e652056cc4..78cfb6b51b94e 100644
--- a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
+++ b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
@@ -75,28 +75,32 @@ var Bar4 = (function () {
 var Bar5 = (function (_super) {
     __extends(Bar5, _super);
     function Bar5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar5;
 }(Foo));
 var Bar6 = (function (_super) {
     __extends(Bar6, _super);
     function Bar6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar6;
 }(Foo));
 var Bar7 = (function (_super) {
     __extends(Bar7, _super);
     function Bar7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar7;
 }(Foo));
 var Bar8 = (function (_super) {
     __extends(Bar8, _super);
     function Bar8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar8;
 }(Foo));
diff --git a/tests/baselines/reference/importAsBaseClass.js b/tests/baselines/reference/importAsBaseClass.js
index 60e142dd5f71b..d9f40f83051d6 100644
--- a/tests/baselines/reference/importAsBaseClass.js
+++ b/tests/baselines/reference/importAsBaseClass.js
@@ -30,7 +30,8 @@ var Greeter = require("./importAsBaseClass_0");
 var Hello = (function (_super) {
     __extends(Hello, _super);
     function Hello() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Hello;
 }(Greeter));
diff --git a/tests/baselines/reference/importHelpers.js b/tests/baselines/reference/importHelpers.js
index f850b5cf17727..6641ef9d212f2 100644
--- a/tests/baselines/reference/importHelpers.js
+++ b/tests/baselines/reference/importHelpers.js
@@ -45,7 +45,8 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -93,7 +94,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersAmd.js b/tests/baselines/reference/importHelpersAmd.js
index bb02cbf04173a..89fab70bdba62 100644
--- a/tests/baselines/reference/importHelpersAmd.js
+++ b/tests/baselines/reference/importHelpersAmd.js
@@ -32,7 +32,8 @@ define(["require", "exports", "tslib", "./a"], function (require, exports, tslib
     var B = (function (_super) {
         tslib_1.__extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/importHelpersInIsolatedModules.js b/tests/baselines/reference/importHelpersInIsolatedModules.js
index a5929bc152cf2..2a97d3d2d872e 100644
--- a/tests/baselines/reference/importHelpersInIsolatedModules.js
+++ b/tests/baselines/reference/importHelpersInIsolatedModules.js
@@ -45,7 +45,8 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -78,7 +79,8 @@ var A = (function () {
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersNoHelpers.js b/tests/baselines/reference/importHelpersNoHelpers.js
index 8c5afc99ece8b..d5f8db60f9766 100644
--- a/tests/baselines/reference/importHelpersNoHelpers.js
+++ b/tests/baselines/reference/importHelpersNoHelpers.js
@@ -39,7 +39,8 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -87,7 +88,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersNoModule.js b/tests/baselines/reference/importHelpersNoModule.js
index 36bc0c5f76bee..5891922f9f296 100644
--- a/tests/baselines/reference/importHelpersNoModule.js
+++ b/tests/baselines/reference/importHelpersNoModule.js
@@ -37,7 +37,8 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -85,7 +86,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersOutFile.js b/tests/baselines/reference/importHelpersOutFile.js
index cb50330c20c65..b4c2040aa7137 100644
--- a/tests/baselines/reference/importHelpersOutFile.js
+++ b/tests/baselines/reference/importHelpersOutFile.js
@@ -35,7 +35,8 @@ define("b", ["require", "exports", "tslib", "a"], function (require, exports, ts
     var B = (function (_super) {
         tslib_1.__extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(a_1.A));
@@ -46,7 +47,8 @@ define("c", ["require", "exports", "tslib", "a"], function (require, exports, ts
     var C = (function (_super) {
         tslib_2.__extends(C, _super);
         function C() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C;
     }(a_2.A));
diff --git a/tests/baselines/reference/importHelpersSystem.js b/tests/baselines/reference/importHelpersSystem.js
index 3c1ee19ec48a9..552bd0ed4046b 100644
--- a/tests/baselines/reference/importHelpersSystem.js
+++ b/tests/baselines/reference/importHelpersSystem.js
@@ -51,7 +51,8 @@ System.register(["tslib", "./a"], function (exports_1, context_1) {
             B = (function (_super) {
                 tslib_1.__extends(B, _super);
                 function B() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return B;
             }(a_1.A));
diff --git a/tests/baselines/reference/importShadowsGlobalName.js b/tests/baselines/reference/importShadowsGlobalName.js
index 316a94d9069b2..b4950b039f3e3 100644
--- a/tests/baselines/reference/importShadowsGlobalName.js
+++ b/tests/baselines/reference/importShadowsGlobalName.js
@@ -31,7 +31,8 @@ define(["require", "exports", "Foo"], function (require, exports, Error) {
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Bar;
     }(Error));
diff --git a/tests/baselines/reference/importUsedInExtendsList1.js b/tests/baselines/reference/importUsedInExtendsList1.js
index b9827d5bc9368..956e20a104520 100644
--- a/tests/baselines/reference/importUsedInExtendsList1.js
+++ b/tests/baselines/reference/importUsedInExtendsList1.js
@@ -31,7 +31,8 @@ var foo = require("./importUsedInExtendsList1_require");
 var Sub = (function (_super) {
     __extends(Sub, _super);
     function Sub() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Sub;
 }(foo.Super));
diff --git a/tests/baselines/reference/indexerConstraints2.js b/tests/baselines/reference/indexerConstraints2.js
index dd143da97e672..c8b910abb2dcd 100644
--- a/tests/baselines/reference/indexerConstraints2.js
+++ b/tests/baselines/reference/indexerConstraints2.js
@@ -42,7 +42,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -55,7 +56,8 @@ var F = (function () {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return G;
 }(F));
@@ -68,7 +70,8 @@ var H = (function () {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return I;
 }(H));
@@ -81,7 +84,8 @@ var J = (function () {
 var K = (function (_super) {
     __extends(K, _super);
     function K() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return K;
 }(J));
diff --git a/tests/baselines/reference/indirectSelfReference.js b/tests/baselines/reference/indirectSelfReference.js
index 66d23a45b7267..c1c77ec5fc97e 100644
--- a/tests/baselines/reference/indirectSelfReference.js
+++ b/tests/baselines/reference/indirectSelfReference.js
@@ -11,14 +11,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var a = (function (_super) {
     __extends(a, _super);
     function a() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return a;
 }(b));
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/indirectSelfReferenceGeneric.js b/tests/baselines/reference/indirectSelfReferenceGeneric.js
index 99ab918e63142..366ad1f0af54d 100644
--- a/tests/baselines/reference/indirectSelfReferenceGeneric.js
+++ b/tests/baselines/reference/indirectSelfReferenceGeneric.js
@@ -11,14 +11,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var a = (function (_super) {
     __extends(a, _super);
     function a() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return a;
 }(b));
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js b/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
index 6321f77d31fb0..9b145b55d0401 100644
--- a/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
+++ b/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
@@ -43,7 +43,8 @@ var Base = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(Base));
diff --git a/tests/baselines/reference/inheritFromGenericTypeParameter.js b/tests/baselines/reference/inheritFromGenericTypeParameter.js
index f5bc099cb8dcf..5db269f7c58e2 100644
--- a/tests/baselines/reference/inheritFromGenericTypeParameter.js
+++ b/tests/baselines/reference/inheritFromGenericTypeParameter.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(T));
diff --git a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
index 9462df7a3c3af..7f3e872245bb3 100644
--- a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
+++ b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
@@ -24,14 +24,16 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(B));
diff --git a/tests/baselines/reference/inheritance.js b/tests/baselines/reference/inheritance.js
index 52fbfaffddeca..c4acea2226021 100644
--- a/tests/baselines/reference/inheritance.js
+++ b/tests/baselines/reference/inheritance.js
@@ -53,14 +53,16 @@ var B2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(B2));
@@ -72,7 +74,8 @@ var N = (function () {
 var ND = (function (_super) {
     __extends(ND, _super);
     function ND() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ND;
 }(N));
@@ -86,7 +89,8 @@ var Good = (function () {
 var Baad = (function (_super) {
     __extends(Baad, _super);
     function Baad() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Baad.prototype.f = function () { return 0; };
     Baad.prototype.g = function (n) { return 0; };
diff --git a/tests/baselines/reference/inheritance1.js b/tests/baselines/reference/inheritance1.js
index c65155ee55ccc..f555d5bf69464 100644
--- a/tests/baselines/reference/inheritance1.js
+++ b/tests/baselines/reference/inheritance1.js
@@ -75,7 +75,8 @@ var Control = (function () {
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Button.prototype.select = function () { };
     return Button;
@@ -83,7 +84,8 @@ var Button = (function (_super) {
 var TextBox = (function (_super) {
     __extends(TextBox, _super);
     function TextBox() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     TextBox.prototype.select = function () { };
     return TextBox;
@@ -91,14 +93,16 @@ var TextBox = (function (_super) {
 var ImageBase = (function (_super) {
     __extends(ImageBase, _super);
     function ImageBase() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ImageBase;
 }(Control));
 var Image1 = (function (_super) {
     __extends(Image1, _super);
     function Image1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Image1;
 }(Control));
diff --git a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
index b416cf3fb93de..2ed366d7b8ac6 100644
--- a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
+++ b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
@@ -25,14 +25,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
index 25a977531ca45..369c6b20a14d8 100644
--- a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
+++ b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
@@ -25,14 +25,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js b/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
index dfd055569257f..d884364d95c74 100644
--- a/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
+++ b/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
@@ -25,14 +25,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
index b4efaa896211b..c1289f99a78e6 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
@@ -40,7 +40,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
index 5044a8e03ac29..665b547154dbc 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
@@ -31,7 +31,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
index 6ebdc336a6445..a9a92003542f3 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
@@ -26,7 +26,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
index 3ddff027c1a01..17541ee163da1 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
@@ -37,7 +37,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js b/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
index a6c3beea4efb3..a154d0426a974 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
@@ -28,7 +28,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js b/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
index 94b602d29d9ee..be10895642e7d 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
@@ -23,7 +23,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
index a8fc4d5a3dd71..6895077abda36 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
@@ -37,7 +37,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
index 7d5cdb43e96c8..00c1093053bdc 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
@@ -26,7 +26,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
index 648f1d1622e92..6cbb7ae7e8ca4 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
@@ -21,7 +21,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js b/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
index 59675c56e5fd0..370e27514c183 100644
--- a/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
+++ b/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
@@ -21,7 +21,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js b/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
index 97464233027b9..a61b6bafabd24 100644
--- a/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
+++ b/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
@@ -40,7 +40,8 @@ var N;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D1;
     }(M.C1));
@@ -48,7 +49,8 @@ var N;
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D2;
     }(M.C2));
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
index 49145b010d4ba..9f71208e5dbcd 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
@@ -40,7 +40,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
index 4a202b7649792..2e0c3dc90d0c1 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
@@ -31,7 +31,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
index a0dd1177cfb45..95bf94572b15f 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
@@ -26,7 +26,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
index 06f907371ea1b..25d75bea5afd2 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
@@ -37,7 +37,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
index ea36c40480f0b..5c39c10e73854 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
@@ -32,7 +32,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js b/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
index ae523d53d9bcf..c37caf8d53c93 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
@@ -28,7 +28,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js b/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
index 93890bd829457..eb185d56d0bc3 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
@@ -23,7 +23,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js b/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
index 4d0f2438459d2..0779cc10d3759 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
@@ -23,7 +23,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js b/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
index f2dfda4e48ffa..4934947233f05 100644
--- a/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
+++ b/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
@@ -23,7 +23,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     b.x = function () {
         return new b().x;
diff --git a/tests/baselines/reference/inheritanceStaticMembersCompatible.js b/tests/baselines/reference/inheritanceStaticMembersCompatible.js
index 0dc736a375d7a..27a65d513fd80 100644
--- a/tests/baselines/reference/inheritanceStaticMembersCompatible.js
+++ b/tests/baselines/reference/inheritanceStaticMembersCompatible.js
@@ -21,7 +21,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticMembersIncompatible.js b/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
index 51c474430ad1f..7cfafdf1f9d65 100644
--- a/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
+++ b/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
@@ -21,7 +21,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
index d138ac3eba8f7..1840a7829e8d6 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
@@ -36,7 +36,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
index 3d3f550713ebc..8e498273b86cb 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
@@ -26,7 +26,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
index e23917e40a411..c003eaa60b4e8 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
@@ -21,7 +21,8 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritedConstructorWithRestParams.js b/tests/baselines/reference/inheritedConstructorWithRestParams.js
index 2d312d9859daa..ca6a379816fc2 100644
--- a/tests/baselines/reference/inheritedConstructorWithRestParams.js
+++ b/tests/baselines/reference/inheritedConstructorWithRestParams.js
@@ -32,7 +32,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/inheritedConstructorWithRestParams2.js b/tests/baselines/reference/inheritedConstructorWithRestParams2.js
index 0ad25b302f059..b323aefbd4839 100644
--- a/tests/baselines/reference/inheritedConstructorWithRestParams2.js
+++ b/tests/baselines/reference/inheritedConstructorWithRestParams2.js
@@ -53,14 +53,16 @@ var BaseBase2 = (function () {
 var Base = (function (_super) {
     __extends(Base, _super);
     function Base() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Base;
 }(BaseBase));
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/inheritedModuleMembersForClodule.js b/tests/baselines/reference/inheritedModuleMembersForClodule.js
index 95b71069584ce..1de6f5f638aee 100644
--- a/tests/baselines/reference/inheritedModuleMembersForClodule.js
+++ b/tests/baselines/reference/inheritedModuleMembersForClodule.js
@@ -38,7 +38,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -53,7 +54,8 @@ var D;
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.bar = function () {
         return this.foo();
diff --git a/tests/baselines/reference/instanceOfAssignability.js b/tests/baselines/reference/instanceOfAssignability.js
index 775afe869461b..f78378f0885a2 100644
--- a/tests/baselines/reference/instanceOfAssignability.js
+++ b/tests/baselines/reference/instanceOfAssignability.js
@@ -115,14 +115,16 @@ var Animal = (function () {
 var Mammal = (function (_super) {
     __extends(Mammal, _super);
     function Mammal() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Mammal;
 }(Animal));
 var Giraffe = (function (_super) {
     __extends(Giraffe, _super);
     function Giraffe() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Giraffe;
 }(Mammal));
diff --git a/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js b/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
index a507a19a456ee..cf056e768d837 100644
--- a/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
+++ b/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
@@ -69,7 +69,8 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
@@ -101,7 +102,8 @@ var Generic;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/instanceSubtypeCheck2.js b/tests/baselines/reference/instanceSubtypeCheck2.js
index d72f29e93bf0d..e70dc7b64811f 100644
--- a/tests/baselines/reference/instanceSubtypeCheck2.js
+++ b/tests/baselines/reference/instanceSubtypeCheck2.js
@@ -21,7 +21,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js b/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
index 97be21377229d..de2789caa68a8 100644
--- a/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
+++ b/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
@@ -128,7 +128,8 @@ var A = (function () {
 var A1 = (function (_super) {
     __extends(A1, _super);
     function A1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A1;
 }(A));
@@ -140,7 +141,8 @@ var A2 = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/instantiatedReturnTypeContravariance.js b/tests/baselines/reference/instantiatedReturnTypeContravariance.js
index 4d5e437630809..83ad38e64f034 100644
--- a/tests/baselines/reference/instantiatedReturnTypeContravariance.js
+++ b/tests/baselines/reference/instantiatedReturnTypeContravariance.js
@@ -47,7 +47,8 @@ var c = (function () {
 var d = (function (_super) {
     __extends(d, _super);
     function d() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     d.prototype.foo = function () {
         return null;
diff --git a/tests/baselines/reference/interfaceClassMerging.js b/tests/baselines/reference/interfaceClassMerging.js
index 8138e7888b344..6111e7f8cee77 100644
--- a/tests/baselines/reference/interfaceClassMerging.js
+++ b/tests/baselines/reference/interfaceClassMerging.js
@@ -57,7 +57,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Bar.prototype.method = function (a) {
         return this.optionalProperty;
diff --git a/tests/baselines/reference/interfaceClassMerging2.js b/tests/baselines/reference/interfaceClassMerging2.js
index 99f5b07696d57..499bd21990543 100644
--- a/tests/baselines/reference/interfaceClassMerging2.js
+++ b/tests/baselines/reference/interfaceClassMerging2.js
@@ -53,7 +53,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Bar.prototype.classBarMethod = function () {
         return this;
diff --git a/tests/baselines/reference/interfaceExtendsClass1.js b/tests/baselines/reference/interfaceExtendsClass1.js
index 43c7c6f6fa473..70ceaa8acd3bf 100644
--- a/tests/baselines/reference/interfaceExtendsClass1.js
+++ b/tests/baselines/reference/interfaceExtendsClass1.js
@@ -32,7 +32,8 @@ var Control = (function () {
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Button.prototype.select = function () { };
     return Button;
@@ -40,7 +41,8 @@ var Button = (function (_super) {
 var TextBox = (function (_super) {
     __extends(TextBox, _super);
     function TextBox() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     TextBox.prototype.select = function () { };
     return TextBox;
@@ -48,7 +50,8 @@ var TextBox = (function (_super) {
 var Image = (function (_super) {
     __extends(Image, _super);
     function Image() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Image;
 }(Control));
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
index e1bdbff85dd9d..5e6695dd20088 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
@@ -43,7 +43,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function (x) { return x; };
     D.prototype.other = function (x) { return x; };
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
index 1592b1a723b54..6f35c3f0e40ab 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
@@ -39,7 +39,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 2;
         this.y = 3;
     }
@@ -51,7 +52,8 @@ var D = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = "";
     }
     D2.prototype.foo = function (x) { return x; };
diff --git a/tests/baselines/reference/interfaceImplementation8.js b/tests/baselines/reference/interfaceImplementation8.js
index edfb33bfe1b4f..f3bfa4db6a586 100644
--- a/tests/baselines/reference/interfaceImplementation8.js
+++ b/tests/baselines/reference/interfaceImplementation8.js
@@ -64,21 +64,24 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(C1));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C5;
 }(C2));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C6;
 }(C3));
@@ -90,7 +93,8 @@ var C7 = (function () {
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C8;
 }(C7));
diff --git a/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js b/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
index cb3c22b52eb16..75bf3f9188442 100644
--- a/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
+++ b/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
@@ -95,7 +95,8 @@ var Y;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return BB;
     }(A));
@@ -110,7 +111,8 @@ var Y2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(AA));
@@ -144,7 +146,8 @@ var YY;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return BB;
     }(A));
@@ -159,7 +162,8 @@ var YY2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(AA));
@@ -193,7 +197,8 @@ var YYY;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return BB;
     }(A));
@@ -208,7 +213,8 @@ var YYY2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(AA));
diff --git a/tests/baselines/reference/invalidMultipleVariableDeclarations.js b/tests/baselines/reference/invalidMultipleVariableDeclarations.js
index 0c90c6d002598..b4fbd6f369899 100644
--- a/tests/baselines/reference/invalidMultipleVariableDeclarations.js
+++ b/tests/baselines/reference/invalidMultipleVariableDeclarations.js
@@ -67,7 +67,8 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/invalidReturnStatements.js b/tests/baselines/reference/invalidReturnStatements.js
index 0f5b0d3e08dd5..1409b1c59a8b2 100644
--- a/tests/baselines/reference/invalidReturnStatements.js
+++ b/tests/baselines/reference/invalidReturnStatements.js
@@ -41,7 +41,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/isolatedModulesImportExportElision.js b/tests/baselines/reference/isolatedModulesImportExportElision.js
index 2d391a64fe72b..baf2d1de129cb 100644
--- a/tests/baselines/reference/isolatedModulesImportExportElision.js
+++ b/tests/baselines/reference/isolatedModulesImportExportElision.js
@@ -26,7 +26,8 @@ var ns = require("module");
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(module_2.c2.C));
diff --git a/tests/baselines/reference/jsxViaImport.js b/tests/baselines/reference/jsxViaImport.js
index 63c84090c9cb2..c149d4e3c3d72 100644
--- a/tests/baselines/reference/jsxViaImport.js
+++ b/tests/baselines/reference/jsxViaImport.js
@@ -35,7 +35,8 @@ var BaseComponent = require("BaseComponent");
 var TestComponent = (function (_super) {
     __extends(TestComponent, _super);
     function TestComponent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     TestComponent.prototype.render = function () {
         return <BaseComponent />;
diff --git a/tests/baselines/reference/lambdaArgCrash.js b/tests/baselines/reference/lambdaArgCrash.js
index 822aa71efd047..16653cfb4f3a2 100644
--- a/tests/baselines/reference/lambdaArgCrash.js
+++ b/tests/baselines/reference/lambdaArgCrash.js
@@ -56,7 +56,8 @@ var Event = (function () {
 var ItemSetEvent = (function (_super) {
     __extends(ItemSetEvent, _super);
     function ItemSetEvent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     ItemSetEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/lift.js b/tests/baselines/reference/lift.js
index 568379948bcf3..bfbf75b17310b 100644
--- a/tests/baselines/reference/lift.js
+++ b/tests/baselines/reference/lift.js
@@ -32,7 +32,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C(y, z, w) {
-        _super.call(this, y);
+        var _this;
+        _this = _super.call(this, y) || this;
         var x = 10 + w;
         var ll = x * w;
     }
diff --git a/tests/baselines/reference/localTypes1.js b/tests/baselines/reference/localTypes1.js
index a4f835c8669c7..96c9337817d4d 100644
--- a/tests/baselines/reference/localTypes1.js
+++ b/tests/baselines/reference/localTypes1.js
@@ -300,7 +300,8 @@ function f6() {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                _super.apply(this, arguments);
+                var _this = _super.apply(this, arguments) || this;
+                return _this;
             }
             return B;
         }(A));
@@ -308,7 +309,8 @@ function f6() {
             var C = (function (_super) {
                 __extends(C, _super);
                 function C() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return C;
             }(B));
diff --git a/tests/baselines/reference/m7Bugs.js b/tests/baselines/reference/m7Bugs.js
index 6292356faf553..19cd9ee463030 100644
--- a/tests/baselines/reference/m7Bugs.js
+++ b/tests/baselines/reference/m7Bugs.js
@@ -42,7 +42,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/mergedDeclarations5.js b/tests/baselines/reference/mergedDeclarations5.js
index ce4b929c7f99c..53a8c983399f6 100644
--- a/tests/baselines/reference/mergedDeclarations5.js
+++ b/tests/baselines/reference/mergedDeclarations5.js
@@ -27,7 +27,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.foo = function () { };
     return B;
diff --git a/tests/baselines/reference/mergedDeclarations6.js b/tests/baselines/reference/mergedDeclarations6.js
index 2ff9d3e660423..50108773a7071 100644
--- a/tests/baselines/reference/mergedDeclarations6.js
+++ b/tests/baselines/reference/mergedDeclarations6.js
@@ -47,7 +47,8 @@ define(["require", "exports", "./a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         B.prototype.setProtected = function () {
         };
diff --git a/tests/baselines/reference/mergedInheritedClassInterface.js b/tests/baselines/reference/mergedInheritedClassInterface.js
index 72ac1c8a92882..fd0bea5494c80 100644
--- a/tests/baselines/reference/mergedInheritedClassInterface.js
+++ b/tests/baselines/reference/mergedInheritedClassInterface.js
@@ -61,7 +61,8 @@ var BaseClass = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Child.prototype.method = function () { };
     return Child;
@@ -75,7 +76,8 @@ var ChildNoBaseClass = (function () {
 var Grandchild = (function (_super) {
     __extends(Grandchild, _super);
     function Grandchild() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Grandchild;
 }(ChildNoBaseClass));
diff --git a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
index a7e341c31cebd..a3baa1920e3fe 100644
--- a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
+++ b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
@@ -50,14 +50,16 @@ var C2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(C2));
diff --git a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
index 3d9c4e1175ed8..e21ca151c8707 100644
--- a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
+++ b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
@@ -57,7 +57,8 @@ var C2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/missingPropertiesOfClassExpression.js b/tests/baselines/reference/missingPropertiesOfClassExpression.js
index 54834397b64c2..c1f4480241c19 100644
--- a/tests/baselines/reference/missingPropertiesOfClassExpression.js
+++ b/tests/baselines/reference/missingPropertiesOfClassExpression.js
@@ -15,7 +15,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var George = (function (_super) {
     __extends(George, _super);
     function George() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return George;
 }((function () {
diff --git a/tests/baselines/reference/moduleAsBaseType.js b/tests/baselines/reference/moduleAsBaseType.js
index 71f168463635a..598ddaef2de0d 100644
--- a/tests/baselines/reference/moduleAsBaseType.js
+++ b/tests/baselines/reference/moduleAsBaseType.js
@@ -13,7 +13,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(M));
diff --git a/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js b/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
index cd2df2633aed0..2f4ac430cc127 100644
--- a/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
+++ b/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
@@ -31,7 +31,8 @@ define(["require", "exports"], function (require, exports) {
     var Test1 = (function (_super) {
         __extends(Test1, _super);
         function Test1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Test1;
     }(C1));
diff --git a/tests/baselines/reference/moduleWithStatementsOfEveryKind.js b/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
index ec434286f4327..11053d76d2dfe 100644
--- a/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
+++ b/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
@@ -79,14 +79,16 @@ var A;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(AA));
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return BB;
     }(A));
@@ -130,7 +132,8 @@ var Y;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(AA));
@@ -138,7 +141,8 @@ var Y;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return BB;
     }(A));
diff --git a/tests/baselines/reference/multipleInheritance.js b/tests/baselines/reference/multipleInheritance.js
index 26372bfb71827..80e9a469398af 100644
--- a/tests/baselines/reference/multipleInheritance.js
+++ b/tests/baselines/reference/multipleInheritance.js
@@ -57,28 +57,32 @@ var B2 = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B1));
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(B2));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(D1));
@@ -90,7 +94,8 @@ var N = (function () {
 var ND = (function (_super) {
     __extends(ND, _super);
     function ND() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ND;
 }(N));
@@ -104,7 +109,8 @@ var Good = (function () {
 var Baad = (function (_super) {
     __extends(Baad, _super);
     function Baad() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Baad.prototype.f = function () { return 0; };
     Baad.prototype.g = function (n) { return 0; };
diff --git a/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js b/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
index c8cca671327e1..7c5ec66c6be58 100644
--- a/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
+++ b/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
@@ -25,7 +25,8 @@ var foo = (function () {
 var foo2 = (function (_super) {
     __extends(foo2, _super);
     function foo2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return foo2;
 }(foo));
diff --git a/tests/baselines/reference/noEmitHelpers.js b/tests/baselines/reference/noEmitHelpers.js
index b2c26c6af75df..c3d27cac8a968 100644
--- a/tests/baselines/reference/noEmitHelpers.js
+++ b/tests/baselines/reference/noEmitHelpers.js
@@ -13,7 +13,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js b/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
index b9927ebf193e9..bbab8e9ccdd6e 100644
--- a/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
+++ b/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
@@ -19,7 +19,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Bar;
 }(Foo)); // Valid
diff --git a/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js b/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
index cef2759e1d530..1901e16944749 100644
--- a/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
+++ b/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
@@ -61,7 +61,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () { return ''; };
     return B;
diff --git a/tests/baselines/reference/numericIndexerConstraint3.js b/tests/baselines/reference/numericIndexerConstraint3.js
index 9f7a61fe30d0d..97c3e56d42379 100644
--- a/tests/baselines/reference/numericIndexerConstraint3.js
+++ b/tests/baselines/reference/numericIndexerConstraint3.js
@@ -26,7 +26,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/numericIndexerConstraint4.js b/tests/baselines/reference/numericIndexerConstraint4.js
index a9eace23833da..732f7e2672ce5 100644
--- a/tests/baselines/reference/numericIndexerConstraint4.js
+++ b/tests/baselines/reference/numericIndexerConstraint4.js
@@ -26,7 +26,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/numericIndexerTyping2.js b/tests/baselines/reference/numericIndexerTyping2.js
index 47fb46794f093..1d38f844384f1 100644
--- a/tests/baselines/reference/numericIndexerTyping2.js
+++ b/tests/baselines/reference/numericIndexerTyping2.js
@@ -26,7 +26,8 @@ var I = (function () {
 var I2 = (function (_super) {
     __extends(I2, _super);
     function I2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return I2;
 }(I));
diff --git a/tests/baselines/reference/objectCreationOfElementAccessExpression.js b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
index dce09972c8387..ddfbce8fc127f 100644
--- a/tests/baselines/reference/objectCreationOfElementAccessExpression.js
+++ b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
@@ -81,7 +81,8 @@ var Food = (function () {
 var MonsterFood = (function (_super) {
     __extends(MonsterFood, _super);
     function MonsterFood(name, flavor) {
-        _super.call(this, name);
+        var _this;
+        _this = _super.call(this, name) || this;
         this.flavor = flavor;
     }
     return MonsterFood;
@@ -89,7 +90,8 @@ var MonsterFood = (function (_super) {
 var IceCream = (function (_super) {
     __extends(IceCream, _super);
     function IceCream(flavor) {
-        _super.call(this, "Ice Cream", flavor);
+        var _this;
+        _this = _super.call(this, "Ice Cream", flavor) || this;
         this.flavor = flavor;
     }
     return IceCream;
@@ -97,7 +99,8 @@ var IceCream = (function (_super) {
 var Cookie = (function (_super) {
     __extends(Cookie, _super);
     function Cookie(flavor, isGlutenFree) {
-        _super.call(this, "Cookie", flavor);
+        var _this;
+        _this = _super.call(this, "Cookie", flavor) || this;
         this.flavor = flavor;
         this.isGlutenFree = isGlutenFree;
     }
@@ -106,7 +109,8 @@ var Cookie = (function (_super) {
 var PetFood = (function (_super) {
     __extends(PetFood, _super);
     function PetFood(name, whereToBuy) {
-        _super.call(this, name);
+        var _this;
+        _this = _super.call(this, name) || this;
         this.whereToBuy = whereToBuy;
     }
     return PetFood;
@@ -114,7 +118,8 @@ var PetFood = (function (_super) {
 var ExpensiveOrganicDogFood = (function (_super) {
     __extends(ExpensiveOrganicDogFood, _super);
     function ExpensiveOrganicDogFood(whereToBuy) {
-        _super.call(this, "Origen", whereToBuy);
+        var _this;
+        _this = _super.call(this, "Origen", whereToBuy) || this;
         this.whereToBuy = whereToBuy;
     }
     return ExpensiveOrganicDogFood;
@@ -122,7 +127,8 @@ var ExpensiveOrganicDogFood = (function (_super) {
 var ExpensiveOrganicCatFood = (function (_super) {
     __extends(ExpensiveOrganicCatFood, _super);
     function ExpensiveOrganicCatFood(whereToBuy, containsFish) {
-        _super.call(this, "Nature's Logic", whereToBuy);
+        var _this;
+        _this = _super.call(this, "Nature's Logic", whereToBuy) || this;
         this.whereToBuy = whereToBuy;
         this.containsFish = containsFish;
     }
diff --git a/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js b/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
index 9c5bcfb8e2d43..76c1890094511 100644
--- a/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
+++ b/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
@@ -68,7 +68,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
index 29781229b5abe..3df18cb27cb09 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
@@ -147,14 +147,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
index 7ecb597a2d9ab..e7d2f603d5c31 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
@@ -140,7 +140,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -162,14 +163,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
index 9710afe700d05..e0b75f54208f9 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
@@ -147,14 +147,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates.js b/tests/baselines/reference/objectTypesIdentityWithPrivates.js
index 7d6be5eaf8fbe..681af407bd402 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates.js
@@ -145,14 +145,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates2.js b/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
index cb9c677f024ef..2011b741df2f9 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
@@ -53,7 +53,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates3.js b/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
index 241fbcaf27e96..80bdd4c87e1e2 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
@@ -39,7 +39,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C1));
@@ -53,7 +54,8 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js b/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
index c0578c2fba18b..3eac80c60fcb4 100644
--- a/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
+++ b/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
@@ -147,14 +147,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js b/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
index 0670d45a5a529..d55ef5eb28c5a 100644
--- a/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
@@ -140,7 +140,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -162,14 +163,16 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/optionalConstructorArgInSuper.js b/tests/baselines/reference/optionalConstructorArgInSuper.js
index 3e6a47b4de21a..04056fa9c14d8 100644
--- a/tests/baselines/reference/optionalConstructorArgInSuper.js
+++ b/tests/baselines/reference/optionalConstructorArgInSuper.js
@@ -25,7 +25,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/optionalMethods.js b/tests/baselines/reference/optionalMethods.js
index 42decf512e4d7..408f73b653302 100644
--- a/tests/baselines/reference/optionalMethods.js
+++ b/tests/baselines/reference/optionalMethods.js
@@ -109,7 +109,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.a = 1;
     }
     Derived.prototype.f = function () { return 1; };
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index 6d42c38f90738..f53f0c74a541b 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -161,8 +161,9 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2(v2) {
+        var _this;
         if (v2 === void 0) { v2 = 6; }
-        _super.call(this, v2);
+        _this = _super.call(this, v2) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/optionalParamInOverride.js b/tests/baselines/reference/optionalParamInOverride.js
index f6ccdbe3fab16..a8bd88ed3a8b1 100644
--- a/tests/baselines/reference/optionalParamInOverride.js
+++ b/tests/baselines/reference/optionalParamInOverride.js
@@ -22,7 +22,8 @@ var Z = (function () {
 var Y = (function (_super) {
     __extends(Y, _super);
     function Y() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Y.prototype.func = function (value) { };
     return Y;
diff --git a/tests/baselines/reference/optionalParameterProperty.js b/tests/baselines/reference/optionalParameterProperty.js
index 48cefeef22ce6..b23da97c7902d 100644
--- a/tests/baselines/reference/optionalParameterProperty.js
+++ b/tests/baselines/reference/optionalParameterProperty.js
@@ -25,7 +25,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D(p) {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.p = p;
     }
     return D;
diff --git a/tests/baselines/reference/outModuleConcatAmd.js b/tests/baselines/reference/outModuleConcatAmd.js
index 8a478e675c69e..5643875efd362 100644
--- a/tests/baselines/reference/outModuleConcatAmd.js
+++ b/tests/baselines/reference/outModuleConcatAmd.js
@@ -28,7 +28,8 @@ define("b", ["require", "exports", "ref/a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/outModuleConcatAmd.js.map b/tests/baselines/reference/outModuleConcatAmd.js.map
index 7f9893b234677..25873d9cd0763 100644
--- a/tests/baselines/reference/outModuleConcatAmd.js.map
+++ b/tests/baselines/reference/outModuleConcatAmd.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;IACA;QAAA;QAAiB,CAAC;QAAD,QAAC;IAAD,CAAC,AAAlB,IAAkB;IAAlB,cAAkB;;;;ICAlB;QAAuB,qBAAC;QAAxB;YAAuB,8BAAC;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;IACA;QAAA;QAAiB,CAAC;QAAD,QAAC;IAAD,CAAC,AAAlB,IAAkB;IAAlB,cAAkB;;;;ICAlB;QAAuB,qBAAC;QAAxB;YAAuB,kDAAC;;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt b/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
index ba7f1d932451e..2fa35a323a081 100644
--- a/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
+++ b/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
@@ -92,34 +92,35 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>        function B() {
 1 >^^^^^^^^
-2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(19, 9) Source(2, 1) + SourceIndex(1)
 ---
->>>            _super.apply(this, arguments);
+>>>            var _this = _super.apply(this, arguments) || this;
 1->^^^^^^^^^^^^
-2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 1->export class B extends 
 2 >            A
 1->Emitted(20, 13) Source(2, 24) + SourceIndex(1)
-2 >Emitted(20, 43) Source(2, 25) + SourceIndex(1)
+2 >Emitted(20, 63) Source(2, 25) + SourceIndex(1)
 ---
+>>>            return _this;
 >>>        }
 1 >^^^^^^^^
 2 >        ^
 3 >         ^^^^^^^^^->
 1 > { 
 2 >        }
-1 >Emitted(21, 9) Source(2, 28) + SourceIndex(1)
-2 >Emitted(21, 10) Source(2, 29) + SourceIndex(1)
+1 >Emitted(22, 9) Source(2, 28) + SourceIndex(1)
+2 >Emitted(22, 10) Source(2, 29) + SourceIndex(1)
 ---
 >>>        return B;
 1->^^^^^^^^
 2 >        ^^^^^^^^
 1->
 2 >        }
-1->Emitted(22, 9) Source(2, 28) + SourceIndex(1)
-2 >Emitted(22, 17) Source(2, 29) + SourceIndex(1)
+1->Emitted(23, 9) Source(2, 28) + SourceIndex(1)
+2 >Emitted(23, 17) Source(2, 29) + SourceIndex(1)
 ---
 >>>    }(a_1.A));
 1 >^^^^
@@ -135,20 +136,20 @@ sourceFile:tests/cases/compiler/b.ts
 4 >     export class B extends 
 5 >      A
 6 >            { }
-1 >Emitted(23, 5) Source(2, 28) + SourceIndex(1)
-2 >Emitted(23, 6) Source(2, 29) + SourceIndex(1)
-3 >Emitted(23, 6) Source(2, 1) + SourceIndex(1)
-4 >Emitted(23, 7) Source(2, 24) + SourceIndex(1)
-5 >Emitted(23, 12) Source(2, 25) + SourceIndex(1)
-6 >Emitted(23, 15) Source(2, 29) + SourceIndex(1)
+1 >Emitted(24, 5) Source(2, 28) + SourceIndex(1)
+2 >Emitted(24, 6) Source(2, 29) + SourceIndex(1)
+3 >Emitted(24, 6) Source(2, 1) + SourceIndex(1)
+4 >Emitted(24, 7) Source(2, 24) + SourceIndex(1)
+5 >Emitted(24, 12) Source(2, 25) + SourceIndex(1)
+6 >Emitted(24, 15) Source(2, 29) + SourceIndex(1)
 ---
 >>>    exports.B = B;
 1->^^^^
 2 >    ^^^^^^^^^^^^^^
 1->
 2 >    export class B extends A { }
-1->Emitted(24, 5) Source(2, 1) + SourceIndex(1)
-2 >Emitted(24, 19) Source(2, 29) + SourceIndex(1)
+1->Emitted(25, 5) Source(2, 1) + SourceIndex(1)
+2 >Emitted(25, 19) Source(2, 29) + SourceIndex(1)
 ---
 >>>});
 >>>//# sourceMappingURL=all.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatSystem.js b/tests/baselines/reference/outModuleConcatSystem.js
index b23b73caf83ae..eecb410195812 100644
--- a/tests/baselines/reference/outModuleConcatSystem.js
+++ b/tests/baselines/reference/outModuleConcatSystem.js
@@ -44,7 +44,8 @@ System.register("b", ["ref/a"], function (exports_2, context_2) {
             B = (function (_super) {
                 __extends(B, _super);
                 function B() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return B;
             }(a_1.A));
diff --git a/tests/baselines/reference/outModuleConcatSystem.js.map b/tests/baselines/reference/outModuleConcatSystem.js.map
index 59ab70de53188..f77bed44ffcf6 100644
--- a/tests/baselines/reference/outModuleConcatSystem.js.map
+++ b/tests/baselines/reference/outModuleConcatSystem.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;;;;;;YACA;gBAAA;gBAAiB,CAAC;gBAAD,QAAC;YAAD,CAAC,AAAlB,IAAkB;;QAClB,CAAC;;;;;;;;;;;;;;YCDD;gBAAuB,qBAAC;gBAAxB;oBAAuB,8BAAC;gBAAG,CAAC;gBAAD,QAAC;YAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;;QAAA,CAAC"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;;;;;;YACA;gBAAA;gBAAiB,CAAC;gBAAD,QAAC;YAAD,CAAC,AAAlB,IAAkB;;QAClB,CAAC;;;;;;;;;;;;;;YCDD;gBAAuB,qBAAC;gBAAxB;oBAAuB,kDAAC;;gBAAG,CAAC;gBAAD,QAAC;YAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;;QAAA,CAAC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
index 86573493e2011..5287a760ac8eb 100644
--- a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
+++ b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
@@ -109,34 +109,35 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>                function B() {
 1 >^^^^^^^^^^^^^^^^
-2 >                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(35, 17) Source(2, 1) + SourceIndex(1)
 ---
->>>                    _super.apply(this, arguments);
+>>>                    var _this = _super.apply(this, arguments) || this;
 1->^^^^^^^^^^^^^^^^^^^^
-2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 1->export class B extends 
 2 >                    A
 1->Emitted(36, 21) Source(2, 24) + SourceIndex(1)
-2 >Emitted(36, 51) Source(2, 25) + SourceIndex(1)
+2 >Emitted(36, 71) Source(2, 25) + SourceIndex(1)
 ---
+>>>                    return _this;
 >>>                }
 1 >^^^^^^^^^^^^^^^^
 2 >                ^
 3 >                 ^^^^^^^^^->
 1 > { 
 2 >                }
-1 >Emitted(37, 17) Source(2, 28) + SourceIndex(1)
-2 >Emitted(37, 18) Source(2, 29) + SourceIndex(1)
+1 >Emitted(38, 17) Source(2, 28) + SourceIndex(1)
+2 >Emitted(38, 18) Source(2, 29) + SourceIndex(1)
 ---
 >>>                return B;
 1->^^^^^^^^^^^^^^^^
 2 >                ^^^^^^^^
 1->
 2 >                }
-1->Emitted(38, 17) Source(2, 28) + SourceIndex(1)
-2 >Emitted(38, 25) Source(2, 29) + SourceIndex(1)
+1->Emitted(39, 17) Source(2, 28) + SourceIndex(1)
+2 >Emitted(39, 25) Source(2, 29) + SourceIndex(1)
 ---
 >>>            }(a_1.A));
 1 >^^^^^^^^^^^^
@@ -152,12 +153,12 @@ sourceFile:tests/cases/compiler/b.ts
 4 >             export class B extends 
 5 >              A
 6 >                    { }
-1 >Emitted(39, 13) Source(2, 28) + SourceIndex(1)
-2 >Emitted(39, 14) Source(2, 29) + SourceIndex(1)
-3 >Emitted(39, 14) Source(2, 1) + SourceIndex(1)
-4 >Emitted(39, 15) Source(2, 24) + SourceIndex(1)
-5 >Emitted(39, 20) Source(2, 25) + SourceIndex(1)
-6 >Emitted(39, 23) Source(2, 29) + SourceIndex(1)
+1 >Emitted(40, 13) Source(2, 28) + SourceIndex(1)
+2 >Emitted(40, 14) Source(2, 29) + SourceIndex(1)
+3 >Emitted(40, 14) Source(2, 1) + SourceIndex(1)
+4 >Emitted(40, 15) Source(2, 24) + SourceIndex(1)
+5 >Emitted(40, 20) Source(2, 25) + SourceIndex(1)
+6 >Emitted(40, 23) Source(2, 29) + SourceIndex(1)
 ---
 >>>            exports_2("B", B);
 >>>        }
@@ -165,8 +166,8 @@ sourceFile:tests/cases/compiler/b.ts
 2 >        ^
 1->
 2 >        
-1->Emitted(41, 9) Source(2, 29) + SourceIndex(1)
-2 >Emitted(41, 10) Source(2, 30) + SourceIndex(1)
+1->Emitted(42, 9) Source(2, 29) + SourceIndex(1)
+2 >Emitted(42, 10) Source(2, 30) + SourceIndex(1)
 ---
 >>>    };
 >>>});
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.js b/tests/baselines/reference/outModuleTripleSlashRefs.js
index 90f8feab7bc52..ac2f2510b642c 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.js
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.js
@@ -57,7 +57,8 @@ define("b", ["require", "exports", "ref/a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.js.map b/tests/baselines/reference/outModuleTripleSlashRefs.js.map
index c6e1aab6bc886..1cdbef49afac2 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.js.map
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/b.ts","tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;AAAA,iCAAiC;AACjC;IAAA;IAEA,CAAC;IAAD,UAAC;AAAD,CAAC,AAFD,IAEC;;;ICFD,+BAA+B;IAC/B;QAAA;QAEA,CAAC;QAAD,QAAC;IAAD,CAAC,AAFD,IAEC;IAFD,cAEC;;;;ICHD;QAAuB,qBAAC;QAAxB;YAAuB,8BAAC;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/b.ts","tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;AAAA,iCAAiC;AACjC;IAAA;IAEA,CAAC;IAAD,UAAC;AAAD,CAAC,AAFD,IAEC;;;ICFD,+BAA+B;IAC/B;QAAA;QAEA,CAAC;QAAD,QAAC;IAAD,CAAC,AAFD,IAEC;IAFD,cAEC;;;;ICHD;QAAuB,qBAAC;QAAxB;YAAuB,kDAAC;;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt b/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
index 8be4382641967..e940429a74bb3 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
@@ -168,34 +168,35 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>        function B() {
 1 >^^^^^^^^
-2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(26, 9) Source(2, 1) + SourceIndex(2)
 ---
->>>            _super.apply(this, arguments);
+>>>            var _this = _super.apply(this, arguments) || this;
 1->^^^^^^^^^^^^
-2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 1->export class B extends 
 2 >            A
 1->Emitted(27, 13) Source(2, 24) + SourceIndex(2)
-2 >Emitted(27, 43) Source(2, 25) + SourceIndex(2)
+2 >Emitted(27, 63) Source(2, 25) + SourceIndex(2)
 ---
+>>>            return _this;
 >>>        }
 1 >^^^^^^^^
 2 >        ^
 3 >         ^^^^^^^^^->
 1 > { 
 2 >        }
-1 >Emitted(28, 9) Source(2, 28) + SourceIndex(2)
-2 >Emitted(28, 10) Source(2, 29) + SourceIndex(2)
+1 >Emitted(29, 9) Source(2, 28) + SourceIndex(2)
+2 >Emitted(29, 10) Source(2, 29) + SourceIndex(2)
 ---
 >>>        return B;
 1->^^^^^^^^
 2 >        ^^^^^^^^
 1->
 2 >        }
-1->Emitted(29, 9) Source(2, 28) + SourceIndex(2)
-2 >Emitted(29, 17) Source(2, 29) + SourceIndex(2)
+1->Emitted(30, 9) Source(2, 28) + SourceIndex(2)
+2 >Emitted(30, 17) Source(2, 29) + SourceIndex(2)
 ---
 >>>    }(a_1.A));
 1 >^^^^
@@ -211,20 +212,20 @@ sourceFile:tests/cases/compiler/b.ts
 4 >     export class B extends 
 5 >      A
 6 >            { }
-1 >Emitted(30, 5) Source(2, 28) + SourceIndex(2)
-2 >Emitted(30, 6) Source(2, 29) + SourceIndex(2)
-3 >Emitted(30, 6) Source(2, 1) + SourceIndex(2)
-4 >Emitted(30, 7) Source(2, 24) + SourceIndex(2)
-5 >Emitted(30, 12) Source(2, 25) + SourceIndex(2)
-6 >Emitted(30, 15) Source(2, 29) + SourceIndex(2)
+1 >Emitted(31, 5) Source(2, 28) + SourceIndex(2)
+2 >Emitted(31, 6) Source(2, 29) + SourceIndex(2)
+3 >Emitted(31, 6) Source(2, 1) + SourceIndex(2)
+4 >Emitted(31, 7) Source(2, 24) + SourceIndex(2)
+5 >Emitted(31, 12) Source(2, 25) + SourceIndex(2)
+6 >Emitted(31, 15) Source(2, 29) + SourceIndex(2)
 ---
 >>>    exports.B = B;
 1->^^^^
 2 >    ^^^^^^^^^^^^^^
 1->
 2 >    export class B extends A { }
-1->Emitted(31, 5) Source(2, 1) + SourceIndex(2)
-2 >Emitted(31, 19) Source(2, 29) + SourceIndex(2)
+1->Emitted(32, 5) Source(2, 1) + SourceIndex(2)
+2 >Emitted(32, 19) Source(2, 29) + SourceIndex(2)
 ---
 >>>});
 >>>//# sourceMappingURL=all.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/overload1.js b/tests/baselines/reference/overload1.js
index fd05873c64795..d83c8aea7add5 100644
--- a/tests/baselines/reference/overload1.js
+++ b/tests/baselines/reference/overload1.js
@@ -56,7 +56,8 @@ var O;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
@@ -64,7 +65,8 @@ var O;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C;
     }(B));
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks1.js b/tests/baselines/reference/overloadOnConstConstraintChecks1.js
index a3b7a32986150..ad49f8e9d7af3 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks1.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks1.js
@@ -37,7 +37,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -45,7 +46,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -53,7 +55,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks2.js b/tests/baselines/reference/overloadOnConstConstraintChecks2.js
index efb57153b13a6..2b521b4baf5cb 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks2.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks2.js
@@ -25,14 +25,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks3.js b/tests/baselines/reference/overloadOnConstConstraintChecks3.js
index 181f9d8129c50..df5e0065adb90 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks3.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks3.js
@@ -27,14 +27,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks4.js b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
index d73c59863adca..6a75061239549 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks4.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
@@ -27,7 +27,8 @@ var Z = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = 1;
     }
     return A;
@@ -35,14 +36,16 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js b/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
index c98075c04a180..5d0546d0edc56 100644
--- a/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
+++ b/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
@@ -26,7 +26,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -34,7 +35,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -42,7 +44,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadResolution.js b/tests/baselines/reference/overloadResolution.js
index 0d25322fdfcd8..c34d037b350ca 100644
--- a/tests/baselines/reference/overloadResolution.js
+++ b/tests/baselines/reference/overloadResolution.js
@@ -108,21 +108,24 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadResolutionClassConstructors.js b/tests/baselines/reference/overloadResolutionClassConstructors.js
index 9fa55fe1e95a1..0a899584c182e 100644
--- a/tests/baselines/reference/overloadResolutionClassConstructors.js
+++ b/tests/baselines/reference/overloadResolutionClassConstructors.js
@@ -115,21 +115,24 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadResolutionConstructors.js b/tests/baselines/reference/overloadResolutionConstructors.js
index 12d8480eefb3c..42dceff061e6b 100644
--- a/tests/baselines/reference/overloadResolutionConstructors.js
+++ b/tests/baselines/reference/overloadResolutionConstructors.js
@@ -116,21 +116,24 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadingOnConstants1.js b/tests/baselines/reference/overloadingOnConstants1.js
index b261201be40d9..52d8a1b7abe3a 100644
--- a/tests/baselines/reference/overloadingOnConstants1.js
+++ b/tests/baselines/reference/overloadingOnConstants1.js
@@ -40,7 +40,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -48,7 +49,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -56,7 +58,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadingOnConstants2.js b/tests/baselines/reference/overloadingOnConstants2.js
index 977ae7ec5b9ad..85976ae7fcdf0 100644
--- a/tests/baselines/reference/overloadingOnConstants2.js
+++ b/tests/baselines/reference/overloadingOnConstants2.js
@@ -42,7 +42,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/overridingPrivateStaticMembers.js b/tests/baselines/reference/overridingPrivateStaticMembers.js
index ddd9fae642989..b7ad5b665546a 100644
--- a/tests/baselines/reference/overridingPrivateStaticMembers.js
+++ b/tests/baselines/reference/overridingPrivateStaticMembers.js
@@ -21,7 +21,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/parseErrorInHeritageClause1.js b/tests/baselines/reference/parseErrorInHeritageClause1.js
index e2f66bfadd77d..0a29bdf2da0a4 100644
--- a/tests/baselines/reference/parseErrorInHeritageClause1.js
+++ b/tests/baselines/reference/parseErrorInHeritageClause1.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parser509630.js b/tests/baselines/reference/parser509630.js
index 4d94ea619ecc0..cdef63aa80f46 100644
--- a/tests/baselines/reference/parser509630.js
+++ b/tests/baselines/reference/parser509630.js
@@ -21,7 +21,8 @@ var Type = (function () {
 var Any = (function (_super) {
     __extends(Any, _super);
     function Any() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Any;
 }(Type));
diff --git a/tests/baselines/reference/parserAstSpans1.js b/tests/baselines/reference/parserAstSpans1.js
index 41f07380e97fa..6e6a423fe906f 100644
--- a/tests/baselines/reference/parserAstSpans1.js
+++ b/tests/baselines/reference/parserAstSpans1.js
@@ -318,7 +318,8 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        _super.call(this, 10);
+        var _this;
+        _this = _super.call(this, 10) || this;
         this.p1 = _super.prototype.c2_p1;
     }
     /** c3 f1*/
@@ -362,7 +363,8 @@ c2_i.nc_f1();
 var c4 = (function (_super) {
     __extends(c4, _super);
     function c4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return c4;
 }(c2));
@@ -404,7 +406,8 @@ var c5 = (function () {
 var c6 = (function (_super) {
     __extends(c6, _super);
     function c6() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.d = _super.prototype.b;
     }
     return c6;
diff --git a/tests/baselines/reference/parserClassDeclaration1.js b/tests/baselines/reference/parserClassDeclaration1.js
index 41ecc9135c043..f91efad621e1f 100644
--- a/tests/baselines/reference/parserClassDeclaration1.js
+++ b/tests/baselines/reference/parserClassDeclaration1.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration3.js b/tests/baselines/reference/parserClassDeclaration3.js
index c375b4b5a211c..9d51b0ed25e18 100644
--- a/tests/baselines/reference/parserClassDeclaration3.js
+++ b/tests/baselines/reference/parserClassDeclaration3.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/parserClassDeclaration4.js b/tests/baselines/reference/parserClassDeclaration4.js
index f19ac06c35cc4..7c91281d05cac 100644
--- a/tests/baselines/reference/parserClassDeclaration4.js
+++ b/tests/baselines/reference/parserClassDeclaration4.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration5.js b/tests/baselines/reference/parserClassDeclaration5.js
index 272edc89fb6d5..aeb7ce0919054 100644
--- a/tests/baselines/reference/parserClassDeclaration5.js
+++ b/tests/baselines/reference/parserClassDeclaration5.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration6.js b/tests/baselines/reference/parserClassDeclaration6.js
index 88d8481d52a91..b14257310c4ec 100644
--- a/tests/baselines/reference/parserClassDeclaration6.js
+++ b/tests/baselines/reference/parserClassDeclaration6.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
index b53c41fb45c33..c4a2fd297114b 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
index 500f6d38c6d38..ae9d5068e294d 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
index 8c02a996ea514..8992706cd169b 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserGenericsInTypeContexts1.js b/tests/baselines/reference/parserGenericsInTypeContexts1.js
index f6f4f39393fb4..0ec560c130625 100644
--- a/tests/baselines/reference/parserGenericsInTypeContexts1.js
+++ b/tests/baselines/reference/parserGenericsInTypeContexts1.js
@@ -26,7 +26,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserGenericsInTypeContexts2.js b/tests/baselines/reference/parserGenericsInTypeContexts2.js
index 99e19586c52da..d4c754fb0b154 100644
--- a/tests/baselines/reference/parserGenericsInTypeContexts2.js
+++ b/tests/baselines/reference/parserGenericsInTypeContexts2.js
@@ -26,7 +26,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserRealSource10.js b/tests/baselines/reference/parserRealSource10.js
index 255cad3ca21aa..429a388c894b2 100644
--- a/tests/baselines/reference/parserRealSource10.js
+++ b/tests/baselines/reference/parserRealSource10.js
@@ -826,7 +826,8 @@ var TypeScript;
     var NumberLiteralToken = (function (_super) {
         __extends(NumberLiteralToken, _super);
         function NumberLiteralToken(value, hasEmptyFraction) {
-            _super.call(this, TokenID.NumberLiteral);
+            var _this;
+            _this = _super.call(this, TokenID.NumberLiteral) || this;
             this.value = value;
             this.hasEmptyFraction = hasEmptyFraction;
         }
@@ -842,7 +843,8 @@ var TypeScript;
     var StringLiteralToken = (function (_super) {
         __extends(StringLiteralToken, _super);
         function StringLiteralToken(value) {
-            _super.call(this, TokenID.StringLiteral);
+            var _this;
+            _this = _super.call(this, TokenID.StringLiteral) || this;
             this.value = value;
         }
         StringLiteralToken.prototype.getText = function () {
@@ -857,7 +859,8 @@ var TypeScript;
     var IdentifierToken = (function (_super) {
         __extends(IdentifierToken, _super);
         function IdentifierToken(value, hasEscapeSequence) {
-            _super.call(this, TokenID.Identifier);
+            var _this;
+            _this = _super.call(this, TokenID.Identifier) || this;
             this.value = value;
             this.hasEscapeSequence = hasEscapeSequence;
         }
@@ -873,7 +876,8 @@ var TypeScript;
     var WhitespaceToken = (function (_super) {
         __extends(WhitespaceToken, _super);
         function WhitespaceToken(tokenId, value) {
-            _super.call(this, tokenId);
+            var _this;
+            _this = _super.call(this, tokenId) || this;
             this.value = value;
         }
         WhitespaceToken.prototype.getText = function () {
@@ -888,7 +892,8 @@ var TypeScript;
     var CommentToken = (function (_super) {
         __extends(CommentToken, _super);
         function CommentToken(tokenID, value, isBlock, startPos, line, endsLine) {
-            _super.call(this, tokenID);
+            var _this;
+            _this = _super.call(this, tokenID) || this;
             this.value = value;
             this.isBlock = isBlock;
             this.startPos = startPos;
@@ -907,7 +912,8 @@ var TypeScript;
     var RegularExpressionLiteralToken = (function (_super) {
         __extends(RegularExpressionLiteralToken, _super);
         function RegularExpressionLiteralToken(regex) {
-            _super.call(this, TokenID.RegularExpressionLiteral);
+            var _this;
+            _this = _super.call(this, TokenID.RegularExpressionLiteral) || this;
             this.regex = regex;
         }
         RegularExpressionLiteralToken.prototype.getText = function () {
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index 0c1d106425564..4be1ed2076762 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2386,7 +2386,8 @@ var TypeScript;
     var AST = (function (_super) {
         __extends(AST, _super);
         function AST(nodeType) {
-            _super.call(this);
+            var _this;
+            _this = _super.call(this) || this;
             this.nodeType = nodeType;
             this.type = null;
             this.flags = ASTFlags.Writeable;
@@ -2542,7 +2543,8 @@ var TypeScript;
     var IncompleteAST = (function (_super) {
         __extends(IncompleteAST, _super);
         function IncompleteAST(min, lim) {
-            _super.call(this, NodeType.Error);
+            var _this;
+            _this = _super.call(this, NodeType.Error) || this;
             this.minChar = min;
             this.limChar = lim;
         }
@@ -2552,7 +2554,8 @@ var TypeScript;
     var ASTList = (function (_super) {
         __extends(ASTList, _super);
         function ASTList() {
-            _super.call(this, NodeType.List);
+            var _this;
+            _this = _super.call(this, NodeType.List) || this;
             this.enclosingScope = null;
             this.members = new AST[];
         }
@@ -2619,7 +2622,8 @@ var TypeScript;
         //    To change text, and to avoid running into a situation where 'actualText' does not 
         //    match 'text', always use setText.
         function Identifier(actualText, hasEscapeSequence) {
-            _super.call(this, NodeType.Name);
+            var _this;
+            _this = _super.call(this, NodeType.Name) || this;
             this.actualText = actualText;
             this.hasEscapeSequence = hasEscapeSequence;
             this.sym = null;
@@ -2663,7 +2667,8 @@ var TypeScript;
     var MissingIdentifier = (function (_super) {
         __extends(MissingIdentifier, _super);
         function MissingIdentifier() {
-            _super.call(this, "__missing");
+            var _this;
+            _this = _super.call(this, "__missing") || this;
         }
         MissingIdentifier.prototype.isMissing = function () {
             return true;
@@ -2677,7 +2682,8 @@ var TypeScript;
     var Label = (function (_super) {
         __extends(Label, _super);
         function Label(id) {
-            _super.call(this, NodeType.Label);
+            var _this;
+            _this = _super.call(this, NodeType.Label) || this;
             this.id = id;
         }
         Label.prototype.printLabel = function () { return this.id.actualText + ":"; };
@@ -2701,7 +2707,8 @@ var TypeScript;
     var Expression = (function (_super) {
         __extends(Expression, _super);
         function Expression(nodeType) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
         }
         Expression.prototype.isExpression = function () { return true; };
         Expression.prototype.isStatementOrExpression = function () { return true; };
@@ -2711,7 +2718,8 @@ var TypeScript;
     var UnaryExpression = (function (_super) {
         __extends(UnaryExpression, _super);
         function UnaryExpression(nodeType, operand) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.operand = operand;
             this.targetType = null; // Target type for an object literal (null if no target type)
             this.castTerm = null;
@@ -2855,7 +2863,8 @@ var TypeScript;
     var CallExpression = (function (_super) {
         __extends(CallExpression, _super);
         function CallExpression(nodeType, target, arguments) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.target = target;
             this.arguments = arguments;
             this.signature = null;
@@ -2887,7 +2896,8 @@ var TypeScript;
     var BinaryExpression = (function (_super) {
         __extends(BinaryExpression, _super);
         function BinaryExpression(nodeType, operand1, operand2) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.operand1 = operand1;
             this.operand2 = operand2;
         }
@@ -3039,7 +3049,8 @@ var TypeScript;
     var ConditionalExpression = (function (_super) {
         __extends(ConditionalExpression, _super);
         function ConditionalExpression(operand1, operand2, operand3) {
-            _super.call(this, NodeType.ConditionalExpression);
+            var _this;
+            _this = _super.call(this, NodeType.ConditionalExpression) || this;
             this.operand1 = operand1;
             this.operand2 = operand2;
             this.operand3 = operand3;
@@ -3064,7 +3075,8 @@ var TypeScript;
     var NumberLiteral = (function (_super) {
         __extends(NumberLiteral, _super);
         function NumberLiteral(value, hasEmptyFraction) {
-            _super.call(this, NodeType.NumberLit);
+            var _this;
+            _this = _super.call(this, NodeType.NumberLit) || this;
             this.value = value;
             this.hasEmptyFraction = hasEmptyFraction;
             this.isNegativeZero = false;
@@ -3105,7 +3117,8 @@ var TypeScript;
     var RegexLiteral = (function (_super) {
         __extends(RegexLiteral, _super);
         function RegexLiteral(regex) {
-            _super.call(this, NodeType.Regex);
+            var _this;
+            _this = _super.call(this, NodeType.Regex) || this;
             this.regex = regex;
         }
         RegexLiteral.prototype.typeCheck = function (typeFlow) {
@@ -3125,7 +3138,8 @@ var TypeScript;
     var StringLiteral = (function (_super) {
         __extends(StringLiteral, _super);
         function StringLiteral(text) {
-            _super.call(this, NodeType.QString);
+            var _this;
+            _this = _super.call(this, NodeType.QString) || this;
             this.text = text;
         }
         StringLiteral.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3151,7 +3165,8 @@ var TypeScript;
     var ModuleElement = (function (_super) {
         __extends(ModuleElement, _super);
         function ModuleElement(nodeType) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
         }
         return ModuleElement;
     }(AST));
@@ -3159,7 +3174,8 @@ var TypeScript;
     var ImportDeclaration = (function (_super) {
         __extends(ImportDeclaration, _super);
         function ImportDeclaration(id, alias) {
-            _super.call(this, NodeType.ImportDeclaration);
+            var _this;
+            _this = _super.call(this, NodeType.ImportDeclaration) || this;
             this.id = id;
             this.alias = alias;
             this.varFlags = VarFlags.None;
@@ -3218,7 +3234,8 @@ var TypeScript;
     var BoundDecl = (function (_super) {
         __extends(BoundDecl, _super);
         function BoundDecl(id, nodeType, nestingLevel) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.id = id;
             this.nestingLevel = nestingLevel;
             this.init = null;
@@ -3242,7 +3259,8 @@ var TypeScript;
     var VarDecl = (function (_super) {
         __extends(VarDecl, _super);
         function VarDecl(id, nest) {
-            _super.call(this, id, NodeType.VarDecl, nest);
+            var _this;
+            _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
         }
         VarDecl.prototype.isAmbient = function () { return hasFlag(this.varFlags, VarFlags.Ambient); };
         VarDecl.prototype.isExported = function () { return hasFlag(this.varFlags, VarFlags.Exported); };
@@ -3259,7 +3277,8 @@ var TypeScript;
     var ArgDecl = (function (_super) {
         __extends(ArgDecl, _super);
         function ArgDecl(id) {
-            _super.call(this, id, NodeType.ArgDecl, 0);
+            var _this;
+            _this = _super.call(this, id, NodeType.ArgDecl, 0) || this;
             this.isOptional = false;
             this.parameterPropertySym = null;
         }
@@ -3281,7 +3300,8 @@ var TypeScript;
     var FuncDecl = (function (_super) {
         __extends(FuncDecl, _super);
         function FuncDecl(name, bod, isConstructor, arguments, vars, scopes, statics, nodeType) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.name = name;
             this.bod = bod;
             this.isConstructor = isConstructor;
@@ -3421,7 +3441,8 @@ var TypeScript;
     var Script = (function (_super) {
         __extends(Script, _super);
         function Script(vars, scopes) {
-            _super.call(this, new Identifier("script"), null, false, null, vars, scopes, null, NodeType.Script);
+            var _this;
+            _this = _super.call(this, new Identifier("script"), null, false, null, vars, scopes, null, NodeType.Script) || this;
             this.locationInfo = null;
             this.referencedFiles = [];
             this.requiresGlobal = false;
@@ -3490,7 +3511,8 @@ var TypeScript;
     var NamedDeclaration = (function (_super) {
         __extends(NamedDeclaration, _super);
         function NamedDeclaration(nodeType, name, members) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.name = name;
             this.members = members;
             this.leftCurlyCount = 0;
@@ -3502,7 +3524,8 @@ var TypeScript;
     var ModuleDeclaration = (function (_super) {
         __extends(ModuleDeclaration, _super);
         function ModuleDeclaration(name, members, vars, scopes, endingToken) {
-            _super.call(this, NodeType.ModuleDeclaration, name, members);
+            var _this;
+            _this = _super.call(this, NodeType.ModuleDeclaration, name, members) || this;
             this.endingToken = endingToken;
             this.modFlags = ModuleFlags.ShouldEmitModuleDecl;
             this.amdDependencies = [];
@@ -3537,7 +3560,8 @@ var TypeScript;
     var TypeDeclaration = (function (_super) {
         __extends(TypeDeclaration, _super);
         function TypeDeclaration(nodeType, name, extendsList, implementsList, members) {
-            _super.call(this, nodeType, name, members);
+            var _this;
+            _this = _super.call(this, nodeType, name, members) || this;
             this.extendsList = extendsList;
             this.implementsList = implementsList;
             this.varFlags = VarFlags.None;
@@ -3554,7 +3578,8 @@ var TypeScript;
     var ClassDeclaration = (function (_super) {
         __extends(ClassDeclaration, _super);
         function ClassDeclaration(name, members, extendsList, implementsList) {
-            _super.call(this, NodeType.ClassDeclaration, name, extendsList, implementsList, members);
+            var _this;
+            _this = _super.call(this, NodeType.ClassDeclaration, name, extendsList, implementsList, members) || this;
             this.knownMemberNames = {};
             this.constructorDecl = null;
             this.constructorNestingLevel = 0;
@@ -3572,7 +3597,8 @@ var TypeScript;
     var InterfaceDeclaration = (function (_super) {
         __extends(InterfaceDeclaration, _super);
         function InterfaceDeclaration(name, members, extendsList, implementsList) {
-            _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members);
+            var _this;
+            _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
         }
         InterfaceDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckInterface(this);
@@ -3585,7 +3611,8 @@ var TypeScript;
     var Statement = (function (_super) {
         __extends(Statement, _super);
         function Statement(nodeType) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.flags |= ASTFlags.IsStatement;
         }
         Statement.prototype.isLoop = function () { return false; };
@@ -3601,7 +3628,8 @@ var TypeScript;
     var LabeledStatement = (function (_super) {
         __extends(LabeledStatement, _super);
         function LabeledStatement(labels, stmt) {
-            _super.call(this, NodeType.LabeledStatement);
+            var _this;
+            _this = _super.call(this, NodeType.LabeledStatement) || this;
             this.labels = labels;
             this.stmt = stmt;
         }
@@ -3635,7 +3663,8 @@ var TypeScript;
     var Block = (function (_super) {
         __extends(Block, _super);
         function Block(statements, isStatementBlock) {
-            _super.call(this, NodeType.Block);
+            var _this;
+            _this = _super.call(this, NodeType.Block) || this;
             this.statements = statements;
             this.isStatementBlock = isStatementBlock;
         }
@@ -3690,7 +3719,8 @@ var TypeScript;
     var Jump = (function (_super) {
         __extends(Jump, _super);
         function Jump(nodeType) {
-            _super.call(this, nodeType);
+            var _this;
+            _this = _super.call(this, nodeType) || this;
             this.target = null;
             this.resolvedTarget = null;
         }
@@ -3741,7 +3771,8 @@ var TypeScript;
     var WhileStatement = (function (_super) {
         __extends(WhileStatement, _super);
         function WhileStatement(cond) {
-            _super.call(this, NodeType.While);
+            var _this;
+            _this = _super.call(this, NodeType.While) || this;
             this.cond = cond;
             this.body = null;
         }
@@ -3793,7 +3824,8 @@ var TypeScript;
     var DoWhileStatement = (function (_super) {
         __extends(DoWhileStatement, _super);
         function DoWhileStatement() {
-            _super.call(this, NodeType.DoWhile);
+            var _this;
+            _this = _super.call(this, NodeType.DoWhile) || this;
             this.body = null;
             this.whileAST = null;
             this.cond = null;
@@ -3849,7 +3881,8 @@ var TypeScript;
     var IfStatement = (function (_super) {
         __extends(IfStatement, _super);
         function IfStatement(cond) {
-            _super.call(this, NodeType.If);
+            var _this;
+            _this = _super.call(this, NodeType.If) || this;
             this.cond = cond;
             this.elseBod = null;
             this.statement = new ASTSpan();
@@ -3927,7 +3960,8 @@ var TypeScript;
     var ReturnStatement = (function (_super) {
         __extends(ReturnStatement, _super);
         function ReturnStatement() {
-            _super.call(this, NodeType.Return);
+            var _this;
+            _this = _super.call(this, NodeType.Return) || this;
             this.returnExpression = null;
         }
         ReturnStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3958,7 +3992,8 @@ var TypeScript;
     var EndCode = (function (_super) {
         __extends(EndCode, _super);
         function EndCode() {
-            _super.call(this, NodeType.EndCode);
+            var _this;
+            _this = _super.call(this, NodeType.EndCode) || this;
         }
         return EndCode;
     }(AST));
@@ -3966,7 +4001,8 @@ var TypeScript;
     var ForInStatement = (function (_super) {
         __extends(ForInStatement, _super);
         function ForInStatement(lval, obj) {
-            _super.call(this, NodeType.ForIn);
+            var _this;
+            _this = _super.call(this, NodeType.ForIn) || this;
             this.lval = lval;
             this.obj = obj;
             this.statement = new ASTSpan();
@@ -4081,7 +4117,8 @@ var TypeScript;
     var ForStatement = (function (_super) {
         __extends(ForStatement, _super);
         function ForStatement(init) {
-            _super.call(this, NodeType.For);
+            var _this;
+            _this = _super.call(this, NodeType.For) || this;
             this.init = init;
         }
         ForStatement.prototype.isLoop = function () { return true; };
@@ -4172,7 +4209,8 @@ var TypeScript;
     var WithStatement = (function (_super) {
         __extends(WithStatement, _super);
         function WithStatement(expr) {
-            _super.call(this, NodeType.With);
+            var _this;
+            _this = _super.call(this, NodeType.With) || this;
             this.expr = expr;
             this.withSym = null;
         }
@@ -4198,7 +4236,8 @@ var TypeScript;
     var SwitchStatement = (function (_super) {
         __extends(SwitchStatement, _super);
         function SwitchStatement(val) {
-            _super.call(this, NodeType.Switch);
+            var _this;
+            _this = _super.call(this, NodeType.Switch) || this;
             this.val = val;
             this.defaultCase = null;
             this.statement = new ASTSpan();
@@ -4270,7 +4309,8 @@ var TypeScript;
     var CaseStatement = (function (_super) {
         __extends(CaseStatement, _super);
         function CaseStatement() {
-            _super.call(this, NodeType.Case);
+            var _this;
+            _this = _super.call(this, NodeType.Case) || this;
             this.expr = null;
         }
         CaseStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4323,7 +4363,8 @@ var TypeScript;
     var TypeReference = (function (_super) {
         __extends(TypeReference, _super);
         function TypeReference(term, arrayCount) {
-            _super.call(this, NodeType.TypeRef);
+            var _this;
+            _this = _super.call(this, NodeType.TypeRef) || this;
             this.term = term;
             this.arrayCount = arrayCount;
         }
@@ -4353,7 +4394,8 @@ var TypeScript;
     var TryFinally = (function (_super) {
         __extends(TryFinally, _super);
         function TryFinally(tryNode, finallyNode) {
-            _super.call(this, NodeType.TryFinally);
+            var _this;
+            _this = _super.call(this, NodeType.TryFinally) || this;
             this.tryNode = tryNode;
             this.finallyNode = finallyNode;
         }
@@ -4398,7 +4440,8 @@ var TypeScript;
     var TryCatch = (function (_super) {
         __extends(TryCatch, _super);
         function TryCatch(tryNode, catchNode) {
-            _super.call(this, NodeType.TryCatch);
+            var _this;
+            _this = _super.call(this, NodeType.TryCatch) || this;
             this.tryNode = tryNode;
             this.catchNode = catchNode;
         }
@@ -4448,7 +4491,8 @@ var TypeScript;
     var Try = (function (_super) {
         __extends(Try, _super);
         function Try(body) {
-            _super.call(this, NodeType.Try);
+            var _this;
+            _this = _super.call(this, NodeType.Try) || this;
             this.body = body;
         }
         Try.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4476,7 +4520,8 @@ var TypeScript;
     var Catch = (function (_super) {
         __extends(Catch, _super);
         function Catch(param, body) {
-            _super.call(this, NodeType.Catch);
+            var _this;
+            _this = _super.call(this, NodeType.Catch) || this;
             this.param = param;
             this.body = body;
             this.statement = new ASTSpan();
@@ -4549,7 +4594,8 @@ var TypeScript;
     var Finally = (function (_super) {
         __extends(Finally, _super);
         function Finally(body) {
-            _super.call(this, NodeType.Finally);
+            var _this;
+            _this = _super.call(this, NodeType.Finally) || this;
             this.body = body;
         }
         Finally.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4577,7 +4623,8 @@ var TypeScript;
     var Comment = (function (_super) {
         __extends(Comment, _super);
         function Comment(content, isBlockComment, endsLine) {
-            _super.call(this, NodeType.Comment);
+            var _this;
+            _this = _super.call(this, NodeType.Comment) || this;
             this.content = content;
             this.isBlockComment = isBlockComment;
             this.endsLine = endsLine;
@@ -4603,7 +4650,8 @@ var TypeScript;
     var DebuggerStatement = (function (_super) {
         __extends(DebuggerStatement, _super);
         function DebuggerStatement() {
-            _super.call(this, NodeType.Debugger);
+            var _this;
+            _this = _super.call(this, NodeType.Debugger) || this;
         }
         DebuggerStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index 1a525c49d197f..3f7e05e7164c9 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2380,7 +2380,8 @@ var Harness;
     var TestCase = (function (_super) {
         __extends(TestCase, _super);
         function TestCase(description, block) {
-            _super.call(this, description, block);
+            var _this;
+            _this = _super.call(this, description, block) || this;
             this.description = description;
             this.block = block;
         }
@@ -2414,7 +2415,8 @@ var Harness;
     var Scenario = (function (_super) {
         __extends(Scenario, _super);
         function Scenario(description, block) {
-            _super.call(this, description, block);
+            var _this;
+            _this = _super.call(this, description, block) || this;
             this.description = description;
             this.block = block;
         }
@@ -2469,7 +2471,8 @@ var Harness;
     var Run = (function (_super) {
         __extends(Run, _super);
         function Run() {
-            _super.call(this, 'Test Run', null);
+            var _this;
+            _this = _super.call(this, 'Test Run', null) || this;
         }
         Run.prototype.run = function () {
             emitLog('start');
diff --git a/tests/baselines/reference/primitiveMembers.js b/tests/baselines/reference/primitiveMembers.js
index caf41fe27086a..5425696b13344 100644
--- a/tests/baselines/reference/primitiveMembers.js
+++ b/tests/baselines/reference/primitiveMembers.js
@@ -63,7 +63,8 @@ var baz = (function () {
 var foo = (function (_super) {
     __extends(foo, _super);
     function foo() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     foo.prototype.bar = function () { return undefined; };
     ;
diff --git a/tests/baselines/reference/privacyClass.js b/tests/baselines/reference/privacyClass.js
index a149aa26f7529..8181d0612a846 100644
--- a/tests/baselines/reference/privacyClass.js
+++ b/tests/baselines/reference/privacyClass.js
@@ -152,21 +152,24 @@ var m1;
     var m1_C1_private = (function (_super) {
         __extends(m1_C1_private, _super);
         function m1_C1_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C1_private;
     }(m1_c_public));
     var m1_C2_private = (function (_super) {
         __extends(m1_C2_private, _super);
         function m1_C2_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C2_private;
     }(m1_c_private));
     var m1_C3_public = (function (_super) {
         __extends(m1_C3_public, _super);
         function m1_C3_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C3_public;
     }(m1_c_public));
@@ -174,7 +177,8 @@ var m1;
     var m1_C4_public = (function (_super) {
         __extends(m1_C4_public, _super);
         function m1_C4_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C4_public;
     }(m1_c_private));
@@ -204,21 +208,24 @@ var m1;
     var m1_C9_private = (function (_super) {
         __extends(m1_C9_private, _super);
         function m1_C9_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C9_private;
     }(m1_c_public));
     var m1_C10_private = (function (_super) {
         __extends(m1_C10_private, _super);
         function m1_C10_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C10_private;
     }(m1_c_private));
     var m1_C11_public = (function (_super) {
         __extends(m1_C11_public, _super);
         function m1_C11_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C11_public;
     }(m1_c_public));
@@ -226,7 +233,8 @@ var m1;
     var m1_C12_public = (function (_super) {
         __extends(m1_C12_public, _super);
         function m1_C12_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C12_public;
     }(m1_c_private));
@@ -250,21 +258,24 @@ var m2;
     var m2_C1_private = (function (_super) {
         __extends(m2_C1_private, _super);
         function m2_C1_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C1_private;
     }(m2_c_public));
     var m2_C2_private = (function (_super) {
         __extends(m2_C2_private, _super);
         function m2_C2_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C2_private;
     }(m2_c_private));
     var m2_C3_public = (function (_super) {
         __extends(m2_C3_public, _super);
         function m2_C3_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C3_public;
     }(m2_c_public));
@@ -272,7 +283,8 @@ var m2;
     var m2_C4_public = (function (_super) {
         __extends(m2_C4_public, _super);
         function m2_C4_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C4_public;
     }(m2_c_private));
@@ -302,21 +314,24 @@ var m2;
     var m2_C9_private = (function (_super) {
         __extends(m2_C9_private, _super);
         function m2_C9_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C9_private;
     }(m2_c_public));
     var m2_C10_private = (function (_super) {
         __extends(m2_C10_private, _super);
         function m2_C10_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C10_private;
     }(m2_c_private));
     var m2_C11_public = (function (_super) {
         __extends(m2_C11_public, _super);
         function m2_C11_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C11_public;
     }(m2_c_public));
@@ -324,7 +339,8 @@ var m2;
     var m2_C12_public = (function (_super) {
         __extends(m2_C12_public, _super);
         function m2_C12_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m2_C12_public;
     }(m2_c_private));
@@ -346,21 +362,24 @@ var glo_c_private = (function () {
 var glo_C1_private = (function (_super) {
     __extends(glo_C1_private, _super);
     function glo_C1_private() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C1_private;
 }(glo_c_public));
 var glo_C2_private = (function (_super) {
     __extends(glo_C2_private, _super);
     function glo_C2_private() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C2_private;
 }(glo_c_private));
 var glo_C3_public = (function (_super) {
     __extends(glo_C3_public, _super);
     function glo_C3_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C3_public;
 }(glo_c_public));
@@ -368,7 +387,8 @@ exports.glo_C3_public = glo_C3_public;
 var glo_C4_public = (function (_super) {
     __extends(glo_C4_public, _super);
     function glo_C4_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C4_public;
 }(glo_c_private));
@@ -398,21 +418,24 @@ exports.glo_C8_public = glo_C8_public;
 var glo_C9_private = (function (_super) {
     __extends(glo_C9_private, _super);
     function glo_C9_private() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C9_private;
 }(glo_c_public));
 var glo_C10_private = (function (_super) {
     __extends(glo_C10_private, _super);
     function glo_C10_private() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C10_private;
 }(glo_c_private));
 var glo_C11_public = (function (_super) {
     __extends(glo_C11_public, _super);
     function glo_C11_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C11_public;
 }(glo_c_public));
@@ -420,7 +443,8 @@ exports.glo_C11_public = glo_C11_public;
 var glo_C12_public = (function (_super) {
     __extends(glo_C12_public, _super);
     function glo_C12_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C12_public;
 }(glo_c_private));
diff --git a/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js b/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
index e2bb58781dec0..fe3ae6ba6d0f3 100644
--- a/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
+++ b/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
@@ -122,21 +122,24 @@ var publicModule;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
@@ -144,7 +147,8 @@ var publicModule;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
@@ -152,14 +156,16 @@ var publicModule;
     var privateClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(privateClassExtendingFromPrivateModuleClass, _super);
         function privateClassExtendingFromPrivateModuleClass() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
     var publicClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(publicClassExtendingFromPrivateModuleClass, _super);
         function publicClassExtendingFromPrivateModuleClass() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
@@ -183,21 +189,24 @@ var privateModule;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPrivateModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPrivateModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPrivateModule));
@@ -205,7 +214,8 @@ var privateModule;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPrivateModule));
@@ -213,14 +223,16 @@ var privateModule;
     var privateClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(privateClassExtendingFromPrivateModuleClass, _super);
         function privateClassExtendingFromPrivateModuleClass() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
     var publicClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(publicClassExtendingFromPrivateModuleClass, _super);
         function publicClassExtendingFromPrivateModuleClass() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
@@ -242,21 +254,24 @@ var privateClass = (function () {
 var privateClassExtendingPublicClass = (function (_super) {
     __extends(privateClassExtendingPublicClass, _super);
     function privateClassExtendingPublicClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return privateClassExtendingPublicClass;
 }(publicClass));
 var privateClassExtendingPrivateClassInModule = (function (_super) {
     __extends(privateClassExtendingPrivateClassInModule, _super);
     function privateClassExtendingPrivateClassInModule() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return privateClassExtendingPrivateClassInModule;
 }(privateClass));
 var publicClassExtendingPublicClass = (function (_super) {
     __extends(publicClassExtendingPublicClass, _super);
     function publicClassExtendingPublicClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return publicClassExtendingPublicClass;
 }(publicClass));
@@ -264,7 +279,8 @@ exports.publicClassExtendingPublicClass = publicClassExtendingPublicClass;
 var publicClassExtendingPrivateClass = (function (_super) {
     __extends(publicClassExtendingPrivateClass, _super);
     function publicClassExtendingPrivateClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return publicClassExtendingPrivateClass;
 }(privateClass));
@@ -272,14 +288,16 @@ exports.publicClassExtendingPrivateClass = publicClassExtendingPrivateClass;
 var privateClassExtendingFromPrivateModuleClass = (function (_super) {
     __extends(privateClassExtendingFromPrivateModuleClass, _super);
     function privateClassExtendingFromPrivateModuleClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return privateClassExtendingFromPrivateModuleClass;
 }(privateModule.publicClassInPrivateModule));
 var publicClassExtendingFromPrivateModuleClass = (function (_super) {
     __extends(publicClassExtendingFromPrivateModuleClass, _super);
     function publicClassExtendingFromPrivateModuleClass() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return publicClassExtendingFromPrivateModuleClass;
 }(privateModule.publicClassInPrivateModule));
@@ -308,21 +326,24 @@ var publicModuleInGlobal;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
@@ -330,7 +351,8 @@ var publicModuleInGlobal;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
@@ -344,7 +366,8 @@ var publicClassInGlobal = (function () {
 var publicClassExtendingPublicClassInGlobal = (function (_super) {
     __extends(publicClassExtendingPublicClassInGlobal, _super);
     function publicClassExtendingPublicClassInGlobal() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return publicClassExtendingPublicClassInGlobal;
 }(publicClassInGlobal));
diff --git a/tests/baselines/reference/privacyGloClass.js b/tests/baselines/reference/privacyGloClass.js
index e8c8c447cf9f9..481a39219212f 100644
--- a/tests/baselines/reference/privacyGloClass.js
+++ b/tests/baselines/reference/privacyGloClass.js
@@ -84,21 +84,24 @@ var m1;
     var m1_C1_private = (function (_super) {
         __extends(m1_C1_private, _super);
         function m1_C1_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C1_private;
     }(m1_c_public));
     var m1_C2_private = (function (_super) {
         __extends(m1_C2_private, _super);
         function m1_C2_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C2_private;
     }(m1_c_private));
     var m1_C3_public = (function (_super) {
         __extends(m1_C3_public, _super);
         function m1_C3_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C3_public;
     }(m1_c_public));
@@ -106,7 +109,8 @@ var m1;
     var m1_C4_public = (function (_super) {
         __extends(m1_C4_public, _super);
         function m1_C4_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C4_public;
     }(m1_c_private));
@@ -136,21 +140,24 @@ var m1;
     var m1_C9_private = (function (_super) {
         __extends(m1_C9_private, _super);
         function m1_C9_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C9_private;
     }(m1_c_public));
     var m1_C10_private = (function (_super) {
         __extends(m1_C10_private, _super);
         function m1_C10_private() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C10_private;
     }(m1_c_private));
     var m1_C11_public = (function (_super) {
         __extends(m1_C11_public, _super);
         function m1_C11_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C11_public;
     }(m1_c_public));
@@ -158,7 +165,8 @@ var m1;
     var m1_C12_public = (function (_super) {
         __extends(m1_C12_public, _super);
         function m1_C12_public() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return m1_C12_public;
     }(m1_c_private));
@@ -174,7 +182,8 @@ var glo_c_public = (function () {
 var glo_C3_public = (function (_super) {
     __extends(glo_C3_public, _super);
     function glo_C3_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C3_public;
 }(glo_c_public));
@@ -186,7 +195,8 @@ var glo_C7_public = (function () {
 var glo_C11_public = (function (_super) {
     __extends(glo_C11_public, _super);
     function glo_C11_public() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return glo_C11_public;
 }(glo_c_public));
diff --git a/tests/baselines/reference/privateAccessInSubclass1.js b/tests/baselines/reference/privateAccessInSubclass1.js
index 188c3149fd03a..ca432ee7ab76b 100644
--- a/tests/baselines/reference/privateAccessInSubclass1.js
+++ b/tests/baselines/reference/privateAccessInSubclass1.js
@@ -23,7 +23,8 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.myMethod = function () {
         this.options;
diff --git a/tests/baselines/reference/privateInstanceMemberAccessibility.js b/tests/baselines/reference/privateInstanceMemberAccessibility.js
index 8fbe5121136fb..cfdc137aedff9 100644
--- a/tests/baselines/reference/privateInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/privateInstanceMemberAccessibility.js
@@ -27,7 +27,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.x = _super.prototype.foo; // error
         this.z = _super.prototype.foo; // error
     }
diff --git a/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js b/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
index 058a6ba1b6544..8b516a5a19c79 100644
--- a/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
+++ b/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
@@ -40,7 +40,8 @@ var K = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.prototype.m2 = function () {
         var a = this.priv; // error
diff --git a/tests/baselines/reference/privateStaticMemberAccessibility.js b/tests/baselines/reference/privateStaticMemberAccessibility.js
index 352256ac9bd66..aad41d01b075f 100644
--- a/tests/baselines/reference/privateStaticMemberAccessibility.js
+++ b/tests/baselines/reference/privateStaticMemberAccessibility.js
@@ -22,7 +22,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.bing = function () { return Base.foo; }; // error
     }
     return Derived;
diff --git a/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js b/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
index 7ed6f3d679266..44adec751bf08 100644
--- a/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
+++ b/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
@@ -29,7 +29,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
index 3b6e407d045c0..ed9768b06c292 100644
--- a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
+++ b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
@@ -14,7 +14,8 @@ var m2;
     var class1 = (function (_super) {
         __extends(class1, _super);
         function class1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class1;
     }(m2.mExported.me.class1));
@@ -27,7 +28,8 @@ var m2;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class2;
     }(m2.mExported.me.class1));
@@ -40,7 +42,8 @@ var m2;
     var class3 = (function (_super) {
         __extends(class3, _super);
         function class3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class3;
     }(mNonExported.mne.class1));
@@ -53,7 +56,8 @@ var m2;
     var class4 = (function (_super) {
         __extends(class4, _super);
         function class4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class4;
     }(mNonExported.mne.class1));
diff --git a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
index 3b6e407d045c0..ed9768b06c292 100644
--- a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
+++ b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
@@ -14,7 +14,8 @@ var m2;
     var class1 = (function (_super) {
         __extends(class1, _super);
         function class1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class1;
     }(m2.mExported.me.class1));
@@ -27,7 +28,8 @@ var m2;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class2;
     }(m2.mExported.me.class1));
@@ -40,7 +42,8 @@ var m2;
     var class3 = (function (_super) {
         __extends(class3, _super);
         function class3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class3;
     }(mNonExported.mne.class1));
@@ -53,7 +56,8 @@ var m2;
     var class4 = (function (_super) {
         __extends(class4, _super);
         function class4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class4;
     }(mNonExported.mne.class1));
diff --git a/tests/baselines/reference/project/prologueEmit/amd/out.js b/tests/baselines/reference/project/prologueEmit/amd/out.js
index 6a07c9a92ca1c..deb734487949b 100644
--- a/tests/baselines/reference/project/prologueEmit/amd/out.js
+++ b/tests/baselines/reference/project/prologueEmit/amd/out.js
@@ -18,7 +18,8 @@ var m;
     var child = (function (_super) {
         __extends(child, _super);
         function child() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return child;
     }(base));
diff --git a/tests/baselines/reference/project/prologueEmit/node/out.js b/tests/baselines/reference/project/prologueEmit/node/out.js
index 6a07c9a92ca1c..deb734487949b 100644
--- a/tests/baselines/reference/project/prologueEmit/node/out.js
+++ b/tests/baselines/reference/project/prologueEmit/node/out.js
@@ -18,7 +18,8 @@ var m;
     var child = (function (_super) {
         __extends(child, _super);
         function child() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return child;
     }(base));
diff --git a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
index 64a207a7cad2c..b5147a28919d4 100644
--- a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
+++ b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
@@ -7,7 +7,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ClassC = (function (_super) {
     __extends(ClassC, _super);
     function ClassC() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ClassC;
 }(test.ClassA));
diff --git a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
index 64a207a7cad2c..b5147a28919d4 100644
--- a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
+++ b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
@@ -7,7 +7,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ClassC = (function (_super) {
     __extends(ClassC, _super);
     function ClassC() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ClassC;
 }(test.ClassA));
diff --git a/tests/baselines/reference/propertiesAndIndexers.js b/tests/baselines/reference/propertiesAndIndexers.js
index 591c4760e58ee..a22f966375414 100644
--- a/tests/baselines/reference/propertiesAndIndexers.js
+++ b/tests/baselines/reference/propertiesAndIndexers.js
@@ -65,7 +65,8 @@ var P = (function () {
 var Q = (function (_super) {
     __extends(Q, _super);
     function Q() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Q;
 }(P));
diff --git a/tests/baselines/reference/propertyAccess.js b/tests/baselines/reference/propertyAccess.js
index 2dbb316d84852..31b90bcf7ac2b 100644
--- a/tests/baselines/reference/propertyAccess.js
+++ b/tests/baselines/reference/propertyAccess.js
@@ -164,7 +164,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
index bbd2def2206cb..c570642a1ba3e 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
@@ -97,7 +97,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
index 76da06166d4f8..aebdc2c3ce30e 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
@@ -72,7 +72,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
index c49153c59b066..442ae29e27883 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
@@ -59,7 +59,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
index 255c05ac3ac93..40a1365b7e1c7 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
@@ -52,7 +52,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(C.prototype, "y", {
         get: function () { return this.x; },
@@ -93,7 +94,8 @@ var C = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return E;
 }(C));
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
index 02ad29bd31285..e6c768a67592c 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
@@ -147,7 +147,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.method1 = function () {
         var B = (function () {
@@ -173,7 +174,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.method2 = function () {
         var C = (function () {
@@ -199,7 +201,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.method3 = function () {
         var D = (function () {
@@ -225,7 +228,8 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived4.prototype.method4 = function () {
         var E = (function () {
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
index a87f67e15f288..3f46b69ecf35d 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
@@ -34,7 +34,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(C.prototype, "y", {
         get: function () { return this.x; },
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
index 05dc85e251e1d..44a4fbdf284c3 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
@@ -120,7 +120,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.method1 = function () {
         var b;
@@ -139,7 +140,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.prototype.method2 = function () {
         var b;
@@ -158,7 +160,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.prototype.method3 = function () {
         var b;
@@ -177,7 +180,8 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived4.prototype.method4 = function () {
         var b;
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
index 6675589226e93..4cc09bac99d15 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
@@ -30,7 +30,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.method1 = function () {
         this.x; // OK, accessed within a subclass of the declaring class
diff --git a/tests/baselines/reference/protectedInstanceMemberAccessibility.js b/tests/baselines/reference/protectedInstanceMemberAccessibility.js
index eba89aac28ee8..003e2f50e6f8f 100644
--- a/tests/baselines/reference/protectedInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/protectedInstanceMemberAccessibility.js
@@ -61,7 +61,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.g = function () {
         var t1 = this.x;
@@ -93,7 +94,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/protectedMembers.js b/tests/baselines/reference/protectedMembers.js
index dcc68e0c946c4..984527b2c0d2b 100644
--- a/tests/baselines/reference/protectedMembers.js
+++ b/tests/baselines/reference/protectedMembers.js
@@ -137,7 +137,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C2.prototype.f = function () {
         return _super.prototype.f.call(this) + this.x;
@@ -151,7 +152,8 @@ var C2 = (function (_super) {
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C3.prototype.f = function () {
         return _super.prototype.f.call(this);
@@ -187,14 +189,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     C.foo = function (a, b, c, d, e) {
         a.x = 1; // Error, access must be through C or type derived from C
@@ -208,7 +212,8 @@ var C = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -239,7 +244,8 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A2));
@@ -252,7 +258,8 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
index 323a5a2f2b6c3..a272ad42fa129 100644
--- a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
+++ b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
@@ -63,7 +63,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.staticMethod1 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
@@ -76,7 +77,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.staticMethod2 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
@@ -89,7 +91,8 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived3.staticMethod3 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
diff --git a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
index 1295dc7448e28..2add5e7e154d7 100644
--- a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
+++ b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
@@ -38,7 +38,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.staticMethod1 = function () {
         this.x; // OK, accessed within a class derived from their declaring class
@@ -49,7 +50,8 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived2.staticMethod3 = function () {
         this.x; // OK, accessed within a class derived from their declaring class
diff --git a/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js b/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
index f396c2483e80e..225acf74bbe69 100644
--- a/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
+++ b/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
@@ -19,7 +19,8 @@ var Alpha;
 var Beta = (function (_super) {
     __extends(Beta, _super);
     function Beta() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Beta;
 }(Alpha.x));
diff --git a/tests/baselines/reference/readonlyConstructorAssignment.js b/tests/baselines/reference/readonlyConstructorAssignment.js
index 40c292e4ce884..1c1e2a94ff171 100644
--- a/tests/baselines/reference/readonlyConstructorAssignment.js
+++ b/tests/baselines/reference/readonlyConstructorAssignment.js
@@ -56,7 +56,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         // Fails, x is readonly
         this.x = 1;
     }
@@ -67,7 +68,8 @@ var C = (function (_super) {
     // This is the usual behavior of readonly properties:
     // if one is redeclared in a base class, then it can be assigned to.
     function C(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.x = x;
         this.x = 1;
     }
@@ -84,7 +86,8 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E(x) {
-        _super.call(this, x);
+        var _this;
+        _this = _super.call(this, x) || this;
         this.x = x;
         this.x = 1;
     }
diff --git a/tests/baselines/reference/recursiveBaseCheck3.js b/tests/baselines/reference/recursiveBaseCheck3.js
index b032ce6774db3..5b3e829d2e6e5 100644
--- a/tests/baselines/reference/recursiveBaseCheck3.js
+++ b/tests/baselines/reference/recursiveBaseCheck3.js
@@ -13,14 +13,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return A;
 }(C));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/recursiveBaseCheck4.js b/tests/baselines/reference/recursiveBaseCheck4.js
index 07ba40c68b133..b515c7ab318ef 100644
--- a/tests/baselines/reference/recursiveBaseCheck4.js
+++ b/tests/baselines/reference/recursiveBaseCheck4.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var M = (function (_super) {
     __extends(M, _super);
     function M() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return M;
 }(M));
diff --git a/tests/baselines/reference/recursiveBaseCheck6.js b/tests/baselines/reference/recursiveBaseCheck6.js
index 5b880c294b736..1871eff20d4bb 100644
--- a/tests/baselines/reference/recursiveBaseCheck6.js
+++ b/tests/baselines/reference/recursiveBaseCheck6.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var S18 = (function (_super) {
     __extends(S18, _super);
     function S18() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return S18;
 }(S18));
diff --git a/tests/baselines/reference/recursiveBaseConstructorCreation1.js b/tests/baselines/reference/recursiveBaseConstructorCreation1.js
index dd79ba068bba2..c2f884aa8e4bb 100644
--- a/tests/baselines/reference/recursiveBaseConstructorCreation1.js
+++ b/tests/baselines/reference/recursiveBaseConstructorCreation1.js
@@ -21,7 +21,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js b/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
index 62e5958715e98..f84c7ad3daef0 100644
--- a/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
+++ b/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
@@ -28,7 +28,8 @@ var TypeScript2;
     var MemberNameArray = (function (_super) {
         __extends(MemberNameArray, _super);
         function MemberNameArray() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return MemberNameArray;
     }(MemberName));
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.js b/tests/baselines/reference/recursiveClassReferenceTest.js
index 3aa066d158d6b..2baa854e4625c 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.js
+++ b/tests/baselines/reference/recursiveClassReferenceTest.js
@@ -190,7 +190,8 @@ var Sample;
                 var Mode = (function (_super) {
                     __extends(Mode, _super);
                     function Mode() {
-                        _super.apply(this, arguments);
+                        var _this = _super.apply(this, arguments) || this;
+                        return _this;
                     }
                     // scenario 2
                     Mode.prototype.getInitialState = function () {
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.js.map b/tests/baselines/reference/recursiveClassReferenceTest.js.map
index 7e0b27b82b45c..56c0fc4e6eb16 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.js.map
+++ b/tests/baselines/reference/recursiveClassReferenceTest.js.map
@@ -1,2 +1,2 @@
 //// [recursiveClassReferenceTest.js.map]
-{"version":3,"file":"recursiveClassReferenceTest.js","sourceRoot":"","sources":["recursiveClassReferenceTest.ts"],"names":[],"mappings":"AAAA,iEAAiE;AACjE,0EAA0E;;;;;;AA8B1E,IAAO,MAAM,CAUZ;AAVD,WAAO,MAAM;IAAC,IAAA,OAAO,CAUpB;IAVa,WAAA,OAAO;QAAC,IAAA,KAAK,CAU1B;QAVqB,WAAA,OAAK;YAAC,IAAA,IAAI,CAU/B;YAV2B,WAAA,IAAI;gBAC/B;oBAAA;oBAQA,CAAC;oBANO,+BAAK,GAAZ,cAAiB,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBAExB,6BAAG,GAAV,UAAW,KAA6B;wBAEvC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBACF,sBAAC;gBAAD,CAAC,AARD,IAQC;gBARY,oBAAe,kBAQ3B,CAAA;YACF,CAAC,EAV2B,IAAI,GAAJ,YAAI,KAAJ,YAAI,QAU/B;QAAD,CAAC,EAVqB,KAAK,GAAL,aAAK,KAAL,aAAK,QAU1B;IAAD,CAAC,EAVa,OAAO,GAAP,cAAO,KAAP,cAAO,QAUpB;AAAD,CAAC,EAVM,MAAM,KAAN,MAAM,QAUZ;AAED,IAAO,MAAM,CAoBZ;AApBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAoBlB;IApBa,WAAA,KAAK;QAAC,IAAA,OAAO,CAoB1B;QApBmB,WAAA,OAAO;YAC1B;gBAKC,oBAAoB,SAAkC;oBAAlC,cAAS,GAAT,SAAS,CAAyB;oBAD9C,YAAO,GAAO,IAAI,CAAC;oBAEvB,aAAa;oBACb,SAAS,CAAC,SAAS,CAAC,WAAW,EAAE,IAAI,CAAC,CAAC;gBAC3C,CAAC;gBANM,wBAAG,GAAV,UAAW,MAAyC,IAAI,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;oBAAA,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;gBAAA,CAAC,CAAA,CAAC;gBAQlF,+BAAU,GAAjB;oBACC,MAAM,CAAC,OAAO,CAAC;gBAChB,CAAC;gBAEM,4BAAO,GAAd;gBAEA,CAAC;gBAEF,iBAAC;YAAD,CAAC,AAlBD,IAkBC;YAlBY,kBAAU,aAkBtB,CAAA;QACF,CAAC,EApBmB,OAAO,GAAP,aAAO,KAAP,aAAO,QAoB1B;IAAD,CAAC,EApBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAoBlB;AAAD,CAAC,EApBM,MAAM,KAAN,MAAM,QAoBZ;AAGD;IAAA;IAAuF,CAAC;IAA3C,sCAAe,GAAtB,cAAmC,MAAM,CAAC,IAAI,CAAC,CAAA,CAAC;IAAC,mBAAC;AAAD,CAAC,AAAxF,IAAwF;AASxF,IAAO,MAAM,CAwBZ;AAxBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAwBlB;IAxBa,WAAA,KAAK;QAAC,IAAA,SAAS,CAwB5B;QAxBmB,WAAA,SAAS;YAAC,IAAA,SAAS,CAwBtC;YAxB6B,WAAA,SAAS;gBAEtC;oBACO,eAAoB,IAAW;wBAAX,SAAI,GAAJ,IAAI,CAAO;oBAAI,CAAC;oBACnC,qBAAK,GAAZ;wBACC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBAEM,sBAAM,GAAb,UAAc,KAAY;wBACzB,MAAM,CAAC,IAAI,KAAK,KAAK,CAAC;oBACvB,CAAC;oBAEM,uBAAO,GAAd,cAA0B,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBACzC,YAAC;gBAAD,CAAC,AAXD,IAWC;gBAXY,eAAK,QAWjB,CAAA;gBAED;oBAA0B,wBAAY;oBAAtC;wBAA0B,8BAAY;oBAQtC,CAAC;oBANA,aAAa;oBACN,8BAAe,GAAtB;wBACC,MAAM,CAAC,IAAI,KAAK,CAAC,IAAI,CAAC,CAAC;oBACxB,CAAC;oBAGF,WAAC;gBAAD,CAAC,AARD,CAA0B,YAAY,GAQrC;gBARY,cAAI,OAQhB,CAAA;YACF,CAAC,EAxB6B,SAAS,GAAT,mBAAS,KAAT,mBAAS,QAwBtC;QAAD,CAAC,EAxBmB,SAAS,GAAT,eAAS,KAAT,eAAS,QAwB5B;IAAD,CAAC,EAxBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAwBlB;AAAD,CAAC,EAxBM,MAAM,KAAN,MAAM,QAwBZ"}
\ No newline at end of file
+{"version":3,"file":"recursiveClassReferenceTest.js","sourceRoot":"","sources":["recursiveClassReferenceTest.ts"],"names":[],"mappings":"AAAA,iEAAiE;AACjE,0EAA0E;;;;;;AA8B1E,IAAO,MAAM,CAUZ;AAVD,WAAO,MAAM;IAAC,IAAA,OAAO,CAUpB;IAVa,WAAA,OAAO;QAAC,IAAA,KAAK,CAU1B;QAVqB,WAAA,OAAK;YAAC,IAAA,IAAI,CAU/B;YAV2B,WAAA,IAAI;gBAC/B;oBAAA;oBAQA,CAAC;oBANO,+BAAK,GAAZ,cAAiB,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBAExB,6BAAG,GAAV,UAAW,KAA6B;wBAEvC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBACF,sBAAC;gBAAD,CAAC,AARD,IAQC;gBARY,oBAAe,kBAQ3B,CAAA;YACF,CAAC,EAV2B,IAAI,GAAJ,YAAI,KAAJ,YAAI,QAU/B;QAAD,CAAC,EAVqB,KAAK,GAAL,aAAK,KAAL,aAAK,QAU1B;IAAD,CAAC,EAVa,OAAO,GAAP,cAAO,KAAP,cAAO,QAUpB;AAAD,CAAC,EAVM,MAAM,KAAN,MAAM,QAUZ;AAED,IAAO,MAAM,CAoBZ;AApBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAoBlB;IApBa,WAAA,KAAK;QAAC,IAAA,OAAO,CAoB1B;QApBmB,WAAA,OAAO;YAC1B;gBAKC,oBAAoB,SAAkC;oBAAlC,cAAS,GAAT,SAAS,CAAyB;oBAD9C,YAAO,GAAO,IAAI,CAAC;oBAEvB,aAAa;oBACb,SAAS,CAAC,SAAS,CAAC,WAAW,EAAE,IAAI,CAAC,CAAC;gBAC3C,CAAC;gBANM,wBAAG,GAAV,UAAW,MAAyC,IAAI,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;oBAAA,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;gBAAA,CAAC,CAAA,CAAC;gBAQlF,+BAAU,GAAjB;oBACC,MAAM,CAAC,OAAO,CAAC;gBAChB,CAAC;gBAEM,4BAAO,GAAd;gBAEA,CAAC;gBAEF,iBAAC;YAAD,CAAC,AAlBD,IAkBC;YAlBY,kBAAU,aAkBtB,CAAA;QACF,CAAC,EApBmB,OAAO,GAAP,aAAO,KAAP,aAAO,QAoB1B;IAAD,CAAC,EApBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAoBlB;AAAD,CAAC,EApBM,MAAM,KAAN,MAAM,QAoBZ;AAGD;IAAA;IAAuF,CAAC;IAA3C,sCAAe,GAAtB,cAAmC,MAAM,CAAC,IAAI,CAAC,CAAA,CAAC;IAAC,mBAAC;AAAD,CAAC,AAAxF,IAAwF;AASxF,IAAO,MAAM,CAwBZ;AAxBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAwBlB;IAxBa,WAAA,KAAK;QAAC,IAAA,SAAS,CAwB5B;QAxBmB,WAAA,SAAS;YAAC,IAAA,SAAS,CAwBtC;YAxB6B,WAAA,SAAS;gBAEtC;oBACO,eAAoB,IAAW;wBAAX,SAAI,GAAJ,IAAI,CAAO;oBAAI,CAAC;oBACnC,qBAAK,GAAZ;wBACC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBAEM,sBAAM,GAAb,UAAc,KAAY;wBACzB,MAAM,CAAC,IAAI,KAAK,KAAK,CAAC;oBACvB,CAAC;oBAEM,uBAAO,GAAd,cAA0B,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBACzC,YAAC;gBAAD,CAAC,AAXD,IAWC;gBAXY,eAAK,QAWjB,CAAA;gBAED;oBAA0B,wBAAY;oBAAtC;wBAA0B,kDAAY;;oBAQtC,CAAC;oBANA,aAAa;oBACN,8BAAe,GAAtB;wBACC,MAAM,CAAC,IAAI,KAAK,CAAC,IAAI,CAAC,CAAC;oBACxB,CAAC;oBAGF,WAAC;gBAAD,CAAC,AARD,CAA0B,YAAY,GAQrC;gBARY,cAAI,OAQhB,CAAA;YACF,CAAC,EAxB6B,SAAS,GAAT,mBAAS,KAAT,mBAAS,QAwBtC;QAAD,CAAC,EAxBmB,SAAS,GAAT,eAAS,KAAT,eAAS,QAwB5B;IAAD,CAAC,EAxBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAwBlB;AAAD,CAAC,EAxBM,MAAM,KAAN,MAAM,QAwBZ"}
\ No newline at end of file
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt b/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
index 7e9da7dddf3cb..9656c07834342 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
+++ b/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
@@ -1692,18 +1692,19 @@ sourceFile:recursiveClassReferenceTest.ts
 ---
 >>>                    function Mode() {
 1 >^^^^^^^^^^^^^^^^^^^^
-2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(87, 21) Source(91, 2) + SourceIndex(0)
 ---
->>>                        _super.apply(this, arguments);
+>>>                        var _this = _super.apply(this, arguments) || this;
 1->^^^^^^^^^^^^^^^^^^^^^^^^
-2 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+2 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 1->export class Mode extends 
 2 >                        AbstractMode
 1->Emitted(88, 25) Source(91, 28) + SourceIndex(0)
-2 >Emitted(88, 55) Source(91, 40) + SourceIndex(0)
+2 >Emitted(88, 75) Source(91, 40) + SourceIndex(0)
 ---
+>>>                        return _this;
 >>>                    }
 1 >^^^^^^^^^^^^^^^^^^^^
 2 >                    ^
@@ -1718,8 +1719,8 @@ sourceFile:recursiveClassReferenceTest.ts
   >
   >	
 2 >                    }
-1 >Emitted(89, 21) Source(99, 2) + SourceIndex(0)
-2 >Emitted(89, 22) Source(99, 3) + SourceIndex(0)
+1 >Emitted(90, 21) Source(99, 2) + SourceIndex(0)
+2 >Emitted(90, 22) Source(99, 3) + SourceIndex(0)
 ---
 >>>                    // scenario 2
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1727,8 +1728,8 @@ sourceFile:recursiveClassReferenceTest.ts
 3 >                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1->
 2 >                    // scenario 2
-1->Emitted(90, 21) Source(93, 3) + SourceIndex(0)
-2 >Emitted(90, 34) Source(93, 16) + SourceIndex(0)
+1->Emitted(91, 21) Source(93, 3) + SourceIndex(0)
+2 >Emitted(91, 34) Source(93, 16) + SourceIndex(0)
 ---
 >>>                    Mode.prototype.getInitialState = function () {
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1738,9 +1739,9 @@ sourceFile:recursiveClassReferenceTest.ts
   >		public 
 2 >                    getInitialState
 3 >                                                  
-1->Emitted(91, 21) Source(94, 10) + SourceIndex(0)
-2 >Emitted(91, 51) Source(94, 25) + SourceIndex(0)
-3 >Emitted(91, 54) Source(94, 3) + SourceIndex(0)
+1->Emitted(92, 21) Source(94, 10) + SourceIndex(0)
+2 >Emitted(92, 51) Source(94, 25) + SourceIndex(0)
+3 >Emitted(92, 54) Source(94, 3) + SourceIndex(0)
 ---
 >>>                        return new State(self);
 1 >^^^^^^^^^^^^^^^^^^^^^^^^
@@ -1762,15 +1763,15 @@ sourceFile:recursiveClassReferenceTest.ts
 7 >                                         self
 8 >                                             )
 9 >                                              ;
-1 >Emitted(92, 25) Source(95, 4) + SourceIndex(0)
-2 >Emitted(92, 31) Source(95, 10) + SourceIndex(0)
-3 >Emitted(92, 32) Source(95, 11) + SourceIndex(0)
-4 >Emitted(92, 36) Source(95, 15) + SourceIndex(0)
-5 >Emitted(92, 41) Source(95, 20) + SourceIndex(0)
-6 >Emitted(92, 42) Source(95, 21) + SourceIndex(0)
-7 >Emitted(92, 46) Source(95, 25) + SourceIndex(0)
-8 >Emitted(92, 47) Source(95, 26) + SourceIndex(0)
-9 >Emitted(92, 48) Source(95, 27) + SourceIndex(0)
+1 >Emitted(93, 25) Source(95, 4) + SourceIndex(0)
+2 >Emitted(93, 31) Source(95, 10) + SourceIndex(0)
+3 >Emitted(93, 32) Source(95, 11) + SourceIndex(0)
+4 >Emitted(93, 36) Source(95, 15) + SourceIndex(0)
+5 >Emitted(93, 41) Source(95, 20) + SourceIndex(0)
+6 >Emitted(93, 42) Source(95, 21) + SourceIndex(0)
+7 >Emitted(93, 46) Source(95, 25) + SourceIndex(0)
+8 >Emitted(93, 47) Source(95, 26) + SourceIndex(0)
+9 >Emitted(93, 48) Source(95, 27) + SourceIndex(0)
 ---
 >>>                    };
 1 >^^^^^^^^^^^^^^^^^^^^
@@ -1779,8 +1780,8 @@ sourceFile:recursiveClassReferenceTest.ts
 1 >
   >		
 2 >                    }
-1 >Emitted(93, 21) Source(96, 3) + SourceIndex(0)
-2 >Emitted(93, 22) Source(96, 4) + SourceIndex(0)
+1 >Emitted(94, 21) Source(96, 3) + SourceIndex(0)
+2 >Emitted(94, 22) Source(96, 4) + SourceIndex(0)
 ---
 >>>                    return Mode;
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1791,8 +1792,8 @@ sourceFile:recursiveClassReferenceTest.ts
   >
   >	
 2 >                    }
-1->Emitted(94, 21) Source(99, 2) + SourceIndex(0)
-2 >Emitted(94, 32) Source(99, 3) + SourceIndex(0)
+1->Emitted(95, 21) Source(99, 2) + SourceIndex(0)
+2 >Emitted(95, 32) Source(99, 3) + SourceIndex(0)
 ---
 >>>                }(AbstractMode));
 1->^^^^^^^^^^^^^^^^
@@ -1816,12 +1817,12 @@ sourceFile:recursiveClassReferenceTest.ts
   >                              
   >                              
   >                              	}
-1->Emitted(95, 17) Source(99, 2) + SourceIndex(0)
-2 >Emitted(95, 18) Source(99, 3) + SourceIndex(0)
-3 >Emitted(95, 18) Source(91, 2) + SourceIndex(0)
-4 >Emitted(95, 19) Source(91, 28) + SourceIndex(0)
-5 >Emitted(95, 31) Source(91, 40) + SourceIndex(0)
-6 >Emitted(95, 34) Source(99, 3) + SourceIndex(0)
+1->Emitted(96, 17) Source(99, 2) + SourceIndex(0)
+2 >Emitted(96, 18) Source(99, 3) + SourceIndex(0)
+3 >Emitted(96, 18) Source(91, 2) + SourceIndex(0)
+4 >Emitted(96, 19) Source(91, 28) + SourceIndex(0)
+5 >Emitted(96, 31) Source(91, 40) + SourceIndex(0)
+6 >Emitted(96, 34) Source(99, 3) + SourceIndex(0)
 ---
 >>>                PlainText.Mode = Mode;
 1->^^^^^^^^^^^^^^^^
@@ -1841,10 +1842,10 @@ sourceFile:recursiveClassReferenceTest.ts
   >                              
   >                              	}
 4 >                                     
-1->Emitted(96, 17) Source(91, 15) + SourceIndex(0)
-2 >Emitted(96, 31) Source(91, 19) + SourceIndex(0)
-3 >Emitted(96, 38) Source(99, 3) + SourceIndex(0)
-4 >Emitted(96, 39) Source(99, 3) + SourceIndex(0)
+1->Emitted(97, 17) Source(91, 15) + SourceIndex(0)
+2 >Emitted(97, 31) Source(91, 19) + SourceIndex(0)
+3 >Emitted(97, 38) Source(99, 3) + SourceIndex(0)
+4 >Emitted(97, 39) Source(99, 3) + SourceIndex(0)
 ---
 >>>            })(PlainText = Languages.PlainText || (Languages.PlainText = {}));
 1->^^^^^^^^^^^^
@@ -1890,15 +1891,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                                                      
   >                                                                      	}
   >                                                                      }
-1->Emitted(97, 13) Source(100, 1) + SourceIndex(0)
-2 >Emitted(97, 14) Source(100, 2) + SourceIndex(0)
-3 >Emitted(97, 16) Source(76, 31) + SourceIndex(0)
-4 >Emitted(97, 25) Source(76, 40) + SourceIndex(0)
-5 >Emitted(97, 28) Source(76, 31) + SourceIndex(0)
-6 >Emitted(97, 47) Source(76, 40) + SourceIndex(0)
-7 >Emitted(97, 52) Source(76, 31) + SourceIndex(0)
-8 >Emitted(97, 71) Source(76, 40) + SourceIndex(0)
-9 >Emitted(97, 79) Source(100, 2) + SourceIndex(0)
+1->Emitted(98, 13) Source(100, 1) + SourceIndex(0)
+2 >Emitted(98, 14) Source(100, 2) + SourceIndex(0)
+3 >Emitted(98, 16) Source(76, 31) + SourceIndex(0)
+4 >Emitted(98, 25) Source(76, 40) + SourceIndex(0)
+5 >Emitted(98, 28) Source(76, 31) + SourceIndex(0)
+6 >Emitted(98, 47) Source(76, 40) + SourceIndex(0)
+7 >Emitted(98, 52) Source(76, 31) + SourceIndex(0)
+8 >Emitted(98, 71) Source(76, 40) + SourceIndex(0)
+9 >Emitted(98, 79) Source(100, 2) + SourceIndex(0)
 ---
 >>>        })(Languages = Thing.Languages || (Thing.Languages = {}));
 1 >^^^^^^^^
@@ -1943,15 +1944,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                                          
   >                                                          	}
   >                                                          }
-1 >Emitted(98, 9) Source(100, 1) + SourceIndex(0)
-2 >Emitted(98, 10) Source(100, 2) + SourceIndex(0)
-3 >Emitted(98, 12) Source(76, 21) + SourceIndex(0)
-4 >Emitted(98, 21) Source(76, 30) + SourceIndex(0)
-5 >Emitted(98, 24) Source(76, 21) + SourceIndex(0)
-6 >Emitted(98, 39) Source(76, 30) + SourceIndex(0)
-7 >Emitted(98, 44) Source(76, 21) + SourceIndex(0)
-8 >Emitted(98, 59) Source(76, 30) + SourceIndex(0)
-9 >Emitted(98, 67) Source(100, 2) + SourceIndex(0)
+1 >Emitted(99, 9) Source(100, 1) + SourceIndex(0)
+2 >Emitted(99, 10) Source(100, 2) + SourceIndex(0)
+3 >Emitted(99, 12) Source(76, 21) + SourceIndex(0)
+4 >Emitted(99, 21) Source(76, 30) + SourceIndex(0)
+5 >Emitted(99, 24) Source(76, 21) + SourceIndex(0)
+6 >Emitted(99, 39) Source(76, 30) + SourceIndex(0)
+7 >Emitted(99, 44) Source(76, 21) + SourceIndex(0)
+8 >Emitted(99, 59) Source(76, 30) + SourceIndex(0)
+9 >Emitted(99, 67) Source(100, 2) + SourceIndex(0)
 ---
 >>>    })(Thing = Sample.Thing || (Sample.Thing = {}));
 1 >^^^^
@@ -1996,15 +1997,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                            
   >                                            	}
   >                                            }
-1 >Emitted(99, 5) Source(100, 1) + SourceIndex(0)
-2 >Emitted(99, 6) Source(100, 2) + SourceIndex(0)
-3 >Emitted(99, 8) Source(76, 15) + SourceIndex(0)
-4 >Emitted(99, 13) Source(76, 20) + SourceIndex(0)
-5 >Emitted(99, 16) Source(76, 15) + SourceIndex(0)
-6 >Emitted(99, 28) Source(76, 20) + SourceIndex(0)
-7 >Emitted(99, 33) Source(76, 15) + SourceIndex(0)
-8 >Emitted(99, 45) Source(76, 20) + SourceIndex(0)
-9 >Emitted(99, 53) Source(100, 2) + SourceIndex(0)
+1 >Emitted(100, 5) Source(100, 1) + SourceIndex(0)
+2 >Emitted(100, 6) Source(100, 2) + SourceIndex(0)
+3 >Emitted(100, 8) Source(76, 15) + SourceIndex(0)
+4 >Emitted(100, 13) Source(76, 20) + SourceIndex(0)
+5 >Emitted(100, 16) Source(76, 15) + SourceIndex(0)
+6 >Emitted(100, 28) Source(76, 20) + SourceIndex(0)
+7 >Emitted(100, 33) Source(76, 15) + SourceIndex(0)
+8 >Emitted(100, 45) Source(76, 20) + SourceIndex(0)
+9 >Emitted(100, 53) Source(100, 2) + SourceIndex(0)
 ---
 >>>})(Sample || (Sample = {}));
 1 >
@@ -2046,12 +2047,12 @@ sourceFile:recursiveClassReferenceTest.ts
   >                    
   >                    	}
   >                    }
-1 >Emitted(100, 1) Source(100, 1) + SourceIndex(0)
-2 >Emitted(100, 2) Source(100, 2) + SourceIndex(0)
-3 >Emitted(100, 4) Source(76, 8) + SourceIndex(0)
-4 >Emitted(100, 10) Source(76, 14) + SourceIndex(0)
-5 >Emitted(100, 15) Source(76, 8) + SourceIndex(0)
-6 >Emitted(100, 21) Source(76, 14) + SourceIndex(0)
-7 >Emitted(100, 29) Source(100, 2) + SourceIndex(0)
+1 >Emitted(101, 1) Source(100, 1) + SourceIndex(0)
+2 >Emitted(101, 2) Source(100, 2) + SourceIndex(0)
+3 >Emitted(101, 4) Source(76, 8) + SourceIndex(0)
+4 >Emitted(101, 10) Source(76, 14) + SourceIndex(0)
+5 >Emitted(101, 15) Source(76, 8) + SourceIndex(0)
+6 >Emitted(101, 21) Source(76, 14) + SourceIndex(0)
+7 >Emitted(101, 29) Source(100, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=recursiveClassReferenceTest.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/recursiveComplicatedClasses.js b/tests/baselines/reference/recursiveComplicatedClasses.js
index a57560244582f..ea31184d8567a 100644
--- a/tests/baselines/reference/recursiveComplicatedClasses.js
+++ b/tests/baselines/reference/recursiveComplicatedClasses.js
@@ -51,21 +51,24 @@ var Symbol = (function () {
 var InferenceSymbol = (function (_super) {
     __extends(InferenceSymbol, _super);
     function InferenceSymbol() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return InferenceSymbol;
 }(Symbol));
 var ParameterSymbol = (function (_super) {
     __extends(ParameterSymbol, _super);
     function ParameterSymbol() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ParameterSymbol;
 }(InferenceSymbol));
 var TypeSymbol = (function (_super) {
     __extends(TypeSymbol, _super);
     function TypeSymbol() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return TypeSymbol;
 }(InferenceSymbol));
diff --git a/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js b/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
index 92cc2f72cac4f..72c97c309660a 100644
--- a/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
+++ b/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
@@ -52,7 +52,8 @@ var MsPortal;
                 var ViewModel = (function (_super) {
                     __extends(ViewModel, _super);
                     function ViewModel() {
-                        _super.apply(this, arguments);
+                        var _this = _super.apply(this, arguments) || this;
+                        return _this;
                     }
                     return ViewModel;
                 }(ItemValue));
diff --git a/tests/baselines/reference/reexportClassDefinition.js b/tests/baselines/reference/reexportClassDefinition.js
index a4b68115ac258..95ce777e446f3 100644
--- a/tests/baselines/reference/reexportClassDefinition.js
+++ b/tests/baselines/reference/reexportClassDefinition.js
@@ -42,7 +42,8 @@ var foo2 = require("./foo2");
 var x = (function (_super) {
     __extends(x, _super);
     function x() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return x;
 }(foo2.x));
diff --git a/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js b/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
index 6e621a1880595..d2ec8e168bfad 100644
--- a/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
+++ b/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
@@ -1030,7 +1030,8 @@ var rionegrensis;
     var caniventer = (function (_super) {
         __extends(caniventer, _super);
         function caniventer() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         caniventer.prototype.salomonseni = function () {
             var _this = this;
@@ -1068,7 +1069,8 @@ var rionegrensis;
     var veraecrucis = (function (_super) {
         __extends(veraecrucis, _super);
         function veraecrucis() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         veraecrucis.prototype.naso = function () {
             var _this = this;
@@ -1247,7 +1249,8 @@ var julianae;
     var oralis = (function (_super) {
         __extends(oralis, _super);
         function oralis() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         oralis.prototype.cepapi = function () {
             var _this = this;
@@ -1333,7 +1336,8 @@ var julianae;
     var sumatrana = (function (_super) {
         __extends(sumatrana, _super);
         function sumatrana() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         sumatrana.prototype.wolffsohni = function () {
             var _this = this;
@@ -1533,7 +1537,8 @@ var julianae;
     var durangae = (function (_super) {
         __extends(durangae, _super);
         function durangae() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         durangae.prototype.Californium = function () {
             var _this = this;
@@ -1607,7 +1612,8 @@ var Lanthanum;
     var nitidus = (function (_super) {
         __extends(nitidus, _super);
         function nitidus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         nitidus.prototype.granatensis = function () {
             var _this = this;
@@ -1675,7 +1681,8 @@ var Lanthanum;
     var megalonyx = (function (_super) {
         __extends(megalonyx, _super);
         function megalonyx() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         megalonyx.prototype.phillipsii = function () {
             var _this = this;
@@ -1824,7 +1831,8 @@ var rendalli;
     var zuluensis = (function (_super) {
         __extends(zuluensis, _super);
         function zuluensis() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         zuluensis.prototype.telfairi = function () {
             var _this = this;
@@ -1982,7 +1990,8 @@ var rendalli;
     var crenulata = (function (_super) {
         __extends(crenulata, _super);
         function crenulata() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         crenulata.prototype.salvanius = function () {
             var _this = this;
@@ -2065,7 +2074,8 @@ var trivirgatus;
     var mixtus = (function (_super) {
         __extends(mixtus, _super);
         function mixtus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         mixtus.prototype.ochrogaster = function () {
             var _this = this;
@@ -2307,7 +2317,8 @@ var ruatanica;
     var americanus = (function (_super) {
         __extends(americanus, _super);
         function americanus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         americanus.prototype.nasoloi = function () {
             var _this = this;
@@ -2342,7 +2353,8 @@ var lavali;
     var wilsoni = (function (_super) {
         __extends(wilsoni, _super);
         function wilsoni() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         wilsoni.prototype.setiger = function () {
             var _this = this;
@@ -2434,7 +2446,8 @@ var lavali;
     var otion = (function (_super) {
         __extends(otion, _super);
         function otion() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         otion.prototype.bonaerensis = function () {
             var _this = this;
@@ -2598,7 +2611,8 @@ var lavali;
     var thaeleri = (function (_super) {
         __extends(thaeleri, _super);
         function thaeleri() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         thaeleri.prototype.coromandra = function () {
             var _this = this;
@@ -2654,7 +2668,8 @@ var lavali;
     var lepturus = (function (_super) {
         __extends(lepturus, _super);
         function lepturus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         lepturus.prototype.ferrumequinum = function () {
             var _this = this;
@@ -2677,7 +2692,8 @@ var dogramacii;
     var robustulus = (function (_super) {
         __extends(robustulus, _super);
         function robustulus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         robustulus.prototype.fossor = function () {
             var _this = this;
@@ -2892,7 +2908,8 @@ var lutreolus;
     var schlegeli = (function (_super) {
         __extends(schlegeli, _super);
         function schlegeli() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         schlegeli.prototype.mittendorfi = function () {
             var _this = this;
@@ -3119,7 +3136,8 @@ var panglima;
     var amphibius = (function (_super) {
         __extends(amphibius, _super);
         function amphibius() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         amphibius.prototype.bottegi = function () {
             var _this = this;
@@ -3163,7 +3181,8 @@ var panglima;
     var fundatus = (function (_super) {
         __extends(fundatus, _super);
         function fundatus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         fundatus.prototype.crassulus = function () {
             var _this = this;
@@ -3189,7 +3208,8 @@ var panglima;
     var abidi = (function (_super) {
         __extends(abidi, _super);
         function abidi() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         abidi.prototype.greyii = function () {
             var _this = this;
@@ -3281,7 +3301,8 @@ var minutus;
     var himalayana = (function (_super) {
         __extends(himalayana, _super);
         function himalayana() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         himalayana.prototype.simoni = function () {
             var _this = this;
@@ -3364,7 +3385,8 @@ var caurinus;
     var mahaganus = (function (_super) {
         __extends(mahaganus, _super);
         function mahaganus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         mahaganus.prototype.martiniquensis = function () {
             var _this = this;
@@ -3438,7 +3460,8 @@ var howi;
     var angulatus = (function (_super) {
         __extends(angulatus, _super);
         function angulatus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         angulatus.prototype.pennatus = function () {
             var _this = this;
@@ -3521,7 +3544,8 @@ var sagitta;
     var walkeri = (function (_super) {
         __extends(walkeri, _super);
         function walkeri() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         walkeri.prototype.maracajuensis = function () {
             var _this = this;
@@ -3538,7 +3562,8 @@ var minutus;
     var inez = (function (_super) {
         __extends(inez, _super);
         function inez() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         inez.prototype.vexillaris = function () {
             var _this = this;
@@ -3555,7 +3580,8 @@ var macrorhinos;
     var konganensis = (function (_super) {
         __extends(konganensis, _super);
         function konganensis() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return konganensis;
     }(imperfecta.lasiurus));
@@ -3566,7 +3592,8 @@ var panamensis;
     var linulus = (function (_super) {
         __extends(linulus, _super);
         function linulus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         linulus.prototype.goslingi = function () {
             var _this = this;
@@ -3718,7 +3745,8 @@ var samarensis;
     var pelurus = (function (_super) {
         __extends(pelurus, _super);
         function pelurus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         pelurus.prototype.Palladium = function () {
             var _this = this;
@@ -3804,7 +3832,8 @@ var samarensis;
     var fuscus = (function (_super) {
         __extends(fuscus, _super);
         function fuscus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         fuscus.prototype.planifrons = function () {
             var _this = this;
@@ -3965,7 +3994,8 @@ var sagitta;
     var leptoceros = (function (_super) {
         __extends(leptoceros, _super);
         function leptoceros() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         leptoceros.prototype.victus = function () {
             var _this = this;
@@ -4006,7 +4036,8 @@ var daubentonii;
     var nigricans = (function (_super) {
         __extends(nigricans, _super);
         function nigricans() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         nigricans.prototype.woosnami = function () {
             var _this = this;
@@ -4032,7 +4063,8 @@ var argurus;
     var pygmaea = (function (_super) {
         __extends(pygmaea, _super);
         function pygmaea() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         pygmaea.prototype.pajeros = function () {
             var _this = this;
@@ -4061,7 +4093,8 @@ var chrysaeolus;
     var sarasinorum = (function (_super) {
         __extends(sarasinorum, _super);
         function sarasinorum() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         sarasinorum.prototype.belzebul = function () {
             var _this = this;
@@ -4165,7 +4198,8 @@ var argurus;
     var oreas = (function (_super) {
         __extends(oreas, _super);
         function oreas() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         oreas.prototype.salamonis = function () {
             var _this = this;
@@ -4392,7 +4426,8 @@ var provocax;
     var melanoleuca = (function (_super) {
         __extends(melanoleuca, _super);
         function melanoleuca() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         melanoleuca.prototype.Neodymium = function () {
             var _this = this;
@@ -4436,7 +4471,8 @@ var howi;
     var marcanoi = (function (_super) {
         __extends(marcanoi, _super);
         function marcanoi() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         marcanoi.prototype.formosae = function () {
             var _this = this;
@@ -4843,7 +4879,8 @@ var gabriellae;
     var klossii = (function (_super) {
         __extends(klossii, _super);
         function klossii() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return klossii;
     }(imperfecta.lasiurus));
@@ -5046,7 +5083,8 @@ var imperfecta;
     var ciliolabrum = (function (_super) {
         __extends(ciliolabrum, _super);
         function ciliolabrum() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         ciliolabrum.prototype.leschenaultii = function () {
             var _this = this;
@@ -5108,7 +5146,8 @@ var petrophilus;
     var sodyi = (function (_super) {
         __extends(sodyi, _super);
         function sodyi() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         sodyi.prototype.saundersiae = function () {
             var _this = this;
@@ -5173,7 +5212,8 @@ var caurinus;
     var megaphyllus = (function (_super) {
         __extends(megaphyllus, _super);
         function megaphyllus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         megaphyllus.prototype.montana = function () {
             var _this = this;
@@ -5346,7 +5386,8 @@ var lutreolus;
     var cor = (function (_super) {
         __extends(cor, _super);
         function cor() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         cor.prototype.antinorii = function () {
             var _this = this;
@@ -5438,7 +5479,8 @@ var argurus;
     var germaini = (function (_super) {
         __extends(germaini, _super);
         function germaini() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         germaini.prototype.sharpei = function () {
             var _this = this;
@@ -5536,7 +5578,8 @@ var dammermani;
     var melanops = (function (_super) {
         __extends(melanops, _super);
         function melanops() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         melanops.prototype.blarina = function () {
             var _this = this;
@@ -5625,7 +5668,8 @@ var argurus;
     var peninsulae = (function (_super) {
         __extends(peninsulae, _super);
         function peninsulae() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         peninsulae.prototype.aitkeni = function () {
             var _this = this;
@@ -5771,7 +5815,8 @@ var ruatanica;
     var Praseodymium = (function (_super) {
         __extends(Praseodymium, _super);
         function Praseodymium() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         Praseodymium.prototype.clara = function () {
             var _this = this;
@@ -5860,7 +5905,8 @@ var caurinus;
     var johorensis = (function (_super) {
         __extends(johorensis, _super);
         function johorensis() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         johorensis.prototype.maini = function () {
             var _this = this;
@@ -5988,7 +6034,8 @@ var caurinus;
     var psilurus = (function (_super) {
         __extends(psilurus, _super);
         function psilurus() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         psilurus.prototype.socialis = function () {
             var _this = this;
diff --git a/tests/baselines/reference/returnInConstructor1.js b/tests/baselines/reference/returnInConstructor1.js
index fab0fe8fe0916..cd3a9f4c34682 100644
--- a/tests/baselines/reference/returnInConstructor1.js
+++ b/tests/baselines/reference/returnInConstructor1.js
@@ -123,7 +123,8 @@ var G = (function () {
 var H = (function (_super) {
     __extends(H, _super);
     function H() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         return new G(); //error
     }
     return H;
@@ -131,7 +132,8 @@ var H = (function (_super) {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         return new G();
     }
     return I;
diff --git a/tests/baselines/reference/returnStatements.js b/tests/baselines/reference/returnStatements.js
index a543ad3bddae7..659eea55689ba 100644
--- a/tests/baselines/reference/returnStatements.js
+++ b/tests/baselines/reference/returnStatements.js
@@ -48,7 +48,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js b/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
index 3833a5caf7a82..02c812454459b 100644
--- a/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
+++ b/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
@@ -22,7 +22,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.c = function () {
         v = 1;
diff --git a/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js b/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
index d5de584e77958..781fd5ac6eef1 100644
--- a/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
+++ b/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
@@ -22,7 +22,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.c = function () {
         v = 1;
diff --git a/tests/baselines/reference/scopeTests.js b/tests/baselines/reference/scopeTests.js
index 833e84ee5f3ae..e9394a64c9b83 100644
--- a/tests/baselines/reference/scopeTests.js
+++ b/tests/baselines/reference/scopeTests.js
@@ -25,7 +25,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.v = 1;
         this.p = 1;
         C.s = 1;
diff --git a/tests/baselines/reference/shadowPrivateMembers.js b/tests/baselines/reference/shadowPrivateMembers.js
index a1474a24777c1..d7e1b69e27451 100644
--- a/tests/baselines/reference/shadowPrivateMembers.js
+++ b/tests/baselines/reference/shadowPrivateMembers.js
@@ -18,7 +18,8 @@ var base = (function () {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     derived.prototype.n = function () { };
     return derived;
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
index 1d852127963ae..ea71fbc20c0d6 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
@@ -21,7 +21,8 @@ var AbstractGreeter = (function () {
 var Greeter = (function (_super) {
     __extends(Greeter, _super);
     function Greeter() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.a = 10;
         this.nameA = "Ten";
     }
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
index 9c350133f2bf9..e36f2eaaf8ece 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
@@ -1,2 +1,2 @@
 //// [sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map]
-{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;;QACW,MAAC,GAAG,EAAE,CAAC;QACP,UAAK,GAAG,KAAK,CAAC;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
+{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,MAAC,GAAG,EAAE,CAAC;QACP,UAAK,GAAG,KAAK,CAAC;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
index f305238465126..3da1d42edcde7 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
@@ -77,11 +77,23 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 ---
 >>>    function Greeter() {
 1 >^^^^
-2 >    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >    ^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(13, 5) Source(4, 1) + SourceIndex(0)
 ---
->>>        _super.apply(this, arguments);
+>>>        var _this;
+1->^^^^^^^^
+2 >        ^^^^^^^^^^
+3 >                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->
+2 >        class Greeter extends AbstractGreeter {
+  >            public a = 10;
+  >            public nameA = "Ten";
+  >        }
+1->Emitted(14, 9) Source(4, 1) + SourceIndex(0)
+2 >Emitted(14, 19) Source(7, 2) + SourceIndex(0)
+---
+>>>        _this = _super.apply(this, arguments) || this;
 >>>        this.a = 10;
 1->^^^^^^^^
 2 >        ^^^^^^
@@ -89,17 +101,16 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 4 >                 ^^
 5 >                   ^
 6 >                    ^^^^^^^^->
-1->class Greeter extends AbstractGreeter {
-  >    public 
+1->
 2 >        a
 3 >               = 
 4 >                 10
 5 >                   ;
-1->Emitted(15, 9) Source(5, 12) + SourceIndex(0)
-2 >Emitted(15, 15) Source(5, 13) + SourceIndex(0)
-3 >Emitted(15, 18) Source(5, 16) + SourceIndex(0)
-4 >Emitted(15, 20) Source(5, 18) + SourceIndex(0)
-5 >Emitted(15, 21) Source(5, 19) + SourceIndex(0)
+1->Emitted(16, 9) Source(5, 12) + SourceIndex(0)
+2 >Emitted(16, 15) Source(5, 13) + SourceIndex(0)
+3 >Emitted(16, 18) Source(5, 16) + SourceIndex(0)
+4 >Emitted(16, 20) Source(5, 18) + SourceIndex(0)
+5 >Emitted(16, 21) Source(5, 19) + SourceIndex(0)
 ---
 >>>        this.nameA = "Ten";
 1->^^^^^^^^
@@ -113,11 +124,11 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 3 >                   = 
 4 >                     "Ten"
 5 >                          ;
-1->Emitted(16, 9) Source(6, 12) + SourceIndex(0)
-2 >Emitted(16, 19) Source(6, 17) + SourceIndex(0)
-3 >Emitted(16, 22) Source(6, 20) + SourceIndex(0)
-4 >Emitted(16, 27) Source(6, 25) + SourceIndex(0)
-5 >Emitted(16, 28) Source(6, 26) + SourceIndex(0)
+1->Emitted(17, 9) Source(6, 12) + SourceIndex(0)
+2 >Emitted(17, 19) Source(6, 17) + SourceIndex(0)
+3 >Emitted(17, 22) Source(6, 20) + SourceIndex(0)
+4 >Emitted(17, 27) Source(6, 25) + SourceIndex(0)
+5 >Emitted(17, 28) Source(6, 26) + SourceIndex(0)
 ---
 >>>    }
 1 >^^^^
@@ -126,8 +137,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 1 >
   >
 2 >    }
-1 >Emitted(17, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(17, 6) Source(7, 2) + SourceIndex(0)
+1 >Emitted(18, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(18, 6) Source(7, 2) + SourceIndex(0)
 ---
 >>>    return Greeter;
 1->^^^^
@@ -135,8 +146,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 3 >                  ^^^->
 1->
 2 >    }
-1->Emitted(18, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(18, 19) Source(7, 2) + SourceIndex(0)
+1->Emitted(19, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(19, 19) Source(7, 2) + SourceIndex(0)
 ---
 >>>}(AbstractGreeter));
 1->
@@ -155,11 +166,11 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
   >                     public a = 10;
   >                     public nameA = "Ten";
   >                 }
-1->Emitted(19, 1) Source(7, 1) + SourceIndex(0)
-2 >Emitted(19, 2) Source(7, 2) + SourceIndex(0)
-3 >Emitted(19, 2) Source(4, 1) + SourceIndex(0)
-4 >Emitted(19, 3) Source(4, 23) + SourceIndex(0)
-5 >Emitted(19, 18) Source(4, 38) + SourceIndex(0)
-6 >Emitted(19, 21) Source(7, 2) + SourceIndex(0)
+1->Emitted(20, 1) Source(7, 1) + SourceIndex(0)
+2 >Emitted(20, 2) Source(7, 2) + SourceIndex(0)
+3 >Emitted(20, 2) Source(4, 1) + SourceIndex(0)
+4 >Emitted(20, 3) Source(4, 23) + SourceIndex(0)
+5 >Emitted(20, 18) Source(4, 38) + SourceIndex(0)
+6 >Emitted(20, 21) Source(7, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/specializedInheritedConstructors1.js b/tests/baselines/reference/specializedInheritedConstructors1.js
index f521ba14838b6..4f14cb6db97d5 100644
--- a/tests/baselines/reference/specializedInheritedConstructors1.js
+++ b/tests/baselines/reference/specializedInheritedConstructors1.js
@@ -36,7 +36,8 @@ var Model = (function () {
 var MyView = (function (_super) {
     __extends(MyView, _super);
     function MyView() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyView;
 }(View));
diff --git a/tests/baselines/reference/specializedOverloadWithRestParameters.js b/tests/baselines/reference/specializedOverloadWithRestParameters.js
index 62688f7cb7ef3..3b909a8083646 100644
--- a/tests/baselines/reference/specializedOverloadWithRestParameters.js
+++ b/tests/baselines/reference/specializedOverloadWithRestParameters.js
@@ -27,7 +27,8 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
diff --git a/tests/baselines/reference/staticFactory1.js b/tests/baselines/reference/staticFactory1.js
index 6ccd30e37d15a..d229c5330ba5a 100644
--- a/tests/baselines/reference/staticFactory1.js
+++ b/tests/baselines/reference/staticFactory1.js
@@ -31,7 +31,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Derived.prototype.foo = function () { return 2; };
     return Derived;
diff --git a/tests/baselines/reference/staticInheritance.js b/tests/baselines/reference/staticInheritance.js
index 52868930792a8..8b4b8326cab07 100644
--- a/tests/baselines/reference/staticInheritance.js
+++ b/tests/baselines/reference/staticInheritance.js
@@ -27,7 +27,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.p1 = doThing(A); // OK
         this.p2 = doThing(B); // OK
     }
diff --git a/tests/baselines/reference/staticMemberAccessOffDerivedType1.js b/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
index 1c76a2512208f..a07bea081a9fa 100644
--- a/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
+++ b/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
@@ -26,7 +26,8 @@ var SomeBase = (function () {
 var P = (function (_super) {
     __extends(P, _super);
     function P() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return P;
 }(SomeBase));
diff --git a/tests/baselines/reference/staticPropSuper.js b/tests/baselines/reference/staticPropSuper.js
index c25c406746dfb..b2eea36eece14 100644
--- a/tests/baselines/reference/staticPropSuper.js
+++ b/tests/baselines/reference/staticPropSuper.js
@@ -49,8 +49,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         var x = 1; // should not error
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return B;
 }(A));
@@ -58,6 +59,7 @@ B.s = 9;
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
+        var _this;
         this.p = 10;
         var x = 1; // should error
     }
@@ -66,6 +68,7 @@ var C = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         this.p = 11;
         var x = 1; // should error
     }
@@ -74,6 +77,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
+        var _this;
         this.p = 12;
         var x = 1; // should error
     }
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index 446fed5b76a2f..e40e0c45a59a1 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -74,8 +74,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         "use strict"; // No error
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.s = 9;
     }
     return B;
@@ -83,7 +84,8 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.call(this); // No error
+        var _this;
+        _this = _super.call(this) || this; // No error
         this.s = 9;
         "use strict";
     }
@@ -92,9 +94,10 @@ var C = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         this.s = 9;
         var x = 1; // Error
-        _super.call(this);
+        _this = _super.call(this) || this;
         "use strict";
     }
     return D;
@@ -102,8 +105,9 @@ var D = (function (_super) {
 var Bs = (function (_super) {
     __extends(Bs, _super);
     function Bs() {
+        var _this;
         "use strict"; // No error
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return Bs;
 }(A));
@@ -111,7 +115,8 @@ Bs.s = 9;
 var Cs = (function (_super) {
     __extends(Cs, _super);
     function Cs() {
-        _super.call(this); // No error
+        var _this;
+        _this = _super.call(this) || this; // No error
         "use strict";
     }
     return Cs;
@@ -120,8 +125,9 @@ Cs.s = 9;
 var Ds = (function (_super) {
     __extends(Ds, _super);
     function Ds() {
+        var _this;
         var x = 1; // no Error
-        _super.call(this);
+        _this = _super.call(this) || this;
         "use strict";
     }
     return Ds;
diff --git a/tests/baselines/reference/strictModeReservedWord.js b/tests/baselines/reference/strictModeReservedWord.js
index 210d9ec75be64..af01ca1716f9d 100644
--- a/tests/baselines/reference/strictModeReservedWord.js
+++ b/tests/baselines/reference/strictModeReservedWord.js
@@ -48,7 +48,8 @@ function foo() {
     var myClass = (function (_super) {
         __extends(package, _super);
         function package() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return package;
     }(public));
diff --git a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
index 281b4ade5d6b7..300d83b9bbceb 100644
--- a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
+++ b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
@@ -75,14 +75,16 @@ var F1 = (function () {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return G;
 }(package));
 var H = (function (_super) {
     __extends(H, _super);
     function H() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return H;
 }(package.A));
diff --git a/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js b/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
index 08a26230f3742..eb5052f51d7db 100644
--- a/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
+++ b/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
@@ -55,7 +55,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.bar = function () { return ''; };
     return B;
diff --git a/tests/baselines/reference/subtypesOfTypeParameter.js b/tests/baselines/reference/subtypesOfTypeParameter.js
index 10d9e3e42eca4..cbe42a510b34d 100644
--- a/tests/baselines/reference/subtypesOfTypeParameter.js
+++ b/tests/baselines/reference/subtypesOfTypeParameter.js
@@ -120,7 +120,8 @@ var C3 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(C3));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
index 0753c52dc9eb7..568002483939a 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
@@ -182,28 +182,32 @@ var C3 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(C3));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(C3));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D3;
 }(C3));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D4;
 }(C3));
@@ -213,21 +217,24 @@ var D4 = (function (_super) {
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D5;
 }(C3));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D6;
 }(C3));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D7;
 }(C3));
@@ -236,21 +243,24 @@ var D7 = (function (_super) {
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D8;
 }(C3));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D9;
 }(C3));
 var D10 = (function (_super) {
     __extends(D10, _super);
     function D10() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D10;
 }(C3));
@@ -259,21 +269,24 @@ var D10 = (function (_super) {
 var D11 = (function (_super) {
     __extends(D11, _super);
     function D11() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D11;
 }(C3));
 var D12 = (function (_super) {
     __extends(D12, _super);
     function D12() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D12;
 }(C3));
 var D13 = (function (_super) {
     __extends(D13, _super);
     function D13() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D13;
 }(C3));
@@ -283,28 +296,32 @@ var D13 = (function (_super) {
 var D14 = (function (_super) {
     __extends(D14, _super);
     function D14() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D14;
 }(C3));
 var D15 = (function (_super) {
     __extends(D15, _super);
     function D15() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D15;
 }(C3));
 var D16 = (function (_super) {
     __extends(D16, _super);
     function D16() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D16;
 }(C3));
 var D17 = (function (_super) {
     __extends(D17, _super);
     function D17() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D17;
 }(C3));
@@ -313,28 +330,32 @@ var D17 = (function (_super) {
 var D18 = (function (_super) {
     __extends(D18, _super);
     function D18() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D18;
 }(C3));
 var D19 = (function (_super) {
     __extends(D19, _super);
     function D19() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D19;
 }(C3));
 var D20 = (function (_super) {
     __extends(D20, _super);
     function D20() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D20;
 }(C3));
 var D21 = (function (_super) {
     __extends(D21, _super);
     function D21() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D21;
 }(C3));
@@ -343,28 +364,32 @@ var D21 = (function (_super) {
 var D22 = (function (_super) {
     __extends(D22, _super);
     function D22() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D22;
 }(C3));
 var D23 = (function (_super) {
     __extends(D23, _super);
     function D23() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D23;
 }(C3));
 var D24 = (function (_super) {
     __extends(D24, _super);
     function D24() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D24;
 }(C3));
 var D25 = (function (_super) {
     __extends(D25, _super);
     function D25() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D25;
 }(C3));
@@ -373,28 +398,32 @@ var D25 = (function (_super) {
 var D26 = (function (_super) {
     __extends(D26, _super);
     function D26() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D26;
 }(C3));
 var D27 = (function (_super) {
     __extends(D27, _super);
     function D27() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D27;
 }(C3));
 var D28 = (function (_super) {
     __extends(D28, _super);
     function D28() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D28;
 }(C3));
 var D29 = (function (_super) {
     __extends(D29, _super);
     function D29() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D29;
 }(C3));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
index f388bd4e04759..e4e35262d80d6 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
@@ -118,63 +118,72 @@ var B1 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(B1));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D3;
 }(B1));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D4;
 }(B1));
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D5;
 }(B1));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D6;
 }(B1));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D7;
 }(B1));
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D8;
 }(B1));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D9;
 }(B1));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js b/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
index cffda7d7f5527..0d1347cd33c91 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
@@ -217,63 +217,72 @@ var M1;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D1;
     }(Base));
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D2;
     }(Base));
     var D3 = (function (_super) {
         __extends(D3, _super);
         function D3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D3;
     }(Base));
     var D4 = (function (_super) {
         __extends(D4, _super);
         function D4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D4;
     }(Base));
     var D5 = (function (_super) {
         __extends(D5, _super);
         function D5() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D5;
     }(Base));
     var D6 = (function (_super) {
         __extends(D6, _super);
         function D6() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D6;
     }(Base));
     var D7 = (function (_super) {
         __extends(D7, _super);
         function D7() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D7;
     }(Base));
     var D8 = (function (_super) {
         __extends(D8, _super);
         function D8() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D8;
     }(Base));
     var D9 = (function (_super) {
         __extends(D9, _super);
         function D9() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D9;
     }(Base));
@@ -288,63 +297,72 @@ var M2;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D1;
     }(Base2));
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D2;
     }(Base2));
     var D3 = (function (_super) {
         __extends(D3, _super);
         function D3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D3;
     }(Base2));
     var D4 = (function (_super) {
         __extends(D4, _super);
         function D4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D4;
     }(Base2));
     var D5 = (function (_super) {
         __extends(D5, _super);
         function D5() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D5;
     }(Base2));
     var D6 = (function (_super) {
         __extends(D6, _super);
         function D6() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D6;
     }(Base2));
     var D7 = (function (_super) {
         __extends(D7, _super);
         function D7() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D7;
     }(Base2));
     var D8 = (function (_super) {
         __extends(D8, _super);
         function D8() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D8;
     }(Base2));
     var D9 = (function (_super) {
         __extends(D9, _super);
         function D9() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return D9;
     }(Base2));
diff --git a/tests/baselines/reference/subtypingTransitivity.js b/tests/baselines/reference/subtypingTransitivity.js
index 9d3df207a0ce1..9ba7ac52df58a 100644
--- a/tests/baselines/reference/subtypingTransitivity.js
+++ b/tests/baselines/reference/subtypingTransitivity.js
@@ -33,14 +33,16 @@ var B = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(B));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(B));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures2.js b/tests/baselines/reference/subtypingWithCallSignatures2.js
index 014ce4a30038f..d4cd66a5e0a41 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures2.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures2.js
@@ -187,21 +187,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures3.js b/tests/baselines/reference/subtypingWithCallSignatures3.js
index 55f5fa60e7154..93b1cbebd0aad 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures3.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures3.js
@@ -136,21 +136,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures4.js b/tests/baselines/reference/subtypingWithCallSignatures4.js
index b8839316e8669..5cab9f1e7c483 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures4.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures4.js
@@ -126,21 +126,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures2.js b/tests/baselines/reference/subtypingWithConstructSignatures2.js
index c4168febf4eea..ec551f5f58cbf 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures2.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures2.js
@@ -187,21 +187,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures3.js b/tests/baselines/reference/subtypingWithConstructSignatures3.js
index 171e52505e0a9..ba833c31e7a60 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures3.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures3.js
@@ -138,21 +138,24 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures4.js b/tests/baselines/reference/subtypingWithConstructSignatures4.js
index 1152dde04dd29..0b624fcbc51ad 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures4.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures4.js
@@ -126,21 +126,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures5.js b/tests/baselines/reference/subtypingWithConstructSignatures5.js
index 24a5ce77dd00d..3d2d4d50d6e91 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures5.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures5.js
@@ -64,21 +64,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures6.js b/tests/baselines/reference/subtypingWithConstructSignatures6.js
index 8778255dbd576..1cec204ff877e 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures6.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures6.js
@@ -67,21 +67,24 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer.js b/tests/baselines/reference/subtypingWithNumericIndexer.js
index cd447c116daee..2aa4d834395a4 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer.js
@@ -54,14 +54,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A));
@@ -75,28 +77,32 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B4;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer3.js b/tests/baselines/reference/subtypingWithNumericIndexer3.js
index 104141b761d5f..60f463546c856 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer3.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer3.js
@@ -58,14 +58,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A));
@@ -79,35 +81,40 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B4;
     }(A));
     var B5 = (function (_super) {
         __extends(B5, _super);
         function B5() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B5;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer4.js b/tests/baselines/reference/subtypingWithNumericIndexer4.js
index 59f8cd95ad01d..f40804bd55f0f 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer4.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer4.js
@@ -42,7 +42,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -56,14 +57,16 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithObjectMembers.js b/tests/baselines/reference/subtypingWithObjectMembers.js
index c3cef6601e6b0..420be798293c0 100644
--- a/tests/baselines/reference/subtypingWithObjectMembers.js
+++ b/tests/baselines/reference/subtypingWithObjectMembers.js
@@ -81,14 +81,16 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Derived));
@@ -102,7 +104,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -114,7 +117,8 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A2));
@@ -126,7 +130,8 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B3;
 }(A3));
@@ -140,7 +145,8 @@ var TwoLevels;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
@@ -152,7 +158,8 @@ var TwoLevels;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A2));
@@ -164,7 +171,8 @@ var TwoLevels;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembers4.js b/tests/baselines/reference/subtypingWithObjectMembers4.js
index d5c1107e45d56..0bb50afe98540 100644
--- a/tests/baselines/reference/subtypingWithObjectMembers4.js
+++ b/tests/baselines/reference/subtypingWithObjectMembers4.js
@@ -48,7 +48,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -60,7 +61,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -72,7 +74,8 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A2));
@@ -84,7 +87,8 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js b/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
index 25faacad88e4c..ec3b8382ecab1 100644
--- a/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
+++ b/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
@@ -48,7 +48,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -60,7 +61,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -72,7 +74,8 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A2));
@@ -84,7 +87,8 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js b/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
index 7b0398143a28c..24f36819ff655 100644
--- a/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
+++ b/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
@@ -76,7 +76,8 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -90,7 +91,8 @@ var ExplicitPublic;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
@@ -102,7 +104,8 @@ var ExplicitPublic;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A2));
@@ -114,7 +117,8 @@ var ExplicitPublic;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A3));
@@ -129,7 +133,8 @@ var ImplicitPublic;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
@@ -141,7 +146,8 @@ var ImplicitPublic;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A2));
@@ -153,7 +159,8 @@ var ImplicitPublic;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A3));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer.js b/tests/baselines/reference/subtypingWithStringIndexer.js
index 0740743a5d9c3..95a71a018d162 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer.js
@@ -55,14 +55,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A));
@@ -76,28 +78,32 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B4;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer3.js b/tests/baselines/reference/subtypingWithStringIndexer3.js
index 5ed44177d5283..fd9b400cb3da8 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer3.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer3.js
@@ -58,14 +58,16 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B2;
 }(A));
@@ -79,35 +81,40 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B4;
     }(A));
     var B5 = (function (_super) {
         __extends(B5, _super);
         function B5() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B5;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer4.js b/tests/baselines/reference/subtypingWithStringIndexer4.js
index d6fb874c0900b..46178d1dc321a 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer4.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer4.js
@@ -42,7 +42,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -56,14 +57,16 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B3;
     }(A));
diff --git a/tests/baselines/reference/super.js b/tests/baselines/reference/super.js
index 81d76aec62bc3..54afddcc11913 100644
--- a/tests/baselines/reference/super.js
+++ b/tests/baselines/reference/super.js
@@ -58,7 +58,8 @@ var Base = (function () {
 var Sub1 = (function (_super) {
     __extends(Sub1, _super);
     function Sub1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Sub1.prototype.foo = function () {
         return "sub1" + _super.prototype.foo.call(this) + _super.prototype.bar.call(this);
@@ -68,7 +69,8 @@ var Sub1 = (function (_super) {
 var SubSub1 = (function (_super) {
     __extends(SubSub1, _super);
     function SubSub1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubSub1.prototype.foo = function () {
         return "subsub1" + _super.prototype.foo.call(this);
diff --git a/tests/baselines/reference/super1.js b/tests/baselines/reference/super1.js
index 4179843b79a02..8ef621cdf2b51 100644
--- a/tests/baselines/reference/super1.js
+++ b/tests/baselines/reference/super1.js
@@ -84,7 +84,8 @@ var Base1 = (function () {
 var Sub1 = (function (_super) {
     __extends(Sub1, _super);
     function Sub1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Sub1.prototype.bar = function () {
         return "base";
@@ -94,7 +95,8 @@ var Sub1 = (function (_super) {
 var SubSub1 = (function (_super) {
     __extends(SubSub1, _super);
     function SubSub1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubSub1.prototype.bar = function () {
         return _super.prototype.super.foo;
@@ -113,7 +115,8 @@ var Base2 = (function () {
 var SubE2 = (function (_super) {
     __extends(SubE2, _super);
     function SubE2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubE2.prototype.bar = function () {
         return _super.prototype.prototype.foo = null;
@@ -132,7 +135,8 @@ var Base3 = (function () {
 var SubE3 = (function (_super) {
     __extends(SubE3, _super);
     function SubE3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubE3.prototype.bar = function () {
         return _super.prototype.bar.call(this);
@@ -153,7 +157,8 @@ var Base4;
     var SubSub4 = (function (_super) {
         __extends(SubSub4, _super);
         function SubSub4() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         SubSub4.prototype.x = function () {
             return _super.prototype.x.call(this);
diff --git a/tests/baselines/reference/super2.js b/tests/baselines/reference/super2.js
index 979bdba84e418..80e26c36f7c89 100644
--- a/tests/baselines/reference/super2.js
+++ b/tests/baselines/reference/super2.js
@@ -71,7 +71,8 @@ var Base5 = (function () {
 var Sub5 = (function (_super) {
     __extends(Sub5, _super);
     function Sub5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Sub5.prototype.x = function () {
         return "SubX";
@@ -81,7 +82,8 @@ var Sub5 = (function (_super) {
 var SubSub5 = (function (_super) {
     __extends(SubSub5, _super);
     function SubSub5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubSub5.prototype.x = function () {
         return _super.prototype.x.call(this);
@@ -103,7 +105,8 @@ var Base6 = (function () {
 var Sub6 = (function (_super) {
     __extends(Sub6, _super);
     function Sub6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Sub6.prototype.y = function () {
         return "SubY";
@@ -113,7 +116,8 @@ var Sub6 = (function (_super) {
 var SubSub6 = (function (_super) {
     __extends(SubSub6, _super);
     function SubSub6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SubSub6.prototype.y = function () {
         return _super.prototype.y.call(this);
diff --git a/tests/baselines/reference/superAccess.js b/tests/baselines/reference/superAccess.js
index 6e5cd9aca4476..8c9d93f3a36a2 100644
--- a/tests/baselines/reference/superAccess.js
+++ b/tests/baselines/reference/superAccess.js
@@ -30,7 +30,8 @@ MyBase.S1 = 5;
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MyDerived.prototype.foo = function () {
         var l3 = _super.prototype.S1; // Expected => Error: Only public instance methods of the base class are accessible via the 'super' keyword
diff --git a/tests/baselines/reference/superAccess2.js b/tests/baselines/reference/superAccess2.js
index 8de13b5ef51cc..ff711ca8d75ac 100644
--- a/tests/baselines/reference/superAccess2.js
+++ b/tests/baselines/reference/superAccess2.js
@@ -41,11 +41,11 @@ var Q = (function (_super) {
     __extends(Q, _super);
     // Super is not allowed in constructor args
     function Q(z, zz, zzz) {
-        var _this = this;
+        var _this;
         if (z === void 0) { z = _super.; }
         if (zz === void 0) { zz = _super.; }
         if (zzz === void 0) { zzz = function () { return _super.; }; }
-        _super.call(this);
+        _this = _super.call(this) || this;
         this.z = z;
         this.xx = _super.prototype.;
     }
diff --git a/tests/baselines/reference/superAccessInFatArrow1.js b/tests/baselines/reference/superAccessInFatArrow1.js
index 3cd4e199c6218..be97707b12a55 100644
--- a/tests/baselines/reference/superAccessInFatArrow1.js
+++ b/tests/baselines/reference/superAccessInFatArrow1.js
@@ -34,7 +34,8 @@ var test;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         B.prototype.bar = function (callback) {
         };
diff --git a/tests/baselines/reference/superCallArgsMustMatch.js b/tests/baselines/reference/superCallArgsMustMatch.js
index 9dcdbda8e31ae..3dec9369dd427 100644
--- a/tests/baselines/reference/superCallArgsMustMatch.js
+++ b/tests/baselines/reference/superCallArgsMustMatch.js
@@ -40,9 +40,10 @@ var T5 = (function () {
 var T6 = (function (_super) {
     __extends(T6, _super);
     function T6() {
+        var _this;
         // Should error; base constructor has type T for first arg,
         // which is instantiated with 'number' in the extends clause
-        _super.call(this, "hi");
+        _this = _super.call(this, "hi") || this;
         var x = this.foo;
     }
     return T6;
diff --git a/tests/baselines/reference/superCallAssignResult.js b/tests/baselines/reference/superCallAssignResult.js
index 7002f94eb7d45..4eeabdfa2822c 100644
--- a/tests/baselines/reference/superCallAssignResult.js
+++ b/tests/baselines/reference/superCallAssignResult.js
@@ -24,7 +24,8 @@ var E = (function () {
 var H = (function (_super) {
     __extends(H, _super);
     function H() {
-        var x = _super.call(this, 5); // Should be of type void, not E.
+        var _this;
+        var x = _this = _super.call(this, 5) || this; // Should be of type void, not E.
         x = 5;
     }
     return H;
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing1.js b/tests/baselines/reference/superCallBeforeThisAccessing1.js
index 1fc7ab39c9179..e70dde9fd8e13 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing1.js
@@ -30,7 +30,8 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this, i);
+        var _this;
+        _this = _super.call(this, i) || this;
         var s = {
             t: this._t
         };
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing2.js b/tests/baselines/reference/superCallBeforeThisAccessing2.js
index e5acf06bbfd49..8ab6c5f349c25 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing2.js
@@ -24,8 +24,8 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = this;
-        _super.call(this, function () { _this._t; }); // no error. only check when this is directly accessing in constructor
+        var _this;
+        _this = _super.call(this, function () { _this._t; }) || this; // no error. only check when this is directly accessing in constructor
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing3.js b/tests/baselines/reference/superCallBeforeThisAccessing3.js
index 101d74e4bc724..1f4c81149133a 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing3.js
@@ -27,11 +27,11 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = this;
+        var _this;
         var x = function () { _this._t; };
         x(); // no error; we only check super is called before this when the container is a constructor
         this._t; // error
-        _super.call(this, undefined);
+        _this = _super.call(this, undefined) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing4.js b/tests/baselines/reference/superCallBeforeThisAccessing4.js
index 9c3c5ab60c4c9..2645eaa9795dc 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing4.js
@@ -24,15 +24,17 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         this._t;
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return D;
 }(null));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this._t;
     }
     return E;
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing5.js b/tests/baselines/reference/superCallBeforeThisAccessing5.js
index 3281a3f8b55da..df345ec5c26b8 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing5.js
@@ -16,6 +16,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         this._t; // No error
     }
     return D;
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index 746ce9f2791f1..d4e8c97955262 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -24,7 +24,8 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this, this);
+        var _this;
+        _this = _super.call(this, this) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing7.js b/tests/baselines/reference/superCallBeforeThisAccessing7.js
index c3aa1655cf75c..f6c41b144eba4 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing7.js
@@ -27,10 +27,11 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         var x = {
             j: this._t
         };
-        _super.call(this, undefined);
+        _this = _super.call(this, undefined) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing8.js b/tests/baselines/reference/superCallBeforeThisAccessing8.js
index 0865c4305a5ff..7d09351621a64 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing8.js
@@ -27,8 +27,9 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         var x = {
-            k: _super.call(this, undefined),
+            k: _this = _super.call(this, undefined) || this,
             j: this._t
         };
     }
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
index 50830480b1a47..6de41cb518831 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
@@ -20,7 +20,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
index ef77098588896..5ae8f8b38748e 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
@@ -19,7 +19,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
index ebb70023b538a..bc85d74c4c8c7 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
@@ -25,7 +25,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.call(this, function (value) { return String(value); });
+        var _this;
+        _this = _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
index d619343ba142b..a1736bb45f021 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
@@ -25,7 +25,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.call(this, function (value) { return String(value); });
+        var _this;
+        _this = _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
index e9ee84be15224..c5beb5df5b5ba 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
@@ -25,7 +25,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.call(this, function (value) { return String(value); });
+        var _this;
+        _this = _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatHasNoBaseType1.js b/tests/baselines/reference/superCallFromClassThatHasNoBaseType1.js
index d793e9bb2ae0b..e4b358c9a0a61 100644
--- a/tests/baselines/reference/superCallFromClassThatHasNoBaseType1.js
+++ b/tests/baselines/reference/superCallFromClassThatHasNoBaseType1.js
@@ -19,7 +19,7 @@ var A = (function () {
 }());
 var B = (function () {
     function B() {
-        _super.call(this, function (value) { return String(value); });
+        _this = _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }());
diff --git a/tests/baselines/reference/superCallFromFunction1.js b/tests/baselines/reference/superCallFromFunction1.js
index a7fcbaaeff0d5..7f34628c58a89 100644
--- a/tests/baselines/reference/superCallFromFunction1.js
+++ b/tests/baselines/reference/superCallFromFunction1.js
@@ -6,5 +6,5 @@ function foo() {
 
 //// [superCallFromFunction1.js]
 function foo() {
-    _super.call(this, function (value) { return String(value); });
+    _this = _super.call(this, function (value) { return String(value); }) || this;
 }
diff --git a/tests/baselines/reference/superCallInConstructorWithNoBaseType.js b/tests/baselines/reference/superCallInConstructorWithNoBaseType.js
index 9746ab6a9de5d..dcbebeaa452e6 100644
--- a/tests/baselines/reference/superCallInConstructorWithNoBaseType.js
+++ b/tests/baselines/reference/superCallInConstructorWithNoBaseType.js
@@ -14,13 +14,13 @@ class D<T> {
 //// [superCallInConstructorWithNoBaseType.js]
 var C = (function () {
     function C() {
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
     }
     return C;
 }());
 var D = (function () {
     function D(x) {
-        _super.call(this); // error
+        _this = _super.call(this) || this; // error
         this.x = x;
     }
     return D;
diff --git a/tests/baselines/reference/superCallInNonStaticMethod.js b/tests/baselines/reference/superCallInNonStaticMethod.js
index 3ff07edf4c9ef..6640a32be5a02 100644
--- a/tests/baselines/reference/superCallInNonStaticMethod.js
+++ b/tests/baselines/reference/superCallInNonStaticMethod.js
@@ -66,8 +66,8 @@ var Doing = (function () {
 var Other = (function (_super) {
     __extends(Other, _super);
     function Other() {
-        var _this = this;
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.propertyInitializer = _super.prototype.instanceMethod.call(this);
         this.functionProperty = function () { _super.prototype.instanceMethod.call(_this); };
         _super.prototype.instanceMethod.call(this);
diff --git a/tests/baselines/reference/superCallInStaticMethod.js b/tests/baselines/reference/superCallInStaticMethod.js
index 91558e47d3f88..6cf9f79e7a413 100644
--- a/tests/baselines/reference/superCallInStaticMethod.js
+++ b/tests/baselines/reference/superCallInStaticMethod.js
@@ -62,7 +62,8 @@ var Doing = (function () {
 var Other = (function (_super) {
     __extends(Other, _super);
     function Other() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     // in static method
     Other.staticMethod = function () {
diff --git a/tests/baselines/reference/superCallInsideClassDeclaration.js b/tests/baselines/reference/superCallInsideClassDeclaration.js
index e677c426e0241..f47b50d4915d4 100644
--- a/tests/baselines/reference/superCallInsideClassDeclaration.js
+++ b/tests/baselines/reference/superCallInsideClassDeclaration.js
@@ -35,10 +35,12 @@ var C = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         var D = (function (_super) {
             __extends(D, _super);
             function D() {
-                _super.call(this);
+                var _this;
+                _this = _super.call(this) || this;
             }
             return D;
         }(C));
diff --git a/tests/baselines/reference/superCallInsideClassExpression.js b/tests/baselines/reference/superCallInsideClassExpression.js
index ee373f69f4600..b9e1f6c97866f 100644
--- a/tests/baselines/reference/superCallInsideClassExpression.js
+++ b/tests/baselines/reference/superCallInsideClassExpression.js
@@ -35,10 +35,12 @@ var C = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         var D = (function (_super) {
             __extends(class_1, _super);
             function class_1() {
-                _super.call(this);
+                var _this;
+                _this = _super.call(this) || this;
             }
             return class_1;
         }(C));
diff --git a/tests/baselines/reference/superCallInsideObjectLiteralExpression.js b/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
index 3f9a0a9ce9c87..68a9c19e819cb 100644
--- a/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
+++ b/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
@@ -28,8 +28,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         var x = {
-            x: _super.call(this)
+            x: _this = _super.call(this) || this
         };
     }
     return B;
diff --git a/tests/baselines/reference/superCallOutsideConstructor.js b/tests/baselines/reference/superCallOutsideConstructor.js
index 202ed531a10c2..fd91de4cc8e1d 100644
--- a/tests/baselines/reference/superCallOutsideConstructor.js
+++ b/tests/baselines/reference/superCallOutsideConstructor.js
@@ -37,13 +37,14 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
-        this.x = _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
+        this.x = _this = _super.call(this) || this;
         var y = function () {
-            _super.call(this);
+            _this = _super.call(_this) || _this;
         };
         var y2 = function () {
-            _super.call(this);
+            _this = _super.call(this) || this;
         };
     }
     return D;
diff --git a/tests/baselines/reference/superCallParameterContextualTyping1.js b/tests/baselines/reference/superCallParameterContextualTyping1.js
index 5bfe3927a512e..a311ce95fc733 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping1.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping1.js
@@ -28,7 +28,8 @@ var B = (function (_super) {
     __extends(B, _super);
     // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
     function B() {
-        _super.call(this, function (value) { return String(value.toExponential()); });
+        var _this;
+        _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping2.js b/tests/baselines/reference/superCallParameterContextualTyping2.js
index 539ecbed065e4..9439871f38c28 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping2.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping2.js
@@ -27,7 +27,8 @@ var C = (function (_super) {
     __extends(C, _super);
     // Ensure 'value' is not of type 'any' by invoking it with type arguments.
     function C() {
-        _super.call(this, function (value) { return String(value()); });
+        var _this;
+        _this = _super.call(this, function (value) { return String(value()); }) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping3.js b/tests/baselines/reference/superCallParameterContextualTyping3.js
index d35a1707bb74c..cfa3fd1c07431 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping3.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping3.js
@@ -47,13 +47,14 @@ var CBase = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
+        var _this;
         // Should be okay.
         // 'p' should have type 'string'.
-        _super.call(this, {
+        _this = _super.call(this, {
             method: function (p) {
                 p.length;
             }
-        });
+        }) || this;
         // Should be okay.
         // 'p' should have type 'string'.
         _super.prototype.foo.call(this, {
diff --git a/tests/baselines/reference/superCallWithMissingBaseClass.js b/tests/baselines/reference/superCallWithMissingBaseClass.js
index 7758bcfd89d99..561b7300fe428 100644
--- a/tests/baselines/reference/superCallWithMissingBaseClass.js
+++ b/tests/baselines/reference/superCallWithMissingBaseClass.js
@@ -18,7 +18,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Foo.prototype.m1 = function () {
         return _super.prototype.m1.call(this);
diff --git a/tests/baselines/reference/superCalls.js b/tests/baselines/reference/superCalls.js
index ae8327ec20022..96b0061f47e90 100644
--- a/tests/baselines/reference/superCalls.js
+++ b/tests/baselines/reference/superCalls.js
@@ -47,10 +47,11 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     //super call in class constructor of derived type
     function Derived(q) {
-        _super.call(this, '');
+        var _this;
+        _this = _super.call(this, '') || this;
         this.q = q;
         //type of super call expression is void
-        var p = _super.call(this, '');
+        var p = _this = _super.call(this, '') || this;
         var p = v();
     }
     return Derived;
@@ -63,8 +64,9 @@ var OtherBase = (function () {
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
+        var _this;
         var p = '';
-        _super.call(this);
+        _this = _super.call(this) || this;
     }
     return OtherDerived;
 }(OtherBase));
diff --git a/tests/baselines/reference/superCallsInConstructor.js b/tests/baselines/reference/superCallsInConstructor.js
index 434f730c76b82..be34657a0c1db 100644
--- a/tests/baselines/reference/superCallsInConstructor.js
+++ b/tests/baselines/reference/superCallsInConstructor.js
@@ -41,14 +41,15 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
+        var _this;
         with (new C()) {
             foo();
-            _super.call(this);
+            _this = _super.call(this) || this;
             bar();
         }
         try { }
         catch (e) {
-            _super.call(this);
+            _this = _super.call(this) || this;
         }
     }
     return Derived;
diff --git a/tests/baselines/reference/superErrors.js b/tests/baselines/reference/superErrors.js
index fd70114d0fd0c..f962876a391c0 100644
--- a/tests/baselines/reference/superErrors.js
+++ b/tests/baselines/reference/superErrors.js
@@ -76,7 +76,8 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.name = "Frank";
         // super call in an inner function in a constructor
         function inner() {
diff --git a/tests/baselines/reference/superInCatchBlock1.js b/tests/baselines/reference/superInCatchBlock1.js
index 9d5cb1affdcaa..9eb7df62c1ab9 100644
--- a/tests/baselines/reference/superInCatchBlock1.js
+++ b/tests/baselines/reference/superInCatchBlock1.js
@@ -28,7 +28,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.m = function () {
         try {
diff --git a/tests/baselines/reference/superInConstructorParam1.js b/tests/baselines/reference/superInConstructorParam1.js
index 3c6eb0bdad2c2..ab1744929a995 100644
--- a/tests/baselines/reference/superInConstructorParam1.js
+++ b/tests/baselines/reference/superInConstructorParam1.js
@@ -27,6 +27,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C(a) {
+        var _this;
         if (a === void 0) { a = _super.foo.call(this); }
     }
     return C;
diff --git a/tests/baselines/reference/superInLambdas.js b/tests/baselines/reference/superInLambdas.js
index b0940b1d53809..f2c84cb7e64ba 100644
--- a/tests/baselines/reference/superInLambdas.js
+++ b/tests/baselines/reference/superInLambdas.js
@@ -85,8 +85,8 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        var _this = this;
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.name = "Frank";
         // super call in a constructor
         _super.prototype.sayHello.call(this);
@@ -105,8 +105,8 @@ var RegisteredUser = (function (_super) {
 var RegisteredUser2 = (function (_super) {
     __extends(RegisteredUser2, _super);
     function RegisteredUser2() {
-        var _this = this;
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.name = "Joe";
         // super call in a nested lambda in a constructor 
         var x = function () { return function () { return function () { return _super.prototype.sayHello.call(_this); }; }; };
@@ -121,8 +121,8 @@ var RegisteredUser2 = (function (_super) {
 var RegisteredUser3 = (function (_super) {
     __extends(RegisteredUser3, _super);
     function RegisteredUser3() {
-        var _this = this;
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.name = "Sam";
         // super property in a nested lambda in a constructor 
         var superName = function () { return function () { return function () { return _super.prototype.name; }; }; };
@@ -137,8 +137,8 @@ var RegisteredUser3 = (function (_super) {
 var RegisteredUser4 = (function (_super) {
     __extends(RegisteredUser4, _super);
     function RegisteredUser4() {
-        var _this = this;
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         this.name = "Mark";
         // super in a nested lambda in a constructor 
         var x = function () { return function () { return _super.prototype.; }; };
diff --git a/tests/baselines/reference/superInObjectLiterals_ES5.js b/tests/baselines/reference/superInObjectLiterals_ES5.js
index 5d1fed24b4f1a..adeda5835cb83 100644
--- a/tests/baselines/reference/superInObjectLiterals_ES5.js
+++ b/tests/baselines/reference/superInObjectLiterals_ES5.js
@@ -100,7 +100,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.f = function () {
         var _this = this;
diff --git a/tests/baselines/reference/superNewCall1.js b/tests/baselines/reference/superNewCall1.js
index 01ae169b598d5..32c4da4d4e4ed 100644
--- a/tests/baselines/reference/superNewCall1.js
+++ b/tests/baselines/reference/superNewCall1.js
@@ -27,6 +27,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
+        var _this;
         new _super.prototype(function (value) { return String(value); });
     }
     return B;
diff --git a/tests/baselines/reference/superPropertyAccess.js b/tests/baselines/reference/superPropertyAccess.js
index 0e1e878344860..b1377eb9cde35 100644
--- a/tests/baselines/reference/superPropertyAccess.js
+++ b/tests/baselines/reference/superPropertyAccess.js
@@ -61,7 +61,8 @@ var MyBase = (function () {
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MyDerived.prototype.foo = function () {
         _super.prototype.m1.call(this, "hi"); // Should be allowed, method on base prototype
diff --git a/tests/baselines/reference/superPropertyAccess1.js b/tests/baselines/reference/superPropertyAccess1.js
index 4df9398024c84..86f059a2fb22b 100644
--- a/tests/baselines/reference/superPropertyAccess1.js
+++ b/tests/baselines/reference/superPropertyAccess1.js
@@ -50,7 +50,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype.bar.call(this);
         _super.prototype.x; // error
     }
diff --git a/tests/baselines/reference/superPropertyAccess2.js b/tests/baselines/reference/superPropertyAccess2.js
index ec74a2ea0694b..be0c44b40818e 100644
--- a/tests/baselines/reference/superPropertyAccess2.js
+++ b/tests/baselines/reference/superPropertyAccess2.js
@@ -50,7 +50,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         _super.prototype.bar.call(this); // error
         _super.prototype.x; // error
     }
diff --git a/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js b/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
index a91dfc76e3daf..1397a0748ae5e 100644
--- a/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
+++ b/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
@@ -29,7 +29,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     B.prototype.foo = function () { return 2; };
     B.prototype.bar = function () {
diff --git a/tests/baselines/reference/superPropertyAccessNoError.js b/tests/baselines/reference/superPropertyAccessNoError.js
index df230ce3703db..f7663eab6e057 100644
--- a/tests/baselines/reference/superPropertyAccessNoError.js
+++ b/tests/baselines/reference/superPropertyAccessNoError.js
@@ -99,7 +99,8 @@ var SomeBaseClass = (function () {
 var SomeDerivedClass = (function (_super) {
     __extends(SomeDerivedClass, _super);
     function SomeDerivedClass() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var x = _super.prototype.func.call(this);
         var x;
     }
diff --git a/tests/baselines/reference/superPropertyAccess_ES5.js b/tests/baselines/reference/superPropertyAccess_ES5.js
index 63f5f6f316aae..14492c2788ab1 100644
--- a/tests/baselines/reference/superPropertyAccess_ES5.js
+++ b/tests/baselines/reference/superPropertyAccess_ES5.js
@@ -49,7 +49,8 @@ var MyBase = (function () {
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
         var f1 = _super.prototype.getValue.call(this);
         var f2 = _super.prototype.value;
     }
@@ -71,7 +72,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(B.prototype, "property", {
         set: function (value) {
diff --git a/tests/baselines/reference/superSymbolIndexedAccess5.js b/tests/baselines/reference/superSymbolIndexedAccess5.js
index 3acd26d297456..0796c912d8cfa 100644
--- a/tests/baselines/reference/superSymbolIndexedAccess5.js
+++ b/tests/baselines/reference/superSymbolIndexedAccess5.js
@@ -31,7 +31,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Bar.prototype[symbol] = function () {
         return _super.prototype[symbol].call(this);
diff --git a/tests/baselines/reference/superSymbolIndexedAccess6.js b/tests/baselines/reference/superSymbolIndexedAccess6.js
index 8b04075c41193..ee376cec2cb27 100644
--- a/tests/baselines/reference/superSymbolIndexedAccess6.js
+++ b/tests/baselines/reference/superSymbolIndexedAccess6.js
@@ -31,7 +31,8 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Bar[symbol] = function () {
         return _super[symbol].call(this);
diff --git a/tests/baselines/reference/superWithGenericSpecialization.js b/tests/baselines/reference/superWithGenericSpecialization.js
index a54ee1bbcbc94..499c0a6de1fd0 100644
--- a/tests/baselines/reference/superWithGenericSpecialization.js
+++ b/tests/baselines/reference/superWithGenericSpecialization.js
@@ -28,7 +28,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this); // uses the type parameter type of the base class, ie string
+        var _this;
+        _this = _super.call(this) || this; // uses the type parameter type of the base class, ie string
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithGenerics.js b/tests/baselines/reference/superWithGenerics.js
index b4fe56bee4c0a..471c7cd36acfa 100644
--- a/tests/baselines/reference/superWithGenerics.js
+++ b/tests/baselines/reference/superWithGenerics.js
@@ -20,7 +20,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.call(this);
+        var _this;
+        _this = _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superWithTypeArgument.js b/tests/baselines/reference/superWithTypeArgument.js
index 766b5f7920e28..a4acd321f503f 100644
--- a/tests/baselines/reference/superWithTypeArgument.js
+++ b/tests/baselines/reference/superWithTypeArgument.js
@@ -23,6 +23,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         _super.prototype..call(this);
     }
     return D;
diff --git a/tests/baselines/reference/superWithTypeArgument2.js b/tests/baselines/reference/superWithTypeArgument2.js
index e0d2a40633f32..ca399c4de78c0 100644
--- a/tests/baselines/reference/superWithTypeArgument2.js
+++ b/tests/baselines/reference/superWithTypeArgument2.js
@@ -23,6 +23,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D(x) {
+        var _this;
         _super.prototype..call(this, x);
     }
     return D;
diff --git a/tests/baselines/reference/superWithTypeArgument3.js b/tests/baselines/reference/superWithTypeArgument3.js
index 586dc595b3976..5a124586d0cfb 100644
--- a/tests/baselines/reference/superWithTypeArgument3.js
+++ b/tests/baselines/reference/superWithTypeArgument3.js
@@ -28,6 +28,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
+        var _this;
         _super.prototype..call(this);
     }
     D.prototype.bar = function () {
diff --git a/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js b/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
index db6db37ac8a58..ed71cebe3c78a 100644
--- a/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
+++ b/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
@@ -57,7 +57,8 @@ var F = (function () {
 var SuperObjectTest = (function (_super) {
     __extends(SuperObjectTest, _super);
     function SuperObjectTest() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     SuperObjectTest.prototype.testing = function () {
         var test = {
diff --git a/tests/baselines/reference/switchStatements.js b/tests/baselines/reference/switchStatements.js
index 093a7fb2f2c19..7aac6cb47e0c2 100644
--- a/tests/baselines/reference/switchStatements.js
+++ b/tests/baselines/reference/switchStatements.js
@@ -98,7 +98,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/systemModuleWithSuperClass.js b/tests/baselines/reference/systemModuleWithSuperClass.js
index 31cd542d2e23b..59aff947e5c06 100644
--- a/tests/baselines/reference/systemModuleWithSuperClass.js
+++ b/tests/baselines/reference/systemModuleWithSuperClass.js
@@ -49,7 +49,8 @@ System.register(["./foo"], function (exports_1, context_1) {
             Bar = (function (_super) {
                 __extends(Bar, _super);
                 function Bar() {
-                    _super.apply(this, arguments);
+                    var _this = _super.apply(this, arguments) || this;
+                    return _this;
                 }
                 return Bar;
             }(foo_1.Foo));
diff --git a/tests/baselines/reference/targetTypeBaseCalls.js b/tests/baselines/reference/targetTypeBaseCalls.js
index d028c04d711d8..a9bbc34123fbe 100644
--- a/tests/baselines/reference/targetTypeBaseCalls.js
+++ b/tests/baselines/reference/targetTypeBaseCalls.js
@@ -35,7 +35,8 @@ new Foo(function (s) { s = 5; }); // error, if types are applied correctly
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        _super.call(this, function (s) { s = 5; });
+        var _this;
+        _this = _super.call(this, function (s) { s = 5; }) || this;
     }
     return Bar;
 }(Foo)); // error, if types are applied correctly
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 76eeef0139c76..2a86b144ae51d 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -70,7 +70,8 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        _super.call(this, this); // Error
+        var _this;
+        _this = _super.call(this, this) || this; // Error
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -78,7 +79,8 @@ var ClassWithInitializer = (function (_super) {
     __extends(ClassWithInitializer, _super);
     //'this' in required super call
     function ClassWithInitializer() {
-        _super.call(this, this); // Error
+        var _this;
+        _this = _super.call(this, this) || this; // Error
         this.t = 4;
     }
     return ClassWithInitializer;
@@ -96,7 +98,8 @@ genericFunc(undefined); // Should be an error
 var ErrClass3 = (function (_super) {
     __extends(ErrClass3, _super);
     function ErrClass3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ErrClass3;
 }(this));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index 634b5ef0a2024..3748ebaa42f6b 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -71,7 +71,8 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        _super.call(this, this); // error: "super" has to be called before "this" accessing
+        var _this;
+        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -79,7 +80,8 @@ var ClassWithInitializer = (function (_super) {
     __extends(ClassWithInitializer, _super);
     //'this' in required super call
     function ClassWithInitializer() {
-        _super.call(this, this); // Error
+        var _this;
+        _this = _super.call(this, this) || this; // Error
         this.t = 4;
     }
     return ClassWithInitializer;
@@ -97,7 +99,8 @@ genericFunc(undefined); // Should be an error
 var ErrClass3 = (function (_super) {
     __extends(ErrClass3, _super);
     function ErrClass3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return ErrClass3;
 }(this));
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index 827d101c95aed..91e71522e4df8 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -36,14 +36,16 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        _super.call(this, this); // error: "super" has to be called before "this" accessing
+        var _this;
+        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
     }
     return Foo;
 }(Base));
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        _super.call(this, this); // error
+        var _this;
+        _this = _super.call(this, this) || this; // error
         this.p = 0;
     }
     return Foo2;
@@ -51,7 +53,8 @@ var Foo2 = (function (_super) {
 var Foo3 = (function (_super) {
     __extends(Foo3, _super);
     function Foo3(p) {
-        _super.call(this, this); // error
+        var _this;
+        _this = _super.call(this, this) || this; // error
         this.p = p;
     }
     return Foo3;
diff --git a/tests/baselines/reference/thisInSuperCall1.js b/tests/baselines/reference/thisInSuperCall1.js
index a1cfc196ac634..8e68c47eb2717 100644
--- a/tests/baselines/reference/thisInSuperCall1.js
+++ b/tests/baselines/reference/thisInSuperCall1.js
@@ -24,7 +24,8 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x) {
-        _super.call(this, this);
+        var _this;
+        _this = _super.call(this, this) || this;
         this.x = x;
     }
     return Foo;
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index fdffdd27d6d4b..6771f15c99b5c 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -33,14 +33,16 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        _super.call(this, this); // error: "super" has to be called before "this" accessing
+        var _this;
+        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
     }
     return Foo;
 }(Base));
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        _super.call(this, this); // error
+        var _this;
+        _this = _super.call(this, this) || this; // error
         this.x = 0;
     }
     return Foo2;
diff --git a/tests/baselines/reference/thisInSuperCall3.js b/tests/baselines/reference/thisInSuperCall3.js
index 09ad6b705a942..4b6c1747d17df 100644
--- a/tests/baselines/reference/thisInSuperCall3.js
+++ b/tests/baselines/reference/thisInSuperCall3.js
@@ -26,7 +26,8 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        _super.call(this, this);
+        var _this;
+        _this = _super.call(this, this) || this;
         this.x = 0;
     }
     return Foo;
diff --git a/tests/baselines/reference/thisTypeInFunctions.js b/tests/baselines/reference/thisTypeInFunctions.js
index cfe1706ae99db..6eaaed5c497ec 100644
--- a/tests/baselines/reference/thisTypeInFunctions.js
+++ b/tests/baselines/reference/thisTypeInFunctions.js
@@ -227,7 +227,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D;
 }(C));
@@ -336,7 +337,8 @@ var Base1 = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base1));
@@ -350,7 +352,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/thisTypeInFunctionsNegative.js b/tests/baselines/reference/thisTypeInFunctionsNegative.js
index 4b40ca2e1e78f..08e12f49dca76 100644
--- a/tests/baselines/reference/thisTypeInFunctionsNegative.js
+++ b/tests/baselines/reference/thisTypeInFunctionsNegative.js
@@ -296,7 +296,8 @@ var Base1 = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base1));
@@ -310,7 +311,8 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/tsxDynamicTagName5.js b/tests/baselines/reference/tsxDynamicTagName5.js
index a8d154998e16a..9a64ef6cee6c1 100644
--- a/tests/baselines/reference/tsxDynamicTagName5.js
+++ b/tests/baselines/reference/tsxDynamicTagName5.js
@@ -30,7 +30,8 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this._tagName = 'div';
     }
     Text.prototype.render = function () {
diff --git a/tests/baselines/reference/tsxDynamicTagName7.js b/tests/baselines/reference/tsxDynamicTagName7.js
index dbe171f968276..30500b37ce5c0 100644
--- a/tests/baselines/reference/tsxDynamicTagName7.js
+++ b/tests/baselines/reference/tsxDynamicTagName7.js
@@ -30,7 +30,8 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this._tagName = 'div';
     }
     Text.prototype.render = function () {
diff --git a/tests/baselines/reference/tsxDynamicTagName8.js b/tests/baselines/reference/tsxDynamicTagName8.js
index e6f63b6a9bf00..a6cf3bb45b888 100644
--- a/tests/baselines/reference/tsxDynamicTagName8.js
+++ b/tests/baselines/reference/tsxDynamicTagName8.js
@@ -30,7 +30,8 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this._tagName = 'div';
     }
     Text.prototype.render = function () {
diff --git a/tests/baselines/reference/tsxDynamicTagName9.js b/tests/baselines/reference/tsxDynamicTagName9.js
index 589cc7cd226de..aa63e614d1547 100644
--- a/tests/baselines/reference/tsxDynamicTagName9.js
+++ b/tests/baselines/reference/tsxDynamicTagName9.js
@@ -30,7 +30,8 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this._tagName = 'div';
     }
     Text.prototype.render = function () {
diff --git a/tests/baselines/reference/tsxExternalModuleEmit1.js b/tests/baselines/reference/tsxExternalModuleEmit1.js
index 0d4e58d7008e0..0f6b8716ed012 100644
--- a/tests/baselines/reference/tsxExternalModuleEmit1.js
+++ b/tests/baselines/reference/tsxExternalModuleEmit1.js
@@ -42,7 +42,8 @@ var React = require("react");
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Button.prototype.render = function () {
         return <button>Some button</button>;
@@ -63,7 +64,8 @@ var button_1 = require("./button");
 var App = (function (_super) {
     __extends(App, _super);
     function App() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     App.prototype.render = function () {
         return <button_1.Button />;
diff --git a/tests/baselines/reference/tsxStatelessFunctionComponents2.js b/tests/baselines/reference/tsxStatelessFunctionComponents2.js
index b93832567d567..f7ac96cff1f8c 100644
--- a/tests/baselines/reference/tsxStatelessFunctionComponents2.js
+++ b/tests/baselines/reference/tsxStatelessFunctionComponents2.js
@@ -52,7 +52,8 @@ function Greet(x) {
 var BigGreeter = (function (_super) {
     __extends(BigGreeter, _super);
     function BigGreeter() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     BigGreeter.prototype.render = function () {
         return <div></div>;
diff --git a/tests/baselines/reference/tsxUnionTypeComponent1.js b/tests/baselines/reference/tsxUnionTypeComponent1.js
index 444542068be3e..56a6896f05277 100644
--- a/tests/baselines/reference/tsxUnionTypeComponent1.js
+++ b/tests/baselines/reference/tsxUnionTypeComponent1.js
@@ -35,7 +35,8 @@ var React = require("react");
 var MyComponent = (function (_super) {
     __extends(MyComponent, _super);
     function MyComponent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MyComponent.prototype.render = function () {
         var AnyComponent = this.props.AnyComponent;
@@ -49,7 +50,8 @@ React.createElement(MyComponent, { AnyComponent: function () { return React.crea
 var MyButtonComponent = (function (_super) {
     __extends(MyButtonComponent, _super);
     function MyButtonComponent() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return MyButtonComponent;
 }(React.Component));
diff --git a/tests/baselines/reference/typeAssertions.js b/tests/baselines/reference/typeAssertions.js
index 1d33fa927a79b..083cb5e94b391 100644
--- a/tests/baselines/reference/typeAssertions.js
+++ b/tests/baselines/reference/typeAssertions.js
@@ -74,7 +74,8 @@ var SomeBase = (function () {
 var SomeDerived = (function (_super) {
     __extends(SomeDerived, _super);
     function SomeDerived() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return SomeDerived;
 }(SomeBase));
diff --git a/tests/baselines/reference/typeGuardFunction.js b/tests/baselines/reference/typeGuardFunction.js
index fcd6435ca1d6b..45bf0853b138a 100644
--- a/tests/baselines/reference/typeGuardFunction.js
+++ b/tests/baselines/reference/typeGuardFunction.js
@@ -102,7 +102,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionErrors.js b/tests/baselines/reference/typeGuardFunctionErrors.js
index f3ff5ffab4afc..727640ee8af7f 100644
--- a/tests/baselines/reference/typeGuardFunctionErrors.js
+++ b/tests/baselines/reference/typeGuardFunctionErrors.js
@@ -164,7 +164,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionGenerics.js b/tests/baselines/reference/typeGuardFunctionGenerics.js
index 2b5bd5e826598..dad77edf2329b 100644
--- a/tests/baselines/reference/typeGuardFunctionGenerics.js
+++ b/tests/baselines/reference/typeGuardFunctionGenerics.js
@@ -52,7 +52,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionOfFormThis.js b/tests/baselines/reference/typeGuardFunctionOfFormThis.js
index ad85f679e0ab2..eec648976c6cb 100644
--- a/tests/baselines/reference/typeGuardFunctionOfFormThis.js
+++ b/tests/baselines/reference/typeGuardFunctionOfFormThis.js
@@ -161,7 +161,8 @@ var RoyalGuard = (function () {
 var LeadGuard = (function (_super) {
     __extends(LeadGuard, _super);
     function LeadGuard() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     LeadGuard.prototype.lead = function () { };
     ;
@@ -170,7 +171,8 @@ var LeadGuard = (function (_super) {
 var FollowerGuard = (function (_super) {
     __extends(FollowerGuard, _super);
     function FollowerGuard() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     FollowerGuard.prototype.follow = function () { };
     ;
@@ -224,7 +226,8 @@ var ArrowGuard = (function () {
 var ArrowElite = (function (_super) {
     __extends(ArrowElite, _super);
     function ArrowElite() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     ArrowElite.prototype.defend = function () { };
     return ArrowElite;
@@ -232,7 +235,8 @@ var ArrowElite = (function (_super) {
 var ArrowMedic = (function (_super) {
     __extends(ArrowMedic, _super);
     function ArrowMedic() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     ArrowMedic.prototype.heal = function () { };
     return ArrowMedic;
@@ -266,7 +270,8 @@ var MimicGuard = (function () {
 var MimicLeader = (function (_super) {
     __extends(MimicLeader, _super);
     function MimicLeader() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MimicLeader.prototype.lead = function () { };
     return MimicLeader;
@@ -274,7 +279,8 @@ var MimicLeader = (function (_super) {
 var MimicFollower = (function (_super) {
     __extends(MimicFollower, _super);
     function MimicFollower() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MimicFollower.prototype.follow = function () { };
     return MimicFollower;
diff --git a/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js b/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
index 73622bf60cc18..a82d3d2527fe9 100644
--- a/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
+++ b/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
@@ -79,7 +79,8 @@ var RoyalGuard = (function () {
 var LeadGuard = (function (_super) {
     __extends(LeadGuard, _super);
     function LeadGuard() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     LeadGuard.prototype.lead = function () { };
     ;
@@ -88,7 +89,8 @@ var LeadGuard = (function (_super) {
 var FollowerGuard = (function (_super) {
     __extends(FollowerGuard, _super);
     function FollowerGuard() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     FollowerGuard.prototype.follow = function () { };
     ;
diff --git a/tests/baselines/reference/typeGuardOfFormInstanceOf.js b/tests/baselines/reference/typeGuardOfFormInstanceOf.js
index a6881cf3cea15..a94d5fe93e775 100644
--- a/tests/baselines/reference/typeGuardOfFormInstanceOf.js
+++ b/tests/baselines/reference/typeGuardOfFormInstanceOf.js
@@ -91,7 +91,8 @@ var C2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/typeGuardOfFormIsType.js b/tests/baselines/reference/typeGuardOfFormIsType.js
index 3f55b9d41ea9e..2d83a62ad3e6b 100644
--- a/tests/baselines/reference/typeGuardOfFormIsType.js
+++ b/tests/baselines/reference/typeGuardOfFormIsType.js
@@ -56,7 +56,8 @@ var C2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMember.js b/tests/baselines/reference/typeGuardOfFormThisMember.js
index 9d71613ed8ffe..63c79ce4c9192 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMember.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMember.js
@@ -118,7 +118,8 @@ var Test;
     var File = (function (_super) {
         __extends(File, _super);
         function File(path, content) {
-            _super.call(this, path);
+            var _this;
+            _this = _super.call(this, path) || this;
             this.content = content;
         }
         return File;
@@ -127,7 +128,8 @@ var Test;
     var Directory = (function (_super) {
         __extends(Directory, _super);
         function Directory() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Directory;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
index 5991fdd316971..5c28921a6a7a3 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
@@ -68,7 +68,8 @@ var Test;
     var File = (function (_super) {
         __extends(File, _super);
         function File(path, content) {
-            _super.call(this, path);
+            var _this;
+            _this = _super.call(this, path) || this;
             this.content = content;
         }
         return File;
@@ -77,7 +78,8 @@ var Test;
     var Directory = (function (_super) {
         __extends(Directory, _super);
         function Directory() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return Directory;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeMatch2.js b/tests/baselines/reference/typeMatch2.js
index 57ba67752e239..03408c6196b0d 100644
--- a/tests/baselines/reference/typeMatch2.js
+++ b/tests/baselines/reference/typeMatch2.js
@@ -65,7 +65,8 @@ var Animal = (function () {
 var Giraffe = (function (_super) {
     __extends(Giraffe, _super);
     function Giraffe() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Giraffe;
 }(Animal));
diff --git a/tests/baselines/reference/typeOfSuperCall.js b/tests/baselines/reference/typeOfSuperCall.js
index 94215d4ae1bf9..70ace4becb416 100644
--- a/tests/baselines/reference/typeOfSuperCall.js
+++ b/tests/baselines/reference/typeOfSuperCall.js
@@ -22,7 +22,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var x = _super.call(this);
+        var _this;
+        var x = _this = _super.call(this) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/typeParameterAsBaseClass.js b/tests/baselines/reference/typeParameterAsBaseClass.js
index a01b6a0cac2ac..d67259304c3a8 100644
--- a/tests/baselines/reference/typeParameterAsBaseClass.js
+++ b/tests/baselines/reference/typeParameterAsBaseClass.js
@@ -11,7 +11,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(T));
diff --git a/tests/baselines/reference/typeParameterAsBaseType.js b/tests/baselines/reference/typeParameterAsBaseType.js
index 9c3a9bcfcd0c6..24f8789a82d66 100644
--- a/tests/baselines/reference/typeParameterAsBaseType.js
+++ b/tests/baselines/reference/typeParameterAsBaseType.js
@@ -21,14 +21,16 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C;
 }(T));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(U));
diff --git a/tests/baselines/reference/typeParameterExtendingUnion1.js b/tests/baselines/reference/typeParameterExtendingUnion1.js
index 75614f46d2194..55bc51bbdbb3b 100644
--- a/tests/baselines/reference/typeParameterExtendingUnion1.js
+++ b/tests/baselines/reference/typeParameterExtendingUnion1.js
@@ -27,14 +27,16 @@ var Animal = (function () {
 var Cat = (function (_super) {
     __extends(Cat, _super);
     function Cat() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Cat;
 }(Animal));
 var Dog = (function (_super) {
     __extends(Dog, _super);
     function Dog() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Dog;
 }(Animal));
diff --git a/tests/baselines/reference/typeParameterExtendingUnion2.js b/tests/baselines/reference/typeParameterExtendingUnion2.js
index b32c43bc5ec5a..75f62e94c679c 100644
--- a/tests/baselines/reference/typeParameterExtendingUnion2.js
+++ b/tests/baselines/reference/typeParameterExtendingUnion2.js
@@ -27,14 +27,16 @@ var Animal = (function () {
 var Cat = (function (_super) {
     __extends(Cat, _super);
     function Cat() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Cat;
 }(Animal));
 var Dog = (function (_super) {
     __extends(Dog, _super);
     function Dog() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Dog;
 }(Animal));
diff --git a/tests/baselines/reference/typeRelationships.js b/tests/baselines/reference/typeRelationships.js
index 6f8f1ccd4ccc9..43c1f7ee14638 100644
--- a/tests/baselines/reference/typeRelationships.js
+++ b/tests/baselines/reference/typeRelationships.js
@@ -72,7 +72,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this;
+        _this = _super.apply(this, arguments) || this;
         this.self1 = this;
         this.self2 = this.self;
         this.self3 = this.foo();
diff --git a/tests/baselines/reference/typeValueConflict1.js b/tests/baselines/reference/typeValueConflict1.js
index eaca97d31dde0..a1ecef212dae8 100644
--- a/tests/baselines/reference/typeValueConflict1.js
+++ b/tests/baselines/reference/typeValueConflict1.js
@@ -33,7 +33,8 @@ var M2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(M1.A));
diff --git a/tests/baselines/reference/typeValueConflict2.js b/tests/baselines/reference/typeValueConflict2.js
index d89ab0fd357ca..a0cfeda07ecdc 100644
--- a/tests/baselines/reference/typeValueConflict2.js
+++ b/tests/baselines/reference/typeValueConflict2.js
@@ -40,7 +40,8 @@ var M2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(M1.A));
@@ -51,7 +52,8 @@ var M3;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return B;
     }(M1.A));
diff --git a/tests/baselines/reference/typeofClass2.js b/tests/baselines/reference/typeofClass2.js
index a0c30c1b1665f..b3da31103df5a 100644
--- a/tests/baselines/reference/typeofClass2.js
+++ b/tests/baselines/reference/typeofClass2.js
@@ -37,7 +37,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.baz = function (x) { };
     D.prototype.foo = function () { };
diff --git a/tests/baselines/reference/typesWithSpecializedCallSignatures.js b/tests/baselines/reference/typesWithSpecializedCallSignatures.js
index e83fd36ae625d..853cb5eafd7bf 100644
--- a/tests/baselines/reference/typesWithSpecializedCallSignatures.js
+++ b/tests/baselines/reference/typesWithSpecializedCallSignatures.js
@@ -56,14 +56,16 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/typesWithSpecializedConstructSignatures.js b/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
index 63d5e9bb5b2c9..9931459744099 100644
--- a/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
+++ b/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
@@ -54,14 +54,16 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/undeclaredBase.js b/tests/baselines/reference/undeclaredBase.js
index 3dd27a3dbfbdb..64117b1935a3c 100644
--- a/tests/baselines/reference/undeclaredBase.js
+++ b/tests/baselines/reference/undeclaredBase.js
@@ -14,7 +14,8 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return C;
     }(M.I));
diff --git a/tests/baselines/reference/undefinedIsSubtypeOfEverything.js b/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
index 513464daa85b1..451aec91affe6 100644
--- a/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
+++ b/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
@@ -136,105 +136,120 @@ var Base = (function () {
 var D0 = (function (_super) {
     __extends(D0, _super);
     function D0() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D0;
 }(Base));
 var DA = (function (_super) {
     __extends(DA, _super);
     function DA() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return DA;
 }(Base));
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1;
 }(Base));
 var D1A = (function (_super) {
     __extends(D1A, _super);
     function D1A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D1A;
 }(Base));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2;
 }(Base));
 var D2A = (function (_super) {
     __extends(D2A, _super);
     function D2A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D2A;
 }(Base));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D3;
 }(Base));
 var D3A = (function (_super) {
     __extends(D3A, _super);
     function D3A() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D3A;
 }(Base));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D4;
 }(Base));
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D5;
 }(Base));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D6;
 }(Base));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D7;
 }(Base));
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D8;
 }(Base));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D9;
 }(Base));
 var D10 = (function (_super) {
     __extends(D10, _super);
     function D10() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D10;
 }(Base));
@@ -245,7 +260,8 @@ var E;
 var D11 = (function (_super) {
     __extends(D11, _super);
     function D11() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D11;
 }(Base));
@@ -257,7 +273,8 @@ var f;
 var D12 = (function (_super) {
     __extends(D12, _super);
     function D12() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D12;
 }(Base));
@@ -273,21 +290,24 @@ var c;
 var D13 = (function (_super) {
     __extends(D13, _super);
     function D13() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D13;
 }(Base));
 var D14 = (function (_super) {
     __extends(D14, _super);
     function D14() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D14;
 }(Base));
 var D15 = (function (_super) {
     __extends(D15, _super);
     function D15() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D15;
 }(Base));
@@ -297,14 +317,16 @@ var D15 = (function (_super) {
 var D16 = (function (_super) {
     __extends(D16, _super);
     function D16() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D16;
 }(Base));
 var D17 = (function (_super) {
     __extends(D17, _super);
     function D17() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return D17;
 }(Base));
diff --git a/tests/baselines/reference/underscoreMapFirst.js b/tests/baselines/reference/underscoreMapFirst.js
index a615faea805e9..61f1bf2c9f9b6 100644
--- a/tests/baselines/reference/underscoreMapFirst.js
+++ b/tests/baselines/reference/underscoreMapFirst.js
@@ -57,7 +57,8 @@ var __extends = (this && this.__extends) || function (d, b) {
 var MyView = (function (_super) {
     __extends(MyView, _super);
     function MyView() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     MyView.prototype.getDataSeries = function () {
         var data = this.model.get("data");
diff --git a/tests/baselines/reference/unionTypeEquivalence.js b/tests/baselines/reference/unionTypeEquivalence.js
index 1ff47f68e5f1b..b0be82122de83 100644
--- a/tests/baselines/reference/unionTypeEquivalence.js
+++ b/tests/baselines/reference/unionTypeEquivalence.js
@@ -34,7 +34,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo = function () { };
     return D;
diff --git a/tests/baselines/reference/unionTypeFromArrayLiteral.js b/tests/baselines/reference/unionTypeFromArrayLiteral.js
index 95dd9d398536b..72cf61f72fd88 100644
--- a/tests/baselines/reference/unionTypeFromArrayLiteral.js
+++ b/tests/baselines/reference/unionTypeFromArrayLiteral.js
@@ -54,7 +54,8 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo3 = function () { };
     return E;
@@ -62,7 +63,8 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     F.prototype.foo4 = function () { };
     return F;
diff --git a/tests/baselines/reference/unionTypesAssignability.js b/tests/baselines/reference/unionTypesAssignability.js
index c710560800406..fafc4ec85fa99 100644
--- a/tests/baselines/reference/unionTypesAssignability.js
+++ b/tests/baselines/reference/unionTypesAssignability.js
@@ -88,7 +88,8 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     D.prototype.foo1 = function () { };
     return D;
@@ -96,7 +97,8 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     E.prototype.foo2 = function () { };
     return E;
diff --git a/tests/baselines/reference/unknownSymbols1.js b/tests/baselines/reference/unknownSymbols1.js
index 03ed4990c29ed..46ee4ed02d5cb 100644
--- a/tests/baselines/reference/unknownSymbols1.js
+++ b/tests/baselines/reference/unknownSymbols1.js
@@ -63,7 +63,8 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        _super.call(this, asdf);
+        var _this;
+        _this = _super.call(this, asdf) || this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/unspecializedConstraints.js b/tests/baselines/reference/unspecializedConstraints.js
index 7b3938c7099d1..b2ea2cac9ebcf 100644
--- a/tests/baselines/reference/unspecializedConstraints.js
+++ b/tests/baselines/reference/unspecializedConstraints.js
@@ -169,7 +169,8 @@ var ts;
     var Type = (function (_super) {
         __extends(Type, _super);
         function Type() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         Type.prototype.equals = function (that) {
             if (this === that)
@@ -233,7 +234,8 @@ var ts;
     var Property = (function (_super) {
         __extends(Property, _super);
         function Property(name, type, flags) {
-            _super.call(this);
+            var _this;
+            _this = _super.call(this) || this;
             this.name = name;
             this.type = type;
             this.flags = flags;
@@ -253,7 +255,8 @@ var ts;
     var Signature = (function (_super) {
         __extends(Signature, _super);
         function Signature(typeParameters, parameters, returnType) {
-            _super.call(this);
+            var _this;
+            _this = _super.call(this) || this;
             this.typeParameters = typeParameters;
             this.parameters = parameters;
             this.returnType = returnType;
@@ -273,7 +276,8 @@ var ts;
     var Parameter = (function (_super) {
         __extends(Parameter, _super);
         function Parameter(name, type, flags) {
-            _super.call(this);
+            var _this;
+            _this = _super.call(this) || this;
             this.name = name;
             this.type = type;
             this.flags = flags;
diff --git a/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js b/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
index e991db69367f3..324dc784b67f4 100644
--- a/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
+++ b/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
@@ -70,7 +70,8 @@ var r4 = c2(); // should be an error
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     return C2;
 }(Function)); // error
diff --git a/tests/baselines/reference/unusedClassesinNamespace4.js b/tests/baselines/reference/unusedClassesinNamespace4.js
index 65198c1c1aa7e..3c1dd16874e5e 100644
--- a/tests/baselines/reference/unusedClassesinNamespace4.js
+++ b/tests/baselines/reference/unusedClassesinNamespace4.js
@@ -36,7 +36,8 @@ var Validation;
     var c3 = (function (_super) {
         __extends(c3, _super);
         function c3() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return c3;
     }(c1));
diff --git a/tests/baselines/reference/unusedIdentifiersConsolidated1.js b/tests/baselines/reference/unusedIdentifiersConsolidated1.js
index 521f17bf5ef7e..fd7d859ac3710 100644
--- a/tests/baselines/reference/unusedIdentifiersConsolidated1.js
+++ b/tests/baselines/reference/unusedIdentifiersConsolidated1.js
@@ -168,7 +168,8 @@ var Greeter;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            _super.apply(this, arguments);
+            var _this = _super.apply(this, arguments) || this;
+            return _this;
         }
         return class2;
     }(class1));
diff --git a/tests/baselines/reference/validUseOfThisInSuper.js b/tests/baselines/reference/validUseOfThisInSuper.js
index 027ba254ae019..96802932f12fa 100644
--- a/tests/baselines/reference/validUseOfThisInSuper.js
+++ b/tests/baselines/reference/validUseOfThisInSuper.js
@@ -24,8 +24,8 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = this;
-        _super.call(this, (function () { return _this; })()); // ok since this is not the case: The constructor declares parameter properties or the containing class declares instance member variables with initializers.
+        var _this;
+        _this = _super.call(this, (function () { return _this; })()) || this; // ok since this is not the case: The constructor declares parameter properties or the containing class declares instance member variables with initializers.
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/varArgsOnConstructorTypes.js b/tests/baselines/reference/varArgsOnConstructorTypes.js
index db8f566702aa3..e892cc28a3c8f 100644
--- a/tests/baselines/reference/varArgsOnConstructorTypes.js
+++ b/tests/baselines/reference/varArgsOnConstructorTypes.js
@@ -41,7 +41,8 @@ define(["require", "exports"], function (require, exports) {
     var B = (function (_super) {
         __extends(B, _super);
         function B(element, url) {
-            _super.call(this, element);
+            var _this;
+            _this = _super.call(this, element) || this;
             this.p1 = element;
             this.p2 = url;
         }

From d778e78f1ef118befdd2ae4866864bfd1465f389 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 00:08:26 -0700
Subject: [PATCH 03/39] Transform other instances of 'this' to '_this' when in
 the constructor of a derived class.

---
 src/compiler/transformers/es6.ts | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index aab894dc4ff2e..5dd2b154c01f5 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -722,7 +722,10 @@ namespace ts {
         function addConstructor(statements: Statement[], node: ClassExpression | ClassDeclaration, extendsClauseElement: ExpressionWithTypeArguments): void {
             const constructor = getFirstConstructorWithBody(node);
             const hasSynthesizedSuper = hasSynthesizedDefaultSuperCall(constructor, extendsClauseElement !== undefined);
-            statements.push(
+            const savedUseCapturedThis = useCapturedThis;
+            useCapturedThis = true;
+
+            const constructorFunction =
                 createFunctionDeclaration(
                     /*decorators*/ undefined,
                     /*modifiers*/ undefined,
@@ -733,8 +736,13 @@ namespace ts {
                     /*type*/ undefined,
                     transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper),
                     /*location*/ constructor || node
-                )
-            );
+                );
+
+            if (extendsClauseElement) {
+                setNodeEmitFlags(constructorFunction, NodeEmitFlags.CapturesThis);
+            }
+            useCapturedThis = savedUseCapturedThis;
+            statements.push(constructorFunction);
         }
 
         /**
@@ -769,6 +777,7 @@ namespace ts {
         function transformConstructorBody(constructor: ConstructorDeclaration, node: ClassDeclaration | ClassExpression, extendsClauseElement: ExpressionWithTypeArguments, hasSynthesizedSuper: boolean) {
             const statements: Statement[] = [];
             startLexicalEnvironment();
+
             if (constructor) {
                 declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement);
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
@@ -830,12 +839,14 @@ namespace ts {
             // If this is the case, or if the class has an `extends` clause but no
             // constructor, we emit a synthesized call to `_super`.
             if (constructor ? hasSynthesizedSuper : extendsClauseElement) {
+                const actualThis = createThis();
+                setNodeEmitFlags(actualThis, NodeEmitFlags.NoSubstitution);
                 const superCall = createFunctionApply(
                     createIdentifier("_super"),
-                    createThis(),
+                    actualThis,
                     createIdentifier("arguments"),
                 );
-                const superReturnValueOrThis = createLogicalOr(superCall, createThis());
+                const superReturnValueOrThis = createLogicalOr(superCall, actualThis);
 
                 statements.push(
                     createVariableStatement(
@@ -2504,6 +2515,9 @@ namespace ts {
             // because we contain a SpreadElementExpression.
 
             const { target, thisArg } = createCallBinding(node.expression, hoistVariableDeclaration);
+            if (node.expression.kind === SyntaxKind.SuperKeyword) {
+                setNodeEmitFlags(thisArg, NodeEmitFlags.NoSubstitution);
+            }
             let resultingCall: CallExpression | BinaryExpression;
             if (node.transformFlags & TransformFlags.ContainsSpreadElementExpression) {
                 // [source]
@@ -2546,11 +2560,13 @@ namespace ts {
             }
 
             if (node.expression.kind === SyntaxKind.SuperKeyword) {
+                const actualThis = createThis();
+                setNodeEmitFlags(actualThis, NodeEmitFlags.NoSubstitution);
                 return createAssignment(
                     createIdentifier("_this"),
                     createLogicalOr(
                         resultingCall,
-                        createThis()
+                        actualThis
                     )
                 );
             }

From c21cc24c44689875f1a0104a366ac65ff5975361 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 00:12:03 -0700
Subject: [PATCH 04/39] Accepted baselines for all tests apart from one with
 source map changes.

---
 tests/baselines/reference/abstractProperty.js |   4 +-
 .../reference/abstractPropertyNegative.js     |   6 +-
 .../accessOverriddenBaseClassMember1.js       |   2 +-
 ...aliasUsageInTypeArgumentOfExtendsClause.js |   2 +-
 tests/baselines/reference/autolift4.js        |   2 +-
 tests/baselines/reference/baseCheck.js        |  12 +-
 tests/baselines/reference/bases.js            |   2 +-
 .../reference/bestCommonTypeOfTuple2.js       |   2 +-
 .../checkSuperCallBeforeThisAccessing1.js     |   6 +-
 .../checkSuperCallBeforeThisAccessing2.js     |   6 +-
 .../checkSuperCallBeforeThisAccessing3.js     |   4 +-
 .../checkSuperCallBeforeThisAccessing4.js     |   4 +-
 .../checkSuperCallBeforeThisAccessing5.js     |   2 +-
 .../checkSuperCallBeforeThisAccessing8.js     |   2 +-
 .../classConstructorAccessibility2.js         |   6 +-
 ...classConstructorParametersAccessibility.js |   2 +-
 ...lassConstructorParametersAccessibility2.js |   2 +-
 ...lassConstructorParametersAccessibility3.js |   4 +-
 tests/baselines/reference/classExpression3.js |   4 +-
 .../reference/classExtendingClassLikeType.js  |  12 +-
 .../reference/classSideInheritance3.js        |   2 +-
 tests/baselines/reference/classUpdateTests.js |  12 +-
 ...ollisionSuperAndLocalFunctionInProperty.js |   2 +-
 .../collisionSuperAndLocalVarInProperty.js    |   4 +-
 .../reference/collisionSuperAndParameter.js   |   2 +-
 ...perAndPropertyNameAsConstuctorParameter.js |   4 +-
 .../reference/computedPropertyNames30_ES5.js  |   2 +-
 tests/baselines/reference/constructorArgs.js  |   2 +-
 .../reference/declFileGenericType2.js         |   2 +-
 ...derivedClassConstructorWithoutSuperCall.js |   2 +-
 .../derivedClassParameterProperties.js        |  34 +-
 ...dClassSuperCallsInNonConstructorMembers.js |   2 +-
 .../derivedClassSuperCallsWithThisArg.js      |  10 +-
 .../derivedClassWithoutExplicitConstructor.js |   8 +-
 ...derivedClassWithoutExplicitConstructor2.js |   8 +-
 ...derivedClassWithoutExplicitConstructor3.js |  16 +-
 ...BeforeEmitParameterPropertyDeclaration1.js |   2 +-
 ...SuperCallBeforeEmitPropertyDeclaration1.js |   2 +-
 ...arationAndParameterPropertyDeclaration1.js |   4 +-
 tests/baselines/reference/errorSuperCalls.js  |   4 +-
 tests/baselines/reference/es6ClassTest.js     |  12 +-
 ...ericRecursiveImplicitConstructorErrors3.js |   2 +-
 .../illegalSuperCallsInConstructor.js         |   4 +-
 .../interfaceExtendsClassWithPrivate2.js      |   6 +-
 ...objectCreationOfElementAccessExpression.js |  16 +-
 tests/baselines/reference/optionalMethods.js  |   2 +-
 .../reference/optionalParameterProperty.js    |   2 +-
 .../overloadOnConstConstraintChecks4.js       |   2 +-
 tests/baselines/reference/parserAstSpans1.js  |   4 +-
 .../baselines/reference/parserRealSource10.js |  24 +-
 .../baselines/reference/parserRealSource11.js | 308 +++++++++---------
 tests/baselines/reference/parserharness.js    |   8 +-
 .../privateInstanceMemberAccessibility.js     |   4 +-
 .../privateStaticMemberAccessibility.js       |   2 +-
 .../readonlyConstructorAssignment.js          |  10 +-
 tests/baselines/reference/scopeTests.js       |   4 +-
 .../baselines/reference/staticInheritance.js  |   4 +-
 tests/baselines/reference/staticPropSuper.js  |   6 +-
 .../reference/strictModeInConstructor.js      |   6 +-
 tests/baselines/reference/superAccess2.js     |   4 +-
 .../reference/superCallArgsMustMatch.js       |   2 +-
 .../superCallBeforeThisAccessing1.js          |   2 +-
 .../superCallBeforeThisAccessing3.js          |   2 +-
 .../superCallBeforeThisAccessing4.js          |   4 +-
 .../superCallBeforeThisAccessing5.js          |   2 +-
 .../superCallBeforeThisAccessing6.js          |   2 +-
 .../superCallBeforeThisAccessing7.js          |   2 +-
 .../superCallBeforeThisAccessing8.js          |   2 +-
 .../reference/superCallInNonStaticMethod.js   |   6 +-
 .../reference/superCallOutsideConstructor.js  |   4 +-
 .../superCallParameterContextualTyping3.js    |   2 +-
 tests/baselines/reference/superCalls.js       |   2 +-
 tests/baselines/reference/superErrors.js      |   2 +-
 .../reference/superInConstructorParam1.js     |   2 +-
 tests/baselines/reference/superInLambdas.js   |  10 +-
 .../reference/superPropertyAccess1.js         |   2 +-
 .../reference/superPropertyAccess2.js         |   2 +-
 .../reference/superPropertyAccessNoError.js   |   2 +-
 .../reference/superPropertyAccess_ES5.js      |   2 +-
 .../reference/superWithTypeArgument.js        |   2 +-
 .../reference/superWithTypeArgument2.js       |   2 +-
 .../reference/superWithTypeArgument3.js       |   2 +-
 .../reference/thisInInvalidContexts.js        |   6 +-
 .../thisInInvalidContextsExternalModule.js    |   6 +-
 tests/baselines/reference/thisInSuperCall.js  |  10 +-
 tests/baselines/reference/thisInSuperCall1.js |   4 +-
 tests/baselines/reference/thisInSuperCall2.js |   6 +-
 tests/baselines/reference/thisInSuperCall3.js |   4 +-
 .../baselines/reference/tsxDynamicTagName5.js |   2 +-
 .../baselines/reference/tsxDynamicTagName7.js |   2 +-
 .../baselines/reference/tsxDynamicTagName8.js |   2 +-
 .../baselines/reference/tsxDynamicTagName9.js |   2 +-
 .../reference/typeGuardOfFormThisMember.js    |   2 +-
 .../typeGuardOfFormThisMemberErrors.js        |   2 +-
 .../baselines/reference/typeRelationships.js  |   8 +-
 .../reference/unspecializedConstraints.js     |  18 +-
 .../reference/varArgsOnConstructorTypes.js    |   4 +-
 97 files changed, 389 insertions(+), 389 deletions(-)

diff --git a/tests/baselines/reference/abstractProperty.js b/tests/baselines/reference/abstractProperty.js
index 803df9f1d56cb..d9bfd5eb05f6f 100644
--- a/tests/baselines/reference/abstractProperty.js
+++ b/tests/baselines/reference/abstractProperty.js
@@ -37,8 +37,8 @@ var C = (function (_super) {
     function C() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.raw = "edge";
-        this.ro = "readonly please";
+        _this.raw = "edge";
+        _this.ro = "readonly please";
     }
     Object.defineProperty(C.prototype, "prop", {
         get: function () { return "foo"; },
diff --git a/tests/baselines/reference/abstractPropertyNegative.js b/tests/baselines/reference/abstractPropertyNegative.js
index d6e1ce1813fe9..e94d9492fdb81 100644
--- a/tests/baselines/reference/abstractPropertyNegative.js
+++ b/tests/baselines/reference/abstractPropertyNegative.js
@@ -59,7 +59,7 @@ var C = (function (_super) {
     function C() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.ro = "readonly please";
+        _this.ro = "readonly please";
     }
     Object.defineProperty(C.prototype, "concreteWithNoBody", {
         get: function () { },
@@ -80,7 +80,7 @@ var WrongTypePropertyImpl = (function (_super) {
     function WrongTypePropertyImpl() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.num = "nope, wrong";
+        _this.num = "nope, wrong";
     }
     return WrongTypePropertyImpl;
 }(WrongTypeProperty));
@@ -107,7 +107,7 @@ var WrongTypeAccessorImpl2 = (function (_super) {
     function WrongTypeAccessorImpl2() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.num = "nope, wrong";
+        _this.num = "nope, wrong";
     }
     return WrongTypeAccessorImpl2;
 }(WrongTypeAccessor));
diff --git a/tests/baselines/reference/accessOverriddenBaseClassMember1.js b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
index d60f260a163db..b4c269b1e3bae 100644
--- a/tests/baselines/reference/accessOverriddenBaseClassMember1.js
+++ b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
@@ -36,7 +36,7 @@ var ColoredPoint = (function (_super) {
     function ColoredPoint(x, y, color) {
         var _this;
         _this = _super.call(this, x, y) || this;
-        this.color = color;
+        _this.color = color;
     }
     ColoredPoint.prototype.toString = function () {
         return _super.prototype.toString.call(this) + " color=" + this.color;
diff --git a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
index 1893f6586ee03..462390d28f7fb 100644
--- a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
+++ b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
@@ -67,7 +67,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = moduleA;
+        _this.x = moduleA;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/autolift4.js b/tests/baselines/reference/autolift4.js
index 85dd3725639a3..b6afd28d429aa 100644
--- a/tests/baselines/reference/autolift4.js
+++ b/tests/baselines/reference/autolift4.js
@@ -45,7 +45,7 @@ var Point3D = (function (_super) {
     function Point3D(x, y, z, m) {
         var _this;
         _this = _super.call(this, x, y) || this;
-        this.z = z;
+        _this.z = z;
     }
     Point3D.prototype.getDist = function () {
         return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.m);
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index 800742ff63b2b..c3a2731b45d92 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -63,8 +63,8 @@ var D = (function (_super) {
     __extends(D, _super);
     function D(z) {
         var _this;
-        _this = _super.call(this, this.z) || this;
-        this.z = z;
+        _this = _super.call(this, _this.z) || this;
+        _this.z = z;
     }
     return D;
 }(C)); // too few params
@@ -72,8 +72,8 @@ var E = (function (_super) {
     __extends(E, _super);
     function E(z) {
         var _this;
-        _this = _super.call(this, 0, this.z) || this;
-        this.z = z;
+        _this = _super.call(this, 0, _this.z) || this;
+        _this.z = z;
     }
     return E;
 }(C));
@@ -81,8 +81,8 @@ var F = (function (_super) {
     __extends(F, _super);
     function F(z) {
         var _this;
-        _this = _super.call(this, "hello", this.z) || this;
-        this.z = z;
+        _this = _super.call(this, "hello", _this.z) || this;
+        _this.z = z;
     }
     return F;
 }(C)); // first param type
diff --git a/tests/baselines/reference/bases.js b/tests/baselines/reference/bases.js
index fcf1d7fe124ac..ff6a3262d4565 100644
--- a/tests/baselines/reference/bases.js
+++ b/tests/baselines/reference/bases.js
@@ -37,7 +37,7 @@ var C = (function (_super) {
     __extends(C, _super);
     function C() {
         var _this;
-        this.x;
+        _this.x;
         any;
     }
     return C;
diff --git a/tests/baselines/reference/bestCommonTypeOfTuple2.js b/tests/baselines/reference/bestCommonTypeOfTuple2.js
index 36232ad04b1e8..34deb346cbd5c 100644
--- a/tests/baselines/reference/bestCommonTypeOfTuple2.js
+++ b/tests/baselines/reference/bestCommonTypeOfTuple2.js
@@ -62,7 +62,7 @@ var D1 = (function (_super) {
     function D1() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.i = "bar";
+        _this.i = "bar";
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
index dc70f3e8d0816..35e00c36621e6 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
@@ -26,9 +26,9 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.call(this) || this;
-        this;
-        this.x = 10;
-        var that = this;
+        _this;
+        _this.x = 10;
+        var that = _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
index f1fcdb48daef8..b49c1aab7744a 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
@@ -25,10 +25,10 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
         var _this;
-        this.x = 100;
+        _this.x = 100;
         _this = _super.call(this) || this;
-        this.x = 10;
-        var that = this;
+        _this.x = 10;
+        var that = _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
index d2ede7d04b15f..70600bb03a953 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
@@ -37,8 +37,8 @@ var Derived = (function (_super) {
             return innver;
         }());
         _this = _super.call(this) || this;
-        this.x = 10;
-        var that = this;
+        _this.x = 10;
+        var that = _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
index c6eddf4ef4898..95e0062b0872d 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
@@ -45,8 +45,8 @@ var Derived = (function (_super) {
         })();
         _this = _super.call(this) || this;
         _this = _super.call(this) || this;
-        this.x = 10;
-        var that = this;
+        _this.x = 10;
+        var that = _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index e58d55fd274f7..1c77b2e7c78e3 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -26,7 +26,7 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
         var _this;
-        _this = _super.call(this, this.x) || this;
+        _this = _super.call(this, _this.x) || this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
index cf0da205d7189..a280c0d6ca6f5 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
@@ -29,7 +29,7 @@ var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
         var _this;
-        var that = this;
+        var that = _this;
         _this = _super.call(this) || this;
     }
     return Super;
diff --git a/tests/baselines/reference/classConstructorAccessibility2.js b/tests/baselines/reference/classConstructorAccessibility2.js
index 95206681372ee..9d1ebdd9d9aef 100644
--- a/tests/baselines/reference/classConstructorAccessibility2.js
+++ b/tests/baselines/reference/classConstructorAccessibility2.js
@@ -79,7 +79,7 @@ var DerivedA = (function (_super) {
     function DerivedA(x) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.x = x;
+        _this.x = x;
     }
     DerivedA.prototype.createInstance = function () { new DerivedA(5); };
     DerivedA.prototype.createBaseInstance = function () { new BaseA(6); };
@@ -91,7 +91,7 @@ var DerivedB = (function (_super) {
     function DerivedB(x) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.x = x;
+        _this.x = x;
     }
     DerivedB.prototype.createInstance = function () { new DerivedB(7); };
     DerivedB.prototype.createBaseInstance = function () { new BaseB(8); }; // ok
@@ -103,7 +103,7 @@ var DerivedC = (function (_super) {
     function DerivedC(x) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.x = x;
+        _this.x = x;
     }
     DerivedC.prototype.createInstance = function () { new DerivedC(9); };
     DerivedC.prototype.createBaseInstance = function () { new BaseC(10); }; // error
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility.js b/tests/baselines/reference/classConstructorParametersAccessibility.js
index 1f282ba71322d..066c724b60f79 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility.js
@@ -61,7 +61,7 @@ var Derived = (function (_super) {
     function Derived(p) {
         var _this;
         _this = _super.call(this, p) || this;
-        this.p; // OK
+        _this.p; // OK
     }
     return Derived;
 }(C3));
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility2.js b/tests/baselines/reference/classConstructorParametersAccessibility2.js
index 81ad696ddc86c..b80504351712d 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility2.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility2.js
@@ -61,7 +61,7 @@ var Derived = (function (_super) {
     function Derived(p) {
         var _this;
         _this = _super.call(this, p) || this;
-        this.p; // OK
+        _this.p; // OK
     }
     return Derived;
 }(C3));
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility3.js b/tests/baselines/reference/classConstructorParametersAccessibility3.js
index 95509867cc574..9e0c0264fd954 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility3.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility3.js
@@ -30,8 +30,8 @@ var Derived = (function (_super) {
     function Derived(p) {
         var _this;
         _this = _super.call(this, p) || this;
-        this.p = p;
-        this.p; // OK
+        _this.p = p;
+        _this.p; // OK
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/classExpression3.js b/tests/baselines/reference/classExpression3.js
index b91d541361129..e0ba9c349e74d 100644
--- a/tests/baselines/reference/classExpression3.js
+++ b/tests/baselines/reference/classExpression3.js
@@ -17,7 +17,7 @@ var C = (function (_super) {
     function class_1() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.c = 3;
+        _this.c = 3;
     }
     return class_1;
 }((function (_super) {
@@ -25,7 +25,7 @@ var C = (function (_super) {
     function class_2() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.b = 2;
+        _this.b = 2;
     }
     return class_2;
 }((function () {
diff --git a/tests/baselines/reference/classExtendingClassLikeType.js b/tests/baselines/reference/classExtendingClassLikeType.js
index 031253a19ade2..2d91befc17240 100644
--- a/tests/baselines/reference/classExtendingClassLikeType.js
+++ b/tests/baselines/reference/classExtendingClassLikeType.js
@@ -78,8 +78,8 @@ var D1 = (function (_super) {
     function D1() {
         var _this;
         _this = _super.call(this, "abc", "def") || this;
-        this.x = "x";
-        this.y = "y";
+        _this.x = "x";
+        _this.y = "y";
     }
     return D1;
 }(getBase()));
@@ -89,8 +89,8 @@ var D2 = (function (_super) {
         var _this;
         _this = _super.call(this, 10) || this;
         _this = _super.call(this, 10, 20) || this;
-        this.x = 1;
-        this.y = 2;
+        _this.x = 1;
+        _this.y = 2;
     }
     return D2;
 }(getBase()));
@@ -99,8 +99,8 @@ var D3 = (function (_super) {
     function D3() {
         var _this;
         _this = _super.call(this, "abc", 42) || this;
-        this.x = "x";
-        this.y = 2;
+        _this.x = "x";
+        _this.y = 2;
     }
     return D3;
 }(getBase()));
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index d9e4c3f148208..4751e0e8d6e56 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -35,7 +35,7 @@ var B = (function (_super) {
     function B(x, data) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.data = data;
+        _this.data = data;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index 7b13fa1bf4c48..d334e1c7f66ef 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -159,7 +159,7 @@ var E = (function (_super) {
     function E() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.p1 = 0;
+        _this.p1 = 0;
     }
     return E;
 }(D));
@@ -175,7 +175,7 @@ var G = (function (_super) {
     function G() {
         var _this;
         _this = _super.call(this) || this;
-        this.p1 = 0;
+        _this.p1 = 0;
     } // NO ERROR
     return G;
 }(D));
@@ -198,7 +198,7 @@ var J = (function (_super) {
     function J(p1) {
         var _this;
         _this = _super.call(this) || this; // NO ERROR
-        this.p1 = p1;
+        _this.p1 = p1;
     }
     return J;
 }(G));
@@ -206,7 +206,7 @@ var K = (function (_super) {
     __extends(K, _super);
     function K(p1) {
         var _this;
-        this.p1 = p1;
+        _this.p1 = p1;
         var i = 0;
         _this = _super.call(this) || this;
     }
@@ -217,7 +217,7 @@ var L = (function (_super) {
     function L(p1) {
         var _this;
         _this = _super.call(this) || this; // NO ERROR
-        this.p1 = p1;
+        _this.p1 = p1;
     }
     return L;
 }(G));
@@ -225,7 +225,7 @@ var M = (function (_super) {
     __extends(M, _super);
     function M(p1) {
         var _this;
-        this.p1 = p1;
+        _this.p1 = p1;
         var i = 0;
         _this = _super.call(this) || this;
     }
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
index da4175fe5c711..e3d834dd1d415 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
@@ -42,7 +42,7 @@ var b = (function (_super) {
     function b() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.prop2 = {
+        _this.prop2 = {
             doStuff: function () {
                 function _super() {
                 }
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
index 598bb5b6e8568..e7cb0e613cc4f 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
@@ -40,12 +40,12 @@ var b = (function (_super) {
     function b() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.prop2 = {
+        _this.prop2 = {
             doStuff: function () {
                 var _super = 10; // Should be error 
             }
         };
-        this._super = 10; // No error
+        _this._super = 10; // No error
     }
     return b;
 }(Foo));
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index 9909ca512ce90..a60889888d663 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -96,7 +96,7 @@ var Foo2 = (function (_super) {
     function Foo2(_super) {
         var _this;
         _this = _super.call(this) || this;
-        this.prop4 = {
+        _this.prop4 = {
             doStuff: function (_super) {
             }
         };
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index 6a8dd340a2066..696f439a4b129 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -54,7 +54,7 @@ var b2 = (function (_super) {
     function b2(_super) {
         var _this;
         _this = _super.call(this) || this;
-        this._super = _super;
+        _this._super = _super;
     }
     return b2;
 }(a));
@@ -71,7 +71,7 @@ var b4 = (function (_super) {
     function b4(_super) {
         var _this;
         _this = _super.call(this) || this;
-        this._super = _super;
+        _this._super = _super;
     }
     return b4;
 }(a));
diff --git a/tests/baselines/reference/computedPropertyNames30_ES5.js b/tests/baselines/reference/computedPropertyNames30_ES5.js
index c31d873ffb942..9fbe5f380ca85 100644
--- a/tests/baselines/reference/computedPropertyNames30_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames30_ES5.js
@@ -36,7 +36,7 @@ var C = (function (_super) {
                 // Ideally, we would capture this. But the reference is
                 // illegal, and not capturing this is consistent with
                 //treatment of other similar violations.
-                _a[(_this = _super.call(_this) || _this, "prop")] = function () { },
+                _a[(_this = _super.call(this) || this, "prop")] = function () { },
                 _a);
             var _a;
         });
diff --git a/tests/baselines/reference/constructorArgs.js b/tests/baselines/reference/constructorArgs.js
index 3345708ddaa9c..2c2838c97f96f 100644
--- a/tests/baselines/reference/constructorArgs.js
+++ b/tests/baselines/reference/constructorArgs.js
@@ -31,7 +31,7 @@ var Sub = (function (_super) {
     function Sub(options) {
         var _this;
         _this = _super.call(this, options.value) || this;
-        this.options = options;
+        _this.options = options;
     }
     return Sub;
 }(Super));
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 4ccc090f4f240..50280b589b33d 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -81,7 +81,7 @@ var templa;
                     function AbstractCompositeElementController() {
                         var _this;
                         _this = _super.call(this) || this;
-                        this._controllers = [];
+                        _this._controllers = [];
                     }
                     return AbstractCompositeElementController;
                 }(templa.dom.mvc.AbstractElementController));
diff --git a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
index 75901c708b35e..58903b2ba5745 100644
--- a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
+++ b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
@@ -60,7 +60,7 @@ var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
         var _this;
-        var r2 = function () { return _this = _super.call(_this) || _this; }; // error for misplaced super call (nested function)
+        var r2 = function () { return _this = _super.call(this) || this; }; // error for misplaced super call (nested function)
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassParameterProperties.js b/tests/baselines/reference/derivedClassParameterProperties.js
index f7afd6529c0a1..658e56fb09819 100644
--- a/tests/baselines/reference/derivedClassParameterProperties.js
+++ b/tests/baselines/reference/derivedClassParameterProperties.js
@@ -119,7 +119,7 @@ var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(y) {
         var _this;
-        this.y = y;
+        _this.y = y;
         var a = 1;
         _this = _super.call(this) || this; // error
     }
@@ -130,7 +130,7 @@ var Derived3 = (function (_super) {
     function Derived3(y) {
         var _this;
         _this = _super.call(this) || this; // ok
-        this.y = y;
+        _this.y = y;
         var a = 1;
     }
     return Derived3;
@@ -139,7 +139,7 @@ var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(y) {
         var _this;
-        this.a = 1;
+        _this.a = 1;
         var b = 2;
         _this = _super.call(this) || this; // error
     }
@@ -150,7 +150,7 @@ var Derived5 = (function (_super) {
     function Derived5(y) {
         var _this;
         _this = _super.call(this) || this; // ok
-        this.a = 1;
+        _this.a = 1;
         var b = 2;
     }
     return Derived5;
@@ -159,7 +159,7 @@ var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(y) {
         var _this;
-        this.a = 1;
+        _this.a = 1;
         var b = 2;
         _this = _super.call(this) || this; // error: "super" has to be called before "this" accessing
     }
@@ -169,9 +169,9 @@ var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(y) {
         var _this;
-        this.a = 1;
-        this.a = 3;
-        this.b = 3;
+        _this.a = 1;
+        _this.a = 3;
+        _this.b = 3;
         _this = _super.call(this) || this; // error
     }
     return Derived7;
@@ -181,9 +181,9 @@ var Derived8 = (function (_super) {
     function Derived8(y) {
         var _this;
         _this = _super.call(this) || this; // ok
-        this.a = 1;
-        this.a = 3;
-        this.b = 3;
+        _this.a = 1;
+        _this.a = 3;
+        _this.b = 3;
     }
     return Derived8;
 }(Base));
@@ -197,9 +197,9 @@ var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(y) {
         var _this;
-        this.a = 1;
-        this.a = 3;
-        this.b = 3;
+        _this.a = 1;
+        _this.a = 3;
+        _this.b = 3;
         _this = _super.call(this) || this; // error
     }
     return Derived9;
@@ -209,9 +209,9 @@ var Derived10 = (function (_super) {
     function Derived10(y) {
         var _this;
         _this = _super.call(this) || this; // ok
-        this.a = 1;
-        this.a = 3;
-        this.b = 3;
+        _this.a = 1;
+        _this.a = 3;
+        _this.b = 3;
     }
     return Derived10;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
index ad2dc22debf54..6b06204b8e976 100644
--- a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
+++ b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
@@ -48,7 +48,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.a = _this = _super.call(this) || this;
+        _this.a = _this = _super.call(this) || this;
     }
     Derived.prototype.b = function () {
         _this = _super.call(this) || this;
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index a464970fe509d..e73d004120653 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -43,7 +43,7 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
         var _this;
-        _this = _super.call(this, this) || this; // ok
+        _this = _super.call(this, _this) || this; // ok
     }
     return Derived;
 }(Base));
@@ -51,8 +51,8 @@ var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
         var _this;
-        _this = _super.call(this, this) || this; // error
-        this.a = a;
+        _this = _super.call(this, _this) || this; // error
+        _this.a = a;
     }
     return Derived2;
 }(Base));
@@ -61,7 +61,7 @@ var Derived3 = (function (_super) {
     function Derived3(a) {
         var _this;
         _this = _super.call(this, function () { return _this; }) || this; // error
-        this.a = a;
+        _this.a = a;
     }
     return Derived3;
 }(Base));
@@ -70,7 +70,7 @@ var Derived4 = (function (_super) {
     function Derived4(a) {
         var _this;
         _this = _super.call(this, function () { return this; }) || this; // ok
-        this.a = a;
+        _this.a = a;
     }
     return Derived4;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
index 84028f1d3f2e5..cc260f094997e 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
@@ -43,8 +43,8 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 1;
-        this.y = 'hello';
+        _this.x = 1;
+        _this.y = 'hello';
     }
     return Derived;
 }(Base));
@@ -61,8 +61,8 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 2;
-        this.y = null;
+        _this.x = 2;
+        _this.y = null;
     }
     return D;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
index 6c3ce90d6f0ae..d3711ec27c0db 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
@@ -51,8 +51,8 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 1;
-        this.y = 'hello';
+        _this.x = 1;
+        _this.y = 'hello';
     }
     return Derived;
 }(Base));
@@ -71,8 +71,8 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 2;
-        this.y = null;
+        _this.x = 2;
+        _this.y = null;
     }
     return D;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
index 295fbac60e192..14f9fdf88af29 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
@@ -65,8 +65,8 @@ var Derived = (function (_super) {
     function Derived(y, z) {
         var _this;
         _this = _super.call(this, 2) || this;
-        this.b = '';
-        this.b = y;
+        _this.b = '';
+        _this.b = y;
     }
     return Derived;
 }(Base));
@@ -75,8 +75,8 @@ var Derived2 = (function (_super) {
     function Derived2() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 1;
-        this.y = 'hello';
+        _this.x = 1;
+        _this.y = 'hello';
     }
     return Derived2;
 }(Derived));
@@ -94,8 +94,8 @@ var D = (function (_super) {
     function D(y, z) {
         var _this;
         _this = _super.call(this, 2) || this;
-        this.b = null;
-        this.b = y;
+        _this.b = null;
+        _this.b = y;
     }
     return D;
 }(Base));
@@ -104,8 +104,8 @@ var D2 = (function (_super) {
     function D2() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 2;
-        this.y = null;
+        _this.x = 2;
+        _this.y = null;
     }
     return D2;
 }(D));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
index 4e07d5c8655b7..60fa8e32c1e2d 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
@@ -32,7 +32,7 @@ var B = (function (_super) {
         "use strict";
         'someStringForEgngInject';
         _this = _super.call(this) || this;
-        this.x = x;
+        _this.x = x;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
index b6eabb2a418a7..abef8394924e4 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
@@ -34,7 +34,7 @@ var B = (function (_super) {
         "use strict";
         'someStringForEgngInject';
         _this = _super.call(this) || this;
-        this.blub = 12;
+        _this.blub = 12;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
index 0e866e98f4670..0f36d9d9115f9 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
@@ -32,8 +32,8 @@ var B = (function (_super) {
         "use strict";
         'someStringForEgngInject';
         _this = _super.call(this) || this;
-        this.x = x;
-        this.blah = 2;
+        _this.x = x;
+        _this.blah = 2;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/errorSuperCalls.js b/tests/baselines/reference/errorSuperCalls.js
index 765fdf083b53c..4f54781deb993 100644
--- a/tests/baselines/reference/errorSuperCalls.js
+++ b/tests/baselines/reference/errorSuperCalls.js
@@ -133,7 +133,7 @@ var Derived = (function (_super) {
     //super call with type arguments 
     function Derived() {
         var _this;
-        _super.prototype..call(this);
+        _super.prototype..call(_this);
         _this = _super.call(this) || this;
     }
     return Derived;
@@ -149,7 +149,7 @@ var OtherDerived = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         //super call in class member initializer of derived type
-        this.t = _this = _super.call(this) || this;
+        _this.t = _this = _super.call(this) || this;
     }
     OtherDerived.prototype.fn = function () {
         //super call in class member function of derived type
diff --git a/tests/baselines/reference/es6ClassTest.js b/tests/baselines/reference/es6ClassTest.js
index 0a6323630fb4b..4b2cb2c51b55d 100644
--- a/tests/baselines/reference/es6ClassTest.js
+++ b/tests/baselines/reference/es6ClassTest.js
@@ -105,12 +105,12 @@ var Foo = (function (_super) {
         var _this;
         if (z === void 0) { z = 0; }
         _this = _super.call(this, x) || this;
-        this.y = y;
-        this.z = z;
-        this.gar = 0;
-        this.zoo = "zoo";
-        this.x = x;
-        this.gar = 5;
+        _this.y = y;
+        _this.z = z;
+        _this.gar = 0;
+        _this.zoo = "zoo";
+        _this.x = x;
+        _this.gar = 5;
     }
     Foo.prototype.bar = function () { return 0; };
     Foo.prototype.boo = function (x) { return x; };
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
index 226fede58b693..49109e1aa5af1 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
@@ -61,7 +61,7 @@ var TypeScript;
         function PullTypeSymbol() {
             var _this;
             _this = _super.apply(this, arguments) || this;
-            this._elementType = null;
+            _this._elementType = null;
         }
         PullTypeSymbol.prototype.toString = function (scopeSymbol, useConstraintInName) {
             var s = this.getScopedNameEx(scopeSymbol, useConstraintInName).toString();
diff --git a/tests/baselines/reference/illegalSuperCallsInConstructor.js b/tests/baselines/reference/illegalSuperCallsInConstructor.js
index e27a9789cb149..77f0a0a2b6b3f 100644
--- a/tests/baselines/reference/illegalSuperCallsInConstructor.js
+++ b/tests/baselines/reference/illegalSuperCallsInConstructor.js
@@ -35,8 +35,8 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
         var _this;
-        var r2 = function () { return _this = _super.call(_this) || _this; };
-        var r3 = function () { _this = _super.call(_this) || _this; };
+        var r2 = function () { return _this = _super.call(this) || this; };
+        var r3 = function () { _this = _super.call(this) || this; };
         var r4 = function () { _this = _super.call(this) || this; };
         var r5 = {
             get foo() {
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
index 6f35c3f0e40ab..3f205640f5981 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
@@ -41,8 +41,8 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 2;
-        this.y = 3;
+        _this.x = 2;
+        _this.y = 3;
     }
     D.prototype.foo = function (x) { return x; };
     D.prototype.other = function (x) { return x; };
@@ -54,7 +54,7 @@ var D2 = (function (_super) {
     function D2() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = "";
+        _this.x = "";
     }
     D2.prototype.foo = function (x) { return x; };
     D2.prototype.other = function (x) { return x; };
diff --git a/tests/baselines/reference/objectCreationOfElementAccessExpression.js b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
index ddfbce8fc127f..9543082fbd16a 100644
--- a/tests/baselines/reference/objectCreationOfElementAccessExpression.js
+++ b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
@@ -83,7 +83,7 @@ var MonsterFood = (function (_super) {
     function MonsterFood(name, flavor) {
         var _this;
         _this = _super.call(this, name) || this;
-        this.flavor = flavor;
+        _this.flavor = flavor;
     }
     return MonsterFood;
 }(Food));
@@ -92,7 +92,7 @@ var IceCream = (function (_super) {
     function IceCream(flavor) {
         var _this;
         _this = _super.call(this, "Ice Cream", flavor) || this;
-        this.flavor = flavor;
+        _this.flavor = flavor;
     }
     return IceCream;
 }(MonsterFood));
@@ -101,8 +101,8 @@ var Cookie = (function (_super) {
     function Cookie(flavor, isGlutenFree) {
         var _this;
         _this = _super.call(this, "Cookie", flavor) || this;
-        this.flavor = flavor;
-        this.isGlutenFree = isGlutenFree;
+        _this.flavor = flavor;
+        _this.isGlutenFree = isGlutenFree;
     }
     return Cookie;
 }(MonsterFood));
@@ -111,7 +111,7 @@ var PetFood = (function (_super) {
     function PetFood(name, whereToBuy) {
         var _this;
         _this = _super.call(this, name) || this;
-        this.whereToBuy = whereToBuy;
+        _this.whereToBuy = whereToBuy;
     }
     return PetFood;
 }(Food));
@@ -120,7 +120,7 @@ var ExpensiveOrganicDogFood = (function (_super) {
     function ExpensiveOrganicDogFood(whereToBuy) {
         var _this;
         _this = _super.call(this, "Origen", whereToBuy) || this;
-        this.whereToBuy = whereToBuy;
+        _this.whereToBuy = whereToBuy;
     }
     return ExpensiveOrganicDogFood;
 }(PetFood));
@@ -129,8 +129,8 @@ var ExpensiveOrganicCatFood = (function (_super) {
     function ExpensiveOrganicCatFood(whereToBuy, containsFish) {
         var _this;
         _this = _super.call(this, "Nature's Logic", whereToBuy) || this;
-        this.whereToBuy = whereToBuy;
-        this.containsFish = containsFish;
+        _this.whereToBuy = whereToBuy;
+        _this.containsFish = containsFish;
     }
     return ExpensiveOrganicCatFood;
 }(PetFood));
diff --git a/tests/baselines/reference/optionalMethods.js b/tests/baselines/reference/optionalMethods.js
index 408f73b653302..1885c419fef8b 100644
--- a/tests/baselines/reference/optionalMethods.js
+++ b/tests/baselines/reference/optionalMethods.js
@@ -111,7 +111,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.a = 1;
+        _this.a = 1;
     }
     Derived.prototype.f = function () { return 1; };
     return Derived;
diff --git a/tests/baselines/reference/optionalParameterProperty.js b/tests/baselines/reference/optionalParameterProperty.js
index b23da97c7902d..44eb2a7aa5628 100644
--- a/tests/baselines/reference/optionalParameterProperty.js
+++ b/tests/baselines/reference/optionalParameterProperty.js
@@ -27,7 +27,7 @@ var D = (function (_super) {
     function D(p) {
         var _this;
         _this = _super.call(this) || this;
-        this.p = p;
+        _this.p = p;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks4.js b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
index 6a75061239549..22bacbdb0b4c2 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks4.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
@@ -29,7 +29,7 @@ var A = (function (_super) {
     function A() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = 1;
+        _this.x = 1;
     }
     return A;
 }(Z));
diff --git a/tests/baselines/reference/parserAstSpans1.js b/tests/baselines/reference/parserAstSpans1.js
index 6e6a423fe906f..365e640c15099 100644
--- a/tests/baselines/reference/parserAstSpans1.js
+++ b/tests/baselines/reference/parserAstSpans1.js
@@ -320,7 +320,7 @@ var c3 = (function (_super) {
     function c3() {
         var _this;
         _this = _super.call(this, 10) || this;
-        this.p1 = _super.prototype.c2_p1;
+        _this.p1 = _super.prototype.c2_p1;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
@@ -408,7 +408,7 @@ var c6 = (function (_super) {
     function c6() {
         var _this;
         _this = _super.call(this) || this;
-        this.d = _super.prototype.b;
+        _this.d = _super.prototype.b;
     }
     return c6;
 }(c5));
diff --git a/tests/baselines/reference/parserRealSource10.js b/tests/baselines/reference/parserRealSource10.js
index 429a388c894b2..c9f011704d035 100644
--- a/tests/baselines/reference/parserRealSource10.js
+++ b/tests/baselines/reference/parserRealSource10.js
@@ -828,8 +828,8 @@ var TypeScript;
         function NumberLiteralToken(value, hasEmptyFraction) {
             var _this;
             _this = _super.call(this, TokenID.NumberLiteral) || this;
-            this.value = value;
-            this.hasEmptyFraction = hasEmptyFraction;
+            _this.value = value;
+            _this.hasEmptyFraction = hasEmptyFraction;
         }
         NumberLiteralToken.prototype.getText = function () {
             return this.hasEmptyFraction ? this.value.toString() + ".0" : this.value.toString();
@@ -845,7 +845,7 @@ var TypeScript;
         function StringLiteralToken(value) {
             var _this;
             _this = _super.call(this, TokenID.StringLiteral) || this;
-            this.value = value;
+            _this.value = value;
         }
         StringLiteralToken.prototype.getText = function () {
             return this.value;
@@ -861,8 +861,8 @@ var TypeScript;
         function IdentifierToken(value, hasEscapeSequence) {
             var _this;
             _this = _super.call(this, TokenID.Identifier) || this;
-            this.value = value;
-            this.hasEscapeSequence = hasEscapeSequence;
+            _this.value = value;
+            _this.hasEscapeSequence = hasEscapeSequence;
         }
         IdentifierToken.prototype.getText = function () {
             return this.value;
@@ -878,7 +878,7 @@ var TypeScript;
         function WhitespaceToken(tokenId, value) {
             var _this;
             _this = _super.call(this, tokenId) || this;
-            this.value = value;
+            _this.value = value;
         }
         WhitespaceToken.prototype.getText = function () {
             return this.value;
@@ -894,11 +894,11 @@ var TypeScript;
         function CommentToken(tokenID, value, isBlock, startPos, line, endsLine) {
             var _this;
             _this = _super.call(this, tokenID) || this;
-            this.value = value;
-            this.isBlock = isBlock;
-            this.startPos = startPos;
-            this.line = line;
-            this.endsLine = endsLine;
+            _this.value = value;
+            _this.isBlock = isBlock;
+            _this.startPos = startPos;
+            _this.line = line;
+            _this.endsLine = endsLine;
         }
         CommentToken.prototype.getText = function () {
             return this.value;
@@ -914,7 +914,7 @@ var TypeScript;
         function RegularExpressionLiteralToken(regex) {
             var _this;
             _this = _super.call(this, TokenID.RegularExpressionLiteral) || this;
-            this.regex = regex;
+            _this.regex = regex;
         }
         RegularExpressionLiteralToken.prototype.getText = function () {
             return this.regex.toString();
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index 4be1ed2076762..054608e9d19ab 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2388,14 +2388,14 @@ var TypeScript;
         function AST(nodeType) {
             var _this;
             _this = _super.call(this) || this;
-            this.nodeType = nodeType;
-            this.type = null;
-            this.flags = ASTFlags.Writeable;
+            _this.nodeType = nodeType;
+            _this.type = null;
+            _this.flags = ASTFlags.Writeable;
             // REVIEW: for diagnostic purposes
-            this.passCreated = CompilerDiagnostics.analysisPass;
-            this.preComments = null;
-            this.postComments = null;
-            this.isParenthesized = false;
+            _this.passCreated = CompilerDiagnostics.analysisPass;
+            _this.preComments = null;
+            _this.postComments = null;
+            _this.isParenthesized = false;
         }
         AST.prototype.isExpression = function () { return false; };
         AST.prototype.isStatementOrExpression = function () { return false; };
@@ -2545,8 +2545,8 @@ var TypeScript;
         function IncompleteAST(min, lim) {
             var _this;
             _this = _super.call(this, NodeType.Error) || this;
-            this.minChar = min;
-            this.limChar = lim;
+            _this.minChar = min;
+            _this.limChar = lim;
         }
         return IncompleteAST;
     }(AST));
@@ -2556,8 +2556,8 @@ var TypeScript;
         function ASTList() {
             var _this;
             _this = _super.call(this, NodeType.List) || this;
-            this.enclosingScope = null;
-            this.members = new AST[];
+            _this.enclosingScope = null;
+            _this.members = new AST[];
         }
         ASTList.prototype.addToControlFlow = function (context) {
             var len = this.members.length;
@@ -2624,11 +2624,11 @@ var TypeScript;
         function Identifier(actualText, hasEscapeSequence) {
             var _this;
             _this = _super.call(this, NodeType.Name) || this;
-            this.actualText = actualText;
-            this.hasEscapeSequence = hasEscapeSequence;
-            this.sym = null;
-            this.cloId = -1;
-            this.setText(actualText, hasEscapeSequence);
+            _this.actualText = actualText;
+            _this.hasEscapeSequence = hasEscapeSequence;
+            _this.sym = null;
+            _this.cloId = -1;
+            _this.setText(actualText, hasEscapeSequence);
         }
         Identifier.prototype.setText = function (actualText, hasEscapeSequence) {
             this.actualText = actualText;
@@ -2684,7 +2684,7 @@ var TypeScript;
         function Label(id) {
             var _this;
             _this = _super.call(this, NodeType.Label) || this;
-            this.id = id;
+            _this.id = id;
         }
         Label.prototype.printLabel = function () { return this.id.actualText + ":"; };
         Label.prototype.typeCheck = function (typeFlow) {
@@ -2720,9 +2720,9 @@ var TypeScript;
         function UnaryExpression(nodeType, operand) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.operand = operand;
-            this.targetType = null; // Target type for an object literal (null if no target type)
-            this.castTerm = null;
+            _this.operand = operand;
+            _this.targetType = null; // Target type for an object literal (null if no target type)
+            _this.castTerm = null;
         }
         UnaryExpression.prototype.addToControlFlow = function (context) {
             _super.prototype.addToControlFlow.call(this, context);
@@ -2865,10 +2865,10 @@ var TypeScript;
         function CallExpression(nodeType, target, arguments) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.target = target;
-            this.arguments = arguments;
-            this.signature = null;
-            this.minChar = this.target.minChar;
+            _this.target = target;
+            _this.arguments = arguments;
+            _this.signature = null;
+            _this.minChar = _this.target.minChar;
         }
         CallExpression.prototype.typeCheck = function (typeFlow) {
             if (this.nodeType == NodeType.New) {
@@ -2898,8 +2898,8 @@ var TypeScript;
         function BinaryExpression(nodeType, operand1, operand2) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.operand1 = operand1;
-            this.operand2 = operand2;
+            _this.operand1 = operand1;
+            _this.operand2 = operand2;
         }
         BinaryExpression.prototype.typeCheck = function (typeFlow) {
             switch (this.nodeType) {
@@ -3051,9 +3051,9 @@ var TypeScript;
         function ConditionalExpression(operand1, operand2, operand3) {
             var _this;
             _this = _super.call(this, NodeType.ConditionalExpression) || this;
-            this.operand1 = operand1;
-            this.operand2 = operand2;
-            this.operand3 = operand3;
+            _this.operand1 = operand1;
+            _this.operand2 = operand2;
+            _this.operand3 = operand3;
         }
         ConditionalExpression.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckQMark(this);
@@ -3077,9 +3077,9 @@ var TypeScript;
         function NumberLiteral(value, hasEmptyFraction) {
             var _this;
             _this = _super.call(this, NodeType.NumberLit) || this;
-            this.value = value;
-            this.hasEmptyFraction = hasEmptyFraction;
-            this.isNegativeZero = false;
+            _this.value = value;
+            _this.hasEmptyFraction = hasEmptyFraction;
+            _this.isNegativeZero = false;
         }
         NumberLiteral.prototype.typeCheck = function (typeFlow) {
             this.type = typeFlow.doubleType;
@@ -3119,7 +3119,7 @@ var TypeScript;
         function RegexLiteral(regex) {
             var _this;
             _this = _super.call(this, NodeType.Regex) || this;
-            this.regex = regex;
+            _this.regex = regex;
         }
         RegexLiteral.prototype.typeCheck = function (typeFlow) {
             this.type = typeFlow.regexType;
@@ -3140,7 +3140,7 @@ var TypeScript;
         function StringLiteral(text) {
             var _this;
             _this = _super.call(this, NodeType.QString) || this;
-            this.text = text;
+            _this.text = text;
         }
         StringLiteral.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3176,10 +3176,10 @@ var TypeScript;
         function ImportDeclaration(id, alias) {
             var _this;
             _this = _super.call(this, NodeType.ImportDeclaration) || this;
-            this.id = id;
-            this.alias = alias;
-            this.varFlags = VarFlags.None;
-            this.isDynamicImport = false;
+            _this.id = id;
+            _this.alias = alias;
+            _this.varFlags = VarFlags.None;
+            _this.isDynamicImport = false;
         }
         ImportDeclaration.prototype.isStatementOrExpression = function () { return true; };
         ImportDeclaration.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3236,12 +3236,12 @@ var TypeScript;
         function BoundDecl(id, nodeType, nestingLevel) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.id = id;
-            this.nestingLevel = nestingLevel;
-            this.init = null;
-            this.typeExpr = null;
-            this.varFlags = VarFlags.None;
-            this.sym = null;
+            _this.id = id;
+            _this.nestingLevel = nestingLevel;
+            _this.init = null;
+            _this.typeExpr = null;
+            _this.varFlags = VarFlags.None;
+            _this.sym = null;
         }
         BoundDecl.prototype.isStatementOrExpression = function () { return true; };
         BoundDecl.prototype.isPrivate = function () { return hasFlag(this.varFlags, VarFlags.Private); };
@@ -3279,8 +3279,8 @@ var TypeScript;
         function ArgDecl(id) {
             var _this;
             _this = _super.call(this, id, NodeType.ArgDecl, 0) || this;
-            this.isOptional = false;
-            this.parameterPropertySym = null;
+            _this.isOptional = false;
+            _this.parameterPropertySym = null;
         }
         ArgDecl.prototype.isOptionalArg = function () { return this.isOptional || this.init; };
         ArgDecl.prototype.treeViewLabel = function () {
@@ -3302,35 +3302,35 @@ var TypeScript;
         function FuncDecl(name, bod, isConstructor, arguments, vars, scopes, statics, nodeType) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.name = name;
-            this.bod = bod;
-            this.isConstructor = isConstructor;
-            this.arguments = arguments;
-            this.vars = vars;
-            this.scopes = scopes;
-            this.statics = statics;
-            this.hint = null;
-            this.fncFlags = FncFlags.None;
-            this.returnTypeAnnotation = null;
-            this.variableArgList = false;
-            this.jumpRefs = null;
-            this.internalNameCache = null;
-            this.tmp1Declared = false;
-            this.enclosingFnc = null;
-            this.freeVariables = [];
-            this.unitIndex = -1;
-            this.classDecl = null;
-            this.boundToProperty = null;
-            this.isOverload = false;
-            this.innerStaticFuncs = [];
-            this.isTargetTypedAsMethod = false;
-            this.isInlineCallLiteral = false;
-            this.accessorSymbol = null;
-            this.leftCurlyCount = 0;
-            this.rightCurlyCount = 0;
-            this.returnStatementsWithExpressions = [];
-            this.scopeType = null; // Type of the FuncDecl, before target typing
-            this.endingToken = null;
+            _this.name = name;
+            _this.bod = bod;
+            _this.isConstructor = isConstructor;
+            _this.arguments = arguments;
+            _this.vars = vars;
+            _this.scopes = scopes;
+            _this.statics = statics;
+            _this.hint = null;
+            _this.fncFlags = FncFlags.None;
+            _this.returnTypeAnnotation = null;
+            _this.variableArgList = false;
+            _this.jumpRefs = null;
+            _this.internalNameCache = null;
+            _this.tmp1Declared = false;
+            _this.enclosingFnc = null;
+            _this.freeVariables = [];
+            _this.unitIndex = -1;
+            _this.classDecl = null;
+            _this.boundToProperty = null;
+            _this.isOverload = false;
+            _this.innerStaticFuncs = [];
+            _this.isTargetTypedAsMethod = false;
+            _this.isInlineCallLiteral = false;
+            _this.accessorSymbol = null;
+            _this.leftCurlyCount = 0;
+            _this.rightCurlyCount = 0;
+            _this.returnStatementsWithExpressions = [];
+            _this.scopeType = null; // Type of the FuncDecl, before target typing
+            _this.endingToken = null;
         }
         FuncDecl.prototype.internalName = function () {
             if (this.internalNameCache == null) {
@@ -3443,21 +3443,21 @@ var TypeScript;
         function Script(vars, scopes) {
             var _this;
             _this = _super.call(this, new Identifier("script"), null, false, null, vars, scopes, null, NodeType.Script) || this;
-            this.locationInfo = null;
-            this.referencedFiles = [];
-            this.requiresGlobal = false;
-            this.requiresInherits = false;
-            this.isResident = false;
-            this.isDeclareFile = false;
-            this.hasBeenTypeChecked = false;
-            this.topLevelMod = null;
-            this.leftCurlyCount = 0;
-            this.rightCurlyCount = 0;
+            _this.locationInfo = null;
+            _this.referencedFiles = [];
+            _this.requiresGlobal = false;
+            _this.requiresInherits = false;
+            _this.isResident = false;
+            _this.isDeclareFile = false;
+            _this.hasBeenTypeChecked = false;
+            _this.topLevelMod = null;
+            _this.leftCurlyCount = 0;
+            _this.rightCurlyCount = 0;
             // Remember if the script contains Unicode chars, that is needed when generating code for this script object to decide the output file correct encoding.
-            this.containsUnicodeChar = false;
-            this.containsUnicodeCharInComment = false;
-            this.vars = vars;
-            this.scopes = scopes;
+            _this.containsUnicodeChar = false;
+            _this.containsUnicodeCharInComment = false;
+            _this.vars = vars;
+            _this.scopes = scopes;
         }
         Script.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckScript(this);
@@ -3513,10 +3513,10 @@ var TypeScript;
         function NamedDeclaration(nodeType, name, members) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.name = name;
-            this.members = members;
-            this.leftCurlyCount = 0;
-            this.rightCurlyCount = 0;
+            _this.name = name;
+            _this.members = members;
+            _this.leftCurlyCount = 0;
+            _this.rightCurlyCount = 0;
         }
         return NamedDeclaration;
     }(ModuleElement));
@@ -3526,15 +3526,15 @@ var TypeScript;
         function ModuleDeclaration(name, members, vars, scopes, endingToken) {
             var _this;
             _this = _super.call(this, NodeType.ModuleDeclaration, name, members) || this;
-            this.endingToken = endingToken;
-            this.modFlags = ModuleFlags.ShouldEmitModuleDecl;
-            this.amdDependencies = [];
+            _this.endingToken = endingToken;
+            _this.modFlags = ModuleFlags.ShouldEmitModuleDecl;
+            _this.amdDependencies = [];
             // Remember if the module contains Unicode chars, that is needed for dynamic module as we will generate a file for each.
-            this.containsUnicodeChar = false;
-            this.containsUnicodeCharInComment = false;
-            this.vars = vars;
-            this.scopes = scopes;
-            this.prettyName = this.name.actualText;
+            _this.containsUnicodeChar = false;
+            _this.containsUnicodeCharInComment = false;
+            _this.vars = vars;
+            _this.scopes = scopes;
+            _this.prettyName = _this.name.actualText;
         }
         ModuleDeclaration.prototype.isExported = function () { return hasFlag(this.modFlags, ModuleFlags.Exported); };
         ModuleDeclaration.prototype.isAmbient = function () { return hasFlag(this.modFlags, ModuleFlags.Ambient); };
@@ -3562,9 +3562,9 @@ var TypeScript;
         function TypeDeclaration(nodeType, name, extendsList, implementsList, members) {
             var _this;
             _this = _super.call(this, nodeType, name, members) || this;
-            this.extendsList = extendsList;
-            this.implementsList = implementsList;
-            this.varFlags = VarFlags.None;
+            _this.extendsList = extendsList;
+            _this.implementsList = implementsList;
+            _this.varFlags = VarFlags.None;
         }
         TypeDeclaration.prototype.isExported = function () {
             return hasFlag(this.varFlags, VarFlags.Exported);
@@ -3580,10 +3580,10 @@ var TypeScript;
         function ClassDeclaration(name, members, extendsList, implementsList) {
             var _this;
             _this = _super.call(this, NodeType.ClassDeclaration, name, extendsList, implementsList, members) || this;
-            this.knownMemberNames = {};
-            this.constructorDecl = null;
-            this.constructorNestingLevel = 0;
-            this.endingToken = null;
+            _this.knownMemberNames = {};
+            _this.constructorDecl = null;
+            _this.constructorNestingLevel = 0;
+            _this.endingToken = null;
         }
         ClassDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckClass(this);
@@ -3613,7 +3613,7 @@ var TypeScript;
         function Statement(nodeType) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.flags |= ASTFlags.IsStatement;
+            _this.flags |= ASTFlags.IsStatement;
         }
         Statement.prototype.isLoop = function () { return false; };
         Statement.prototype.isStatementOrExpression = function () { return true; };
@@ -3630,8 +3630,8 @@ var TypeScript;
         function LabeledStatement(labels, stmt) {
             var _this;
             _this = _super.call(this, NodeType.LabeledStatement) || this;
-            this.labels = labels;
-            this.stmt = stmt;
+            _this.labels = labels;
+            _this.stmt = stmt;
         }
         LabeledStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3665,8 +3665,8 @@ var TypeScript;
         function Block(statements, isStatementBlock) {
             var _this;
             _this = _super.call(this, NodeType.Block) || this;
-            this.statements = statements;
-            this.isStatementBlock = isStatementBlock;
+            _this.statements = statements;
+            _this.isStatementBlock = isStatementBlock;
         }
         Block.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3721,8 +3721,8 @@ var TypeScript;
         function Jump(nodeType) {
             var _this;
             _this = _super.call(this, nodeType) || this;
-            this.target = null;
-            this.resolvedTarget = null;
+            _this.target = null;
+            _this.resolvedTarget = null;
         }
         Jump.prototype.hasExplicitTarget = function () { return (this.target); };
         Jump.prototype.setResolvedTarget = function (parser, stmt) {
@@ -3773,8 +3773,8 @@ var TypeScript;
         function WhileStatement(cond) {
             var _this;
             _this = _super.call(this, NodeType.While) || this;
-            this.cond = cond;
-            this.body = null;
+            _this.cond = cond;
+            _this.body = null;
         }
         WhileStatement.prototype.isLoop = function () { return true; };
         WhileStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3826,9 +3826,9 @@ var TypeScript;
         function DoWhileStatement() {
             var _this;
             _this = _super.call(this, NodeType.DoWhile) || this;
-            this.body = null;
-            this.whileAST = null;
-            this.cond = null;
+            _this.body = null;
+            _this.whileAST = null;
+            _this.cond = null;
         }
         DoWhileStatement.prototype.isLoop = function () { return true; };
         DoWhileStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3883,9 +3883,9 @@ var TypeScript;
         function IfStatement(cond) {
             var _this;
             _this = _super.call(this, NodeType.If) || this;
-            this.cond = cond;
-            this.elseBod = null;
-            this.statement = new ASTSpan();
+            _this.cond = cond;
+            _this.elseBod = null;
+            _this.statement = new ASTSpan();
         }
         IfStatement.prototype.isCompoundStatement = function () { return true; };
         IfStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3962,7 +3962,7 @@ var TypeScript;
         function ReturnStatement() {
             var _this;
             _this = _super.call(this, NodeType.Return) || this;
-            this.returnExpression = null;
+            _this.returnExpression = null;
         }
         ReturnStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4003,11 +4003,11 @@ var TypeScript;
         function ForInStatement(lval, obj) {
             var _this;
             _this = _super.call(this, NodeType.ForIn) || this;
-            this.lval = lval;
-            this.obj = obj;
-            this.statement = new ASTSpan();
-            if (this.lval && (this.lval.nodeType == NodeType.VarDecl)) {
-                this.lval.varFlags |= VarFlags.AutoInit;
+            _this.lval = lval;
+            _this.obj = obj;
+            _this.statement = new ASTSpan();
+            if (_this.lval && (_this.lval.nodeType == NodeType.VarDecl)) {
+                _this.lval.varFlags |= VarFlags.AutoInit;
             }
         }
         ForInStatement.prototype.isLoop = function () { return true; };
@@ -4119,7 +4119,7 @@ var TypeScript;
         function ForStatement(init) {
             var _this;
             _this = _super.call(this, NodeType.For) || this;
-            this.init = init;
+            _this.init = init;
         }
         ForStatement.prototype.isLoop = function () { return true; };
         ForStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4211,8 +4211,8 @@ var TypeScript;
         function WithStatement(expr) {
             var _this;
             _this = _super.call(this, NodeType.With) || this;
-            this.expr = expr;
-            this.withSym = null;
+            _this.expr = expr;
+            _this.withSym = null;
         }
         WithStatement.prototype.isCompoundStatement = function () { return true; };
         WithStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4238,9 +4238,9 @@ var TypeScript;
         function SwitchStatement(val) {
             var _this;
             _this = _super.call(this, NodeType.Switch) || this;
-            this.val = val;
-            this.defaultCase = null;
-            this.statement = new ASTSpan();
+            _this.val = val;
+            _this.defaultCase = null;
+            _this.statement = new ASTSpan();
         }
         SwitchStatement.prototype.isCompoundStatement = function () { return true; };
         SwitchStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4311,7 +4311,7 @@ var TypeScript;
         function CaseStatement() {
             var _this;
             _this = _super.call(this, NodeType.Case) || this;
-            this.expr = null;
+            _this.expr = null;
         }
         CaseStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4365,8 +4365,8 @@ var TypeScript;
         function TypeReference(term, arrayCount) {
             var _this;
             _this = _super.call(this, NodeType.TypeRef) || this;
-            this.term = term;
-            this.arrayCount = arrayCount;
+            _this.term = term;
+            _this.arrayCount = arrayCount;
         }
         TypeReference.prototype.emit = function (emitter, tokenId, startLine) {
             throw new Error("should not emit a type ref");
@@ -4396,8 +4396,8 @@ var TypeScript;
         function TryFinally(tryNode, finallyNode) {
             var _this;
             _this = _super.call(this, NodeType.TryFinally) || this;
-            this.tryNode = tryNode;
-            this.finallyNode = finallyNode;
+            _this.tryNode = tryNode;
+            _this.finallyNode = finallyNode;
         }
         TryFinally.prototype.isCompoundStatement = function () { return true; };
         TryFinally.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4442,8 +4442,8 @@ var TypeScript;
         function TryCatch(tryNode, catchNode) {
             var _this;
             _this = _super.call(this, NodeType.TryCatch) || this;
-            this.tryNode = tryNode;
-            this.catchNode = catchNode;
+            _this.tryNode = tryNode;
+            _this.catchNode = catchNode;
         }
         TryCatch.prototype.isCompoundStatement = function () { return true; };
         TryCatch.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4493,7 +4493,7 @@ var TypeScript;
         function Try(body) {
             var _this;
             _this = _super.call(this, NodeType.Try) || this;
-            this.body = body;
+            _this.body = body;
         }
         Try.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4522,12 +4522,12 @@ var TypeScript;
         function Catch(param, body) {
             var _this;
             _this = _super.call(this, NodeType.Catch) || this;
-            this.param = param;
-            this.body = body;
-            this.statement = new ASTSpan();
-            this.containedScope = null;
-            if (this.param) {
-                this.param.varFlags |= VarFlags.AutoInit;
+            _this.param = param;
+            _this.body = body;
+            _this.statement = new ASTSpan();
+            _this.containedScope = null;
+            if (_this.param) {
+                _this.param.varFlags |= VarFlags.AutoInit;
             }
         }
         Catch.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4596,7 +4596,7 @@ var TypeScript;
         function Finally(body) {
             var _this;
             _this = _super.call(this, NodeType.Finally) || this;
-            this.body = body;
+            _this.body = body;
         }
         Finally.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4625,10 +4625,10 @@ var TypeScript;
         function Comment(content, isBlockComment, endsLine) {
             var _this;
             _this = _super.call(this, NodeType.Comment) || this;
-            this.content = content;
-            this.isBlockComment = isBlockComment;
-            this.endsLine = endsLine;
-            this.text = null;
+            _this.content = content;
+            _this.isBlockComment = isBlockComment;
+            _this.endsLine = endsLine;
+            _this.text = null;
         }
         Comment.prototype.getText = function () {
             if (this.text == null) {
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index 3f7e05e7164c9..f0db6078832e5 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2382,8 +2382,8 @@ var Harness;
         function TestCase(description, block) {
             var _this;
             _this = _super.call(this, description, block) || this;
-            this.description = description;
-            this.block = block;
+            _this.description = description;
+            _this.block = block;
         }
         TestCase.prototype.addChild = function (child) {
             throw new Error("Testcases may not be nested inside other testcases");
@@ -2417,8 +2417,8 @@ var Harness;
         function Scenario(description, block) {
             var _this;
             _this = _super.call(this, description, block) || this;
-            this.description = description;
-            this.block = block;
+            _this.description = description;
+            _this.block = block;
         }
         /** Run the block, and if the block doesn't raise an error, run the children. */
         Scenario.prototype.run = function (done) {
diff --git a/tests/baselines/reference/privateInstanceMemberAccessibility.js b/tests/baselines/reference/privateInstanceMemberAccessibility.js
index cfdc137aedff9..618c38b89d58f 100644
--- a/tests/baselines/reference/privateInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/privateInstanceMemberAccessibility.js
@@ -29,8 +29,8 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.x = _super.prototype.foo; // error
-        this.z = _super.prototype.foo; // error
+        _this.x = _super.prototype.foo; // error
+        _this.z = _super.prototype.foo; // error
     }
     Derived.prototype.y = function () {
         return _super.prototype.foo; // error
diff --git a/tests/baselines/reference/privateStaticMemberAccessibility.js b/tests/baselines/reference/privateStaticMemberAccessibility.js
index aad41d01b075f..e953198290b73 100644
--- a/tests/baselines/reference/privateStaticMemberAccessibility.js
+++ b/tests/baselines/reference/privateStaticMemberAccessibility.js
@@ -24,7 +24,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.bing = function () { return Base.foo; }; // error
+        _this.bing = function () { return Base.foo; }; // error
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/readonlyConstructorAssignment.js b/tests/baselines/reference/readonlyConstructorAssignment.js
index 1c1e2a94ff171..f1b69ecc00b30 100644
--- a/tests/baselines/reference/readonlyConstructorAssignment.js
+++ b/tests/baselines/reference/readonlyConstructorAssignment.js
@@ -59,7 +59,7 @@ var B = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         // Fails, x is readonly
-        this.x = 1;
+        _this.x = 1;
     }
     return B;
 }(A));
@@ -70,8 +70,8 @@ var C = (function (_super) {
     function C(x) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.x = x;
-        this.x = 1;
+        _this.x = x;
+        _this.x = 1;
     }
     return C;
 }(A));
@@ -88,8 +88,8 @@ var E = (function (_super) {
     function E(x) {
         var _this;
         _this = _super.call(this, x) || this;
-        this.x = x;
-        this.x = 1;
+        _this.x = x;
+        _this.x = 1;
     }
     return E;
 }(D));
diff --git a/tests/baselines/reference/scopeTests.js b/tests/baselines/reference/scopeTests.js
index e9394a64c9b83..3fd9018e94575 100644
--- a/tests/baselines/reference/scopeTests.js
+++ b/tests/baselines/reference/scopeTests.js
@@ -27,8 +27,8 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
-        this.v = 1;
-        this.p = 1;
+        _this.v = 1;
+        _this.p = 1;
         C.s = 1;
     }
     return D;
diff --git a/tests/baselines/reference/staticInheritance.js b/tests/baselines/reference/staticInheritance.js
index 8b4b8326cab07..462f2382f3cd3 100644
--- a/tests/baselines/reference/staticInheritance.js
+++ b/tests/baselines/reference/staticInheritance.js
@@ -29,8 +29,8 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.p1 = doThing(A); // OK
-        this.p2 = doThing(B); // OK
+        _this.p1 = doThing(A); // OK
+        _this.p2 = doThing(B); // OK
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/staticPropSuper.js b/tests/baselines/reference/staticPropSuper.js
index b2eea36eece14..f5bac0135af14 100644
--- a/tests/baselines/reference/staticPropSuper.js
+++ b/tests/baselines/reference/staticPropSuper.js
@@ -60,7 +60,7 @@ var C = (function (_super) {
     __extends(C, _super);
     function C() {
         var _this;
-        this.p = 10;
+        _this.p = 10;
         var x = 1; // should error
     }
     return C;
@@ -69,7 +69,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        this.p = 11;
+        _this.p = 11;
         var x = 1; // should error
     }
     return D;
@@ -78,7 +78,7 @@ var E = (function (_super) {
     __extends(E, _super);
     function E() {
         var _this;
-        this.p = 12;
+        _this.p = 12;
         var x = 1; // should error
     }
     return E;
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index e40e0c45a59a1..1af13b1ce7a3e 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -77,7 +77,7 @@ var B = (function (_super) {
         var _this;
         "use strict"; // No error
         _this = _super.call(this) || this;
-        this.s = 9;
+        _this.s = 9;
     }
     return B;
 }(A));
@@ -86,7 +86,7 @@ var C = (function (_super) {
     function C() {
         var _this;
         _this = _super.call(this) || this; // No error
-        this.s = 9;
+        _this.s = 9;
         "use strict";
     }
     return C;
@@ -95,7 +95,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        this.s = 9;
+        _this.s = 9;
         var x = 1; // Error
         _this = _super.call(this) || this;
         "use strict";
diff --git a/tests/baselines/reference/superAccess2.js b/tests/baselines/reference/superAccess2.js
index ff711ca8d75ac..807347e1d1653 100644
--- a/tests/baselines/reference/superAccess2.js
+++ b/tests/baselines/reference/superAccess2.js
@@ -46,8 +46,8 @@ var Q = (function (_super) {
         if (zz === void 0) { zz = _super.; }
         if (zzz === void 0) { zzz = function () { return _super.; }; }
         _this = _super.call(this) || this;
-        this.z = z;
-        this.xx = _super.prototype.;
+        _this.z = z;
+        _this.xx = _super.prototype.;
     }
     Q.prototype.foo = function (zz) {
         if (zz === void 0) { zz = _super.prototype.; }
diff --git a/tests/baselines/reference/superCallArgsMustMatch.js b/tests/baselines/reference/superCallArgsMustMatch.js
index 3dec9369dd427..770cb0bf79f8b 100644
--- a/tests/baselines/reference/superCallArgsMustMatch.js
+++ b/tests/baselines/reference/superCallArgsMustMatch.js
@@ -44,7 +44,7 @@ var T6 = (function (_super) {
         // Should error; base constructor has type T for first arg,
         // which is instantiated with 'number' in the extends clause
         _this = _super.call(this, "hi") || this;
-        var x = this.foo;
+        var x = _this.foo;
     }
     return T6;
 }(T5));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing1.js b/tests/baselines/reference/superCallBeforeThisAccessing1.js
index e70dde9fd8e13..6af4482f37196 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing1.js
@@ -33,7 +33,7 @@ var D = (function (_super) {
         var _this;
         _this = _super.call(this, i) || this;
         var s = {
-            t: this._t
+            t: _this._t
         };
         var i = Factory.create(s);
     }
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing3.js b/tests/baselines/reference/superCallBeforeThisAccessing3.js
index 1f4c81149133a..f77cb96417967 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing3.js
@@ -30,7 +30,7 @@ var D = (function (_super) {
         var _this;
         var x = function () { _this._t; };
         x(); // no error; we only check super is called before this when the container is a constructor
-        this._t; // error
+        _this._t; // error
         _this = _super.call(this, undefined) || this;
     }
     return D;
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing4.js b/tests/baselines/reference/superCallBeforeThisAccessing4.js
index 2645eaa9795dc..c147b0d84ccb7 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing4.js
@@ -25,7 +25,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        this._t;
+        _this._t;
         _this = _super.call(this) || this;
     }
     return D;
@@ -35,7 +35,7 @@ var E = (function (_super) {
     function E() {
         var _this;
         _this = _super.call(this) || this;
-        this._t;
+        _this._t;
     }
     return E;
 }(null));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing5.js b/tests/baselines/reference/superCallBeforeThisAccessing5.js
index df345ec5c26b8..8fff8068ec00b 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing5.js
@@ -17,7 +17,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        this._t; // No error
+        _this._t; // No error
     }
     return D;
 }(null));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index d4e8c97955262..843a1d3b2cf0c 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -25,7 +25,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        _this = _super.call(this, this) || this;
+        _this = _super.call(this, _this) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing7.js b/tests/baselines/reference/superCallBeforeThisAccessing7.js
index f6c41b144eba4..d6ad948a08cd9 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing7.js
@@ -29,7 +29,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         var x = {
-            j: this._t
+            j: _this._t
         };
         _this = _super.call(this, undefined) || this;
     }
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing8.js b/tests/baselines/reference/superCallBeforeThisAccessing8.js
index 7d09351621a64..cbf0236c4cc3d 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing8.js
@@ -30,7 +30,7 @@ var D = (function (_super) {
         var _this;
         var x = {
             k: _this = _super.call(this, undefined) || this,
-            j: this._t
+            j: _this._t
         };
     }
     return D;
diff --git a/tests/baselines/reference/superCallInNonStaticMethod.js b/tests/baselines/reference/superCallInNonStaticMethod.js
index 6640a32be5a02..1dd120eeb5c3e 100644
--- a/tests/baselines/reference/superCallInNonStaticMethod.js
+++ b/tests/baselines/reference/superCallInNonStaticMethod.js
@@ -68,9 +68,9 @@ var Other = (function (_super) {
     function Other() {
         var _this;
         _this = _super.call(this) || this;
-        this.propertyInitializer = _super.prototype.instanceMethod.call(this);
-        this.functionProperty = function () { _super.prototype.instanceMethod.call(_this); };
-        _super.prototype.instanceMethod.call(this);
+        _this.propertyInitializer = _super.prototype.instanceMethod.call(_this);
+        _this.functionProperty = function () { _super.prototype.instanceMethod.call(_this); };
+        _super.prototype.instanceMethod.call(_this);
     }
     // in instance method
     Other.prototype.instanceMethod = function () {
diff --git a/tests/baselines/reference/superCallOutsideConstructor.js b/tests/baselines/reference/superCallOutsideConstructor.js
index fd91de4cc8e1d..774dde7234098 100644
--- a/tests/baselines/reference/superCallOutsideConstructor.js
+++ b/tests/baselines/reference/superCallOutsideConstructor.js
@@ -39,9 +39,9 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
-        this.x = _this = _super.call(this) || this;
+        _this.x = _this = _super.call(this) || this;
         var y = function () {
-            _this = _super.call(_this) || _this;
+            _this = _super.call(this) || this;
         };
         var y2 = function () {
             _this = _super.call(this) || this;
diff --git a/tests/baselines/reference/superCallParameterContextualTyping3.js b/tests/baselines/reference/superCallParameterContextualTyping3.js
index cfa3fd1c07431..d77df52ddd6cc 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping3.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping3.js
@@ -57,7 +57,7 @@ var C = (function (_super) {
         }) || this;
         // Should be okay.
         // 'p' should have type 'string'.
-        _super.prototype.foo.call(this, {
+        _super.prototype.foo.call(_this, {
             method: function (p) {
                 p.length;
             }
diff --git a/tests/baselines/reference/superCalls.js b/tests/baselines/reference/superCalls.js
index 96b0061f47e90..33127da64375d 100644
--- a/tests/baselines/reference/superCalls.js
+++ b/tests/baselines/reference/superCalls.js
@@ -49,7 +49,7 @@ var Derived = (function (_super) {
     function Derived(q) {
         var _this;
         _this = _super.call(this, '') || this;
-        this.q = q;
+        _this.q = q;
         //type of super call expression is void
         var p = _this = _super.call(this, '') || this;
         var p = v();
diff --git a/tests/baselines/reference/superErrors.js b/tests/baselines/reference/superErrors.js
index f962876a391c0..2e68370fc32a4 100644
--- a/tests/baselines/reference/superErrors.js
+++ b/tests/baselines/reference/superErrors.js
@@ -78,7 +78,7 @@ var RegisteredUser = (function (_super) {
     function RegisteredUser() {
         var _this;
         _this = _super.call(this) || this;
-        this.name = "Frank";
+        _this.name = "Frank";
         // super call in an inner function in a constructor
         function inner() {
             _super.sayHello.call(this);
diff --git a/tests/baselines/reference/superInConstructorParam1.js b/tests/baselines/reference/superInConstructorParam1.js
index ab1744929a995..56e40b65e1092 100644
--- a/tests/baselines/reference/superInConstructorParam1.js
+++ b/tests/baselines/reference/superInConstructorParam1.js
@@ -28,7 +28,7 @@ var C = (function (_super) {
     __extends(C, _super);
     function C(a) {
         var _this;
-        if (a === void 0) { a = _super.foo.call(this); }
+        if (a === void 0) { a = _super.foo.call(_this); }
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/superInLambdas.js b/tests/baselines/reference/superInLambdas.js
index f2c84cb7e64ba..5a1f48f382645 100644
--- a/tests/baselines/reference/superInLambdas.js
+++ b/tests/baselines/reference/superInLambdas.js
@@ -87,9 +87,9 @@ var RegisteredUser = (function (_super) {
     function RegisteredUser() {
         var _this;
         _this = _super.call(this) || this;
-        this.name = "Frank";
+        _this.name = "Frank";
         // super call in a constructor
-        _super.prototype.sayHello.call(this);
+        _super.prototype.sayHello.call(_this);
         // super call in a lambda in a constructor 
         var x = function () { return _super.prototype.sayHello.call(_this); };
     }
@@ -107,7 +107,7 @@ var RegisteredUser2 = (function (_super) {
     function RegisteredUser2() {
         var _this;
         _this = _super.call(this) || this;
-        this.name = "Joe";
+        _this.name = "Joe";
         // super call in a nested lambda in a constructor 
         var x = function () { return function () { return function () { return _super.prototype.sayHello.call(_this); }; }; };
     }
@@ -123,7 +123,7 @@ var RegisteredUser3 = (function (_super) {
     function RegisteredUser3() {
         var _this;
         _this = _super.call(this) || this;
-        this.name = "Sam";
+        _this.name = "Sam";
         // super property in a nested lambda in a constructor 
         var superName = function () { return function () { return function () { return _super.prototype.name; }; }; };
     }
@@ -139,7 +139,7 @@ var RegisteredUser4 = (function (_super) {
     function RegisteredUser4() {
         var _this;
         _this = _super.call(this) || this;
-        this.name = "Mark";
+        _this.name = "Mark";
         // super in a nested lambda in a constructor 
         var x = function () { return function () { return _super.prototype.; }; };
     }
diff --git a/tests/baselines/reference/superPropertyAccess1.js b/tests/baselines/reference/superPropertyAccess1.js
index 86f059a2fb22b..c986580657033 100644
--- a/tests/baselines/reference/superPropertyAccess1.js
+++ b/tests/baselines/reference/superPropertyAccess1.js
@@ -52,7 +52,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
-        _super.prototype.bar.call(this);
+        _super.prototype.bar.call(_this);
         _super.prototype.x; // error
     }
     D.prototype.foo = function () {
diff --git a/tests/baselines/reference/superPropertyAccess2.js b/tests/baselines/reference/superPropertyAccess2.js
index be0c44b40818e..df6e08177cb3f 100644
--- a/tests/baselines/reference/superPropertyAccess2.js
+++ b/tests/baselines/reference/superPropertyAccess2.js
@@ -52,7 +52,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
-        _super.prototype.bar.call(this); // error
+        _super.prototype.bar.call(_this); // error
         _super.prototype.x; // error
     }
     D.foo = function () {
diff --git a/tests/baselines/reference/superPropertyAccessNoError.js b/tests/baselines/reference/superPropertyAccessNoError.js
index f7663eab6e057..d8dda26288c0e 100644
--- a/tests/baselines/reference/superPropertyAccessNoError.js
+++ b/tests/baselines/reference/superPropertyAccessNoError.js
@@ -101,7 +101,7 @@ var SomeDerivedClass = (function (_super) {
     function SomeDerivedClass() {
         var _this;
         _this = _super.call(this) || this;
-        var x = _super.prototype.func.call(this);
+        var x = _super.prototype.func.call(_this);
         var x;
     }
     SomeDerivedClass.prototype.fn = function () {
diff --git a/tests/baselines/reference/superPropertyAccess_ES5.js b/tests/baselines/reference/superPropertyAccess_ES5.js
index 14492c2788ab1..1d2ab4c2a3f1b 100644
--- a/tests/baselines/reference/superPropertyAccess_ES5.js
+++ b/tests/baselines/reference/superPropertyAccess_ES5.js
@@ -51,7 +51,7 @@ var MyDerived = (function (_super) {
     function MyDerived() {
         var _this;
         _this = _super.call(this) || this;
-        var f1 = _super.prototype.getValue.call(this);
+        var f1 = _super.prototype.getValue.call(_this);
         var f2 = _super.prototype.value;
     }
     return MyDerived;
diff --git a/tests/baselines/reference/superWithTypeArgument.js b/tests/baselines/reference/superWithTypeArgument.js
index a4acd321f503f..cc46fa968969a 100644
--- a/tests/baselines/reference/superWithTypeArgument.js
+++ b/tests/baselines/reference/superWithTypeArgument.js
@@ -24,7 +24,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        _super.prototype..call(this);
+        _super.prototype..call(_this);
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithTypeArgument2.js b/tests/baselines/reference/superWithTypeArgument2.js
index ca399c4de78c0..4b5176bed9630 100644
--- a/tests/baselines/reference/superWithTypeArgument2.js
+++ b/tests/baselines/reference/superWithTypeArgument2.js
@@ -24,7 +24,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D(x) {
         var _this;
-        _super.prototype..call(this, x);
+        _super.prototype..call(_this, x);
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithTypeArgument3.js b/tests/baselines/reference/superWithTypeArgument3.js
index 5a124586d0cfb..aa70803de4dfe 100644
--- a/tests/baselines/reference/superWithTypeArgument3.js
+++ b/tests/baselines/reference/superWithTypeArgument3.js
@@ -29,7 +29,7 @@ var D = (function (_super) {
     __extends(D, _super);
     function D() {
         var _this;
-        _super.prototype..call(this);
+        _super.prototype..call(_this);
     }
     D.prototype.bar = function () {
         _super.prototype.bar.call(this, null);
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 2a86b144ae51d..218ebfb168672 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -71,7 +71,7 @@ var ClassWithNoInitializer = (function (_super) {
     //'this' in optional super call
     function ClassWithNoInitializer() {
         var _this;
-        _this = _super.call(this, this) || this; // Error
+        _this = _super.call(this, _this) || this; // Error
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -80,8 +80,8 @@ var ClassWithInitializer = (function (_super) {
     //'this' in required super call
     function ClassWithInitializer() {
         var _this;
-        _this = _super.call(this, this) || this; // Error
-        this.t = 4;
+        _this = _super.call(this, _this) || this; // Error
+        _this.t = 4;
     }
     return ClassWithInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index 3748ebaa42f6b..c14f71ac0b68d 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -72,7 +72,7 @@ var ClassWithNoInitializer = (function (_super) {
     //'this' in optional super call
     function ClassWithNoInitializer() {
         var _this;
-        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
+        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -81,8 +81,8 @@ var ClassWithInitializer = (function (_super) {
     //'this' in required super call
     function ClassWithInitializer() {
         var _this;
-        _this = _super.call(this, this) || this; // Error
-        this.t = 4;
+        _this = _super.call(this, _this) || this; // Error
+        _this.t = 4;
     }
     return ClassWithInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index 91e71522e4df8..cf64eebced18e 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -37,7 +37,7 @@ var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
         var _this;
-        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
+        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
     }
     return Foo;
 }(Base));
@@ -45,8 +45,8 @@ var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
         var _this;
-        _this = _super.call(this, this) || this; // error
-        this.p = 0;
+        _this = _super.call(this, _this) || this; // error
+        _this.p = 0;
     }
     return Foo2;
 }(Base));
@@ -54,8 +54,8 @@ var Foo3 = (function (_super) {
     __extends(Foo3, _super);
     function Foo3(p) {
         var _this;
-        _this = _super.call(this, this) || this; // error
-        this.p = p;
+        _this = _super.call(this, _this) || this; // error
+        _this.p = p;
     }
     return Foo3;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall1.js b/tests/baselines/reference/thisInSuperCall1.js
index 8e68c47eb2717..eba933d98933a 100644
--- a/tests/baselines/reference/thisInSuperCall1.js
+++ b/tests/baselines/reference/thisInSuperCall1.js
@@ -25,8 +25,8 @@ var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x) {
         var _this;
-        _this = _super.call(this, this) || this;
-        this.x = x;
+        _this = _super.call(this, _this) || this;
+        _this.x = x;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index 6771f15c99b5c..ed6baabb4086e 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -34,7 +34,7 @@ var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
         var _this;
-        _this = _super.call(this, this) || this; // error: "super" has to be called before "this" accessing
+        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
     }
     return Foo;
 }(Base));
@@ -42,8 +42,8 @@ var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
         var _this;
-        _this = _super.call(this, this) || this; // error
-        this.x = 0;
+        _this = _super.call(this, _this) || this; // error
+        _this.x = 0;
     }
     return Foo2;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall3.js b/tests/baselines/reference/thisInSuperCall3.js
index 4b6c1747d17df..d705d5fa7e09c 100644
--- a/tests/baselines/reference/thisInSuperCall3.js
+++ b/tests/baselines/reference/thisInSuperCall3.js
@@ -27,8 +27,8 @@ var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
         var _this;
-        _this = _super.call(this, this) || this;
-        this.x = 0;
+        _this = _super.call(this, _this) || this;
+        _this.x = 0;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/tsxDynamicTagName5.js b/tests/baselines/reference/tsxDynamicTagName5.js
index 9a64ef6cee6c1..76b79dbc7dccc 100644
--- a/tests/baselines/reference/tsxDynamicTagName5.js
+++ b/tests/baselines/reference/tsxDynamicTagName5.js
@@ -32,7 +32,7 @@ var Text = (function (_super) {
     function Text() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this._tagName = 'div';
+        _this._tagName = 'div';
     }
     Text.prototype.render = function () {
         return (<this._tagName />);
diff --git a/tests/baselines/reference/tsxDynamicTagName7.js b/tests/baselines/reference/tsxDynamicTagName7.js
index 30500b37ce5c0..c55ceb100eab5 100644
--- a/tests/baselines/reference/tsxDynamicTagName7.js
+++ b/tests/baselines/reference/tsxDynamicTagName7.js
@@ -32,7 +32,7 @@ var Text = (function (_super) {
     function Text() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this._tagName = 'div';
+        _this._tagName = 'div';
     }
     Text.prototype.render = function () {
         return (<this /> // this should be an error
diff --git a/tests/baselines/reference/tsxDynamicTagName8.js b/tests/baselines/reference/tsxDynamicTagName8.js
index a6cf3bb45b888..57ce2becbad13 100644
--- a/tests/baselines/reference/tsxDynamicTagName8.js
+++ b/tests/baselines/reference/tsxDynamicTagName8.js
@@ -32,7 +32,7 @@ var Text = (function (_super) {
     function Text() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this._tagName = 'div';
+        _this._tagName = 'div';
     }
     Text.prototype.render = function () {
         return (<this._tagName> Hello world </this._tagName>);
diff --git a/tests/baselines/reference/tsxDynamicTagName9.js b/tests/baselines/reference/tsxDynamicTagName9.js
index aa63e614d1547..1bc14eb32eec3 100644
--- a/tests/baselines/reference/tsxDynamicTagName9.js
+++ b/tests/baselines/reference/tsxDynamicTagName9.js
@@ -32,7 +32,7 @@ var Text = (function (_super) {
     function Text() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this._tagName = 'div';
+        _this._tagName = 'div';
     }
     Text.prototype.render = function () {
         return (<this._tagName> Hello world </this._tagName>);
diff --git a/tests/baselines/reference/typeGuardOfFormThisMember.js b/tests/baselines/reference/typeGuardOfFormThisMember.js
index 63c79ce4c9192..fefb1e7ff3832 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMember.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMember.js
@@ -120,7 +120,7 @@ var Test;
         function File(path, content) {
             var _this;
             _this = _super.call(this, path) || this;
-            this.content = content;
+            _this.content = content;
         }
         return File;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
index 5c28921a6a7a3..ed53a308808c8 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
@@ -70,7 +70,7 @@ var Test;
         function File(path, content) {
             var _this;
             _this = _super.call(this, path) || this;
-            this.content = content;
+            _this.content = content;
         }
         return File;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeRelationships.js b/tests/baselines/reference/typeRelationships.js
index 43c1f7ee14638..87f0f60c53f30 100644
--- a/tests/baselines/reference/typeRelationships.js
+++ b/tests/baselines/reference/typeRelationships.js
@@ -74,10 +74,10 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.self1 = this;
-        this.self2 = this.self;
-        this.self3 = this.foo();
-        this.d = new D();
+        _this.self1 = _this;
+        _this.self2 = _this.self;
+        _this.self3 = _this.foo();
+        _this.d = new D();
     }
     D.prototype.bar = function () {
         this.self = this.self1;
diff --git a/tests/baselines/reference/unspecializedConstraints.js b/tests/baselines/reference/unspecializedConstraints.js
index b2ea2cac9ebcf..06d2c4bd6a51b 100644
--- a/tests/baselines/reference/unspecializedConstraints.js
+++ b/tests/baselines/reference/unspecializedConstraints.js
@@ -236,9 +236,9 @@ var ts;
         function Property(name, type, flags) {
             var _this;
             _this = _super.call(this) || this;
-            this.name = name;
-            this.type = type;
-            this.flags = flags;
+            _this.name = name;
+            _this.type = type;
+            _this.flags = flags;
         }
         Property.prototype.equals = function (other) {
             return this.name === other.name &&
@@ -257,9 +257,9 @@ var ts;
         function Signature(typeParameters, parameters, returnType) {
             var _this;
             _this = _super.call(this) || this;
-            this.typeParameters = typeParameters;
-            this.parameters = parameters;
-            this.returnType = returnType;
+            _this.typeParameters = typeParameters;
+            _this.parameters = parameters;
+            _this.returnType = returnType;
         }
         Signature.prototype.equalsNoReturn = function (other) {
             return this.parameters.length === other.parameters.length &&
@@ -278,9 +278,9 @@ var ts;
         function Parameter(name, type, flags) {
             var _this;
             _this = _super.call(this) || this;
-            this.name = name;
-            this.type = type;
-            this.flags = flags;
+            _this.name = name;
+            _this.type = type;
+            _this.flags = flags;
         }
         Parameter.prototype.equals = function (other) {
             return this.name === other.name &&
diff --git a/tests/baselines/reference/varArgsOnConstructorTypes.js b/tests/baselines/reference/varArgsOnConstructorTypes.js
index e892cc28a3c8f..04eaa58a1968e 100644
--- a/tests/baselines/reference/varArgsOnConstructorTypes.js
+++ b/tests/baselines/reference/varArgsOnConstructorTypes.js
@@ -43,8 +43,8 @@ define(["require", "exports"], function (require, exports) {
         function B(element, url) {
             var _this;
             _this = _super.call(this, element) || this;
-            this.p1 = element;
-            this.p2 = url;
+            _this.p1 = element;
+            _this.p2 = url;
         }
         return B;
     }(A));

From 9c6e148d6e4d4e5f5d33127209343e58ef701f61 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 00:12:32 -0700
Subject: [PATCH 05/39] Accepted baselines for sourcemap test.

---
 ...sWithDefaultConstructorAndExtendsClause.js |  4 +-
 ...hDefaultConstructorAndExtendsClause.js.map |  2 +-
 ...tConstructorAndExtendsClause.sourcemap.txt | 50 +++++++++----------
 3 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
index ea71fbc20c0d6..29da6d52a3837 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
@@ -23,8 +23,8 @@ var Greeter = (function (_super) {
     function Greeter() {
         var _this;
         _this = _super.apply(this, arguments) || this;
-        this.a = 10;
-        this.nameA = "Ten";
+        _this.a = 10;
+        _this.nameA = "Ten";
     }
     return Greeter;
 }(AbstractGreeter));
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
index e36f2eaaf8ece..3a75f3d3b6696 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
@@ -1,2 +1,2 @@
 //// [sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map]
-{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,MAAC,GAAG,EAAE,CAAC;QACP,UAAK,GAAG,KAAK,CAAC;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
+{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,OAAC,GAAG,EAAE,CAAC;QACP,WAAK,GAAG,KAAK,CAAC;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
index 3da1d42edcde7..7c05c1b4d849d 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
@@ -94,41 +94,41 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 2 >Emitted(14, 19) Source(7, 2) + SourceIndex(0)
 ---
 >>>        _this = _super.apply(this, arguments) || this;
->>>        this.a = 10;
+>>>        _this.a = 10;
 1->^^^^^^^^
-2 >        ^^^^^^
-3 >              ^^^
-4 >                 ^^
-5 >                   ^
-6 >                    ^^^^^^^^->
+2 >        ^^^^^^^
+3 >               ^^^
+4 >                  ^^
+5 >                    ^
+6 >                     ^^^^^^^^->
 1->
 2 >        a
-3 >               = 
-4 >                 10
-5 >                   ;
+3 >                = 
+4 >                  10
+5 >                    ;
 1->Emitted(16, 9) Source(5, 12) + SourceIndex(0)
-2 >Emitted(16, 15) Source(5, 13) + SourceIndex(0)
-3 >Emitted(16, 18) Source(5, 16) + SourceIndex(0)
-4 >Emitted(16, 20) Source(5, 18) + SourceIndex(0)
-5 >Emitted(16, 21) Source(5, 19) + SourceIndex(0)
+2 >Emitted(16, 16) Source(5, 13) + SourceIndex(0)
+3 >Emitted(16, 19) Source(5, 16) + SourceIndex(0)
+4 >Emitted(16, 21) Source(5, 18) + SourceIndex(0)
+5 >Emitted(16, 22) Source(5, 19) + SourceIndex(0)
 ---
->>>        this.nameA = "Ten";
+>>>        _this.nameA = "Ten";
 1->^^^^^^^^
-2 >        ^^^^^^^^^^
-3 >                  ^^^
-4 >                     ^^^^^
-5 >                          ^
+2 >        ^^^^^^^^^^^
+3 >                   ^^^
+4 >                      ^^^^^
+5 >                           ^
 1->
   >    public 
 2 >        nameA
-3 >                   = 
-4 >                     "Ten"
-5 >                          ;
+3 >                    = 
+4 >                      "Ten"
+5 >                           ;
 1->Emitted(17, 9) Source(6, 12) + SourceIndex(0)
-2 >Emitted(17, 19) Source(6, 17) + SourceIndex(0)
-3 >Emitted(17, 22) Source(6, 20) + SourceIndex(0)
-4 >Emitted(17, 27) Source(6, 25) + SourceIndex(0)
-5 >Emitted(17, 28) Source(6, 26) + SourceIndex(0)
+2 >Emitted(17, 20) Source(6, 17) + SourceIndex(0)
+3 >Emitted(17, 23) Source(6, 20) + SourceIndex(0)
+4 >Emitted(17, 28) Source(6, 25) + SourceIndex(0)
+5 >Emitted(17, 29) Source(6, 26) + SourceIndex(0)
 ---
 >>>    }
 1 >^^^^

From cd5e76b23c6ffcb7c57ba8cf31660eb4826a86a8 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 00:30:15 -0700
Subject: [PATCH 06/39] Always tack on a return statement for '_this' in
 derived classes.

---
 src/compiler/transformers/es6.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 5dd2b154c01f5..886ee1b8e40d8 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -790,7 +790,7 @@ namespace ts {
                 const body = saveStateAndInvoke(constructor, hasSynthesizedSuper ? transformConstructorBodyWithSynthesizedSuper : transformConstructorBodyWithoutSynthesizedSuper);
                 addRange(statements, body);
             }
-            if (constructor ? hasSynthesizedSuper : extendsClauseElement) {
+            if (extendsClauseElement) {
                 statements.push(
                     createReturn(
                         createIdentifier("_this")

From 30ec599c13d99378d8f1a0c27d783e25ed10723d Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 11:52:13 -0700
Subject: [PATCH 07/39] Accepted baselines.

---
 tests/baselines/reference/abstractProperty.js |  1 +
 .../reference/abstractPropertyNegative.js     |  3 ++
 .../accessOverriddenBaseClassMember1.js       |  1 +
 ...aliasUsageInTypeArgumentOfExtendsClause.js |  1 +
 .../reference/arrowFunctionContexts.js        |  2 +
 .../reference/assignmentLHSIsValue.js         |  1 +
 tests/baselines/reference/autolift4.js        |  1 +
 tests/baselines/reference/baseCheck.js        |  5 ++
 tests/baselines/reference/bases.js            |  1 +
 .../reference/bestCommonTypeOfTuple2.js       |  1 +
 tests/baselines/reference/callWithSpread.js   |  1 +
 .../reference/captureThisInSuperCall.js       |  1 +
 .../reference/checkForObjectTooStrict.js      |  2 +
 .../checkSuperCallBeforeThisAccessing1.js     |  1 +
 .../checkSuperCallBeforeThisAccessing2.js     |  1 +
 .../checkSuperCallBeforeThisAccessing3.js     |  1 +
 .../checkSuperCallBeforeThisAccessing4.js     |  1 +
 .../checkSuperCallBeforeThisAccessing5.js     |  1 +
 .../checkSuperCallBeforeThisAccessing6.js     |  1 +
 .../checkSuperCallBeforeThisAccessing7.js     |  1 +
 .../checkSuperCallBeforeThisAccessing8.js     |  1 +
 .../classConstructorAccessibility2.js         |  3 ++
 ...classConstructorParametersAccessibility.js |  1 +
 ...lassConstructorParametersAccessibility2.js |  1 +
 ...lassConstructorParametersAccessibility3.js |  1 +
 tests/baselines/reference/classExpression3.js |  2 +
 .../reference/classExtendingClassLikeType.js  |  3 ++
 tests/baselines/reference/classExtendsNull.js |  2 +
 .../reference/classSideInheritance2.js        |  1 +
 .../reference/classSideInheritance3.js        |  2 +
 tests/baselines/reference/classUpdateTests.js |  8 ++++
 ...isionSuperAndLocalFunctionInConstructor.js |  2 +
 ...ollisionSuperAndLocalFunctionInProperty.js |  1 +
 .../collisionSuperAndLocalVarInConstructor.js |  2 +
 .../collisionSuperAndLocalVarInProperty.js    |  1 +
 .../reference/collisionSuperAndParameter.js   |  2 +
 ...perAndPropertyNameAsConstuctorParameter.js |  4 ++
 .../reference/commentsInheritance.js          |  1 +
 .../reference/compoundAssignmentLHSIsValue.js |  1 +
 ...poundExponentiationAssignmentLHSIsValue.js |  1 +
 .../reference/computedPropertyNames28_ES5.js  |  1 +
 .../reference/computedPropertyNames30_ES5.js  |  1 +
 tests/baselines/reference/constructorArgs.js  |  1 +
 ...ctorFunctionTypeIsAssignableToBaseType2.js |  2 +
 .../reference/constructorOverloads2.js        |  1 +
 .../reference/constructorOverloads3.js        |  1 +
 .../reference/declFileGenericType2.js         |  2 +
 .../reference/decoratorOnClassConstructor2.js |  1 +
 .../reference/decoratorOnClassConstructor3.js |  1 +
 ...derivedClassConstructorWithoutSuperCall.js |  4 ++
 .../derivedClassOverridesPrivateFunction1.js  |  1 +
 .../derivedClassOverridesProtectedMembers.js  |  1 +
 .../derivedClassOverridesProtectedMembers2.js |  1 +
 .../derivedClassOverridesProtectedMembers3.js | 10 ++++
 .../derivedClassOverridesPublicMembers.js     |  1 +
 .../derivedClassParameterProperties.js        | 10 ++++
 ...dClassSuperCallsInNonConstructorMembers.js |  1 +
 .../derivedClassSuperCallsWithThisArg.js      |  4 ++
 .../derivedClassWithoutExplicitConstructor.js |  2 +
 ...derivedClassWithoutExplicitConstructor2.js |  2 +
 ...derivedClassWithoutExplicitConstructor3.js |  4 ++
 .../destructuringParameterDeclaration5.js     |  2 +
 ...BeforeEmitParameterPropertyDeclaration1.js |  1 +
 ...SuperCallBeforeEmitPropertyDeclaration1.js |  1 +
 ...arationAndParameterPropertyDeclaration1.js |  1 +
 tests/baselines/reference/errorSuperCalls.js  |  2 +
 .../reference/errorSuperPropertyAccess.js     |  2 +
 .../reference/es6ClassSuperCodegenBug.js      |  1 +
 tests/baselines/reference/es6ClassTest.js     |  1 +
 tests/baselines/reference/es6ClassTest2.js    |  1 +
 ...cClassPropertyInheritanceSpecialization.js |  1 +
 ...genericConstraintOnExtendedBuiltinTypes.js |  1 +
 ...enericConstraintOnExtendedBuiltinTypes2.js |  1 +
 ...ericRecursiveImplicitConstructorErrors3.js |  1 +
 .../reference/genericTypeConstraints.js       |  1 +
 .../illegalSuperCallsInConstructor.js         |  1 +
 .../interfaceExtendsClassWithPrivate2.js      |  2 +
 tests/baselines/reference/lift.js             |  1 +
 .../missingPropertiesOfClassExpression.js     |  1 +
 ...objectCreationOfElementAccessExpression.js |  6 +++
 tests/baselines/reference/optionalMethods.js  |  1 +
 .../reference/optionalParamArgsTest.js        |  1 +
 .../reference/optionalParameterProperty.js    |  1 +
 .../overloadOnConstConstraintChecks4.js       |  1 +
 tests/baselines/reference/parserAstSpans1.js  |  2 +
 .../baselines/reference/parserRealSource10.js |  6 +++
 .../baselines/reference/parserRealSource11.js | 48 +++++++++++++++++++
 tests/baselines/reference/parserharness.js    |  3 ++
 .../privateInstanceMemberAccessibility.js     |  1 +
 .../privateStaticMemberAccessibility.js       |  1 +
 .../readonlyConstructorAssignment.js          |  3 ++
 .../reference/returnInConstructor1.js         |  2 +
 tests/baselines/reference/scopeTests.js       |  1 +
 ...sWithDefaultConstructorAndExtendsClause.js |  1 +
 ...hDefaultConstructorAndExtendsClause.js.map |  2 +-
 ...tConstructorAndExtendsClause.sourcemap.txt | 21 ++++----
 .../baselines/reference/staticInheritance.js  |  1 +
 tests/baselines/reference/staticPropSuper.js  |  4 ++
 .../reference/strictModeInConstructor.js      |  6 +++
 tests/baselines/reference/superAccess2.js     |  1 +
 .../reference/superCallArgsMustMatch.js       |  1 +
 .../reference/superCallAssignResult.js        |  1 +
 .../superCallBeforeThisAccessing1.js          |  1 +
 .../superCallBeforeThisAccessing2.js          |  1 +
 .../superCallBeforeThisAccessing3.js          |  1 +
 .../superCallBeforeThisAccessing4.js          |  2 +
 .../superCallBeforeThisAccessing5.js          |  1 +
 .../superCallBeforeThisAccessing6.js          |  1 +
 .../superCallBeforeThisAccessing7.js          |  1 +
 .../superCallBeforeThisAccessing8.js          |  1 +
 ...allFromClassThatDerivesFromGenericType1.js |  1 +
 ...allFromClassThatDerivesFromGenericType2.js |  1 +
 ...eButWithIncorrectNumberOfTypeArguments1.js |  1 +
 ...sFromGenericTypeButWithNoTypeArguments1.js |  1 +
 ...ivesNonGenericTypeButWithTypeArguments1.js |  1 +
 .../reference/superCallInNonStaticMethod.js   |  1 +
 .../superCallInsideClassDeclaration.js        |  2 +
 .../superCallInsideClassExpression.js         |  2 +
 .../superCallInsideObjectLiteralExpression.js |  1 +
 .../reference/superCallOutsideConstructor.js  |  1 +
 .../superCallParameterContextualTyping1.js    |  1 +
 .../superCallParameterContextualTyping2.js    |  1 +
 .../superCallParameterContextualTyping3.js    |  1 +
 tests/baselines/reference/superCalls.js       |  2 +
 .../reference/superCallsInConstructor.js      |  1 +
 tests/baselines/reference/superErrors.js      |  1 +
 .../reference/superInConstructorParam1.js     |  1 +
 tests/baselines/reference/superInLambdas.js   |  4 ++
 tests/baselines/reference/superNewCall1.js    |  1 +
 .../reference/superPropertyAccess1.js         |  1 +
 .../reference/superPropertyAccess2.js         |  1 +
 .../reference/superPropertyAccessNoError.js   |  1 +
 .../reference/superPropertyAccess_ES5.js      |  1 +
 .../superWithGenericSpecialization.js         |  1 +
 .../baselines/reference/superWithGenerics.js  |  1 +
 .../reference/superWithTypeArgument.js        |  1 +
 .../reference/superWithTypeArgument2.js       |  1 +
 .../reference/superWithTypeArgument3.js       |  1 +
 .../reference/targetTypeBaseCalls.js          |  1 +
 .../reference/thisInInvalidContexts.js        |  2 +
 .../thisInInvalidContextsExternalModule.js    |  2 +
 tests/baselines/reference/thisInSuperCall.js  |  3 ++
 tests/baselines/reference/thisInSuperCall1.js |  1 +
 tests/baselines/reference/thisInSuperCall2.js |  2 +
 tests/baselines/reference/thisInSuperCall3.js |  1 +
 .../baselines/reference/tsxDynamicTagName5.js |  1 +
 .../baselines/reference/tsxDynamicTagName7.js |  1 +
 .../baselines/reference/tsxDynamicTagName8.js |  1 +
 .../baselines/reference/tsxDynamicTagName9.js |  1 +
 .../reference/typeGuardOfFormThisMember.js    |  1 +
 .../typeGuardOfFormThisMemberErrors.js        |  1 +
 tests/baselines/reference/typeOfSuperCall.js  |  1 +
 .../baselines/reference/typeRelationships.js  |  1 +
 tests/baselines/reference/unknownSymbols1.js  |  1 +
 .../reference/unspecializedConstraints.js     |  3 ++
 .../reference/validUseOfThisInSuper.js        |  1 +
 .../reference/varArgsOnConstructorTypes.js    |  1 +
 157 files changed, 315 insertions(+), 11 deletions(-)

diff --git a/tests/baselines/reference/abstractProperty.js b/tests/baselines/reference/abstractProperty.js
index d9bfd5eb05f6f..292213ead5398 100644
--- a/tests/baselines/reference/abstractProperty.js
+++ b/tests/baselines/reference/abstractProperty.js
@@ -39,6 +39,7 @@ var C = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.raw = "edge";
         _this.ro = "readonly please";
+        return _this;
     }
     Object.defineProperty(C.prototype, "prop", {
         get: function () { return "foo"; },
diff --git a/tests/baselines/reference/abstractPropertyNegative.js b/tests/baselines/reference/abstractPropertyNegative.js
index e94d9492fdb81..28ada310ef426 100644
--- a/tests/baselines/reference/abstractPropertyNegative.js
+++ b/tests/baselines/reference/abstractPropertyNegative.js
@@ -60,6 +60,7 @@ var C = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.ro = "readonly please";
+        return _this;
     }
     Object.defineProperty(C.prototype, "concreteWithNoBody", {
         get: function () { },
@@ -81,6 +82,7 @@ var WrongTypePropertyImpl = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.num = "nope, wrong";
+        return _this;
     }
     return WrongTypePropertyImpl;
 }(WrongTypeProperty));
@@ -108,6 +110,7 @@ var WrongTypeAccessorImpl2 = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.num = "nope, wrong";
+        return _this;
     }
     return WrongTypeAccessorImpl2;
 }(WrongTypeAccessor));
diff --git a/tests/baselines/reference/accessOverriddenBaseClassMember1.js b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
index b4c269b1e3bae..65431a2f77837 100644
--- a/tests/baselines/reference/accessOverriddenBaseClassMember1.js
+++ b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
@@ -37,6 +37,7 @@ var ColoredPoint = (function (_super) {
         var _this;
         _this = _super.call(this, x, y) || this;
         _this.color = color;
+        return _this;
     }
     ColoredPoint.prototype.toString = function () {
         return _super.prototype.toString.call(this) + " color=" + this.color;
diff --git a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
index 462390d28f7fb..8af9c702654c4 100644
--- a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
+++ b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
@@ -68,6 +68,7 @@ var D = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.x = moduleA;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/arrowFunctionContexts.js b/tests/baselines/reference/arrowFunctionContexts.js
index bfd49be6bbf59..660208cb0c182 100644
--- a/tests/baselines/reference/arrowFunctionContexts.js
+++ b/tests/baselines/reference/arrowFunctionContexts.js
@@ -118,6 +118,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.call(this, function () { return _this; }) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -160,6 +161,7 @@ var M2;
         function Derived() {
             var _this;
             _this = _super.call(this, function () { return _this; }) || this;
+            return _this;
         }
         return Derived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentLHSIsValue.js b/tests/baselines/reference/assignmentLHSIsValue.js
index 070c151ee51fb..52d14cbe536c3 100644
--- a/tests/baselines/reference/assignmentLHSIsValue.js
+++ b/tests/baselines/reference/assignmentLHSIsValue.js
@@ -121,6 +121,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _super.prototype. = value;
+        return _this;
     }
     Derived.prototype.foo = function () { _super.prototype. = value; };
     Derived.sfoo = function () { _super. = value; };
diff --git a/tests/baselines/reference/autolift4.js b/tests/baselines/reference/autolift4.js
index b6afd28d429aa..0638efab0b39e 100644
--- a/tests/baselines/reference/autolift4.js
+++ b/tests/baselines/reference/autolift4.js
@@ -46,6 +46,7 @@ var Point3D = (function (_super) {
         var _this;
         _this = _super.call(this, x, y) || this;
         _this.z = z;
+        return _this;
     }
     Point3D.prototype.getDist = function () {
         return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.m);
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index c3a2731b45d92..832830ae8645d 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -45,6 +45,7 @@ var ELoc = (function (_super) {
     function ELoc(x) {
         var _this;
         _this = _super.call(this, 0, x) || this;
+        return _this;
     }
     return ELoc;
 }(C));
@@ -53,6 +54,7 @@ var ELocVar = (function (_super) {
     function ELocVar(x) {
         var _this;
         _this = _super.call(this, 0, loc) || this;
+        return _this;
     }
     ELocVar.prototype.m = function () {
         var loc = 10;
@@ -65,6 +67,7 @@ var D = (function (_super) {
         var _this;
         _this = _super.call(this, _this.z) || this;
         _this.z = z;
+        return _this;
     }
     return D;
 }(C)); // too few params
@@ -74,6 +77,7 @@ var E = (function (_super) {
         var _this;
         _this = _super.call(this, 0, _this.z) || this;
         _this.z = z;
+        return _this;
     }
     return E;
 }(C));
@@ -83,6 +87,7 @@ var F = (function (_super) {
         var _this;
         _this = _super.call(this, "hello", _this.z) || this;
         _this.z = z;
+        return _this;
     }
     return F;
 }(C)); // first param type
diff --git a/tests/baselines/reference/bases.js b/tests/baselines/reference/bases.js
index ff6a3262d4565..6b73eb9556b2c 100644
--- a/tests/baselines/reference/bases.js
+++ b/tests/baselines/reference/bases.js
@@ -39,6 +39,7 @@ var C = (function (_super) {
         var _this;
         _this.x;
         any;
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/bestCommonTypeOfTuple2.js b/tests/baselines/reference/bestCommonTypeOfTuple2.js
index 34deb346cbd5c..8213733b75317 100644
--- a/tests/baselines/reference/bestCommonTypeOfTuple2.js
+++ b/tests/baselines/reference/bestCommonTypeOfTuple2.js
@@ -63,6 +63,7 @@ var D1 = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.i = "bar";
+        return _this;
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/callWithSpread.js b/tests/baselines/reference/callWithSpread.js
index 2149db744b06f..48af58edf6505 100644
--- a/tests/baselines/reference/callWithSpread.js
+++ b/tests/baselines/reference/callWithSpread.js
@@ -102,6 +102,7 @@ var D = (function (_super) {
         var _this;
         _this = _super.call(this, 1, 2) || this;
         _this = _super.apply(this, [1, 2].concat(a)) || this;
+        return _this;
     }
     D.prototype.foo = function () {
         _super.prototype.foo.call(this, 1, 2);
diff --git a/tests/baselines/reference/captureThisInSuperCall.js b/tests/baselines/reference/captureThisInSuperCall.js
index 0c36877d9dcbc..2d39722548d63 100644
--- a/tests/baselines/reference/captureThisInSuperCall.js
+++ b/tests/baselines/reference/captureThisInSuperCall.js
@@ -24,6 +24,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
+        return _this;
     }
     B.prototype.someMethod = function () { };
     return B;
diff --git a/tests/baselines/reference/checkForObjectTooStrict.js b/tests/baselines/reference/checkForObjectTooStrict.js
index 48825a01a675f..8c0cfc104d29a 100644
--- a/tests/baselines/reference/checkForObjectTooStrict.js
+++ b/tests/baselines/reference/checkForObjectTooStrict.js
@@ -51,6 +51,7 @@ var Bar = (function (_super) {
     function Bar() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return Bar;
 }(Foo.Object));
@@ -59,6 +60,7 @@ var Baz = (function (_super) {
     function Baz() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return Baz;
 }(Object));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
index 35e00c36621e6..a54f82ab9fa00 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
@@ -29,6 +29,7 @@ var Derived = (function (_super) {
         _this;
         _this.x = 10;
         var that = _this;
+        return _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
index b49c1aab7744a..95b34f27b68c7 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing2.js
@@ -29,6 +29,7 @@ var Derived = (function (_super) {
         _this = _super.call(this) || this;
         _this.x = 10;
         var that = _this;
+        return _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
index 70600bb03a953..0e882f71fdb1d 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing3.js
@@ -39,6 +39,7 @@ var Derived = (function (_super) {
         _this = _super.call(this) || this;
         _this.x = 10;
         var that = _this;
+        return _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
index 95e0062b0872d..00f2ed22fbf7b 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing4.js
@@ -47,6 +47,7 @@ var Derived = (function (_super) {
         _this = _super.call(this) || this;
         _this.x = 10;
         var that = _this;
+        return _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index 1c77b2e7c78e3..e365678ee0cad 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -27,6 +27,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.call(this, _this.x) || this;
+        return _this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
index 15fcbff4c89e9..cc8912230ab51 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing6.js
@@ -31,6 +31,7 @@ var Super = (function (_super) {
         var _this;
         (function () { return _this; }); // No Error
         _this = _super.call(this) || this;
+        return _this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
index 0cade04664dea..7ba43de005b23 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
@@ -25,6 +25,7 @@ var Super = (function (_super) {
     function Super() {
         var _this;
         _this = _super.call(this, (function () { return _this; })) || this; // No error
+        return _this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
index a280c0d6ca6f5..25a480b9b57e8 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing8.js
@@ -31,6 +31,7 @@ var Super = (function (_super) {
         var _this;
         var that = _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/classConstructorAccessibility2.js b/tests/baselines/reference/classConstructorAccessibility2.js
index 9d1ebdd9d9aef..8a81d469fb814 100644
--- a/tests/baselines/reference/classConstructorAccessibility2.js
+++ b/tests/baselines/reference/classConstructorAccessibility2.js
@@ -80,6 +80,7 @@ var DerivedA = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         _this.x = x;
+        return _this;
     }
     DerivedA.prototype.createInstance = function () { new DerivedA(5); };
     DerivedA.prototype.createBaseInstance = function () { new BaseA(6); };
@@ -92,6 +93,7 @@ var DerivedB = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         _this.x = x;
+        return _this;
     }
     DerivedB.prototype.createInstance = function () { new DerivedB(7); };
     DerivedB.prototype.createBaseInstance = function () { new BaseB(8); }; // ok
@@ -104,6 +106,7 @@ var DerivedC = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         _this.x = x;
+        return _this;
     }
     DerivedC.prototype.createInstance = function () { new DerivedC(9); };
     DerivedC.prototype.createBaseInstance = function () { new BaseC(10); }; // error
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility.js b/tests/baselines/reference/classConstructorParametersAccessibility.js
index 066c724b60f79..214815f49768c 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility.js
@@ -62,6 +62,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.call(this, p) || this;
         _this.p; // OK
+        return _this;
     }
     return Derived;
 }(C3));
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility2.js b/tests/baselines/reference/classConstructorParametersAccessibility2.js
index b80504351712d..7c714aa4c03e0 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility2.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility2.js
@@ -62,6 +62,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.call(this, p) || this;
         _this.p; // OK
+        return _this;
     }
     return Derived;
 }(C3));
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility3.js b/tests/baselines/reference/classConstructorParametersAccessibility3.js
index 9e0c0264fd954..275f3920538b5 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility3.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility3.js
@@ -32,6 +32,7 @@ var Derived = (function (_super) {
         _this = _super.call(this, p) || this;
         _this.p = p;
         _this.p; // OK
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/classExpression3.js b/tests/baselines/reference/classExpression3.js
index e0ba9c349e74d..3c53d72823353 100644
--- a/tests/baselines/reference/classExpression3.js
+++ b/tests/baselines/reference/classExpression3.js
@@ -18,6 +18,7 @@ var C = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.c = 3;
+        return _this;
     }
     return class_1;
 }((function (_super) {
@@ -26,6 +27,7 @@ var C = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.b = 2;
+        return _this;
     }
     return class_2;
 }((function () {
diff --git a/tests/baselines/reference/classExtendingClassLikeType.js b/tests/baselines/reference/classExtendingClassLikeType.js
index 2d91befc17240..32d7fff0cbd11 100644
--- a/tests/baselines/reference/classExtendingClassLikeType.js
+++ b/tests/baselines/reference/classExtendingClassLikeType.js
@@ -80,6 +80,7 @@ var D1 = (function (_super) {
         _this = _super.call(this, "abc", "def") || this;
         _this.x = "x";
         _this.y = "y";
+        return _this;
     }
     return D1;
 }(getBase()));
@@ -91,6 +92,7 @@ var D2 = (function (_super) {
         _this = _super.call(this, 10, 20) || this;
         _this.x = 1;
         _this.y = 2;
+        return _this;
     }
     return D2;
 }(getBase()));
@@ -101,6 +103,7 @@ var D3 = (function (_super) {
         _this = _super.call(this, "abc", 42) || this;
         _this.x = "x";
         _this.y = 2;
+        return _this;
     }
     return D3;
 }(getBase()));
diff --git a/tests/baselines/reference/classExtendsNull.js b/tests/baselines/reference/classExtendsNull.js
index 3ff1c92a56e4c..301dee7f705a7 100644
--- a/tests/baselines/reference/classExtendsNull.js
+++ b/tests/baselines/reference/classExtendsNull.js
@@ -24,6 +24,7 @@ var C = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         return Object.create(null);
+        return _this;
     }
     return C;
 }(null));
@@ -32,6 +33,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         return Object.create(null);
+        return _this;
     }
     return D;
 }(null));
diff --git a/tests/baselines/reference/classSideInheritance2.js b/tests/baselines/reference/classSideInheritance2.js
index c5c506d1af681..1af6b6f846c37 100644
--- a/tests/baselines/reference/classSideInheritance2.js
+++ b/tests/baselines/reference/classSideInheritance2.js
@@ -31,6 +31,7 @@ var SubText = (function (_super) {
     function SubText(text, span) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return SubText;
 }(TextBase));
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index 4751e0e8d6e56..fda7b0b0848bd 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -36,6 +36,7 @@ var B = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         _this.data = data;
+        return _this;
     }
     return B;
 }(A));
@@ -44,6 +45,7 @@ var C = (function (_super) {
     function C(x) {
         var _this;
         _this = _super.call(this, x) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index d334e1c7f66ef..2d7ecc3c1908b 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -160,6 +160,7 @@ var E = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.p1 = 0;
+        return _this;
     }
     return E;
 }(D));
@@ -167,6 +168,7 @@ var F = (function (_super) {
     __extends(F, _super);
     function F() {
         var _this;
+        return _this;
     } // ERROR - super call required
     return F;
 }(E));
@@ -176,6 +178,7 @@ var G = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this.p1 = 0;
+        return _this;
     } // NO ERROR
     return G;
 }(D));
@@ -190,6 +193,7 @@ var I = (function (_super) {
     function I() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     } // ERROR - no super call allowed
     return I;
 }(Object));
@@ -199,6 +203,7 @@ var J = (function (_super) {
         var _this;
         _this = _super.call(this) || this; // NO ERROR
         _this.p1 = p1;
+        return _this;
     }
     return J;
 }(G));
@@ -209,6 +214,7 @@ var K = (function (_super) {
         _this.p1 = p1;
         var i = 0;
         _this = _super.call(this) || this;
+        return _this;
     }
     return K;
 }(G));
@@ -218,6 +224,7 @@ var L = (function (_super) {
         var _this;
         _this = _super.call(this) || this; // NO ERROR
         _this.p1 = p1;
+        return _this;
     }
     return L;
 }(G));
@@ -228,6 +235,7 @@ var M = (function (_super) {
         _this.p1 = p1;
         var i = 0;
         _this = _super.call(this) || this;
+        return _this;
     }
     return M;
 }(G));
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
index b961b8fa4a5fa..5f2a5e89301d7 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
@@ -46,6 +46,7 @@ var b = (function (_super) {
         _this = _super.call(this) || this;
         function _super() {
         }
+        return _this;
     }
     return b;
 }(Foo));
@@ -58,6 +59,7 @@ var c = (function (_super) {
             function _super() {
             }
         };
+        return _this;
     }
     return c;
 }(Foo));
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
index e3d834dd1d415..a6893c6a57a7c 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
@@ -48,6 +48,7 @@ var b = (function (_super) {
                 }
             }
         };
+        return _this;
     }
     return b;
 }(Foo));
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
index b3ef300076262..d799c78350369 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
@@ -39,6 +39,7 @@ var b = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         var _super = 10; // Should be error 
+        return _this;
     }
     return b;
 }(Foo));
@@ -50,6 +51,7 @@ var c = (function (_super) {
         var x = function () {
             var _super = 10; // Should be error
         };
+        return _this;
     }
     return c;
 }(Foo));
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
index e7cb0e613cc4f..4bb4f6a5a8b73 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
@@ -46,6 +46,7 @@ var b = (function (_super) {
             }
         };
         _this._super = 10; // No error
+        return _this;
     }
     return b;
 }(Foo));
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index a60889888d663..6ed47a1b3c167 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -100,6 +100,7 @@ var Foo2 = (function (_super) {
             doStuff: function (_super) {
             }
         };
+        return _this;
     }
     Foo2.prototype.x = function () {
         var _this = this;
@@ -126,6 +127,7 @@ var Foo4 = (function (_super) {
     function Foo4(_super) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     Foo4.prototype.y = function (_super) {
         var _this = this;
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index 696f439a4b129..2d3709fa878a9 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -46,6 +46,7 @@ var b1 = (function (_super) {
     function b1(_super) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return b1;
 }(a));
@@ -55,6 +56,7 @@ var b2 = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this._super = _super;
+        return _this;
     }
     return b2;
 }(a));
@@ -63,6 +65,7 @@ var b3 = (function (_super) {
     function b3(_super) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return b3;
 }(a));
@@ -72,6 +75,7 @@ var b4 = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this._super = _super;
+        return _this;
     }
     return b4;
 }(a));
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 860c0b90e4839..370ee0d246ca3 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -229,6 +229,7 @@ var c3 = (function (_super) {
     function c3() {
         var _this;
         _this = _super.call(this, 10) || this;
+        return _this;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
diff --git a/tests/baselines/reference/compoundAssignmentLHSIsValue.js b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
index 2057d63b38fac..dfbdf31c3d1c3 100644
--- a/tests/baselines/reference/compoundAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
@@ -201,6 +201,7 @@ var Derived = (function (_super) {
         _this = _super.call(this) || this;
         _super.prototype. *= value;
         _super.prototype. += value;
+        return _this;
     }
     Derived.prototype.foo = function () {
         _super.prototype. *= value;
diff --git a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
index ef29163eda65d..da670472b4759 100644
--- a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
@@ -143,6 +143,7 @@ var Derived = (function (_super) {
         _this = _super.call(this) || this;
         (_a = _super.prototype). = Math.pow(_a., value);
         var _a;
+        return _this;
     }
     Derived.prototype.foo = function () {
         (_a = _super.prototype). = Math.pow(_a., value);
diff --git a/tests/baselines/reference/computedPropertyNames28_ES5.js b/tests/baselines/reference/computedPropertyNames28_ES5.js
index aaac258504cdc..8152394cbf8c5 100644
--- a/tests/baselines/reference/computedPropertyNames28_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames28_ES5.js
@@ -29,6 +29,7 @@ var C = (function (_super) {
         var obj = (_a = {},
             _a[(_this = _super.call(this) || this, "prop")] = function () { },
             _a);
+        return _this;
         var _a;
     }
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames30_ES5.js b/tests/baselines/reference/computedPropertyNames30_ES5.js
index 9fbe5f380ca85..9f4a4ab51f9bc 100644
--- a/tests/baselines/reference/computedPropertyNames30_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames30_ES5.js
@@ -40,6 +40,7 @@ var C = (function (_super) {
                 _a);
             var _a;
         });
+        return _this;
     }
     return C;
 }(Base));
diff --git a/tests/baselines/reference/constructorArgs.js b/tests/baselines/reference/constructorArgs.js
index 2c2838c97f96f..c7939472a9609 100644
--- a/tests/baselines/reference/constructorArgs.js
+++ b/tests/baselines/reference/constructorArgs.js
@@ -32,6 +32,7 @@ var Sub = (function (_super) {
         var _this;
         _this = _super.call(this, options.value) || this;
         _this.options = options;
+        return _this;
     }
     return Sub;
 }(Super));
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index a235e2555f3b0..4f70c7d7f35d1 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -49,6 +49,7 @@ var Derived = (function (_super) {
     function Derived(x) {
         var _this;
         _this = _super.call(this, x) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -59,6 +60,7 @@ var Derived2 = (function (_super) {
         var _this;
         _this = _super.call(this, x) || this;
         return 1;
+        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/constructorOverloads2.js b/tests/baselines/reference/constructorOverloads2.js
index a0ed6d890d4f8..0041acb489e03 100644
--- a/tests/baselines/reference/constructorOverloads2.js
+++ b/tests/baselines/reference/constructorOverloads2.js
@@ -42,6 +42,7 @@ var Foo = (function (_super) {
     function Foo(x, y) {
         var _this;
         _this = _super.call(this, x) || this;
+        return _this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/constructorOverloads3.js b/tests/baselines/reference/constructorOverloads3.js
index 7bc7989f7a316..c0ae9b452f98c 100644
--- a/tests/baselines/reference/constructorOverloads3.js
+++ b/tests/baselines/reference/constructorOverloads3.js
@@ -32,6 +32,7 @@ var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
         var _this;
+        return _this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 50280b589b33d..0e5351e69eadd 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -60,6 +60,7 @@ var templa;
                 function AbstractElementController() {
                     var _this;
                     _this = _super.call(this) || this;
+                    return _this;
                 }
                 return AbstractElementController;
             }(templa.mvc.AbstractController));
@@ -82,6 +83,7 @@ var templa;
                         var _this;
                         _this = _super.call(this) || this;
                         _this._controllers = [];
+                        return _this;
                     }
                     return AbstractCompositeElementController;
                 }(templa.dom.mvc.AbstractElementController));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor2.js b/tests/baselines/reference/decoratorOnClassConstructor2.js
index d50912fbeac59..1f0b9b0d51722 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor2.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor2.js
@@ -47,6 +47,7 @@ var C = (function (_super) {
     function C(prop) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return C;
 }(_0_ts_1.base));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor3.js b/tests/baselines/reference/decoratorOnClassConstructor3.js
index 6f37ad9dea146..9182cce66f4ce 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor3.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor3.js
@@ -50,6 +50,7 @@ var C = (function (_super) {
     function C(prop) {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return C;
 }(_0_1.base));
diff --git a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
index 58903b2ba5745..e76f3445c8eb2 100644
--- a/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
+++ b/tests/baselines/reference/derivedClassConstructorWithoutSuperCall.js
@@ -48,6 +48,7 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
         var _this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -61,6 +62,7 @@ var Derived2 = (function (_super) {
     function Derived2() {
         var _this;
         var r2 = function () { return _this = _super.call(this) || this; }; // error for misplaced super call (nested function)
+        return _this;
     }
     return Derived2;
 }(Base2));
@@ -69,6 +71,7 @@ var Derived3 = (function (_super) {
     function Derived3() {
         var _this;
         var r = function () { _this = _super.call(this) || this; }; // error
+        return _this;
     }
     return Derived3;
 }(Base2));
@@ -77,6 +80,7 @@ var Derived4 = (function (_super) {
     function Derived4() {
         var _this;
         var r = _this = _super.call(this) || this; // ok
+        return _this;
     }
     return Derived4;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
index 605ad6afa454d..fd601ff221162 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
@@ -34,6 +34,7 @@ var DerivedClass = (function (_super) {
     function DerivedClass() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     DerivedClass.prototype._init = function () {
     };
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
index d3e3fe5d4c9ab..12344c199158c 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
@@ -68,6 +68,7 @@ var Derived = (function (_super) {
     function Derived(a) {
         var _this;
         _this = _super.call(this, x) || this;
+        return _this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index 1f43469596a7a..37be9e209ac57 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -96,6 +96,7 @@ var Derived = (function (_super) {
     function Derived(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
index d678f5ce59f8a..0836c9d7f41dc 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
@@ -105,6 +105,7 @@ var Derived1 = (function (_super) {
     function Derived1(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     return Derived1;
 }(Base));
@@ -113,6 +114,7 @@ var Derived2 = (function (_super) {
     function Derived2(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Derived2.prototype.b = function (a) { };
     return Derived2;
@@ -122,6 +124,7 @@ var Derived3 = (function (_super) {
     function Derived3(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Object.defineProperty(Derived3.prototype, "c", {
         get: function () { return x; },
@@ -135,6 +138,7 @@ var Derived4 = (function (_super) {
     function Derived4(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Object.defineProperty(Derived4.prototype, "c", {
         set: function (v) { },
@@ -148,6 +152,7 @@ var Derived5 = (function (_super) {
     function Derived5(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     return Derived5;
 }(Base));
@@ -156,6 +161,7 @@ var Derived6 = (function (_super) {
     function Derived6(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     return Derived6;
 }(Base));
@@ -164,6 +170,7 @@ var Derived7 = (function (_super) {
     function Derived7(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Derived7.s = function (a) { };
     return Derived7;
@@ -173,6 +180,7 @@ var Derived8 = (function (_super) {
     function Derived8(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Object.defineProperty(Derived8, "t", {
         get: function () { return x; },
@@ -186,6 +194,7 @@ var Derived9 = (function (_super) {
     function Derived9(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     Object.defineProperty(Derived9, "t", {
         set: function (v) { },
@@ -199,6 +208,7 @@ var Derived10 = (function (_super) {
     function Derived10(a) {
         var _this;
         _this = _super.call(this, a) || this;
+        return _this;
     }
     return Derived10;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index 7839398551dc9..8d0375ab13a26 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -94,6 +94,7 @@ var Derived = (function (_super) {
     function Derived(a) {
         var _this;
         _this = _super.call(this, x) || this;
+        return _this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassParameterProperties.js b/tests/baselines/reference/derivedClassParameterProperties.js
index 658e56fb09819..f623653d6fa46 100644
--- a/tests/baselines/reference/derivedClassParameterProperties.js
+++ b/tests/baselines/reference/derivedClassParameterProperties.js
@@ -112,6 +112,7 @@ var Derived = (function (_super) {
         var _this;
         var a = 1;
         _this = _super.call(this) || this; // ok
+        return _this;
     }
     return Derived;
 }(Base));
@@ -122,6 +123,7 @@ var Derived2 = (function (_super) {
         _this.y = y;
         var a = 1;
         _this = _super.call(this) || this; // error
+        return _this;
     }
     return Derived2;
 }(Base));
@@ -132,6 +134,7 @@ var Derived3 = (function (_super) {
         _this = _super.call(this) || this; // ok
         _this.y = y;
         var a = 1;
+        return _this;
     }
     return Derived3;
 }(Base));
@@ -142,6 +145,7 @@ var Derived4 = (function (_super) {
         _this.a = 1;
         var b = 2;
         _this = _super.call(this) || this; // error
+        return _this;
     }
     return Derived4;
 }(Base));
@@ -152,6 +156,7 @@ var Derived5 = (function (_super) {
         _this = _super.call(this) || this; // ok
         _this.a = 1;
         var b = 2;
+        return _this;
     }
     return Derived5;
 }(Base));
@@ -162,6 +167,7 @@ var Derived6 = (function (_super) {
         _this.a = 1;
         var b = 2;
         _this = _super.call(this) || this; // error: "super" has to be called before "this" accessing
+        return _this;
     }
     return Derived6;
 }(Base));
@@ -173,6 +179,7 @@ var Derived7 = (function (_super) {
         _this.a = 3;
         _this.b = 3;
         _this = _super.call(this) || this; // error
+        return _this;
     }
     return Derived7;
 }(Base));
@@ -184,6 +191,7 @@ var Derived8 = (function (_super) {
         _this.a = 1;
         _this.a = 3;
         _this.b = 3;
+        return _this;
     }
     return Derived8;
 }(Base));
@@ -201,6 +209,7 @@ var Derived9 = (function (_super) {
         _this.a = 3;
         _this.b = 3;
         _this = _super.call(this) || this; // error
+        return _this;
     }
     return Derived9;
 }(Base2));
@@ -212,6 +221,7 @@ var Derived10 = (function (_super) {
         _this.a = 1;
         _this.a = 3;
         _this.b = 3;
+        return _this;
     }
     return Derived10;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
index 6b06204b8e976..e3bbf2699c5a9 100644
--- a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
+++ b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
@@ -49,6 +49,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.a = _this = _super.call(this) || this;
+        return _this;
     }
     Derived.prototype.b = function () {
         _this = _super.call(this) || this;
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index e73d004120653..102944889bdf8 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -44,6 +44,7 @@ var Derived = (function (_super) {
     function Derived() {
         var _this;
         _this = _super.call(this, _this) || this; // ok
+        return _this;
     }
     return Derived;
 }(Base));
@@ -53,6 +54,7 @@ var Derived2 = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // error
         _this.a = a;
+        return _this;
     }
     return Derived2;
 }(Base));
@@ -62,6 +64,7 @@ var Derived3 = (function (_super) {
         var _this;
         _this = _super.call(this, function () { return _this; }) || this; // error
         _this.a = a;
+        return _this;
     }
     return Derived3;
 }(Base));
@@ -71,6 +74,7 @@ var Derived4 = (function (_super) {
         var _this;
         _this = _super.call(this, function () { return this; }) || this; // ok
         _this.a = a;
+        return _this;
     }
     return Derived4;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
index cc260f094997e..f5eb3d22360ac 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
@@ -45,6 +45,7 @@ var Derived = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
+        return _this;
     }
     return Derived;
 }(Base));
@@ -63,6 +64,7 @@ var D = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
+        return _this;
     }
     return D;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
index d3711ec27c0db..5ad203892308c 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
@@ -53,6 +53,7 @@ var Derived = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
+        return _this;
     }
     return Derived;
 }(Base));
@@ -73,6 +74,7 @@ var D = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
+        return _this;
     }
     return D;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
index 14f9fdf88af29..d0e5f22d4f3d4 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
@@ -67,6 +67,7 @@ var Derived = (function (_super) {
         _this = _super.call(this, 2) || this;
         _this.b = '';
         _this.b = y;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -77,6 +78,7 @@ var Derived2 = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
+        return _this;
     }
     return Derived2;
 }(Derived));
@@ -96,6 +98,7 @@ var D = (function (_super) {
         _this = _super.call(this, 2) || this;
         _this.b = null;
         _this.b = y;
+        return _this;
     }
     return D;
 }(Base));
@@ -106,6 +109,7 @@ var D2 = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
+        return _this;
     }
     return D2;
 }(D));
diff --git a/tests/baselines/reference/destructuringParameterDeclaration5.js b/tests/baselines/reference/destructuringParameterDeclaration5.js
index a1f109ed49ea2..8c35b9044a19d 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration5.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration5.js
@@ -67,6 +67,7 @@ var SubClass = (function (_super) {
     function SubClass() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return SubClass;
 }(Class));
@@ -80,6 +81,7 @@ var SubD = (function (_super) {
     function SubD() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return SubD;
 }(D));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
index 60fa8e32c1e2d..b95263464a75c 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
@@ -33,6 +33,7 @@ var B = (function (_super) {
         'someStringForEgngInject';
         _this = _super.call(this) || this;
         _this.x = x;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
index abef8394924e4..f078c448b7549 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
@@ -35,6 +35,7 @@ var B = (function (_super) {
         'someStringForEgngInject';
         _this = _super.call(this) || this;
         _this.blub = 12;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
index 0f36d9d9115f9..e64af9ef86240 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
@@ -34,6 +34,7 @@ var B = (function (_super) {
         _this = _super.call(this) || this;
         _this.x = x;
         _this.blah = 2;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/errorSuperCalls.js b/tests/baselines/reference/errorSuperCalls.js
index 4f54781deb993..864bc19a34452 100644
--- a/tests/baselines/reference/errorSuperCalls.js
+++ b/tests/baselines/reference/errorSuperCalls.js
@@ -135,6 +135,7 @@ var Derived = (function (_super) {
         var _this;
         _super.prototype..call(_this);
         _this = _super.call(this) || this;
+        return _this;
     }
     return Derived;
 }(Base));
@@ -150,6 +151,7 @@ var OtherDerived = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         //super call in class member initializer of derived type
         _this.t = _this = _super.call(this) || this;
+        return _this;
     }
     OtherDerived.prototype.fn = function () {
         //super call in class member function of derived type
diff --git a/tests/baselines/reference/errorSuperPropertyAccess.js b/tests/baselines/reference/errorSuperPropertyAccess.js
index 18c98868e937e..1b7c9a418fc65 100644
--- a/tests/baselines/reference/errorSuperPropertyAccess.js
+++ b/tests/baselines/reference/errorSuperPropertyAccess.js
@@ -189,6 +189,7 @@ var SomeDerived1 = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _super.prototype.publicMember = 1;
+        return _this;
     }
     SomeDerived1.prototype.fn = function () {
         var x = _super.prototype.publicMember;
@@ -223,6 +224,7 @@ var SomeDerived2 = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _super.prototype.privateMember = 1;
+        return _this;
     }
     SomeDerived2.prototype.fn = function () {
         var x = _super.prototype.privateMember;
diff --git a/tests/baselines/reference/es6ClassSuperCodegenBug.js b/tests/baselines/reference/es6ClassSuperCodegenBug.js
index 88000a12bbe53..2eec250211e98 100644
--- a/tests/baselines/reference/es6ClassSuperCodegenBug.js
+++ b/tests/baselines/reference/es6ClassSuperCodegenBug.js
@@ -35,6 +35,7 @@ var B = (function (_super) {
         else {
             _this = _super.call(this, 'a2', 'b2') || this;
         }
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/es6ClassTest.js b/tests/baselines/reference/es6ClassTest.js
index 4b2cb2c51b55d..705915812be47 100644
--- a/tests/baselines/reference/es6ClassTest.js
+++ b/tests/baselines/reference/es6ClassTest.js
@@ -111,6 +111,7 @@ var Foo = (function (_super) {
         _this.zoo = "zoo";
         _this.x = x;
         _this.gar = 5;
+        return _this;
     }
     Foo.prototype.bar = function () { return 0; };
     Foo.prototype.boo = function (x) { return x; };
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index ebf779f7bba71..eec5d830e011c 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -269,6 +269,7 @@ var SuperChild = (function (_super) {
     function SuperChild() {
         var _this;
         _this = _super.call(this, 1) || this;
+        return _this;
     }
     SuperChild.prototype.b = function () {
         _super.prototype.b.call(this, 'str');
diff --git a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
index 0cc1f5867a24d..ccbac1d22b5ae 100644
--- a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
+++ b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
@@ -111,6 +111,7 @@ var PortalFx;
                     function Validator(message) {
                         var _this;
                         _this = _super.call(this, message) || this;
+                        return _this;
                     }
                     return Validator;
                 }(Portal.Controls.Validators.Validator));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
index 4581ecc31ecca..246b9b76e3c57 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
@@ -54,6 +54,7 @@ var EndGate;
             function NumberTween(from) {
                 var _this;
                 _this = _super.call(this, from) || this;
+                return _this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
index 8f1e9c8365fea..e7744b28833ca 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
@@ -53,6 +53,7 @@ var EndGate;
             function NumberTween(from) {
                 var _this;
                 _this = _super.call(this, from) || this;
+                return _this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
index 49109e1aa5af1..d22823b9f8152 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
@@ -62,6 +62,7 @@ var TypeScript;
             var _this;
             _this = _super.apply(this, arguments) || this;
             _this._elementType = null;
+            return _this;
         }
         PullTypeSymbol.prototype.toString = function (scopeSymbol, useConstraintInName) {
             var s = this.getScopedNameEx(scopeSymbol, useConstraintInName).toString();
diff --git a/tests/baselines/reference/genericTypeConstraints.js b/tests/baselines/reference/genericTypeConstraints.js
index 761220ae11af5..48ff00e5ac25b 100644
--- a/tests/baselines/reference/genericTypeConstraints.js
+++ b/tests/baselines/reference/genericTypeConstraints.js
@@ -40,6 +40,7 @@ var BarExtended = (function (_super) {
     function BarExtended() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return BarExtended;
 }(Bar));
diff --git a/tests/baselines/reference/illegalSuperCallsInConstructor.js b/tests/baselines/reference/illegalSuperCallsInConstructor.js
index 77f0a0a2b6b3f..868d53daad54b 100644
--- a/tests/baselines/reference/illegalSuperCallsInConstructor.js
+++ b/tests/baselines/reference/illegalSuperCallsInConstructor.js
@@ -47,6 +47,7 @@ var Derived = (function (_super) {
                 _this = _super.call(this) || this;
             }
         };
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
index 3f205640f5981..51c64f48f6c57 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
@@ -43,6 +43,7 @@ var D = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = 3;
+        return _this;
     }
     D.prototype.foo = function (x) { return x; };
     D.prototype.other = function (x) { return x; };
@@ -55,6 +56,7 @@ var D2 = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.x = "";
+        return _this;
     }
     D2.prototype.foo = function (x) { return x; };
     D2.prototype.other = function (x) { return x; };
diff --git a/tests/baselines/reference/lift.js b/tests/baselines/reference/lift.js
index bfbf75b17310b..a71f1c9065ae2 100644
--- a/tests/baselines/reference/lift.js
+++ b/tests/baselines/reference/lift.js
@@ -36,6 +36,7 @@ var C = (function (_super) {
         _this = _super.call(this, y) || this;
         var x = 10 + w;
         var ll = x * w;
+        return _this;
     }
     C.prototype.liftxyz = function () { return x + z + this.y; };
     C.prototype.liftxylocllz = function () { return x + z + this.y + this.ll; };
diff --git a/tests/baselines/reference/missingPropertiesOfClassExpression.js b/tests/baselines/reference/missingPropertiesOfClassExpression.js
index c1f4480241c19..20252f37e6173 100644
--- a/tests/baselines/reference/missingPropertiesOfClassExpression.js
+++ b/tests/baselines/reference/missingPropertiesOfClassExpression.js
@@ -17,6 +17,7 @@ var George = (function (_super) {
     function George() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return George;
 }((function () {
diff --git a/tests/baselines/reference/objectCreationOfElementAccessExpression.js b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
index 9543082fbd16a..760454dd9a469 100644
--- a/tests/baselines/reference/objectCreationOfElementAccessExpression.js
+++ b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
@@ -84,6 +84,7 @@ var MonsterFood = (function (_super) {
         var _this;
         _this = _super.call(this, name) || this;
         _this.flavor = flavor;
+        return _this;
     }
     return MonsterFood;
 }(Food));
@@ -93,6 +94,7 @@ var IceCream = (function (_super) {
         var _this;
         _this = _super.call(this, "Ice Cream", flavor) || this;
         _this.flavor = flavor;
+        return _this;
     }
     return IceCream;
 }(MonsterFood));
@@ -103,6 +105,7 @@ var Cookie = (function (_super) {
         _this = _super.call(this, "Cookie", flavor) || this;
         _this.flavor = flavor;
         _this.isGlutenFree = isGlutenFree;
+        return _this;
     }
     return Cookie;
 }(MonsterFood));
@@ -112,6 +115,7 @@ var PetFood = (function (_super) {
         var _this;
         _this = _super.call(this, name) || this;
         _this.whereToBuy = whereToBuy;
+        return _this;
     }
     return PetFood;
 }(Food));
@@ -121,6 +125,7 @@ var ExpensiveOrganicDogFood = (function (_super) {
         var _this;
         _this = _super.call(this, "Origen", whereToBuy) || this;
         _this.whereToBuy = whereToBuy;
+        return _this;
     }
     return ExpensiveOrganicDogFood;
 }(PetFood));
@@ -131,6 +136,7 @@ var ExpensiveOrganicCatFood = (function (_super) {
         _this = _super.call(this, "Nature's Logic", whereToBuy) || this;
         _this.whereToBuy = whereToBuy;
         _this.containsFish = containsFish;
+        return _this;
     }
     return ExpensiveOrganicCatFood;
 }(PetFood));
diff --git a/tests/baselines/reference/optionalMethods.js b/tests/baselines/reference/optionalMethods.js
index 1885c419fef8b..72df561227f58 100644
--- a/tests/baselines/reference/optionalMethods.js
+++ b/tests/baselines/reference/optionalMethods.js
@@ -112,6 +112,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.a = 1;
+        return _this;
     }
     Derived.prototype.f = function () { return 1; };
     return Derived;
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index f53f0c74a541b..258f05cbc8541 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -164,6 +164,7 @@ var C2 = (function (_super) {
         var _this;
         if (v2 === void 0) { v2 = 6; }
         _this = _super.call(this, v2) || this;
+        return _this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/optionalParameterProperty.js b/tests/baselines/reference/optionalParameterProperty.js
index 44eb2a7aa5628..ca78ad7286e38 100644
--- a/tests/baselines/reference/optionalParameterProperty.js
+++ b/tests/baselines/reference/optionalParameterProperty.js
@@ -28,6 +28,7 @@ var D = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this.p = p;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks4.js b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
index 22bacbdb0b4c2..360b38ce70cb9 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks4.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
@@ -30,6 +30,7 @@ var A = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.x = 1;
+        return _this;
     }
     return A;
 }(Z));
diff --git a/tests/baselines/reference/parserAstSpans1.js b/tests/baselines/reference/parserAstSpans1.js
index 365e640c15099..799a17d47deb3 100644
--- a/tests/baselines/reference/parserAstSpans1.js
+++ b/tests/baselines/reference/parserAstSpans1.js
@@ -321,6 +321,7 @@ var c3 = (function (_super) {
         var _this;
         _this = _super.call(this, 10) || this;
         _this.p1 = _super.prototype.c2_p1;
+        return _this;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
@@ -409,6 +410,7 @@ var c6 = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this.d = _super.prototype.b;
+        return _this;
     }
     return c6;
 }(c5));
diff --git a/tests/baselines/reference/parserRealSource10.js b/tests/baselines/reference/parserRealSource10.js
index c9f011704d035..88516c9a692e9 100644
--- a/tests/baselines/reference/parserRealSource10.js
+++ b/tests/baselines/reference/parserRealSource10.js
@@ -830,6 +830,7 @@ var TypeScript;
             _this = _super.call(this, TokenID.NumberLiteral) || this;
             _this.value = value;
             _this.hasEmptyFraction = hasEmptyFraction;
+            return _this;
         }
         NumberLiteralToken.prototype.getText = function () {
             return this.hasEmptyFraction ? this.value.toString() + ".0" : this.value.toString();
@@ -846,6 +847,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, TokenID.StringLiteral) || this;
             _this.value = value;
+            return _this;
         }
         StringLiteralToken.prototype.getText = function () {
             return this.value;
@@ -863,6 +865,7 @@ var TypeScript;
             _this = _super.call(this, TokenID.Identifier) || this;
             _this.value = value;
             _this.hasEscapeSequence = hasEscapeSequence;
+            return _this;
         }
         IdentifierToken.prototype.getText = function () {
             return this.value;
@@ -879,6 +882,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, tokenId) || this;
             _this.value = value;
+            return _this;
         }
         WhitespaceToken.prototype.getText = function () {
             return this.value;
@@ -899,6 +903,7 @@ var TypeScript;
             _this.startPos = startPos;
             _this.line = line;
             _this.endsLine = endsLine;
+            return _this;
         }
         CommentToken.prototype.getText = function () {
             return this.value;
@@ -915,6 +920,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, TokenID.RegularExpressionLiteral) || this;
             _this.regex = regex;
+            return _this;
         }
         RegularExpressionLiteralToken.prototype.getText = function () {
             return this.regex.toString();
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index 054608e9d19ab..fa112e51dadb0 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2396,6 +2396,7 @@ var TypeScript;
             _this.preComments = null;
             _this.postComments = null;
             _this.isParenthesized = false;
+            return _this;
         }
         AST.prototype.isExpression = function () { return false; };
         AST.prototype.isStatementOrExpression = function () { return false; };
@@ -2547,6 +2548,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.Error) || this;
             _this.minChar = min;
             _this.limChar = lim;
+            return _this;
         }
         return IncompleteAST;
     }(AST));
@@ -2558,6 +2560,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.List) || this;
             _this.enclosingScope = null;
             _this.members = new AST[];
+            return _this;
         }
         ASTList.prototype.addToControlFlow = function (context) {
             var len = this.members.length;
@@ -2629,6 +2632,7 @@ var TypeScript;
             _this.sym = null;
             _this.cloId = -1;
             _this.setText(actualText, hasEscapeSequence);
+            return _this;
         }
         Identifier.prototype.setText = function (actualText, hasEscapeSequence) {
             this.actualText = actualText;
@@ -2669,6 +2673,7 @@ var TypeScript;
         function MissingIdentifier() {
             var _this;
             _this = _super.call(this, "__missing") || this;
+            return _this;
         }
         MissingIdentifier.prototype.isMissing = function () {
             return true;
@@ -2685,6 +2690,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Label) || this;
             _this.id = id;
+            return _this;
         }
         Label.prototype.printLabel = function () { return this.id.actualText + ":"; };
         Label.prototype.typeCheck = function (typeFlow) {
@@ -2709,6 +2715,7 @@ var TypeScript;
         function Expression(nodeType) {
             var _this;
             _this = _super.call(this, nodeType) || this;
+            return _this;
         }
         Expression.prototype.isExpression = function () { return true; };
         Expression.prototype.isStatementOrExpression = function () { return true; };
@@ -2723,6 +2730,7 @@ var TypeScript;
             _this.operand = operand;
             _this.targetType = null; // Target type for an object literal (null if no target type)
             _this.castTerm = null;
+            return _this;
         }
         UnaryExpression.prototype.addToControlFlow = function (context) {
             _super.prototype.addToControlFlow.call(this, context);
@@ -2869,6 +2877,7 @@ var TypeScript;
             _this.arguments = arguments;
             _this.signature = null;
             _this.minChar = _this.target.minChar;
+            return _this;
         }
         CallExpression.prototype.typeCheck = function (typeFlow) {
             if (this.nodeType == NodeType.New) {
@@ -2900,6 +2909,7 @@ var TypeScript;
             _this = _super.call(this, nodeType) || this;
             _this.operand1 = operand1;
             _this.operand2 = operand2;
+            return _this;
         }
         BinaryExpression.prototype.typeCheck = function (typeFlow) {
             switch (this.nodeType) {
@@ -3054,6 +3064,7 @@ var TypeScript;
             _this.operand1 = operand1;
             _this.operand2 = operand2;
             _this.operand3 = operand3;
+            return _this;
         }
         ConditionalExpression.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckQMark(this);
@@ -3080,6 +3091,7 @@ var TypeScript;
             _this.value = value;
             _this.hasEmptyFraction = hasEmptyFraction;
             _this.isNegativeZero = false;
+            return _this;
         }
         NumberLiteral.prototype.typeCheck = function (typeFlow) {
             this.type = typeFlow.doubleType;
@@ -3120,6 +3132,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Regex) || this;
             _this.regex = regex;
+            return _this;
         }
         RegexLiteral.prototype.typeCheck = function (typeFlow) {
             this.type = typeFlow.regexType;
@@ -3141,6 +3154,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.QString) || this;
             _this.text = text;
+            return _this;
         }
         StringLiteral.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3167,6 +3181,7 @@ var TypeScript;
         function ModuleElement(nodeType) {
             var _this;
             _this = _super.call(this, nodeType) || this;
+            return _this;
         }
         return ModuleElement;
     }(AST));
@@ -3180,6 +3195,7 @@ var TypeScript;
             _this.alias = alias;
             _this.varFlags = VarFlags.None;
             _this.isDynamicImport = false;
+            return _this;
         }
         ImportDeclaration.prototype.isStatementOrExpression = function () { return true; };
         ImportDeclaration.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3242,6 +3258,7 @@ var TypeScript;
             _this.typeExpr = null;
             _this.varFlags = VarFlags.None;
             _this.sym = null;
+            return _this;
         }
         BoundDecl.prototype.isStatementOrExpression = function () { return true; };
         BoundDecl.prototype.isPrivate = function () { return hasFlag(this.varFlags, VarFlags.Private); };
@@ -3261,6 +3278,7 @@ var TypeScript;
         function VarDecl(id, nest) {
             var _this;
             _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
+            return _this;
         }
         VarDecl.prototype.isAmbient = function () { return hasFlag(this.varFlags, VarFlags.Ambient); };
         VarDecl.prototype.isExported = function () { return hasFlag(this.varFlags, VarFlags.Exported); };
@@ -3281,6 +3299,7 @@ var TypeScript;
             _this = _super.call(this, id, NodeType.ArgDecl, 0) || this;
             _this.isOptional = false;
             _this.parameterPropertySym = null;
+            return _this;
         }
         ArgDecl.prototype.isOptionalArg = function () { return this.isOptional || this.init; };
         ArgDecl.prototype.treeViewLabel = function () {
@@ -3331,6 +3350,7 @@ var TypeScript;
             _this.returnStatementsWithExpressions = [];
             _this.scopeType = null; // Type of the FuncDecl, before target typing
             _this.endingToken = null;
+            return _this;
         }
         FuncDecl.prototype.internalName = function () {
             if (this.internalNameCache == null) {
@@ -3458,6 +3478,7 @@ var TypeScript;
             _this.containsUnicodeCharInComment = false;
             _this.vars = vars;
             _this.scopes = scopes;
+            return _this;
         }
         Script.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckScript(this);
@@ -3517,6 +3538,7 @@ var TypeScript;
             _this.members = members;
             _this.leftCurlyCount = 0;
             _this.rightCurlyCount = 0;
+            return _this;
         }
         return NamedDeclaration;
     }(ModuleElement));
@@ -3535,6 +3557,7 @@ var TypeScript;
             _this.vars = vars;
             _this.scopes = scopes;
             _this.prettyName = _this.name.actualText;
+            return _this;
         }
         ModuleDeclaration.prototype.isExported = function () { return hasFlag(this.modFlags, ModuleFlags.Exported); };
         ModuleDeclaration.prototype.isAmbient = function () { return hasFlag(this.modFlags, ModuleFlags.Ambient); };
@@ -3565,6 +3588,7 @@ var TypeScript;
             _this.extendsList = extendsList;
             _this.implementsList = implementsList;
             _this.varFlags = VarFlags.None;
+            return _this;
         }
         TypeDeclaration.prototype.isExported = function () {
             return hasFlag(this.varFlags, VarFlags.Exported);
@@ -3584,6 +3608,7 @@ var TypeScript;
             _this.constructorDecl = null;
             _this.constructorNestingLevel = 0;
             _this.endingToken = null;
+            return _this;
         }
         ClassDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckClass(this);
@@ -3599,6 +3624,7 @@ var TypeScript;
         function InterfaceDeclaration(name, members, extendsList, implementsList) {
             var _this;
             _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
+            return _this;
         }
         InterfaceDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckInterface(this);
@@ -3614,6 +3640,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, nodeType) || this;
             _this.flags |= ASTFlags.IsStatement;
+            return _this;
         }
         Statement.prototype.isLoop = function () { return false; };
         Statement.prototype.isStatementOrExpression = function () { return true; };
@@ -3632,6 +3659,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.LabeledStatement) || this;
             _this.labels = labels;
             _this.stmt = stmt;
+            return _this;
         }
         LabeledStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3667,6 +3695,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.Block) || this;
             _this.statements = statements;
             _this.isStatementBlock = isStatementBlock;
+            return _this;
         }
         Block.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3723,6 +3752,7 @@ var TypeScript;
             _this = _super.call(this, nodeType) || this;
             _this.target = null;
             _this.resolvedTarget = null;
+            return _this;
         }
         Jump.prototype.hasExplicitTarget = function () { return (this.target); };
         Jump.prototype.setResolvedTarget = function (parser, stmt) {
@@ -3775,6 +3805,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.While) || this;
             _this.cond = cond;
             _this.body = null;
+            return _this;
         }
         WhileStatement.prototype.isLoop = function () { return true; };
         WhileStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3829,6 +3860,7 @@ var TypeScript;
             _this.body = null;
             _this.whileAST = null;
             _this.cond = null;
+            return _this;
         }
         DoWhileStatement.prototype.isLoop = function () { return true; };
         DoWhileStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3886,6 +3918,7 @@ var TypeScript;
             _this.cond = cond;
             _this.elseBod = null;
             _this.statement = new ASTSpan();
+            return _this;
         }
         IfStatement.prototype.isCompoundStatement = function () { return true; };
         IfStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -3963,6 +3996,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Return) || this;
             _this.returnExpression = null;
+            return _this;
         }
         ReturnStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -3994,6 +4028,7 @@ var TypeScript;
         function EndCode() {
             var _this;
             _this = _super.call(this, NodeType.EndCode) || this;
+            return _this;
         }
         return EndCode;
     }(AST));
@@ -4009,6 +4044,7 @@ var TypeScript;
             if (_this.lval && (_this.lval.nodeType == NodeType.VarDecl)) {
                 _this.lval.varFlags |= VarFlags.AutoInit;
             }
+            return _this;
         }
         ForInStatement.prototype.isLoop = function () { return true; };
         ForInStatement.prototype.isFiltered = function () {
@@ -4120,6 +4156,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.For) || this;
             _this.init = init;
+            return _this;
         }
         ForStatement.prototype.isLoop = function () { return true; };
         ForStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4213,6 +4250,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.With) || this;
             _this.expr = expr;
             _this.withSym = null;
+            return _this;
         }
         WithStatement.prototype.isCompoundStatement = function () { return true; };
         WithStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4241,6 +4279,7 @@ var TypeScript;
             _this.val = val;
             _this.defaultCase = null;
             _this.statement = new ASTSpan();
+            return _this;
         }
         SwitchStatement.prototype.isCompoundStatement = function () { return true; };
         SwitchStatement.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4312,6 +4351,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Case) || this;
             _this.expr = null;
+            return _this;
         }
         CaseStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4367,6 +4407,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.TypeRef) || this;
             _this.term = term;
             _this.arrayCount = arrayCount;
+            return _this;
         }
         TypeReference.prototype.emit = function (emitter, tokenId, startLine) {
             throw new Error("should not emit a type ref");
@@ -4398,6 +4439,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.TryFinally) || this;
             _this.tryNode = tryNode;
             _this.finallyNode = finallyNode;
+            return _this;
         }
         TryFinally.prototype.isCompoundStatement = function () { return true; };
         TryFinally.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4444,6 +4486,7 @@ var TypeScript;
             _this = _super.call(this, NodeType.TryCatch) || this;
             _this.tryNode = tryNode;
             _this.catchNode = catchNode;
+            return _this;
         }
         TryCatch.prototype.isCompoundStatement = function () { return true; };
         TryCatch.prototype.emit = function (emitter, tokenId, startLine) {
@@ -4494,6 +4537,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Try) || this;
             _this.body = body;
+            return _this;
         }
         Try.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4529,6 +4573,7 @@ var TypeScript;
             if (_this.param) {
                 _this.param.varFlags |= VarFlags.AutoInit;
             }
+            return _this;
         }
         Catch.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4597,6 +4642,7 @@ var TypeScript;
             var _this;
             _this = _super.call(this, NodeType.Finally) || this;
             _this.body = body;
+            return _this;
         }
         Finally.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
@@ -4629,6 +4675,7 @@ var TypeScript;
             _this.isBlockComment = isBlockComment;
             _this.endsLine = endsLine;
             _this.text = null;
+            return _this;
         }
         Comment.prototype.getText = function () {
             if (this.text == null) {
@@ -4652,6 +4699,7 @@ var TypeScript;
         function DebuggerStatement() {
             var _this;
             _this = _super.call(this, NodeType.Debugger) || this;
+            return _this;
         }
         DebuggerStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index f0db6078832e5..2d219c63e6abe 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2384,6 +2384,7 @@ var Harness;
             _this = _super.call(this, description, block) || this;
             _this.description = description;
             _this.block = block;
+            return _this;
         }
         TestCase.prototype.addChild = function (child) {
             throw new Error("Testcases may not be nested inside other testcases");
@@ -2419,6 +2420,7 @@ var Harness;
             _this = _super.call(this, description, block) || this;
             _this.description = description;
             _this.block = block;
+            return _this;
         }
         /** Run the block, and if the block doesn't raise an error, run the children. */
         Scenario.prototype.run = function (done) {
@@ -2473,6 +2475,7 @@ var Harness;
         function Run() {
             var _this;
             _this = _super.call(this, 'Test Run', null) || this;
+            return _this;
         }
         Run.prototype.run = function () {
             emitLog('start');
diff --git a/tests/baselines/reference/privateInstanceMemberAccessibility.js b/tests/baselines/reference/privateInstanceMemberAccessibility.js
index 618c38b89d58f..c07238dff5ef3 100644
--- a/tests/baselines/reference/privateInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/privateInstanceMemberAccessibility.js
@@ -31,6 +31,7 @@ var Derived = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.x = _super.prototype.foo; // error
         _this.z = _super.prototype.foo; // error
+        return _this;
     }
     Derived.prototype.y = function () {
         return _super.prototype.foo; // error
diff --git a/tests/baselines/reference/privateStaticMemberAccessibility.js b/tests/baselines/reference/privateStaticMemberAccessibility.js
index e953198290b73..0d4cfefb63b08 100644
--- a/tests/baselines/reference/privateStaticMemberAccessibility.js
+++ b/tests/baselines/reference/privateStaticMemberAccessibility.js
@@ -25,6 +25,7 @@ var Derived = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this.bing = function () { return Base.foo; }; // error
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/readonlyConstructorAssignment.js b/tests/baselines/reference/readonlyConstructorAssignment.js
index f1b69ecc00b30..581b110298a32 100644
--- a/tests/baselines/reference/readonlyConstructorAssignment.js
+++ b/tests/baselines/reference/readonlyConstructorAssignment.js
@@ -60,6 +60,7 @@ var B = (function (_super) {
         _this = _super.call(this, x) || this;
         // Fails, x is readonly
         _this.x = 1;
+        return _this;
     }
     return B;
 }(A));
@@ -72,6 +73,7 @@ var C = (function (_super) {
         _this = _super.call(this, x) || this;
         _this.x = x;
         _this.x = 1;
+        return _this;
     }
     return C;
 }(A));
@@ -90,6 +92,7 @@ var E = (function (_super) {
         _this = _super.call(this, x) || this;
         _this.x = x;
         _this.x = 1;
+        return _this;
     }
     return E;
 }(D));
diff --git a/tests/baselines/reference/returnInConstructor1.js b/tests/baselines/reference/returnInConstructor1.js
index cd3a9f4c34682..0ee301758cf1f 100644
--- a/tests/baselines/reference/returnInConstructor1.js
+++ b/tests/baselines/reference/returnInConstructor1.js
@@ -126,6 +126,7 @@ var H = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         return new G(); //error
+        return _this;
     }
     return H;
 }(F));
@@ -135,6 +136,7 @@ var I = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         return new G();
+        return _this;
     }
     return I;
 }(G));
diff --git a/tests/baselines/reference/scopeTests.js b/tests/baselines/reference/scopeTests.js
index 3fd9018e94575..9436043094eb3 100644
--- a/tests/baselines/reference/scopeTests.js
+++ b/tests/baselines/reference/scopeTests.js
@@ -30,6 +30,7 @@ var D = (function (_super) {
         _this.v = 1;
         _this.p = 1;
         C.s = 1;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
index 29da6d52a3837..7fef0a420100e 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
@@ -25,6 +25,7 @@ var Greeter = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.a = 10;
         _this.nameA = "Ten";
+        return _this;
     }
     return Greeter;
 }(AbstractGreeter));
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
index 3a75f3d3b6696..14f7f65f05056 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
@@ -1,2 +1,2 @@
 //// [sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map]
-{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,OAAC,GAAG,EAAE,CAAC;QACP,WAAK,GAAG,KAAK,CAAC;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
+{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,OAAC,GAAG,EAAE,CAAC;QACP,WAAK,GAAG,KAAK,CAAC;;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
index 7c05c1b4d849d..e1adf2f7a297f 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
@@ -130,6 +130,7 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 4 >Emitted(17, 28) Source(6, 25) + SourceIndex(0)
 5 >Emitted(17, 29) Source(6, 26) + SourceIndex(0)
 ---
+>>>        return _this;
 >>>    }
 1 >^^^^
 2 >    ^
@@ -137,8 +138,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 1 >
   >
 2 >    }
-1 >Emitted(18, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(18, 6) Source(7, 2) + SourceIndex(0)
+1 >Emitted(19, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(19, 6) Source(7, 2) + SourceIndex(0)
 ---
 >>>    return Greeter;
 1->^^^^
@@ -146,8 +147,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 3 >                  ^^^->
 1->
 2 >    }
-1->Emitted(19, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(19, 19) Source(7, 2) + SourceIndex(0)
+1->Emitted(20, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(20, 19) Source(7, 2) + SourceIndex(0)
 ---
 >>>}(AbstractGreeter));
 1->
@@ -166,11 +167,11 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
   >                     public a = 10;
   >                     public nameA = "Ten";
   >                 }
-1->Emitted(20, 1) Source(7, 1) + SourceIndex(0)
-2 >Emitted(20, 2) Source(7, 2) + SourceIndex(0)
-3 >Emitted(20, 2) Source(4, 1) + SourceIndex(0)
-4 >Emitted(20, 3) Source(4, 23) + SourceIndex(0)
-5 >Emitted(20, 18) Source(4, 38) + SourceIndex(0)
-6 >Emitted(20, 21) Source(7, 2) + SourceIndex(0)
+1->Emitted(21, 1) Source(7, 1) + SourceIndex(0)
+2 >Emitted(21, 2) Source(7, 2) + SourceIndex(0)
+3 >Emitted(21, 2) Source(4, 1) + SourceIndex(0)
+4 >Emitted(21, 3) Source(4, 23) + SourceIndex(0)
+5 >Emitted(21, 18) Source(4, 38) + SourceIndex(0)
+6 >Emitted(21, 21) Source(7, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/staticInheritance.js b/tests/baselines/reference/staticInheritance.js
index 462f2382f3cd3..5e769cab563f8 100644
--- a/tests/baselines/reference/staticInheritance.js
+++ b/tests/baselines/reference/staticInheritance.js
@@ -31,6 +31,7 @@ var B = (function (_super) {
         _this = _super.apply(this, arguments) || this;
         _this.p1 = doThing(A); // OK
         _this.p2 = doThing(B); // OK
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/staticPropSuper.js b/tests/baselines/reference/staticPropSuper.js
index f5bac0135af14..6240f8c454f49 100644
--- a/tests/baselines/reference/staticPropSuper.js
+++ b/tests/baselines/reference/staticPropSuper.js
@@ -52,6 +52,7 @@ var B = (function (_super) {
         var _this;
         var x = 1; // should not error
         _this = _super.call(this) || this;
+        return _this;
     }
     return B;
 }(A));
@@ -62,6 +63,7 @@ var C = (function (_super) {
         var _this;
         _this.p = 10;
         var x = 1; // should error
+        return _this;
     }
     return C;
 }(A));
@@ -71,6 +73,7 @@ var D = (function (_super) {
         var _this;
         _this.p = 11;
         var x = 1; // should error
+        return _this;
     }
     return D;
 }(A));
@@ -80,6 +83,7 @@ var E = (function (_super) {
         var _this;
         _this.p = 12;
         var x = 1; // should error
+        return _this;
     }
     return E;
 }(A));
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index 1af13b1ce7a3e..4e1c483f1c192 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -78,6 +78,7 @@ var B = (function (_super) {
         "use strict"; // No error
         _this = _super.call(this) || this;
         _this.s = 9;
+        return _this;
     }
     return B;
 }(A));
@@ -88,6 +89,7 @@ var C = (function (_super) {
         _this = _super.call(this) || this; // No error
         _this.s = 9;
         "use strict";
+        return _this;
     }
     return C;
 }(A));
@@ -99,6 +101,7 @@ var D = (function (_super) {
         var x = 1; // Error
         _this = _super.call(this) || this;
         "use strict";
+        return _this;
     }
     return D;
 }(A));
@@ -108,6 +111,7 @@ var Bs = (function (_super) {
         var _this;
         "use strict"; // No error
         _this = _super.call(this) || this;
+        return _this;
     }
     return Bs;
 }(A));
@@ -118,6 +122,7 @@ var Cs = (function (_super) {
         var _this;
         _this = _super.call(this) || this; // No error
         "use strict";
+        return _this;
     }
     return Cs;
 }(A));
@@ -129,6 +134,7 @@ var Ds = (function (_super) {
         var x = 1; // no Error
         _this = _super.call(this) || this;
         "use strict";
+        return _this;
     }
     return Ds;
 }(A));
diff --git a/tests/baselines/reference/superAccess2.js b/tests/baselines/reference/superAccess2.js
index 807347e1d1653..408f9051badcb 100644
--- a/tests/baselines/reference/superAccess2.js
+++ b/tests/baselines/reference/superAccess2.js
@@ -48,6 +48,7 @@ var Q = (function (_super) {
         _this = _super.call(this) || this;
         _this.z = z;
         _this.xx = _super.prototype.;
+        return _this;
     }
     Q.prototype.foo = function (zz) {
         if (zz === void 0) { zz = _super.prototype.; }
diff --git a/tests/baselines/reference/superCallArgsMustMatch.js b/tests/baselines/reference/superCallArgsMustMatch.js
index 770cb0bf79f8b..dc450147f889e 100644
--- a/tests/baselines/reference/superCallArgsMustMatch.js
+++ b/tests/baselines/reference/superCallArgsMustMatch.js
@@ -45,6 +45,7 @@ var T6 = (function (_super) {
         // which is instantiated with 'number' in the extends clause
         _this = _super.call(this, "hi") || this;
         var x = _this.foo;
+        return _this;
     }
     return T6;
 }(T5));
diff --git a/tests/baselines/reference/superCallAssignResult.js b/tests/baselines/reference/superCallAssignResult.js
index 4eeabdfa2822c..6e30cc64052a8 100644
--- a/tests/baselines/reference/superCallAssignResult.js
+++ b/tests/baselines/reference/superCallAssignResult.js
@@ -27,6 +27,7 @@ var H = (function (_super) {
         var _this;
         var x = _this = _super.call(this, 5) || this; // Should be of type void, not E.
         x = 5;
+        return _this;
     }
     return H;
 }(E));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing1.js b/tests/baselines/reference/superCallBeforeThisAccessing1.js
index 6af4482f37196..a5d6ec18ce34e 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing1.js
@@ -36,6 +36,7 @@ var D = (function (_super) {
             t: _this._t
         };
         var i = Factory.create(s);
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing2.js b/tests/baselines/reference/superCallBeforeThisAccessing2.js
index 8ab6c5f349c25..c7a206dbbbec3 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing2.js
@@ -26,6 +26,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this, function () { _this._t; }) || this; // no error. only check when this is directly accessing in constructor
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing3.js b/tests/baselines/reference/superCallBeforeThisAccessing3.js
index f77cb96417967..185767fefb6ba 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing3.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing3.js
@@ -32,6 +32,7 @@ var D = (function (_super) {
         x(); // no error; we only check super is called before this when the container is a constructor
         _this._t; // error
         _this = _super.call(this, undefined) || this;
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing4.js b/tests/baselines/reference/superCallBeforeThisAccessing4.js
index c147b0d84ccb7..311b7ca21831b 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing4.js
@@ -27,6 +27,7 @@ var D = (function (_super) {
         var _this;
         _this._t;
         _this = _super.call(this) || this;
+        return _this;
     }
     return D;
 }(null));
@@ -36,6 +37,7 @@ var E = (function (_super) {
         var _this;
         _this = _super.call(this) || this;
         _this._t;
+        return _this;
     }
     return E;
 }(null));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing5.js b/tests/baselines/reference/superCallBeforeThisAccessing5.js
index 8fff8068ec00b..57228538faf37 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing5.js
@@ -18,6 +18,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this._t; // No error
+        return _this;
     }
     return D;
 }(null));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index 843a1d3b2cf0c..e630d539f1405 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -26,6 +26,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this, _this) || this;
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing7.js b/tests/baselines/reference/superCallBeforeThisAccessing7.js
index d6ad948a08cd9..9cfe87367741d 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing7.js
@@ -32,6 +32,7 @@ var D = (function (_super) {
             j: _this._t
         };
         _this = _super.call(this, undefined) || this;
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing8.js b/tests/baselines/reference/superCallBeforeThisAccessing8.js
index cbf0236c4cc3d..fe459b5e03147 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing8.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing8.js
@@ -32,6 +32,7 @@ var D = (function (_super) {
             k: _this = _super.call(this, undefined) || this,
             j: _this._t
         };
+        return _this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
index 6de41cb518831..2cfc0bfcbd45d 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
@@ -22,6 +22,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
index 5ae8f8b38748e..f9eeadc98e623 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
@@ -21,6 +21,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
index bc85d74c4c8c7..02bec67d7aaa2 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
@@ -27,6 +27,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.call(this, function (value) { return String(value); }) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
index a1736bb45f021..55c6ee6f4450a 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
@@ -27,6 +27,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.call(this, function (value) { return String(value); }) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
index c5beb5df5b5ba..977377e41d410 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
@@ -27,6 +27,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.call(this, function (value) { return String(value); }) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallInNonStaticMethod.js b/tests/baselines/reference/superCallInNonStaticMethod.js
index 1dd120eeb5c3e..503aee2dcc643 100644
--- a/tests/baselines/reference/superCallInNonStaticMethod.js
+++ b/tests/baselines/reference/superCallInNonStaticMethod.js
@@ -71,6 +71,7 @@ var Other = (function (_super) {
         _this.propertyInitializer = _super.prototype.instanceMethod.call(_this);
         _this.functionProperty = function () { _super.prototype.instanceMethod.call(_this); };
         _super.prototype.instanceMethod.call(_this);
+        return _this;
     }
     // in instance method
     Other.prototype.instanceMethod = function () {
diff --git a/tests/baselines/reference/superCallInsideClassDeclaration.js b/tests/baselines/reference/superCallInsideClassDeclaration.js
index f47b50d4915d4..326662abdaccf 100644
--- a/tests/baselines/reference/superCallInsideClassDeclaration.js
+++ b/tests/baselines/reference/superCallInsideClassDeclaration.js
@@ -41,9 +41,11 @@ var B = (function (_super) {
             function D() {
                 var _this;
                 _this = _super.call(this) || this;
+                return _this;
             }
             return D;
         }(C));
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallInsideClassExpression.js b/tests/baselines/reference/superCallInsideClassExpression.js
index b9e1f6c97866f..5797085726dff 100644
--- a/tests/baselines/reference/superCallInsideClassExpression.js
+++ b/tests/baselines/reference/superCallInsideClassExpression.js
@@ -41,9 +41,11 @@ var B = (function (_super) {
             function class_1() {
                 var _this;
                 _this = _super.call(this) || this;
+                return _this;
             }
             return class_1;
         }(C));
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallInsideObjectLiteralExpression.js b/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
index 68a9c19e819cb..636b03c227f89 100644
--- a/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
+++ b/tests/baselines/reference/superCallInsideObjectLiteralExpression.js
@@ -32,6 +32,7 @@ var B = (function (_super) {
         var x = {
             x: _this = _super.call(this) || this
         };
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallOutsideConstructor.js b/tests/baselines/reference/superCallOutsideConstructor.js
index 774dde7234098..65a8b435166b7 100644
--- a/tests/baselines/reference/superCallOutsideConstructor.js
+++ b/tests/baselines/reference/superCallOutsideConstructor.js
@@ -46,6 +46,7 @@ var D = (function (_super) {
         var y2 = function () {
             _this = _super.call(this) || this;
         };
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping1.js b/tests/baselines/reference/superCallParameterContextualTyping1.js
index a311ce95fc733..4e4ae47967a1b 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping1.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping1.js
@@ -30,6 +30,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping2.js b/tests/baselines/reference/superCallParameterContextualTyping2.js
index 9439871f38c28..f3a246c6389a7 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping2.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping2.js
@@ -29,6 +29,7 @@ var C = (function (_super) {
     function C() {
         var _this;
         _this = _super.call(this, function (value) { return String(value()); }) || this;
+        return _this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping3.js b/tests/baselines/reference/superCallParameterContextualTyping3.js
index d77df52ddd6cc..e7b8b355108d8 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping3.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping3.js
@@ -62,6 +62,7 @@ var C = (function (_super) {
                 p.length;
             }
         });
+        return _this;
     }
     return C;
 }(CBase));
diff --git a/tests/baselines/reference/superCalls.js b/tests/baselines/reference/superCalls.js
index 33127da64375d..2fe7712ce68ce 100644
--- a/tests/baselines/reference/superCalls.js
+++ b/tests/baselines/reference/superCalls.js
@@ -53,6 +53,7 @@ var Derived = (function (_super) {
         //type of super call expression is void
         var p = _this = _super.call(this, '') || this;
         var p = v();
+        return _this;
     }
     return Derived;
 }(Base));
@@ -67,6 +68,7 @@ var OtherDerived = (function (_super) {
         var _this;
         var p = '';
         _this = _super.call(this) || this;
+        return _this;
     }
     return OtherDerived;
 }(OtherBase));
diff --git a/tests/baselines/reference/superCallsInConstructor.js b/tests/baselines/reference/superCallsInConstructor.js
index be34657a0c1db..48b79acadf4dc 100644
--- a/tests/baselines/reference/superCallsInConstructor.js
+++ b/tests/baselines/reference/superCallsInConstructor.js
@@ -51,6 +51,7 @@ var Derived = (function (_super) {
         catch (e) {
             _this = _super.call(this) || this;
         }
+        return _this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/superErrors.js b/tests/baselines/reference/superErrors.js
index 2e68370fc32a4..93676c5d8f3e9 100644
--- a/tests/baselines/reference/superErrors.js
+++ b/tests/baselines/reference/superErrors.js
@@ -93,6 +93,7 @@ var RegisteredUser = (function (_super) {
             var _this = this;
             return function () { return _super.; };
         })();
+        return _this;
     }
     RegisteredUser.prototype.sayHello = function () {
         // super call in a method
diff --git a/tests/baselines/reference/superInConstructorParam1.js b/tests/baselines/reference/superInConstructorParam1.js
index 56e40b65e1092..7519a8253ecb9 100644
--- a/tests/baselines/reference/superInConstructorParam1.js
+++ b/tests/baselines/reference/superInConstructorParam1.js
@@ -29,6 +29,7 @@ var C = (function (_super) {
     function C(a) {
         var _this;
         if (a === void 0) { a = _super.foo.call(_this); }
+        return _this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/superInLambdas.js b/tests/baselines/reference/superInLambdas.js
index 5a1f48f382645..9b4d956dc5a24 100644
--- a/tests/baselines/reference/superInLambdas.js
+++ b/tests/baselines/reference/superInLambdas.js
@@ -92,6 +92,7 @@ var RegisteredUser = (function (_super) {
         _super.prototype.sayHello.call(_this);
         // super call in a lambda in a constructor 
         var x = function () { return _super.prototype.sayHello.call(_this); };
+        return _this;
     }
     RegisteredUser.prototype.sayHello = function () {
         var _this = this;
@@ -110,6 +111,7 @@ var RegisteredUser2 = (function (_super) {
         _this.name = "Joe";
         // super call in a nested lambda in a constructor 
         var x = function () { return function () { return function () { return _super.prototype.sayHello.call(_this); }; }; };
+        return _this;
     }
     RegisteredUser2.prototype.sayHello = function () {
         var _this = this;
@@ -126,6 +128,7 @@ var RegisteredUser3 = (function (_super) {
         _this.name = "Sam";
         // super property in a nested lambda in a constructor 
         var superName = function () { return function () { return function () { return _super.prototype.name; }; }; };
+        return _this;
     }
     RegisteredUser3.prototype.sayHello = function () {
         var _this = this;
@@ -142,6 +145,7 @@ var RegisteredUser4 = (function (_super) {
         _this.name = "Mark";
         // super in a nested lambda in a constructor 
         var x = function () { return function () { return _super.prototype.; }; };
+        return _this;
     }
     RegisteredUser4.prototype.sayHello = function () {
         var _this = this;
diff --git a/tests/baselines/reference/superNewCall1.js b/tests/baselines/reference/superNewCall1.js
index 32c4da4d4e4ed..30b07308bb25f 100644
--- a/tests/baselines/reference/superNewCall1.js
+++ b/tests/baselines/reference/superNewCall1.js
@@ -29,6 +29,7 @@ var B = (function (_super) {
     function B() {
         var _this;
         new _super.prototype(function (value) { return String(value); });
+        return _this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superPropertyAccess1.js b/tests/baselines/reference/superPropertyAccess1.js
index c986580657033..b6559a63a983a 100644
--- a/tests/baselines/reference/superPropertyAccess1.js
+++ b/tests/baselines/reference/superPropertyAccess1.js
@@ -54,6 +54,7 @@ var D = (function (_super) {
         _this = _super.call(this) || this;
         _super.prototype.bar.call(_this);
         _super.prototype.x; // error
+        return _this;
     }
     D.prototype.foo = function () {
         _super.prototype.bar.call(this);
diff --git a/tests/baselines/reference/superPropertyAccess2.js b/tests/baselines/reference/superPropertyAccess2.js
index df6e08177cb3f..eded4e74a7f5f 100644
--- a/tests/baselines/reference/superPropertyAccess2.js
+++ b/tests/baselines/reference/superPropertyAccess2.js
@@ -54,6 +54,7 @@ var D = (function (_super) {
         _this = _super.call(this) || this;
         _super.prototype.bar.call(_this); // error
         _super.prototype.x; // error
+        return _this;
     }
     D.foo = function () {
         _super.bar.call(this); // OK
diff --git a/tests/baselines/reference/superPropertyAccessNoError.js b/tests/baselines/reference/superPropertyAccessNoError.js
index d8dda26288c0e..2ba460d18f730 100644
--- a/tests/baselines/reference/superPropertyAccessNoError.js
+++ b/tests/baselines/reference/superPropertyAccessNoError.js
@@ -103,6 +103,7 @@ var SomeDerivedClass = (function (_super) {
         _this = _super.call(this) || this;
         var x = _super.prototype.func.call(_this);
         var x;
+        return _this;
     }
     SomeDerivedClass.prototype.fn = function () {
         var _this = this;
diff --git a/tests/baselines/reference/superPropertyAccess_ES5.js b/tests/baselines/reference/superPropertyAccess_ES5.js
index 1d2ab4c2a3f1b..011c5129e9f1c 100644
--- a/tests/baselines/reference/superPropertyAccess_ES5.js
+++ b/tests/baselines/reference/superPropertyAccess_ES5.js
@@ -53,6 +53,7 @@ var MyDerived = (function (_super) {
         _this = _super.call(this) || this;
         var f1 = _super.prototype.getValue.call(_this);
         var f2 = _super.prototype.value;
+        return _this;
     }
     return MyDerived;
 }(MyBase));
diff --git a/tests/baselines/reference/superWithGenericSpecialization.js b/tests/baselines/reference/superWithGenericSpecialization.js
index 499c0a6de1fd0..1152399e6eba4 100644
--- a/tests/baselines/reference/superWithGenericSpecialization.js
+++ b/tests/baselines/reference/superWithGenericSpecialization.js
@@ -30,6 +30,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this; // uses the type parameter type of the base class, ie string
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithGenerics.js b/tests/baselines/reference/superWithGenerics.js
index 471c7cd36acfa..f2580d30c5f48 100644
--- a/tests/baselines/reference/superWithGenerics.js
+++ b/tests/baselines/reference/superWithGenerics.js
@@ -22,6 +22,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _this = _super.call(this) || this;
+        return _this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superWithTypeArgument.js b/tests/baselines/reference/superWithTypeArgument.js
index cc46fa968969a..a1c0497540442 100644
--- a/tests/baselines/reference/superWithTypeArgument.js
+++ b/tests/baselines/reference/superWithTypeArgument.js
@@ -25,6 +25,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _super.prototype..call(_this);
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithTypeArgument2.js b/tests/baselines/reference/superWithTypeArgument2.js
index 4b5176bed9630..42a0e46d4c03e 100644
--- a/tests/baselines/reference/superWithTypeArgument2.js
+++ b/tests/baselines/reference/superWithTypeArgument2.js
@@ -25,6 +25,7 @@ var D = (function (_super) {
     function D(x) {
         var _this;
         _super.prototype..call(_this, x);
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithTypeArgument3.js b/tests/baselines/reference/superWithTypeArgument3.js
index aa70803de4dfe..803e5c264c22a 100644
--- a/tests/baselines/reference/superWithTypeArgument3.js
+++ b/tests/baselines/reference/superWithTypeArgument3.js
@@ -30,6 +30,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         _super.prototype..call(_this);
+        return _this;
     }
     D.prototype.bar = function () {
         _super.prototype.bar.call(this, null);
diff --git a/tests/baselines/reference/targetTypeBaseCalls.js b/tests/baselines/reference/targetTypeBaseCalls.js
index a9bbc34123fbe..a08380b173fb1 100644
--- a/tests/baselines/reference/targetTypeBaseCalls.js
+++ b/tests/baselines/reference/targetTypeBaseCalls.js
@@ -37,6 +37,7 @@ var Bar = (function (_super) {
     function Bar() {
         var _this;
         _this = _super.call(this, function (s) { s = 5; }) || this;
+        return _this;
     }
     return Bar;
 }(Foo)); // error, if types are applied correctly
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 218ebfb168672..10629d579bac2 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -72,6 +72,7 @@ var ClassWithNoInitializer = (function (_super) {
     function ClassWithNoInitializer() {
         var _this;
         _this = _super.call(this, _this) || this; // Error
+        return _this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -82,6 +83,7 @@ var ClassWithInitializer = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // Error
         _this.t = 4;
+        return _this;
     }
     return ClassWithInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index c14f71ac0b68d..444952fea3fb3 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -73,6 +73,7 @@ var ClassWithNoInitializer = (function (_super) {
     function ClassWithNoInitializer() {
         var _this;
         _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        return _this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
@@ -83,6 +84,7 @@ var ClassWithInitializer = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // Error
         _this.t = 4;
+        return _this;
     }
     return ClassWithInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index cf64eebced18e..f9d9f8694c95f 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -38,6 +38,7 @@ var Foo = (function (_super) {
     function Foo() {
         var _this;
         _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        return _this;
     }
     return Foo;
 }(Base));
@@ -47,6 +48,7 @@ var Foo2 = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // error
         _this.p = 0;
+        return _this;
     }
     return Foo2;
 }(Base));
@@ -56,6 +58,7 @@ var Foo3 = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // error
         _this.p = p;
+        return _this;
     }
     return Foo3;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall1.js b/tests/baselines/reference/thisInSuperCall1.js
index eba933d98933a..3185e42dab692 100644
--- a/tests/baselines/reference/thisInSuperCall1.js
+++ b/tests/baselines/reference/thisInSuperCall1.js
@@ -27,6 +27,7 @@ var Foo = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this;
         _this.x = x;
+        return _this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index ed6baabb4086e..b9f7571868a88 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -35,6 +35,7 @@ var Foo = (function (_super) {
     function Foo() {
         var _this;
         _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        return _this;
     }
     return Foo;
 }(Base));
@@ -44,6 +45,7 @@ var Foo2 = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this; // error
         _this.x = 0;
+        return _this;
     }
     return Foo2;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall3.js b/tests/baselines/reference/thisInSuperCall3.js
index d705d5fa7e09c..309ebf934070a 100644
--- a/tests/baselines/reference/thisInSuperCall3.js
+++ b/tests/baselines/reference/thisInSuperCall3.js
@@ -29,6 +29,7 @@ var Foo = (function (_super) {
         var _this;
         _this = _super.call(this, _this) || this;
         _this.x = 0;
+        return _this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/tsxDynamicTagName5.js b/tests/baselines/reference/tsxDynamicTagName5.js
index 76b79dbc7dccc..307cd0fca93db 100644
--- a/tests/baselines/reference/tsxDynamicTagName5.js
+++ b/tests/baselines/reference/tsxDynamicTagName5.js
@@ -33,6 +33,7 @@ var Text = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
+        return _this;
     }
     Text.prototype.render = function () {
         return (<this._tagName />);
diff --git a/tests/baselines/reference/tsxDynamicTagName7.js b/tests/baselines/reference/tsxDynamicTagName7.js
index c55ceb100eab5..39e30b6ba387d 100644
--- a/tests/baselines/reference/tsxDynamicTagName7.js
+++ b/tests/baselines/reference/tsxDynamicTagName7.js
@@ -33,6 +33,7 @@ var Text = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
+        return _this;
     }
     Text.prototype.render = function () {
         return (<this /> // this should be an error
diff --git a/tests/baselines/reference/tsxDynamicTagName8.js b/tests/baselines/reference/tsxDynamicTagName8.js
index 57ce2becbad13..77423709347da 100644
--- a/tests/baselines/reference/tsxDynamicTagName8.js
+++ b/tests/baselines/reference/tsxDynamicTagName8.js
@@ -33,6 +33,7 @@ var Text = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
+        return _this;
     }
     Text.prototype.render = function () {
         return (<this._tagName> Hello world </this._tagName>);
diff --git a/tests/baselines/reference/tsxDynamicTagName9.js b/tests/baselines/reference/tsxDynamicTagName9.js
index 1bc14eb32eec3..6b5d130c0b403 100644
--- a/tests/baselines/reference/tsxDynamicTagName9.js
+++ b/tests/baselines/reference/tsxDynamicTagName9.js
@@ -33,6 +33,7 @@ var Text = (function (_super) {
         var _this;
         _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
+        return _this;
     }
     Text.prototype.render = function () {
         return (<this._tagName> Hello world </this._tagName>);
diff --git a/tests/baselines/reference/typeGuardOfFormThisMember.js b/tests/baselines/reference/typeGuardOfFormThisMember.js
index fefb1e7ff3832..3995ffd447cd3 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMember.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMember.js
@@ -121,6 +121,7 @@ var Test;
             var _this;
             _this = _super.call(this, path) || this;
             _this.content = content;
+            return _this;
         }
         return File;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
index ed53a308808c8..14807ddd88c31 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
@@ -71,6 +71,7 @@ var Test;
             var _this;
             _this = _super.call(this, path) || this;
             _this.content = content;
+            return _this;
         }
         return File;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeOfSuperCall.js b/tests/baselines/reference/typeOfSuperCall.js
index 70ace4becb416..179e981b8d1dc 100644
--- a/tests/baselines/reference/typeOfSuperCall.js
+++ b/tests/baselines/reference/typeOfSuperCall.js
@@ -24,6 +24,7 @@ var D = (function (_super) {
     function D() {
         var _this;
         var x = _this = _super.call(this) || this;
+        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/typeRelationships.js b/tests/baselines/reference/typeRelationships.js
index 87f0f60c53f30..eee995686380d 100644
--- a/tests/baselines/reference/typeRelationships.js
+++ b/tests/baselines/reference/typeRelationships.js
@@ -78,6 +78,7 @@ var D = (function (_super) {
         _this.self2 = _this.self;
         _this.self3 = _this.foo();
         _this.d = new D();
+        return _this;
     }
     D.prototype.bar = function () {
         this.self = this.self1;
diff --git a/tests/baselines/reference/unknownSymbols1.js b/tests/baselines/reference/unknownSymbols1.js
index 46ee4ed02d5cb..2c2b3ded1b562 100644
--- a/tests/baselines/reference/unknownSymbols1.js
+++ b/tests/baselines/reference/unknownSymbols1.js
@@ -65,6 +65,7 @@ var C4 = (function (_super) {
     function C4() {
         var _this;
         _this = _super.call(this, asdf) || this;
+        return _this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/unspecializedConstraints.js b/tests/baselines/reference/unspecializedConstraints.js
index 06d2c4bd6a51b..02927bf558d04 100644
--- a/tests/baselines/reference/unspecializedConstraints.js
+++ b/tests/baselines/reference/unspecializedConstraints.js
@@ -239,6 +239,7 @@ var ts;
             _this.name = name;
             _this.type = type;
             _this.flags = flags;
+            return _this;
         }
         Property.prototype.equals = function (other) {
             return this.name === other.name &&
@@ -260,6 +261,7 @@ var ts;
             _this.typeParameters = typeParameters;
             _this.parameters = parameters;
             _this.returnType = returnType;
+            return _this;
         }
         Signature.prototype.equalsNoReturn = function (other) {
             return this.parameters.length === other.parameters.length &&
@@ -281,6 +283,7 @@ var ts;
             _this.name = name;
             _this.type = type;
             _this.flags = flags;
+            return _this;
         }
         Parameter.prototype.equals = function (other) {
             return this.name === other.name &&
diff --git a/tests/baselines/reference/validUseOfThisInSuper.js b/tests/baselines/reference/validUseOfThisInSuper.js
index 96802932f12fa..3a05ff12ee8d0 100644
--- a/tests/baselines/reference/validUseOfThisInSuper.js
+++ b/tests/baselines/reference/validUseOfThisInSuper.js
@@ -26,6 +26,7 @@ var Super = (function (_super) {
     function Super() {
         var _this;
         _this = _super.call(this, (function () { return _this; })()) || this; // ok since this is not the case: The constructor declares parameter properties or the containing class declares instance member variables with initializers.
+        return _this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/varArgsOnConstructorTypes.js b/tests/baselines/reference/varArgsOnConstructorTypes.js
index 04eaa58a1968e..9c1c8f8c29d88 100644
--- a/tests/baselines/reference/varArgsOnConstructorTypes.js
+++ b/tests/baselines/reference/varArgsOnConstructorTypes.js
@@ -45,6 +45,7 @@ define(["require", "exports"], function (require, exports) {
             _this = _super.call(this, element) || this;
             _this.p1 = element;
             _this.p2 = url;
+            return _this;
         }
         return B;
     }(A));

From bab6d6fbb23f28831b4b990ad4c2cc9755240374 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 13:03:46 -0700
Subject: [PATCH 08/39] Ensure prologue directives occur first.

---
 src/compiler/transformers/es6.ts | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 886ee1b8e40d8..8890ac60173ed 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -774,10 +774,22 @@ namespace ts {
          * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
          *                            synthesized `super` call.
          */
-        function transformConstructorBody(constructor: ConstructorDeclaration, node: ClassDeclaration | ClassExpression, extendsClauseElement: ExpressionWithTypeArguments, hasSynthesizedSuper: boolean) {
+        function transformConstructorBody(constructor: ConstructorDeclaration | undefined, node: ClassDeclaration | ClassExpression, extendsClauseElement: ExpressionWithTypeArguments, hasSynthesizedSuper: boolean) {
             const statements: Statement[] = [];
             startLexicalEnvironment();
 
+            let statementOffset = -1;
+            if (hasSynthesizedSuper) {
+                // If a super call has already been synthesized,
+                // we're going to assume that we should just transform everything after that.
+                // The assumption is that no prior step in the pipeline has added any prologue directives.
+                statementOffset = 1;
+            }
+            else if (constructor) {
+                // Otherwise, try to emit all potential prologue directives first.
+                statementOffset = addPrologueDirectives(statements, constructor.body.statements, /*ensureUseStrict*/ false, visitor);
+            }
+
             if (constructor) {
                 declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement);
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
@@ -787,9 +799,11 @@ namespace ts {
             addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
 
             if (constructor) {
-                const body = saveStateAndInvoke(constructor, hasSynthesizedSuper ? transformConstructorBodyWithSynthesizedSuper : transformConstructorBodyWithoutSynthesizedSuper);
+                Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
+                const body = saveStateAndInvoke(constructor, makeTransformerForConstructorBodyAtOffset(statementOffset));
                 addRange(statements, body);
             }
+
             if (extendsClauseElement) {
                 statements.push(
                     createReturn(
@@ -815,12 +829,8 @@ namespace ts {
             return block;
         }
 
-        function transformConstructorBodyWithSynthesizedSuper(node: ConstructorDeclaration) {
-            return visitNodes(node.body.statements, visitor, isStatement, /*start*/ 1);
-        }
-
-        function transformConstructorBodyWithoutSynthesizedSuper(node: ConstructorDeclaration) {
-            return visitNodes(node.body.statements, visitor, isStatement, /*start*/ 0);
+        function makeTransformerForConstructorBodyAtOffset(offset: number): (c: ConstructorDeclaration) => NodeArray<Statement> {
+            return constructor => visitNodes(constructor.body.statements, visitor, isStatement, /*start*/ offset);
         }
 
         /**

From ce953ceb4569f0c93cda7dc55c46fe4867233bdc Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 13:04:14 -0700
Subject: [PATCH 09/39] Accepted baselines.

---
 .../emitSuperCallBeforeEmitParameterPropertyDeclaration1.js   | 2 +-
 .../reference/emitSuperCallBeforeEmitPropertyDeclaration1.js  | 2 +-
 ...EmitPropertyDeclarationAndParameterPropertyDeclaration1.js | 2 +-
 tests/baselines/reference/strictModeInConstructor.js          | 4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
index b95263464a75c..efed8e66a155c 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
@@ -28,9 +28,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
-        var _this;
         "use strict";
         'someStringForEgngInject';
+        var _this;
         _this = _super.call(this) || this;
         _this.x = x;
         return _this;
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
index f078c448b7549..6e3d3bfaa1b70 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
@@ -30,9 +30,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
         "use strict";
         'someStringForEgngInject';
+        var _this;
         _this = _super.call(this) || this;
         _this.blub = 12;
         return _this;
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
index e64af9ef86240..6559569fe79b4 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
@@ -28,9 +28,9 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
-        var _this;
         "use strict";
         'someStringForEgngInject';
+        var _this;
         _this = _super.call(this) || this;
         _this.x = x;
         _this.blah = 2;
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index 4e1c483f1c192..1c33f16a3c67b 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -74,8 +74,8 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
         "use strict"; // No error
+        var _this;
         _this = _super.call(this) || this;
         _this.s = 9;
         return _this;
@@ -108,8 +108,8 @@ var D = (function (_super) {
 var Bs = (function (_super) {
     __extends(Bs, _super);
     function Bs() {
-        var _this;
         "use strict"; // No error
+        var _this;
         _this = _super.call(this) || this;
         return _this;
     }

From d6e548b02e3546b70c656fb79e364b1e0cb77bdf Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Fri, 2 Sep 2016 20:04:43 -0700
Subject: [PATCH 10/39] Consolidate '_this' declaration and assignments for
 first statements in constructors.

---
 src/compiler/transformers/es6.ts | 68 +++++++++++++++++++++++++++-----
 1 file changed, 58 insertions(+), 10 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 8890ac60173ed..9b703e5ddc4c5 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -791,7 +791,8 @@ namespace ts {
             }
 
             if (constructor) {
-                declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement);
+                Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
+                statementOffset = declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
             }
@@ -799,7 +800,6 @@ namespace ts {
             addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
 
             if (constructor) {
-                Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
                 const body = saveStateAndInvoke(constructor, makeTransformerForConstructorBodyAtOffset(statementOffset));
                 addRange(statements, body);
             }
@@ -1118,13 +1118,49 @@ namespace ts {
             statements.push(forStatement);
         }
 
-        function declareOrCaptureThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean) {
+        /**
+         * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
+         *
+         * @returns The new statement offset into the `statements` array.
+         */
+        function declareOrCaptureThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, firstNonPrologue: number) {
             if (hasExtendsClause) {
-                captureThisForNode(statements, ctor, /*initializer*/ undefined);
+                // Most of the time, a 'super' call will be the first real statement in a constructor body.
+                // In these cases, we'd like to transform these into a *single* statement instead of a declaration
+                // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
+                // we'd get:
+                //
+                //      var _this;
+                //      _this = super();
+                //
+                // instead of
+                //
+                //      var _this = super();
+                //
+                let initializer: Expression = undefined;
+                let firstStatement: Statement;
+                if (firstNonPrologue < ctor.body.statements.length) {
+                    firstStatement = ctor.body.statements[firstNonPrologue];
+
+                    if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
+                        initializer = setOriginalNode(
+                            visitImmediateSuperCallInBody(((firstStatement as ExpressionStatement).expression as CallExpression)),
+                            (firstStatement as ExpressionStatement).expression
+                        );
+                    }
+                }
+                captureThisForNode(statements, ctor, /*initializer*/ initializer, firstStatement);
+
+                // We're actually skipping an extra statement. Signal this to the caller.
+                if (initializer) {
+                    return firstNonPrologue + 1;
+                }
             }
             else {
                 addCaptureThisForNodeIfNeeded(statements, ctor);
             }
+
+            return firstNonPrologue;
         }
 
         /**
@@ -1139,7 +1175,9 @@ namespace ts {
             }
         }
 
-        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined) {
+        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined): void;
+        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined, originalStatement: Statement): void;
+        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined, originalStatement?: Statement): void {
             enableSubstitutionsForCapturedThis();
             const captureThisStatement = createVariableStatement(
                 /*modifiers*/ undefined,
@@ -1149,7 +1187,8 @@ namespace ts {
                         /*type*/ undefined,
                         initializer
                     )
-                ])
+                ]),
+                originalStatement
             );
 
             setNodeEmitFlags(captureThisStatement, NodeEmitFlags.NoComments | NodeEmitFlags.CustomPrologue);
@@ -2520,7 +2559,15 @@ namespace ts {
          *
          * @param node a CallExpression.
          */
-        function visitCallExpression(node: CallExpression): CallExpression | BinaryExpression {
+        function visitCallExpression(node: CallExpression) {
+            return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ true);
+        }
+
+        function visitImmediateSuperCallInBody(node: CallExpression) {
+            return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ false);
+        }
+
+        function visitCallExpressionWithPotentialCapturedThisAssignment(node: CallExpression, assignToCapturedThis: boolean): CallExpression | BinaryExpression {
             // We are here either because SuperKeyword was used somewhere in the expression, or
             // because we contain a SpreadElementExpression.
 
@@ -2572,13 +2619,14 @@ namespace ts {
             if (node.expression.kind === SyntaxKind.SuperKeyword) {
                 const actualThis = createThis();
                 setNodeEmitFlags(actualThis, NodeEmitFlags.NoSubstitution);
-                return createAssignment(
-                    createIdentifier("_this"),
+                const initializer =
                     createLogicalOr(
                         resultingCall,
                         actualThis
                     )
-                );
+                return assignToCapturedThis
+                    ? createAssignment(createIdentifier("_this"), initializer)
+                    : initializer
             }
             return resultingCall;
         }

From 11bc6c470f5dd09dc83fbf8ac269f0c8bc023ad0 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 00:16:43 -0700
Subject: [PATCH 11/39] Fixed issue where last function context & parent node
 wasn't being preserved.

This came up when a `super()` call was nested in another constructor body.
Current logic in the transform says that if the last containing non-arrow
function body is non-static, and the current parent isn't a call expression,
the call target of a `super` call will become `_super.prototype` instead
of `super`.

If the state is not saved, the containing arrow function and parent
are not saved, and the information for this check won't be accurate.
---
 src/compiler/transformers/es6.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 9b703e5ddc4c5..85838112fc313 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -1143,9 +1143,10 @@ namespace ts {
                     firstStatement = ctor.body.statements[firstNonPrologue];
 
                     if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
+                        const superCall = (firstStatement as ExpressionStatement).expression as CallExpression;
                         initializer = setOriginalNode(
-                            visitImmediateSuperCallInBody(((firstStatement as ExpressionStatement).expression as CallExpression)),
-                            (firstStatement as ExpressionStatement).expression
+                            saveStateAndInvoke(superCall, visitImmediateSuperCallInBody),
+                            superCall
                         );
                     }
                 }

From d8846dd495d03697ee598d6c887f55eac61789ef Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 00:26:02 -0700
Subject: [PATCH 12/39] Accepted baselines.

---
 tests/baselines/reference/abstractProperty.js |   3 +-
 .../reference/abstractPropertyNegative.js     |   9 +-
 .../accessOverriddenBaseClassMember1.js       |   3 +-
 ...aliasUsageInTypeArgumentOfExtendsClause.js |   3 +-
 .../reference/arrowFunctionContexts.js        |   6 +-
 .../reference/assignmentLHSIsValue.js         |   3 +-
 tests/baselines/reference/autolift4.js        |   3 +-
 tests/baselines/reference/baseCheck.js        |  15 +-
 .../reference/bestCommonTypeOfTuple2.js       |   3 +-
 tests/baselines/reference/callWithSpread.js   |   3 +-
 .../reference/captureThisInSuperCall.js       |   3 +-
 .../reference/checkForObjectTooStrict.js      |   6 +-
 .../checkSuperCallBeforeThisAccessing1.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing5.js     |   3 +-
 .../checkSuperCallBeforeThisAccessing7.js     |   3 +-
 .../classConstructorAccessibility2.js         |   9 +-
 ...classConstructorParametersAccessibility.js |   3 +-
 ...lassConstructorParametersAccessibility2.js |   3 +-
 ...lassConstructorParametersAccessibility3.js |   3 +-
 tests/baselines/reference/classExpression3.js |   6 +-
 .../reference/classExtendingClassLikeType.js  |   9 +-
 tests/baselines/reference/classExtendsNull.js |   3 +-
 .../reference/classSideInheritance2.js        |   3 +-
 .../reference/classSideInheritance3.js        |   6 +-
 tests/baselines/reference/classUpdateTests.js |  15 +-
 ...isionSuperAndLocalFunctionInConstructor.js |   6 +-
 ...ollisionSuperAndLocalFunctionInProperty.js |   3 +-
 .../collisionSuperAndLocalVarInConstructor.js |   6 +-
 .../collisionSuperAndLocalVarInProperty.js    |   3 +-
 .../reference/collisionSuperAndParameter.js   |   6 +-
 ...perAndPropertyNameAsConstuctorParameter.js |  12 +-
 .../reference/commentsInheritance.js          |   3 +-
 .../reference/compoundAssignmentLHSIsValue.js |   3 +-
 ...poundExponentiationAssignmentLHSIsValue.js |   3 +-
 .../reference/computedPropertyNames28_ES5.js  |   3 +-
 .../reference/computedPropertyNames30_ES5.js  |   3 +-
 tests/baselines/reference/constructorArgs.js  |   3 +-
 ...ctorFunctionTypeIsAssignableToBaseType2.js |   6 +-
 .../reference/constructorOverloads2.js        |   3 +-
 .../reference/declFileGenericType2.js         |   6 +-
 .../reference/decoratorOnClassConstructor2.js |   3 +-
 .../reference/decoratorOnClassConstructor3.js |   3 +-
 .../derivedClassOverridesPrivateFunction1.js  |   3 +-
 .../derivedClassOverridesProtectedMembers.js  |   3 +-
 .../derivedClassOverridesProtectedMembers2.js |   3 +-
 .../derivedClassOverridesProtectedMembers3.js |  30 ++--
 .../derivedClassOverridesPublicMembers.js     |   3 +-
 .../derivedClassParameterProperties.js        |  12 +-
 ...dClassSuperCallsInNonConstructorMembers.js |   3 +-
 .../derivedClassSuperCallsWithThisArg.js      |  12 +-
 .../derivedClassWithoutExplicitConstructor.js |   6 +-
 ...derivedClassWithoutExplicitConstructor2.js |   6 +-
 ...derivedClassWithoutExplicitConstructor3.js |  12 +-
 .../destructuringParameterDeclaration5.js     |   6 +-
 ...BeforeEmitParameterPropertyDeclaration1.js |   3 +-
 ...SuperCallBeforeEmitPropertyDeclaration1.js |   3 +-
 ...arationAndParameterPropertyDeclaration1.js |   3 +-
 tests/baselines/reference/errorSuperCalls.js  |   3 +-
 .../reference/errorSuperPropertyAccess.js     |   6 +-
 tests/baselines/reference/es6ClassTest.js     |   3 +-
 tests/baselines/reference/es6ClassTest2.js    |   3 +-
 ...cClassPropertyInheritanceSpecialization.js |   3 +-
 ...genericConstraintOnExtendedBuiltinTypes.js |   3 +-
 ...enericConstraintOnExtendedBuiltinTypes2.js |   3 +-
 ...ericRecursiveImplicitConstructorErrors3.js |   3 +-
 .../reference/genericTypeConstraints.js       |   3 +-
 .../interfaceExtendsClassWithPrivate2.js      |   6 +-
 tests/baselines/reference/lift.js             |   3 +-
 .../missingPropertiesOfClassExpression.js     |   3 +-
 ...objectCreationOfElementAccessExpression.js |  18 +--
 tests/baselines/reference/optionalMethods.js  |   3 +-
 .../reference/optionalParamArgsTest.js        |   3 +-
 .../reference/optionalParameterProperty.js    |   3 +-
 .../overloadOnConstConstraintChecks4.js       |   3 +-
 tests/baselines/reference/parserAstSpans1.js  |   6 +-
 .../baselines/reference/parserRealSource10.js |  18 +--
 .../baselines/reference/parserRealSource11.js | 144 ++++++------------
 tests/baselines/reference/parserharness.js    |   9 +-
 .../privateInstanceMemberAccessibility.js     |   3 +-
 .../privateStaticMemberAccessibility.js       |   3 +-
 .../readonlyConstructorAssignment.js          |   9 +-
 .../reference/returnInConstructor1.js         |   6 +-
 tests/baselines/reference/scopeTests.js       |   3 +-
 ...sWithDefaultConstructorAndExtendsClause.js |   3 +-
 ...hDefaultConstructorAndExtendsClause.js.map |   2 +-
 ...tConstructorAndExtendsClause.sourcemap.txt |  54 ++++---
 .../baselines/reference/staticInheritance.js  |   3 +-
 .../reference/strictModeInConstructor.js      |  12 +-
 tests/baselines/reference/superAccess2.js     |   3 +-
 .../reference/superCallArgsMustMatch.js       |   4 +-
 .../superCallBeforeThisAccessing1.js          |   3 +-
 .../superCallBeforeThisAccessing2.js          |   3 +-
 .../superCallBeforeThisAccessing4.js          |   3 +-
 .../superCallBeforeThisAccessing6.js          |   3 +-
 ...allFromClassThatDerivesFromGenericType1.js |   3 +-
 ...allFromClassThatDerivesFromGenericType2.js |   3 +-
 ...eButWithIncorrectNumberOfTypeArguments1.js |   3 +-
 ...sFromGenericTypeButWithNoTypeArguments1.js |   3 +-
 ...ivesNonGenericTypeButWithTypeArguments1.js |   3 +-
 .../reference/superCallInNonStaticMethod.js   |   3 +-
 .../superCallInsideClassDeclaration.js        |   3 +-
 .../superCallInsideClassExpression.js         |   3 +-
 .../reference/superCallOutsideConstructor.js  |   3 +-
 .../superCallParameterContextualTyping1.js    |   3 +-
 .../superCallParameterContextualTyping2.js    |   3 +-
 .../superCallParameterContextualTyping3.js    |   4 +-
 tests/baselines/reference/superCalls.js       |   3 +-
 tests/baselines/reference/superErrors.js      |   3 +-
 tests/baselines/reference/superInLambdas.js   |  12 +-
 .../reference/superPropertyAccess1.js         |   3 +-
 .../reference/superPropertyAccess2.js         |   3 +-
 .../reference/superPropertyAccessNoError.js   |   3 +-
 .../reference/superPropertyAccess_ES5.js      |   3 +-
 .../superWithGenericSpecialization.js         |   3 +-
 .../baselines/reference/superWithGenerics.js  |   3 +-
 .../reference/targetTypeBaseCalls.js          |   3 +-
 .../reference/thisInInvalidContexts.js        |   6 +-
 .../thisInInvalidContextsExternalModule.js    |   6 +-
 tests/baselines/reference/thisInSuperCall.js  |   9 +-
 tests/baselines/reference/thisInSuperCall1.js |   3 +-
 tests/baselines/reference/thisInSuperCall2.js |   6 +-
 tests/baselines/reference/thisInSuperCall3.js |   3 +-
 .../baselines/reference/tsxDynamicTagName5.js |   3 +-
 .../baselines/reference/tsxDynamicTagName7.js |   3 +-
 .../baselines/reference/tsxDynamicTagName8.js |   3 +-
 .../baselines/reference/tsxDynamicTagName9.js |   3 +-
 .../reference/typeGuardOfFormThisMember.js    |   3 +-
 .../typeGuardOfFormThisMemberErrors.js        |   3 +-
 .../baselines/reference/typeRelationships.js  |   3 +-
 tests/baselines/reference/unknownSymbols1.js  |   3 +-
 .../reference/unspecializedConstraints.js     |   9 +-
 .../reference/validUseOfThisInSuper.js        |   3 +-
 .../reference/varArgsOnConstructorTypes.js    |   3 +-
 133 files changed, 285 insertions(+), 541 deletions(-)

diff --git a/tests/baselines/reference/abstractProperty.js b/tests/baselines/reference/abstractProperty.js
index 292213ead5398..fb7deaa09ddbc 100644
--- a/tests/baselines/reference/abstractProperty.js
+++ b/tests/baselines/reference/abstractProperty.js
@@ -35,8 +35,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.raw = "edge";
         _this.ro = "readonly please";
         return _this;
diff --git a/tests/baselines/reference/abstractPropertyNegative.js b/tests/baselines/reference/abstractPropertyNegative.js
index 28ada310ef426..5a4c24fe2333f 100644
--- a/tests/baselines/reference/abstractPropertyNegative.js
+++ b/tests/baselines/reference/abstractPropertyNegative.js
@@ -57,8 +57,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.ro = "readonly please";
         return _this;
     }
@@ -79,8 +78,7 @@ var WrongTypeProperty = (function () {
 var WrongTypePropertyImpl = (function (_super) {
     __extends(WrongTypePropertyImpl, _super);
     function WrongTypePropertyImpl() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.num = "nope, wrong";
         return _this;
     }
@@ -107,8 +105,7 @@ var WrongTypeAccessorImpl = (function (_super) {
 var WrongTypeAccessorImpl2 = (function (_super) {
     __extends(WrongTypeAccessorImpl2, _super);
     function WrongTypeAccessorImpl2() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.num = "nope, wrong";
         return _this;
     }
diff --git a/tests/baselines/reference/accessOverriddenBaseClassMember1.js b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
index 65431a2f77837..02d092dfd393f 100644
--- a/tests/baselines/reference/accessOverriddenBaseClassMember1.js
+++ b/tests/baselines/reference/accessOverriddenBaseClassMember1.js
@@ -34,8 +34,7 @@ var Point = (function () {
 var ColoredPoint = (function (_super) {
     __extends(ColoredPoint, _super);
     function ColoredPoint(x, y, color) {
-        var _this;
-        _this = _super.call(this, x, y) || this;
+        var _this = _super.call(this, x, y) || this;
         _this.color = color;
         return _this;
     }
diff --git a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
index 8af9c702654c4..91c6ca2c53f79 100644
--- a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
+++ b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
@@ -65,8 +65,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = moduleA;
         return _this;
     }
diff --git a/tests/baselines/reference/arrowFunctionContexts.js b/tests/baselines/reference/arrowFunctionContexts.js
index 660208cb0c182..1af0797b41fde 100644
--- a/tests/baselines/reference/arrowFunctionContexts.js
+++ b/tests/baselines/reference/arrowFunctionContexts.js
@@ -116,8 +116,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this, function () { return _this; }) || this;
+        var _this = _super.call(this, function () { return _this; }) || this;
         return _this;
     }
     return Derived;
@@ -159,8 +158,7 @@ var M2;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this;
-            _this = _super.call(this, function () { return _this; }) || this;
+            var _this = _super.call(this, function () { return _this; }) || this;
             return _this;
         }
         return Derived;
diff --git a/tests/baselines/reference/assignmentLHSIsValue.js b/tests/baselines/reference/assignmentLHSIsValue.js
index 52d14cbe536c3..ab3f80eff2104 100644
--- a/tests/baselines/reference/assignmentLHSIsValue.js
+++ b/tests/baselines/reference/assignmentLHSIsValue.js
@@ -118,8 +118,7 @@ value;
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype. = value;
         return _this;
     }
diff --git a/tests/baselines/reference/autolift4.js b/tests/baselines/reference/autolift4.js
index 0638efab0b39e..1c29bfeeff7f3 100644
--- a/tests/baselines/reference/autolift4.js
+++ b/tests/baselines/reference/autolift4.js
@@ -43,8 +43,7 @@ Point.origin = new Point(0, 0);
 var Point3D = (function (_super) {
     __extends(Point3D, _super);
     function Point3D(x, y, z, m) {
-        var _this;
-        _this = _super.call(this, x, y) || this;
+        var _this = _super.call(this, x, y) || this;
         _this.z = z;
         return _this;
     }
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index 832830ae8645d..623cd152b9a5d 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -43,8 +43,7 @@ var C = (function () {
 var ELoc = (function (_super) {
     __extends(ELoc, _super);
     function ELoc(x) {
-        var _this;
-        _this = _super.call(this, 0, x) || this;
+        var _this = _super.call(this, 0, x) || this;
         return _this;
     }
     return ELoc;
@@ -52,8 +51,7 @@ var ELoc = (function (_super) {
 var ELocVar = (function (_super) {
     __extends(ELocVar, _super);
     function ELocVar(x) {
-        var _this;
-        _this = _super.call(this, 0, loc) || this;
+        var _this = _super.call(this, 0, loc) || this;
         return _this;
     }
     ELocVar.prototype.m = function () {
@@ -64,8 +62,7 @@ var ELocVar = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D(z) {
-        var _this;
-        _this = _super.call(this, _this.z) || this;
+        var _this = _super.call(this, _this.z) || this;
         _this.z = z;
         return _this;
     }
@@ -74,8 +71,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E(z) {
-        var _this;
-        _this = _super.call(this, 0, _this.z) || this;
+        var _this = _super.call(this, 0, _this.z) || this;
         _this.z = z;
         return _this;
     }
@@ -84,8 +80,7 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F(z) {
-        var _this;
-        _this = _super.call(this, "hello", _this.z) || this;
+        var _this = _super.call(this, "hello", _this.z) || this;
         _this.z = z;
         return _this;
     }
diff --git a/tests/baselines/reference/bestCommonTypeOfTuple2.js b/tests/baselines/reference/bestCommonTypeOfTuple2.js
index 8213733b75317..d71b6f17abfd2 100644
--- a/tests/baselines/reference/bestCommonTypeOfTuple2.js
+++ b/tests/baselines/reference/bestCommonTypeOfTuple2.js
@@ -60,8 +60,7 @@ var C1 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.i = "bar";
         return _this;
     }
diff --git a/tests/baselines/reference/callWithSpread.js b/tests/baselines/reference/callWithSpread.js
index 48af58edf6505..161eb36dbcf73 100644
--- a/tests/baselines/reference/callWithSpread.js
+++ b/tests/baselines/reference/callWithSpread.js
@@ -99,8 +99,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this, 1, 2) || this;
+        var _this = _super.call(this, 1, 2) || this;
         _this = _super.apply(this, [1, 2].concat(a)) || this;
         return _this;
     }
diff --git a/tests/baselines/reference/captureThisInSuperCall.js b/tests/baselines/reference/captureThisInSuperCall.js
index 2d39722548d63..069871f598e88 100644
--- a/tests/baselines/reference/captureThisInSuperCall.js
+++ b/tests/baselines/reference/captureThisInSuperCall.js
@@ -22,8 +22,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
-        _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
+        var _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
         return _this;
     }
     B.prototype.someMethod = function () { };
diff --git a/tests/baselines/reference/checkForObjectTooStrict.js b/tests/baselines/reference/checkForObjectTooStrict.js
index 8c0cfc104d29a..156608bd6b5d7 100644
--- a/tests/baselines/reference/checkForObjectTooStrict.js
+++ b/tests/baselines/reference/checkForObjectTooStrict.js
@@ -49,8 +49,7 @@ var Foo;
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return Bar;
@@ -58,8 +57,7 @@ var Bar = (function (_super) {
 var Baz = (function (_super) {
     __extends(Baz, _super);
     function Baz() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return Baz;
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
index a54f82ab9fa00..8ced6fce50092 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing1.js
@@ -24,8 +24,7 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this;
         _this.x = 10;
         var that = _this;
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index e365678ee0cad..3174bebd11db4 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -25,8 +25,7 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this, _this.x) || this;
+        var _this = _super.call(this, _this.x) || this;
         return _this;
     }
     return Derived;
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
index 7ba43de005b23..364aed4d4b079 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
@@ -23,8 +23,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this;
-        _this = _super.call(this, (function () { return _this; })) || this; // No error
+        var _this = _super.call(this, (function () { return _this; })) || this;
         return _this;
     }
     return Super;
diff --git a/tests/baselines/reference/classConstructorAccessibility2.js b/tests/baselines/reference/classConstructorAccessibility2.js
index 8a81d469fb814..ef637611e8de8 100644
--- a/tests/baselines/reference/classConstructorAccessibility2.js
+++ b/tests/baselines/reference/classConstructorAccessibility2.js
@@ -77,8 +77,7 @@ var BaseC = (function () {
 var DerivedA = (function (_super) {
     __extends(DerivedA, _super);
     function DerivedA(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.x = x;
         return _this;
     }
@@ -90,8 +89,7 @@ var DerivedA = (function (_super) {
 var DerivedB = (function (_super) {
     __extends(DerivedB, _super);
     function DerivedB(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.x = x;
         return _this;
     }
@@ -103,8 +101,7 @@ var DerivedB = (function (_super) {
 var DerivedC = (function (_super) {
     __extends(DerivedC, _super);
     function DerivedC(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.x = x;
         return _this;
     }
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility.js b/tests/baselines/reference/classConstructorParametersAccessibility.js
index 214815f49768c..e0e75bcfeeb53 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility.js
@@ -59,8 +59,7 @@ c3.p; // protected, error
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        var _this;
-        _this = _super.call(this, p) || this;
+        var _this = _super.call(this, p) || this;
         _this.p; // OK
         return _this;
     }
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility2.js b/tests/baselines/reference/classConstructorParametersAccessibility2.js
index 7c714aa4c03e0..84da66c3e3c9c 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility2.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility2.js
@@ -59,8 +59,7 @@ c3.p; // protected, error
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        var _this;
-        _this = _super.call(this, p) || this;
+        var _this = _super.call(this, p) || this;
         _this.p; // OK
         return _this;
     }
diff --git a/tests/baselines/reference/classConstructorParametersAccessibility3.js b/tests/baselines/reference/classConstructorParametersAccessibility3.js
index 275f3920538b5..db9f94cf0fbf7 100644
--- a/tests/baselines/reference/classConstructorParametersAccessibility3.js
+++ b/tests/baselines/reference/classConstructorParametersAccessibility3.js
@@ -28,8 +28,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(p) {
-        var _this;
-        _this = _super.call(this, p) || this;
+        var _this = _super.call(this, p) || this;
         _this.p = p;
         _this.p; // OK
         return _this;
diff --git a/tests/baselines/reference/classExpression3.js b/tests/baselines/reference/classExpression3.js
index 3c53d72823353..c0376c54c27af 100644
--- a/tests/baselines/reference/classExpression3.js
+++ b/tests/baselines/reference/classExpression3.js
@@ -15,8 +15,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(class_1, _super);
     function class_1() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.c = 3;
         return _this;
     }
@@ -24,8 +23,7 @@ var C = (function (_super) {
 }((function (_super) {
     __extends(class_2, _super);
     function class_2() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.b = 2;
         return _this;
     }
diff --git a/tests/baselines/reference/classExtendingClassLikeType.js b/tests/baselines/reference/classExtendingClassLikeType.js
index 32d7fff0cbd11..fdda53a381f1b 100644
--- a/tests/baselines/reference/classExtendingClassLikeType.js
+++ b/tests/baselines/reference/classExtendingClassLikeType.js
@@ -76,8 +76,7 @@ var D0 = (function (_super) {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this;
-        _this = _super.call(this, "abc", "def") || this;
+        var _this = _super.call(this, "abc", "def") || this;
         _this.x = "x";
         _this.y = "y";
         return _this;
@@ -87,8 +86,7 @@ var D1 = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this;
-        _this = _super.call(this, 10) || this;
+        var _this = _super.call(this, 10) || this;
         _this = _super.call(this, 10, 20) || this;
         _this.x = 1;
         _this.y = 2;
@@ -99,8 +97,7 @@ var D2 = (function (_super) {
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        var _this;
-        _this = _super.call(this, "abc", 42) || this;
+        var _this = _super.call(this, "abc", 42) || this;
         _this.x = "x";
         _this.y = 2;
         return _this;
diff --git a/tests/baselines/reference/classExtendsNull.js b/tests/baselines/reference/classExtendsNull.js
index 301dee7f705a7..a820b525aabb1 100644
--- a/tests/baselines/reference/classExtendsNull.js
+++ b/tests/baselines/reference/classExtendsNull.js
@@ -21,8 +21,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return Object.create(null);
         return _this;
     }
diff --git a/tests/baselines/reference/classSideInheritance2.js b/tests/baselines/reference/classSideInheritance2.js
index 1af6b6f846c37..475f9bd4ceb53 100644
--- a/tests/baselines/reference/classSideInheritance2.js
+++ b/tests/baselines/reference/classSideInheritance2.js
@@ -29,8 +29,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var SubText = (function (_super) {
     __extends(SubText, _super);
     function SubText(text, span) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return SubText;
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index fda7b0b0848bd..361378c3ff518 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -33,8 +33,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x, data) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.data = data;
         return _this;
     }
@@ -43,8 +42,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return _this;
     }
     return C;
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index 2d7ecc3c1908b..9809966c4c26f 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -157,8 +157,7 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.p1 = 0;
         return _this;
     }
@@ -175,8 +174,7 @@ var F = (function (_super) {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.p1 = 0;
         return _this;
     } // NO ERROR
@@ -191,8 +189,7 @@ var H = (function () {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     } // ERROR - no super call allowed
     return I;
@@ -200,8 +197,7 @@ var I = (function (_super) {
 var J = (function (_super) {
     __extends(J, _super);
     function J(p1) {
-        var _this;
-        _this = _super.call(this) || this; // NO ERROR
+        var _this = _super.call(this) || this;
         _this.p1 = p1;
         return _this;
     }
@@ -221,8 +217,7 @@ var K = (function (_super) {
 var L = (function (_super) {
     __extends(L, _super);
     function L(p1) {
-        var _this;
-        _this = _super.call(this) || this; // NO ERROR
+        var _this = _super.call(this) || this;
         _this.p1 = p1;
         return _this;
     }
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
index 5f2a5e89301d7..d4a22b731f2cf 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInConstructor.js
@@ -42,8 +42,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         function _super() {
         }
         return _this;
@@ -53,8 +52,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var x = function () {
             function _super() {
             }
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
index a6893c6a57a7c..67b7f0e399197 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInProperty.js
@@ -40,8 +40,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.prop2 = {
             doStuff: function () {
                 function _super() {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
index d799c78350369..e3069352c0865 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInConstructor.js
@@ -36,8 +36,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var _super = 10; // Should be error 
         return _this;
     }
@@ -46,8 +45,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var x = function () {
             var _super = 10; // Should be error
         };
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
index 4bb4f6a5a8b73..d793e022c6b74 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInProperty.js
@@ -38,8 +38,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.prop2 = {
             doStuff: function () {
                 var _super = 10; // Should be error 
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index 6ed47a1b3c167..750ae15ef0aef 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -94,8 +94,7 @@ var Foo = (function () {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.prop4 = {
             doStuff: function (_super) {
             }
@@ -125,8 +124,7 @@ var Foo2 = (function (_super) {
 var Foo4 = (function (_super) {
     __extends(Foo4, _super);
     function Foo4(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     Foo4.prototype.y = function (_super) {
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index 2d3709fa878a9..269881b3b90ce 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -44,8 +44,7 @@ var a = (function () {
 var b1 = (function (_super) {
     __extends(b1, _super);
     function b1(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return b1;
@@ -53,8 +52,7 @@ var b1 = (function (_super) {
 var b2 = (function (_super) {
     __extends(b2, _super);
     function b2(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this._super = _super;
         return _this;
     }
@@ -63,8 +61,7 @@ var b2 = (function (_super) {
 var b3 = (function (_super) {
     __extends(b3, _super);
     function b3(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return b3;
@@ -72,8 +69,7 @@ var b3 = (function (_super) {
 var b4 = (function (_super) {
     __extends(b4, _super);
     function b4(_super) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this._super = _super;
         return _this;
     }
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 370ee0d246ca3..294f3a3369054 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -227,8 +227,7 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        var _this;
-        _this = _super.call(this, 10) || this;
+        var _this = _super.call(this, 10) || this;
         return _this;
     }
     /** c3 f1*/
diff --git a/tests/baselines/reference/compoundAssignmentLHSIsValue.js b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
index dfbdf31c3d1c3..bfea11911bf88 100644
--- a/tests/baselines/reference/compoundAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundAssignmentLHSIsValue.js
@@ -197,8 +197,7 @@ value;
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype. *= value;
         _super.prototype. += value;
         return _this;
diff --git a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
index da670472b4759..c8fb8c6a22221 100644
--- a/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
+++ b/tests/baselines/reference/compoundExponentiationAssignmentLHSIsValue.js
@@ -139,8 +139,7 @@ _a = Math.pow(['', ''], value), '' = _a[0], '' = _a[1];
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         (_a = _super.prototype). = Math.pow(_a., value);
         var _a;
         return _this;
diff --git a/tests/baselines/reference/computedPropertyNames28_ES5.js b/tests/baselines/reference/computedPropertyNames28_ES5.js
index 8152394cbf8c5..ab765c56dd75f 100644
--- a/tests/baselines/reference/computedPropertyNames28_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames28_ES5.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var obj = (_a = {},
             _a[(_this = _super.call(this) || this, "prop")] = function () { },
             _a);
diff --git a/tests/baselines/reference/computedPropertyNames30_ES5.js b/tests/baselines/reference/computedPropertyNames30_ES5.js
index 9f4a4ab51f9bc..c2c7cddd97170 100644
--- a/tests/baselines/reference/computedPropertyNames30_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames30_ES5.js
@@ -29,8 +29,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         (function () {
             var obj = (_a = {},
                 // Ideally, we would capture this. But the reference is
diff --git a/tests/baselines/reference/constructorArgs.js b/tests/baselines/reference/constructorArgs.js
index c7939472a9609..6bbea0fddf714 100644
--- a/tests/baselines/reference/constructorArgs.js
+++ b/tests/baselines/reference/constructorArgs.js
@@ -29,8 +29,7 @@ var Super = (function () {
 var Sub = (function (_super) {
     __extends(Sub, _super);
     function Sub(options) {
-        var _this;
-        _this = _super.call(this, options.value) || this;
+        var _this = _super.call(this, options.value) || this;
         _this.options = options;
         return _this;
     }
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index 4f70c7d7f35d1..1ae239430c700 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -47,8 +47,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return _this;
     }
     return Derived;
@@ -57,8 +56,7 @@ var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     // ok, not enforcing assignability relation on this
     function Derived2(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return 1;
         return _this;
     }
diff --git a/tests/baselines/reference/constructorOverloads2.js b/tests/baselines/reference/constructorOverloads2.js
index 0041acb489e03..c26d031656fa9 100644
--- a/tests/baselines/reference/constructorOverloads2.js
+++ b/tests/baselines/reference/constructorOverloads2.js
@@ -40,8 +40,7 @@ var FooBase = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return _this;
     }
     Foo.prototype.bar1 = function () { };
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 0e5351e69eadd..328ab0cd9491b 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -58,8 +58,7 @@ var templa;
             var AbstractElementController = (function (_super) {
                 __extends(AbstractElementController, _super);
                 function AbstractElementController() {
-                    var _this;
-                    _this = _super.call(this) || this;
+                    var _this = _super.call(this) || this;
                     return _this;
                 }
                 return AbstractElementController;
@@ -80,8 +79,7 @@ var templa;
                 var AbstractCompositeElementController = (function (_super) {
                     __extends(AbstractCompositeElementController, _super);
                     function AbstractCompositeElementController() {
-                        var _this;
-                        _this = _super.call(this) || this;
+                        var _this = _super.call(this) || this;
                         _this._controllers = [];
                         return _this;
                     }
diff --git a/tests/baselines/reference/decoratorOnClassConstructor2.js b/tests/baselines/reference/decoratorOnClassConstructor2.js
index 1f0b9b0d51722..44bde0a171d90 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor2.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor2.js
@@ -45,8 +45,7 @@ var _0_ts_2 = require("./0.ts");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return C;
diff --git a/tests/baselines/reference/decoratorOnClassConstructor3.js b/tests/baselines/reference/decoratorOnClassConstructor3.js
index 9182cce66f4ce..5130986b1f78e 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor3.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor3.js
@@ -48,8 +48,7 @@ var _0_2 = require("./0");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return C;
diff --git a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
index fd601ff221162..a0b1559d43089 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
@@ -32,8 +32,7 @@ var BaseClass = (function () {
 var DerivedClass = (function (_super) {
     __extends(DerivedClass, _super);
     function DerivedClass() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     DerivedClass.prototype._init = function () {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
index 12344c199158c..e86806d31d203 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
@@ -66,8 +66,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return _this;
     }
     Derived.prototype.b = function (a) { };
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index 37be9e209ac57..3035b2cb56fcb 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -94,8 +94,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Derived.prototype.b = function (a) { };
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
index 0836c9d7f41dc..0e0c1c1ff01e7 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
@@ -103,8 +103,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     return Derived1;
@@ -112,8 +111,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Derived2.prototype.b = function (a) { };
@@ -122,8 +120,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Object.defineProperty(Derived3.prototype, "c", {
@@ -136,8 +133,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Object.defineProperty(Derived4.prototype, "c", {
@@ -150,8 +146,7 @@ var Derived4 = (function (_super) {
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     return Derived5;
@@ -159,8 +154,7 @@ var Derived5 = (function (_super) {
 var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     return Derived6;
@@ -168,8 +162,7 @@ var Derived6 = (function (_super) {
 var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Derived7.s = function (a) { };
@@ -178,8 +171,7 @@ var Derived7 = (function (_super) {
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Object.defineProperty(Derived8, "t", {
@@ -192,8 +184,7 @@ var Derived8 = (function (_super) {
 var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     Object.defineProperty(Derived9, "t", {
@@ -206,8 +197,7 @@ var Derived9 = (function (_super) {
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(a) {
-        var _this;
-        _this = _super.call(this, a) || this;
+        var _this = _super.call(this, a) || this;
         return _this;
     }
     return Derived10;
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index 8d0375ab13a26..703f1d4a833ea 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -92,8 +92,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         return _this;
     }
     Derived.prototype.b = function (a) { };
diff --git a/tests/baselines/reference/derivedClassParameterProperties.js b/tests/baselines/reference/derivedClassParameterProperties.js
index f623653d6fa46..27dcc4b7d5dba 100644
--- a/tests/baselines/reference/derivedClassParameterProperties.js
+++ b/tests/baselines/reference/derivedClassParameterProperties.js
@@ -130,8 +130,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(y) {
-        var _this;
-        _this = _super.call(this) || this; // ok
+        var _this = _super.call(this) || this;
         _this.y = y;
         var a = 1;
         return _this;
@@ -152,8 +151,7 @@ var Derived4 = (function (_super) {
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(y) {
-        var _this;
-        _this = _super.call(this) || this; // ok
+        var _this = _super.call(this) || this;
         _this.a = 1;
         var b = 2;
         return _this;
@@ -186,8 +184,7 @@ var Derived7 = (function (_super) {
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(y) {
-        var _this;
-        _this = _super.call(this) || this; // ok
+        var _this = _super.call(this) || this;
         _this.a = 1;
         _this.a = 3;
         _this.b = 3;
@@ -216,8 +213,7 @@ var Derived9 = (function (_super) {
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(y) {
-        var _this;
-        _this = _super.call(this) || this; // ok
+        var _this = _super.call(this) || this;
         _this.a = 1;
         _this.a = 3;
         _this.b = 3;
diff --git a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
index e3bbf2699c5a9..b778d7bbca281 100644
--- a/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
+++ b/tests/baselines/reference/derivedClassSuperCallsInNonConstructorMembers.js
@@ -46,8 +46,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.a = _this = _super.call(this) || this;
         return _this;
     }
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index 102944889bdf8..039e25919f8c9 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -42,8 +42,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.call(this, _this) || this; // ok
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return Derived;
@@ -51,8 +50,7 @@ var Derived = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        var _this;
-        _this = _super.call(this, _this) || this; // error
+        var _this = _super.call(this, _this) || this;
         _this.a = a;
         return _this;
     }
@@ -61,8 +59,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        var _this;
-        _this = _super.call(this, function () { return _this; }) || this; // error
+        var _this = _super.call(this, function () { return _this; }) || this;
         _this.a = a;
         return _this;
     }
@@ -71,8 +68,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        var _this;
-        _this = _super.call(this, function () { return this; }) || this; // ok
+        var _this = _super.call(this, function () { return this; }) || this;
         _this.a = a;
         return _this;
     }
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
index f5eb3d22360ac..7a6a7ecbb638b 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor.js
@@ -41,8 +41,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
         return _this;
@@ -60,8 +59,7 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
         return _this;
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
index 5ad203892308c..62beb4bf28f65 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor2.js
@@ -49,8 +49,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
         return _this;
@@ -70,8 +69,7 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
         return _this;
diff --git a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
index d0e5f22d4f3d4..c96d0c96723da 100644
--- a/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
+++ b/tests/baselines/reference/derivedClassWithoutExplicitConstructor3.js
@@ -63,8 +63,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(y, z) {
-        var _this;
-        _this = _super.call(this, 2) || this;
+        var _this = _super.call(this, 2) || this;
         _this.b = '';
         _this.b = y;
         return _this;
@@ -74,8 +73,7 @@ var Derived = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         _this.y = 'hello';
         return _this;
@@ -94,8 +92,7 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D(y, z) {
-        var _this;
-        _this = _super.call(this, 2) || this;
+        var _this = _super.call(this, 2) || this;
         _this.b = null;
         _this.b = y;
         return _this;
@@ -105,8 +102,7 @@ var D = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = null;
         return _this;
diff --git a/tests/baselines/reference/destructuringParameterDeclaration5.js b/tests/baselines/reference/destructuringParameterDeclaration5.js
index 8c35b9044a19d..8781671853fcb 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration5.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration5.js
@@ -65,8 +65,7 @@ var Class = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return SubClass;
@@ -79,8 +78,7 @@ var D = (function () {
 var SubD = (function (_super) {
     __extends(SubD, _super);
     function SubD() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return SubD;
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
index efed8e66a155c..05b061116d3b4 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitParameterPropertyDeclaration1.js
@@ -30,8 +30,7 @@ var B = (function (_super) {
     function B(x) {
         "use strict";
         'someStringForEgngInject';
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.x = x;
         return _this;
     }
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
index 6e3d3bfaa1b70..2cf2cb02073d6 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclaration1.js
@@ -32,8 +32,7 @@ var B = (function (_super) {
     function B() {
         "use strict";
         'someStringForEgngInject';
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.blub = 12;
         return _this;
     }
diff --git a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
index 6559569fe79b4..eaa52e392853b 100644
--- a/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
+++ b/tests/baselines/reference/emitSuperCallBeforeEmitPropertyDeclarationAndParameterPropertyDeclaration1.js
@@ -30,8 +30,7 @@ var B = (function (_super) {
     function B(x) {
         "use strict";
         'someStringForEgngInject';
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.x = x;
         _this.blah = 2;
         return _this;
diff --git a/tests/baselines/reference/errorSuperCalls.js b/tests/baselines/reference/errorSuperCalls.js
index 864bc19a34452..720894e50c041 100644
--- a/tests/baselines/reference/errorSuperCalls.js
+++ b/tests/baselines/reference/errorSuperCalls.js
@@ -147,8 +147,7 @@ var OtherBase = (function () {
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         //super call in class member initializer of derived type
         _this.t = _this = _super.call(this) || this;
         return _this;
diff --git a/tests/baselines/reference/errorSuperPropertyAccess.js b/tests/baselines/reference/errorSuperPropertyAccess.js
index 1b7c9a418fc65..0fef86493f1f6 100644
--- a/tests/baselines/reference/errorSuperPropertyAccess.js
+++ b/tests/baselines/reference/errorSuperPropertyAccess.js
@@ -186,8 +186,7 @@ SomeBase.publicStaticMember = 0;
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype.publicMember = 1;
         return _this;
     }
@@ -221,8 +220,7 @@ var SomeDerived1 = (function (_super) {
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype.privateMember = 1;
         return _this;
     }
diff --git a/tests/baselines/reference/es6ClassTest.js b/tests/baselines/reference/es6ClassTest.js
index 705915812be47..d0879152544d1 100644
--- a/tests/baselines/reference/es6ClassTest.js
+++ b/tests/baselines/reference/es6ClassTest.js
@@ -102,9 +102,8 @@ var Bar = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y, z) {
-        var _this;
+        var _this = _super.call(this, x) || this;
         if (z === void 0) { z = 0; }
-        _this = _super.call(this, x) || this;
         _this.y = y;
         _this.z = z;
         _this.gar = 0;
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index eec5d830e011c..9217f89037731 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -267,8 +267,7 @@ var SuperParent = (function () {
 var SuperChild = (function (_super) {
     __extends(SuperChild, _super);
     function SuperChild() {
-        var _this;
-        _this = _super.call(this, 1) || this;
+        var _this = _super.call(this, 1) || this;
         return _this;
     }
     SuperChild.prototype.b = function () {
diff --git a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
index ccbac1d22b5ae..86410aaf10e71 100644
--- a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
+++ b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
@@ -109,8 +109,7 @@ var PortalFx;
                 var Validator = (function (_super) {
                     __extends(Validator, _super);
                     function Validator(message) {
-                        var _this;
-                        _this = _super.call(this, message) || this;
+                        var _this = _super.call(this, message) || this;
                         return _this;
                     }
                     return Validator;
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
index 246b9b76e3c57..582937e7c0a1a 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
@@ -52,8 +52,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this;
-                _this = _super.call(this, from) || this;
+                var _this = _super.call(this, from) || this;
                 return _this;
             }
             return NumberTween;
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
index e7744b28833ca..88173a4cbe361 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
@@ -51,8 +51,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this;
-                _this = _super.call(this, from) || this;
+                var _this = _super.call(this, from) || this;
                 return _this;
             }
             return NumberTween;
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
index d22823b9f8152..5a02ceb0ff4b5 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors3.js
@@ -59,8 +59,7 @@ var TypeScript;
     var PullTypeSymbol = (function (_super) {
         __extends(PullTypeSymbol, _super);
         function PullTypeSymbol() {
-            var _this;
-            _this = _super.apply(this, arguments) || this;
+            var _this = _super.apply(this, arguments) || this;
             _this._elementType = null;
             return _this;
         }
diff --git a/tests/baselines/reference/genericTypeConstraints.js b/tests/baselines/reference/genericTypeConstraints.js
index 48ff00e5ac25b..b82e261a14f1d 100644
--- a/tests/baselines/reference/genericTypeConstraints.js
+++ b/tests/baselines/reference/genericTypeConstraints.js
@@ -38,8 +38,7 @@ var Bar = (function () {
 var BarExtended = (function (_super) {
     __extends(BarExtended, _super);
     function BarExtended() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return BarExtended;
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
index 51c64f48f6c57..49b5efbd01268 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate2.js
@@ -39,8 +39,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 2;
         _this.y = 3;
         return _this;
@@ -53,8 +52,7 @@ var D = (function (_super) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = "";
         return _this;
     }
diff --git a/tests/baselines/reference/lift.js b/tests/baselines/reference/lift.js
index a71f1c9065ae2..364d52d938567 100644
--- a/tests/baselines/reference/lift.js
+++ b/tests/baselines/reference/lift.js
@@ -32,8 +32,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C(y, z, w) {
-        var _this;
-        _this = _super.call(this, y) || this;
+        var _this = _super.call(this, y) || this;
         var x = 10 + w;
         var ll = x * w;
         return _this;
diff --git a/tests/baselines/reference/missingPropertiesOfClassExpression.js b/tests/baselines/reference/missingPropertiesOfClassExpression.js
index 20252f37e6173..34b60940aa976 100644
--- a/tests/baselines/reference/missingPropertiesOfClassExpression.js
+++ b/tests/baselines/reference/missingPropertiesOfClassExpression.js
@@ -15,8 +15,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var George = (function (_super) {
     __extends(George, _super);
     function George() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return George;
diff --git a/tests/baselines/reference/objectCreationOfElementAccessExpression.js b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
index 760454dd9a469..a1739ce0d8e29 100644
--- a/tests/baselines/reference/objectCreationOfElementAccessExpression.js
+++ b/tests/baselines/reference/objectCreationOfElementAccessExpression.js
@@ -81,8 +81,7 @@ var Food = (function () {
 var MonsterFood = (function (_super) {
     __extends(MonsterFood, _super);
     function MonsterFood(name, flavor) {
-        var _this;
-        _this = _super.call(this, name) || this;
+        var _this = _super.call(this, name) || this;
         _this.flavor = flavor;
         return _this;
     }
@@ -91,8 +90,7 @@ var MonsterFood = (function (_super) {
 var IceCream = (function (_super) {
     __extends(IceCream, _super);
     function IceCream(flavor) {
-        var _this;
-        _this = _super.call(this, "Ice Cream", flavor) || this;
+        var _this = _super.call(this, "Ice Cream", flavor) || this;
         _this.flavor = flavor;
         return _this;
     }
@@ -101,8 +99,7 @@ var IceCream = (function (_super) {
 var Cookie = (function (_super) {
     __extends(Cookie, _super);
     function Cookie(flavor, isGlutenFree) {
-        var _this;
-        _this = _super.call(this, "Cookie", flavor) || this;
+        var _this = _super.call(this, "Cookie", flavor) || this;
         _this.flavor = flavor;
         _this.isGlutenFree = isGlutenFree;
         return _this;
@@ -112,8 +109,7 @@ var Cookie = (function (_super) {
 var PetFood = (function (_super) {
     __extends(PetFood, _super);
     function PetFood(name, whereToBuy) {
-        var _this;
-        _this = _super.call(this, name) || this;
+        var _this = _super.call(this, name) || this;
         _this.whereToBuy = whereToBuy;
         return _this;
     }
@@ -122,8 +118,7 @@ var PetFood = (function (_super) {
 var ExpensiveOrganicDogFood = (function (_super) {
     __extends(ExpensiveOrganicDogFood, _super);
     function ExpensiveOrganicDogFood(whereToBuy) {
-        var _this;
-        _this = _super.call(this, "Origen", whereToBuy) || this;
+        var _this = _super.call(this, "Origen", whereToBuy) || this;
         _this.whereToBuy = whereToBuy;
         return _this;
     }
@@ -132,8 +127,7 @@ var ExpensiveOrganicDogFood = (function (_super) {
 var ExpensiveOrganicCatFood = (function (_super) {
     __extends(ExpensiveOrganicCatFood, _super);
     function ExpensiveOrganicCatFood(whereToBuy, containsFish) {
-        var _this;
-        _this = _super.call(this, "Nature's Logic", whereToBuy) || this;
+        var _this = _super.call(this, "Nature's Logic", whereToBuy) || this;
         _this.whereToBuy = whereToBuy;
         _this.containsFish = containsFish;
         return _this;
diff --git a/tests/baselines/reference/optionalMethods.js b/tests/baselines/reference/optionalMethods.js
index 72df561227f58..8b999b45d71fe 100644
--- a/tests/baselines/reference/optionalMethods.js
+++ b/tests/baselines/reference/optionalMethods.js
@@ -109,8 +109,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.a = 1;
         return _this;
     }
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index 258f05cbc8541..e93058d71d293 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -161,9 +161,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2(v2) {
-        var _this;
+        var _this = _super.call(this, v2) || this;
         if (v2 === void 0) { v2 = 6; }
-        _this = _super.call(this, v2) || this;
         return _this;
     }
     return C2;
diff --git a/tests/baselines/reference/optionalParameterProperty.js b/tests/baselines/reference/optionalParameterProperty.js
index ca78ad7286e38..f9b9ecaf99091 100644
--- a/tests/baselines/reference/optionalParameterProperty.js
+++ b/tests/baselines/reference/optionalParameterProperty.js
@@ -25,8 +25,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D(p) {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.p = p;
         return _this;
     }
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks4.js b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
index 360b38ce70cb9..49d96b97b74c2 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks4.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
@@ -27,8 +27,7 @@ var Z = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = 1;
         return _this;
     }
diff --git a/tests/baselines/reference/parserAstSpans1.js b/tests/baselines/reference/parserAstSpans1.js
index 799a17d47deb3..c7bdb90775e19 100644
--- a/tests/baselines/reference/parserAstSpans1.js
+++ b/tests/baselines/reference/parserAstSpans1.js
@@ -318,8 +318,7 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        var _this;
-        _this = _super.call(this, 10) || this;
+        var _this = _super.call(this, 10) || this;
         _this.p1 = _super.prototype.c2_p1;
         return _this;
     }
@@ -407,8 +406,7 @@ var c5 = (function () {
 var c6 = (function (_super) {
     __extends(c6, _super);
     function c6() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.d = _super.prototype.b;
         return _this;
     }
diff --git a/tests/baselines/reference/parserRealSource10.js b/tests/baselines/reference/parserRealSource10.js
index 88516c9a692e9..253f856a9900f 100644
--- a/tests/baselines/reference/parserRealSource10.js
+++ b/tests/baselines/reference/parserRealSource10.js
@@ -826,8 +826,7 @@ var TypeScript;
     var NumberLiteralToken = (function (_super) {
         __extends(NumberLiteralToken, _super);
         function NumberLiteralToken(value, hasEmptyFraction) {
-            var _this;
-            _this = _super.call(this, TokenID.NumberLiteral) || this;
+            var _this = _super.call(this, TokenID.NumberLiteral) || this;
             _this.value = value;
             _this.hasEmptyFraction = hasEmptyFraction;
             return _this;
@@ -844,8 +843,7 @@ var TypeScript;
     var StringLiteralToken = (function (_super) {
         __extends(StringLiteralToken, _super);
         function StringLiteralToken(value) {
-            var _this;
-            _this = _super.call(this, TokenID.StringLiteral) || this;
+            var _this = _super.call(this, TokenID.StringLiteral) || this;
             _this.value = value;
             return _this;
         }
@@ -861,8 +859,7 @@ var TypeScript;
     var IdentifierToken = (function (_super) {
         __extends(IdentifierToken, _super);
         function IdentifierToken(value, hasEscapeSequence) {
-            var _this;
-            _this = _super.call(this, TokenID.Identifier) || this;
+            var _this = _super.call(this, TokenID.Identifier) || this;
             _this.value = value;
             _this.hasEscapeSequence = hasEscapeSequence;
             return _this;
@@ -879,8 +876,7 @@ var TypeScript;
     var WhitespaceToken = (function (_super) {
         __extends(WhitespaceToken, _super);
         function WhitespaceToken(tokenId, value) {
-            var _this;
-            _this = _super.call(this, tokenId) || this;
+            var _this = _super.call(this, tokenId) || this;
             _this.value = value;
             return _this;
         }
@@ -896,8 +892,7 @@ var TypeScript;
     var CommentToken = (function (_super) {
         __extends(CommentToken, _super);
         function CommentToken(tokenID, value, isBlock, startPos, line, endsLine) {
-            var _this;
-            _this = _super.call(this, tokenID) || this;
+            var _this = _super.call(this, tokenID) || this;
             _this.value = value;
             _this.isBlock = isBlock;
             _this.startPos = startPos;
@@ -917,8 +912,7 @@ var TypeScript;
     var RegularExpressionLiteralToken = (function (_super) {
         __extends(RegularExpressionLiteralToken, _super);
         function RegularExpressionLiteralToken(regex) {
-            var _this;
-            _this = _super.call(this, TokenID.RegularExpressionLiteral) || this;
+            var _this = _super.call(this, TokenID.RegularExpressionLiteral) || this;
             _this.regex = regex;
             return _this;
         }
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index fa112e51dadb0..fd2c017b637e4 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2386,8 +2386,7 @@ var TypeScript;
     var AST = (function (_super) {
         __extends(AST, _super);
         function AST(nodeType) {
-            var _this;
-            _this = _super.call(this) || this;
+            var _this = _super.call(this) || this;
             _this.nodeType = nodeType;
             _this.type = null;
             _this.flags = ASTFlags.Writeable;
@@ -2544,8 +2543,7 @@ var TypeScript;
     var IncompleteAST = (function (_super) {
         __extends(IncompleteAST, _super);
         function IncompleteAST(min, lim) {
-            var _this;
-            _this = _super.call(this, NodeType.Error) || this;
+            var _this = _super.call(this, NodeType.Error) || this;
             _this.minChar = min;
             _this.limChar = lim;
             return _this;
@@ -2556,8 +2554,7 @@ var TypeScript;
     var ASTList = (function (_super) {
         __extends(ASTList, _super);
         function ASTList() {
-            var _this;
-            _this = _super.call(this, NodeType.List) || this;
+            var _this = _super.call(this, NodeType.List) || this;
             _this.enclosingScope = null;
             _this.members = new AST[];
             return _this;
@@ -2625,8 +2622,7 @@ var TypeScript;
         //    To change text, and to avoid running into a situation where 'actualText' does not 
         //    match 'text', always use setText.
         function Identifier(actualText, hasEscapeSequence) {
-            var _this;
-            _this = _super.call(this, NodeType.Name) || this;
+            var _this = _super.call(this, NodeType.Name) || this;
             _this.actualText = actualText;
             _this.hasEscapeSequence = hasEscapeSequence;
             _this.sym = null;
@@ -2671,8 +2667,7 @@ var TypeScript;
     var MissingIdentifier = (function (_super) {
         __extends(MissingIdentifier, _super);
         function MissingIdentifier() {
-            var _this;
-            _this = _super.call(this, "__missing") || this;
+            var _this = _super.call(this, "__missing") || this;
             return _this;
         }
         MissingIdentifier.prototype.isMissing = function () {
@@ -2687,8 +2682,7 @@ var TypeScript;
     var Label = (function (_super) {
         __extends(Label, _super);
         function Label(id) {
-            var _this;
-            _this = _super.call(this, NodeType.Label) || this;
+            var _this = _super.call(this, NodeType.Label) || this;
             _this.id = id;
             return _this;
         }
@@ -2713,8 +2707,7 @@ var TypeScript;
     var Expression = (function (_super) {
         __extends(Expression, _super);
         function Expression(nodeType) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             return _this;
         }
         Expression.prototype.isExpression = function () { return true; };
@@ -2725,8 +2718,7 @@ var TypeScript;
     var UnaryExpression = (function (_super) {
         __extends(UnaryExpression, _super);
         function UnaryExpression(nodeType, operand) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.operand = operand;
             _this.targetType = null; // Target type for an object literal (null if no target type)
             _this.castTerm = null;
@@ -2871,8 +2863,7 @@ var TypeScript;
     var CallExpression = (function (_super) {
         __extends(CallExpression, _super);
         function CallExpression(nodeType, target, arguments) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.target = target;
             _this.arguments = arguments;
             _this.signature = null;
@@ -2905,8 +2896,7 @@ var TypeScript;
     var BinaryExpression = (function (_super) {
         __extends(BinaryExpression, _super);
         function BinaryExpression(nodeType, operand1, operand2) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.operand1 = operand1;
             _this.operand2 = operand2;
             return _this;
@@ -3059,8 +3049,7 @@ var TypeScript;
     var ConditionalExpression = (function (_super) {
         __extends(ConditionalExpression, _super);
         function ConditionalExpression(operand1, operand2, operand3) {
-            var _this;
-            _this = _super.call(this, NodeType.ConditionalExpression) || this;
+            var _this = _super.call(this, NodeType.ConditionalExpression) || this;
             _this.operand1 = operand1;
             _this.operand2 = operand2;
             _this.operand3 = operand3;
@@ -3086,8 +3075,7 @@ var TypeScript;
     var NumberLiteral = (function (_super) {
         __extends(NumberLiteral, _super);
         function NumberLiteral(value, hasEmptyFraction) {
-            var _this;
-            _this = _super.call(this, NodeType.NumberLit) || this;
+            var _this = _super.call(this, NodeType.NumberLit) || this;
             _this.value = value;
             _this.hasEmptyFraction = hasEmptyFraction;
             _this.isNegativeZero = false;
@@ -3129,8 +3117,7 @@ var TypeScript;
     var RegexLiteral = (function (_super) {
         __extends(RegexLiteral, _super);
         function RegexLiteral(regex) {
-            var _this;
-            _this = _super.call(this, NodeType.Regex) || this;
+            var _this = _super.call(this, NodeType.Regex) || this;
             _this.regex = regex;
             return _this;
         }
@@ -3151,8 +3138,7 @@ var TypeScript;
     var StringLiteral = (function (_super) {
         __extends(StringLiteral, _super);
         function StringLiteral(text) {
-            var _this;
-            _this = _super.call(this, NodeType.QString) || this;
+            var _this = _super.call(this, NodeType.QString) || this;
             _this.text = text;
             return _this;
         }
@@ -3179,8 +3165,7 @@ var TypeScript;
     var ModuleElement = (function (_super) {
         __extends(ModuleElement, _super);
         function ModuleElement(nodeType) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             return _this;
         }
         return ModuleElement;
@@ -3189,8 +3174,7 @@ var TypeScript;
     var ImportDeclaration = (function (_super) {
         __extends(ImportDeclaration, _super);
         function ImportDeclaration(id, alias) {
-            var _this;
-            _this = _super.call(this, NodeType.ImportDeclaration) || this;
+            var _this = _super.call(this, NodeType.ImportDeclaration) || this;
             _this.id = id;
             _this.alias = alias;
             _this.varFlags = VarFlags.None;
@@ -3250,8 +3234,7 @@ var TypeScript;
     var BoundDecl = (function (_super) {
         __extends(BoundDecl, _super);
         function BoundDecl(id, nodeType, nestingLevel) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.id = id;
             _this.nestingLevel = nestingLevel;
             _this.init = null;
@@ -3276,8 +3259,7 @@ var TypeScript;
     var VarDecl = (function (_super) {
         __extends(VarDecl, _super);
         function VarDecl(id, nest) {
-            var _this;
-            _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
+            var _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
             return _this;
         }
         VarDecl.prototype.isAmbient = function () { return hasFlag(this.varFlags, VarFlags.Ambient); };
@@ -3295,8 +3277,7 @@ var TypeScript;
     var ArgDecl = (function (_super) {
         __extends(ArgDecl, _super);
         function ArgDecl(id) {
-            var _this;
-            _this = _super.call(this, id, NodeType.ArgDecl, 0) || this;
+            var _this = _super.call(this, id, NodeType.ArgDecl, 0) || this;
             _this.isOptional = false;
             _this.parameterPropertySym = null;
             return _this;
@@ -3319,8 +3300,7 @@ var TypeScript;
     var FuncDecl = (function (_super) {
         __extends(FuncDecl, _super);
         function FuncDecl(name, bod, isConstructor, arguments, vars, scopes, statics, nodeType) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.name = name;
             _this.bod = bod;
             _this.isConstructor = isConstructor;
@@ -3461,8 +3441,7 @@ var TypeScript;
     var Script = (function (_super) {
         __extends(Script, _super);
         function Script(vars, scopes) {
-            var _this;
-            _this = _super.call(this, new Identifier("script"), null, false, null, vars, scopes, null, NodeType.Script) || this;
+            var _this = _super.call(this, new Identifier("script"), null, false, null, vars, scopes, null, NodeType.Script) || this;
             _this.locationInfo = null;
             _this.referencedFiles = [];
             _this.requiresGlobal = false;
@@ -3532,8 +3511,7 @@ var TypeScript;
     var NamedDeclaration = (function (_super) {
         __extends(NamedDeclaration, _super);
         function NamedDeclaration(nodeType, name, members) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.name = name;
             _this.members = members;
             _this.leftCurlyCount = 0;
@@ -3546,8 +3524,7 @@ var TypeScript;
     var ModuleDeclaration = (function (_super) {
         __extends(ModuleDeclaration, _super);
         function ModuleDeclaration(name, members, vars, scopes, endingToken) {
-            var _this;
-            _this = _super.call(this, NodeType.ModuleDeclaration, name, members) || this;
+            var _this = _super.call(this, NodeType.ModuleDeclaration, name, members) || this;
             _this.endingToken = endingToken;
             _this.modFlags = ModuleFlags.ShouldEmitModuleDecl;
             _this.amdDependencies = [];
@@ -3583,8 +3560,7 @@ var TypeScript;
     var TypeDeclaration = (function (_super) {
         __extends(TypeDeclaration, _super);
         function TypeDeclaration(nodeType, name, extendsList, implementsList, members) {
-            var _this;
-            _this = _super.call(this, nodeType, name, members) || this;
+            var _this = _super.call(this, nodeType, name, members) || this;
             _this.extendsList = extendsList;
             _this.implementsList = implementsList;
             _this.varFlags = VarFlags.None;
@@ -3602,8 +3578,7 @@ var TypeScript;
     var ClassDeclaration = (function (_super) {
         __extends(ClassDeclaration, _super);
         function ClassDeclaration(name, members, extendsList, implementsList) {
-            var _this;
-            _this = _super.call(this, NodeType.ClassDeclaration, name, extendsList, implementsList, members) || this;
+            var _this = _super.call(this, NodeType.ClassDeclaration, name, extendsList, implementsList, members) || this;
             _this.knownMemberNames = {};
             _this.constructorDecl = null;
             _this.constructorNestingLevel = 0;
@@ -3622,8 +3597,7 @@ var TypeScript;
     var InterfaceDeclaration = (function (_super) {
         __extends(InterfaceDeclaration, _super);
         function InterfaceDeclaration(name, members, extendsList, implementsList) {
-            var _this;
-            _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
+            var _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
             return _this;
         }
         InterfaceDeclaration.prototype.typeCheck = function (typeFlow) {
@@ -3637,8 +3611,7 @@ var TypeScript;
     var Statement = (function (_super) {
         __extends(Statement, _super);
         function Statement(nodeType) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.flags |= ASTFlags.IsStatement;
             return _this;
         }
@@ -3655,8 +3628,7 @@ var TypeScript;
     var LabeledStatement = (function (_super) {
         __extends(LabeledStatement, _super);
         function LabeledStatement(labels, stmt) {
-            var _this;
-            _this = _super.call(this, NodeType.LabeledStatement) || this;
+            var _this = _super.call(this, NodeType.LabeledStatement) || this;
             _this.labels = labels;
             _this.stmt = stmt;
             return _this;
@@ -3691,8 +3663,7 @@ var TypeScript;
     var Block = (function (_super) {
         __extends(Block, _super);
         function Block(statements, isStatementBlock) {
-            var _this;
-            _this = _super.call(this, NodeType.Block) || this;
+            var _this = _super.call(this, NodeType.Block) || this;
             _this.statements = statements;
             _this.isStatementBlock = isStatementBlock;
             return _this;
@@ -3748,8 +3719,7 @@ var TypeScript;
     var Jump = (function (_super) {
         __extends(Jump, _super);
         function Jump(nodeType) {
-            var _this;
-            _this = _super.call(this, nodeType) || this;
+            var _this = _super.call(this, nodeType) || this;
             _this.target = null;
             _this.resolvedTarget = null;
             return _this;
@@ -3801,8 +3771,7 @@ var TypeScript;
     var WhileStatement = (function (_super) {
         __extends(WhileStatement, _super);
         function WhileStatement(cond) {
-            var _this;
-            _this = _super.call(this, NodeType.While) || this;
+            var _this = _super.call(this, NodeType.While) || this;
             _this.cond = cond;
             _this.body = null;
             return _this;
@@ -3855,8 +3824,7 @@ var TypeScript;
     var DoWhileStatement = (function (_super) {
         __extends(DoWhileStatement, _super);
         function DoWhileStatement() {
-            var _this;
-            _this = _super.call(this, NodeType.DoWhile) || this;
+            var _this = _super.call(this, NodeType.DoWhile) || this;
             _this.body = null;
             _this.whileAST = null;
             _this.cond = null;
@@ -3913,8 +3881,7 @@ var TypeScript;
     var IfStatement = (function (_super) {
         __extends(IfStatement, _super);
         function IfStatement(cond) {
-            var _this;
-            _this = _super.call(this, NodeType.If) || this;
+            var _this = _super.call(this, NodeType.If) || this;
             _this.cond = cond;
             _this.elseBod = null;
             _this.statement = new ASTSpan();
@@ -3993,8 +3960,7 @@ var TypeScript;
     var ReturnStatement = (function (_super) {
         __extends(ReturnStatement, _super);
         function ReturnStatement() {
-            var _this;
-            _this = _super.call(this, NodeType.Return) || this;
+            var _this = _super.call(this, NodeType.Return) || this;
             _this.returnExpression = null;
             return _this;
         }
@@ -4026,8 +3992,7 @@ var TypeScript;
     var EndCode = (function (_super) {
         __extends(EndCode, _super);
         function EndCode() {
-            var _this;
-            _this = _super.call(this, NodeType.EndCode) || this;
+            var _this = _super.call(this, NodeType.EndCode) || this;
             return _this;
         }
         return EndCode;
@@ -4036,8 +4001,7 @@ var TypeScript;
     var ForInStatement = (function (_super) {
         __extends(ForInStatement, _super);
         function ForInStatement(lval, obj) {
-            var _this;
-            _this = _super.call(this, NodeType.ForIn) || this;
+            var _this = _super.call(this, NodeType.ForIn) || this;
             _this.lval = lval;
             _this.obj = obj;
             _this.statement = new ASTSpan();
@@ -4153,8 +4117,7 @@ var TypeScript;
     var ForStatement = (function (_super) {
         __extends(ForStatement, _super);
         function ForStatement(init) {
-            var _this;
-            _this = _super.call(this, NodeType.For) || this;
+            var _this = _super.call(this, NodeType.For) || this;
             _this.init = init;
             return _this;
         }
@@ -4246,8 +4209,7 @@ var TypeScript;
     var WithStatement = (function (_super) {
         __extends(WithStatement, _super);
         function WithStatement(expr) {
-            var _this;
-            _this = _super.call(this, NodeType.With) || this;
+            var _this = _super.call(this, NodeType.With) || this;
             _this.expr = expr;
             _this.withSym = null;
             return _this;
@@ -4274,8 +4236,7 @@ var TypeScript;
     var SwitchStatement = (function (_super) {
         __extends(SwitchStatement, _super);
         function SwitchStatement(val) {
-            var _this;
-            _this = _super.call(this, NodeType.Switch) || this;
+            var _this = _super.call(this, NodeType.Switch) || this;
             _this.val = val;
             _this.defaultCase = null;
             _this.statement = new ASTSpan();
@@ -4348,8 +4309,7 @@ var TypeScript;
     var CaseStatement = (function (_super) {
         __extends(CaseStatement, _super);
         function CaseStatement() {
-            var _this;
-            _this = _super.call(this, NodeType.Case) || this;
+            var _this = _super.call(this, NodeType.Case) || this;
             _this.expr = null;
             return _this;
         }
@@ -4403,8 +4363,7 @@ var TypeScript;
     var TypeReference = (function (_super) {
         __extends(TypeReference, _super);
         function TypeReference(term, arrayCount) {
-            var _this;
-            _this = _super.call(this, NodeType.TypeRef) || this;
+            var _this = _super.call(this, NodeType.TypeRef) || this;
             _this.term = term;
             _this.arrayCount = arrayCount;
             return _this;
@@ -4435,8 +4394,7 @@ var TypeScript;
     var TryFinally = (function (_super) {
         __extends(TryFinally, _super);
         function TryFinally(tryNode, finallyNode) {
-            var _this;
-            _this = _super.call(this, NodeType.TryFinally) || this;
+            var _this = _super.call(this, NodeType.TryFinally) || this;
             _this.tryNode = tryNode;
             _this.finallyNode = finallyNode;
             return _this;
@@ -4482,8 +4440,7 @@ var TypeScript;
     var TryCatch = (function (_super) {
         __extends(TryCatch, _super);
         function TryCatch(tryNode, catchNode) {
-            var _this;
-            _this = _super.call(this, NodeType.TryCatch) || this;
+            var _this = _super.call(this, NodeType.TryCatch) || this;
             _this.tryNode = tryNode;
             _this.catchNode = catchNode;
             return _this;
@@ -4534,8 +4491,7 @@ var TypeScript;
     var Try = (function (_super) {
         __extends(Try, _super);
         function Try(body) {
-            var _this;
-            _this = _super.call(this, NodeType.Try) || this;
+            var _this = _super.call(this, NodeType.Try) || this;
             _this.body = body;
             return _this;
         }
@@ -4564,8 +4520,7 @@ var TypeScript;
     var Catch = (function (_super) {
         __extends(Catch, _super);
         function Catch(param, body) {
-            var _this;
-            _this = _super.call(this, NodeType.Catch) || this;
+            var _this = _super.call(this, NodeType.Catch) || this;
             _this.param = param;
             _this.body = body;
             _this.statement = new ASTSpan();
@@ -4639,8 +4594,7 @@ var TypeScript;
     var Finally = (function (_super) {
         __extends(Finally, _super);
         function Finally(body) {
-            var _this;
-            _this = _super.call(this, NodeType.Finally) || this;
+            var _this = _super.call(this, NodeType.Finally) || this;
             _this.body = body;
             return _this;
         }
@@ -4669,8 +4623,7 @@ var TypeScript;
     var Comment = (function (_super) {
         __extends(Comment, _super);
         function Comment(content, isBlockComment, endsLine) {
-            var _this;
-            _this = _super.call(this, NodeType.Comment) || this;
+            var _this = _super.call(this, NodeType.Comment) || this;
             _this.content = content;
             _this.isBlockComment = isBlockComment;
             _this.endsLine = endsLine;
@@ -4697,8 +4650,7 @@ var TypeScript;
     var DebuggerStatement = (function (_super) {
         __extends(DebuggerStatement, _super);
         function DebuggerStatement() {
-            var _this;
-            _this = _super.call(this, NodeType.Debugger) || this;
+            var _this = _super.call(this, NodeType.Debugger) || this;
             return _this;
         }
         DebuggerStatement.prototype.emit = function (emitter, tokenId, startLine) {
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index 2d219c63e6abe..059ac2efd8ed6 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2380,8 +2380,7 @@ var Harness;
     var TestCase = (function (_super) {
         __extends(TestCase, _super);
         function TestCase(description, block) {
-            var _this;
-            _this = _super.call(this, description, block) || this;
+            var _this = _super.call(this, description, block) || this;
             _this.description = description;
             _this.block = block;
             return _this;
@@ -2416,8 +2415,7 @@ var Harness;
     var Scenario = (function (_super) {
         __extends(Scenario, _super);
         function Scenario(description, block) {
-            var _this;
-            _this = _super.call(this, description, block) || this;
+            var _this = _super.call(this, description, block) || this;
             _this.description = description;
             _this.block = block;
             return _this;
@@ -2473,8 +2471,7 @@ var Harness;
     var Run = (function (_super) {
         __extends(Run, _super);
         function Run() {
-            var _this;
-            _this = _super.call(this, 'Test Run', null) || this;
+            var _this = _super.call(this, 'Test Run', null) || this;
             return _this;
         }
         Run.prototype.run = function () {
diff --git a/tests/baselines/reference/privateInstanceMemberAccessibility.js b/tests/baselines/reference/privateInstanceMemberAccessibility.js
index c07238dff5ef3..6fa05178f9128 100644
--- a/tests/baselines/reference/privateInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/privateInstanceMemberAccessibility.js
@@ -27,8 +27,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.x = _super.prototype.foo; // error
         _this.z = _super.prototype.foo; // error
         return _this;
diff --git a/tests/baselines/reference/privateStaticMemberAccessibility.js b/tests/baselines/reference/privateStaticMemberAccessibility.js
index 0d4cfefb63b08..c1897e8503a92 100644
--- a/tests/baselines/reference/privateStaticMemberAccessibility.js
+++ b/tests/baselines/reference/privateStaticMemberAccessibility.js
@@ -22,8 +22,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.bing = function () { return Base.foo; }; // error
         return _this;
     }
diff --git a/tests/baselines/reference/readonlyConstructorAssignment.js b/tests/baselines/reference/readonlyConstructorAssignment.js
index 581b110298a32..872c00486c001 100644
--- a/tests/baselines/reference/readonlyConstructorAssignment.js
+++ b/tests/baselines/reference/readonlyConstructorAssignment.js
@@ -56,8 +56,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         // Fails, x is readonly
         _this.x = 1;
         return _this;
@@ -69,8 +68,7 @@ var C = (function (_super) {
     // This is the usual behavior of readonly properties:
     // if one is redeclared in a base class, then it can be assigned to.
     function C(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.x = x;
         _this.x = 1;
         return _this;
@@ -88,8 +86,7 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E(x) {
-        var _this;
-        _this = _super.call(this, x) || this;
+        var _this = _super.call(this, x) || this;
         _this.x = x;
         _this.x = 1;
         return _this;
diff --git a/tests/baselines/reference/returnInConstructor1.js b/tests/baselines/reference/returnInConstructor1.js
index 0ee301758cf1f..6c678db235880 100644
--- a/tests/baselines/reference/returnInConstructor1.js
+++ b/tests/baselines/reference/returnInConstructor1.js
@@ -123,8 +123,7 @@ var G = (function () {
 var H = (function (_super) {
     __extends(H, _super);
     function H() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return new G(); //error
         return _this;
     }
@@ -133,8 +132,7 @@ var H = (function (_super) {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return new G();
         return _this;
     }
diff --git a/tests/baselines/reference/scopeTests.js b/tests/baselines/reference/scopeTests.js
index 9436043094eb3..48863404a8ecb 100644
--- a/tests/baselines/reference/scopeTests.js
+++ b/tests/baselines/reference/scopeTests.js
@@ -25,8 +25,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.v = 1;
         _this.p = 1;
         C.s = 1;
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
index 7fef0a420100e..4bac0210c85ab 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js
@@ -21,8 +21,7 @@ var AbstractGreeter = (function () {
 var Greeter = (function (_super) {
     __extends(Greeter, _super);
     function Greeter() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.a = 10;
         _this.nameA = "Ten";
         return _this;
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
index 14f7f65f05056..6b18a783dfa1c 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
@@ -1,2 +1,2 @@
 //// [sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map]
-{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,UAGC;;QAFU,OAAC,GAAG,EAAE,CAAC;QACP,WAAK,GAAG,KAAK,CAAC;;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
+{"version":3,"file":"sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js","sourceRoot":"","sources":["sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts"],"names":[],"mappings":";;;;;AAAA;IAAA;IACA,CAAC;IAAD,sBAAC;AAAD,CAAC,AADD,IACC;AAED;IAAsB,2BAAe;IAArC;QAAA,kDAGC;QAFU,OAAC,GAAG,EAAE,CAAC;QACP,WAAK,GAAG,KAAK,CAAC;;IACzB,CAAC;IAAD,cAAC;AAAD,CAAC,AAHD,CAAsB,eAAe,GAGpC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
index e1adf2f7a297f..91e284fd06385 100644
--- a/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
+++ b/tests/baselines/reference/sourceMapValidationClassWithDefaultConstructorAndExtendsClause.sourcemap.txt
@@ -77,40 +77,38 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 ---
 >>>    function Greeter() {
 1 >^^^^
-2 >    ^^^^^^^^^^^^^^^->
+2 >    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(13, 5) Source(4, 1) + SourceIndex(0)
 ---
->>>        var _this;
+>>>        var _this = _super.apply(this, arguments) || this;
 1->^^^^^^^^
-2 >        ^^^^^^^^^^
-3 >                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 1->
 2 >        class Greeter extends AbstractGreeter {
   >            public a = 10;
   >            public nameA = "Ten";
   >        }
 1->Emitted(14, 9) Source(4, 1) + SourceIndex(0)
-2 >Emitted(14, 19) Source(7, 2) + SourceIndex(0)
+2 >Emitted(14, 59) Source(7, 2) + SourceIndex(0)
 ---
->>>        _this = _super.apply(this, arguments) || this;
 >>>        _this.a = 10;
-1->^^^^^^^^
+1 >^^^^^^^^
 2 >        ^^^^^^^
 3 >               ^^^
 4 >                  ^^
 5 >                    ^
 6 >                     ^^^^^^^^->
-1->
+1 >
 2 >        a
 3 >                = 
 4 >                  10
 5 >                    ;
-1->Emitted(16, 9) Source(5, 12) + SourceIndex(0)
-2 >Emitted(16, 16) Source(5, 13) + SourceIndex(0)
-3 >Emitted(16, 19) Source(5, 16) + SourceIndex(0)
-4 >Emitted(16, 21) Source(5, 18) + SourceIndex(0)
-5 >Emitted(16, 22) Source(5, 19) + SourceIndex(0)
+1 >Emitted(15, 9) Source(5, 12) + SourceIndex(0)
+2 >Emitted(15, 16) Source(5, 13) + SourceIndex(0)
+3 >Emitted(15, 19) Source(5, 16) + SourceIndex(0)
+4 >Emitted(15, 21) Source(5, 18) + SourceIndex(0)
+5 >Emitted(15, 22) Source(5, 19) + SourceIndex(0)
 ---
 >>>        _this.nameA = "Ten";
 1->^^^^^^^^
@@ -124,11 +122,11 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 3 >                    = 
 4 >                      "Ten"
 5 >                           ;
-1->Emitted(17, 9) Source(6, 12) + SourceIndex(0)
-2 >Emitted(17, 20) Source(6, 17) + SourceIndex(0)
-3 >Emitted(17, 23) Source(6, 20) + SourceIndex(0)
-4 >Emitted(17, 28) Source(6, 25) + SourceIndex(0)
-5 >Emitted(17, 29) Source(6, 26) + SourceIndex(0)
+1->Emitted(16, 9) Source(6, 12) + SourceIndex(0)
+2 >Emitted(16, 20) Source(6, 17) + SourceIndex(0)
+3 >Emitted(16, 23) Source(6, 20) + SourceIndex(0)
+4 >Emitted(16, 28) Source(6, 25) + SourceIndex(0)
+5 >Emitted(16, 29) Source(6, 26) + SourceIndex(0)
 ---
 >>>        return _this;
 >>>    }
@@ -138,8 +136,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 1 >
   >
 2 >    }
-1 >Emitted(19, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(19, 6) Source(7, 2) + SourceIndex(0)
+1 >Emitted(18, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(18, 6) Source(7, 2) + SourceIndex(0)
 ---
 >>>    return Greeter;
 1->^^^^
@@ -147,8 +145,8 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
 3 >                  ^^^->
 1->
 2 >    }
-1->Emitted(20, 5) Source(7, 1) + SourceIndex(0)
-2 >Emitted(20, 19) Source(7, 2) + SourceIndex(0)
+1->Emitted(19, 5) Source(7, 1) + SourceIndex(0)
+2 >Emitted(19, 19) Source(7, 2) + SourceIndex(0)
 ---
 >>>}(AbstractGreeter));
 1->
@@ -167,11 +165,11 @@ sourceFile:sourceMapValidationClassWithDefaultConstructorAndExtendsClause.ts
   >                     public a = 10;
   >                     public nameA = "Ten";
   >                 }
-1->Emitted(21, 1) Source(7, 1) + SourceIndex(0)
-2 >Emitted(21, 2) Source(7, 2) + SourceIndex(0)
-3 >Emitted(21, 2) Source(4, 1) + SourceIndex(0)
-4 >Emitted(21, 3) Source(4, 23) + SourceIndex(0)
-5 >Emitted(21, 18) Source(4, 38) + SourceIndex(0)
-6 >Emitted(21, 21) Source(7, 2) + SourceIndex(0)
+1->Emitted(20, 1) Source(7, 1) + SourceIndex(0)
+2 >Emitted(20, 2) Source(7, 2) + SourceIndex(0)
+3 >Emitted(20, 2) Source(4, 1) + SourceIndex(0)
+4 >Emitted(20, 3) Source(4, 23) + SourceIndex(0)
+5 >Emitted(20, 18) Source(4, 38) + SourceIndex(0)
+6 >Emitted(20, 21) Source(7, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=sourceMapValidationClassWithDefaultConstructorAndExtendsClause.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/staticInheritance.js b/tests/baselines/reference/staticInheritance.js
index 5e769cab563f8..d204c1aed47a8 100644
--- a/tests/baselines/reference/staticInheritance.js
+++ b/tests/baselines/reference/staticInheritance.js
@@ -27,8 +27,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.p1 = doThing(A); // OK
         _this.p2 = doThing(B); // OK
         return _this;
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index 1c33f16a3c67b..ecd6bacd20a7d 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -75,8 +75,7 @@ var B = (function (_super) {
     __extends(B, _super);
     function B() {
         "use strict"; // No error
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.s = 9;
         return _this;
     }
@@ -85,8 +84,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
-        _this = _super.call(this) || this; // No error
+        var _this = _super.call(this) || this;
         _this.s = 9;
         "use strict";
         return _this;
@@ -109,8 +107,7 @@ var Bs = (function (_super) {
     __extends(Bs, _super);
     function Bs() {
         "use strict"; // No error
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return Bs;
@@ -119,8 +116,7 @@ Bs.s = 9;
 var Cs = (function (_super) {
     __extends(Cs, _super);
     function Cs() {
-        var _this;
-        _this = _super.call(this) || this; // No error
+        var _this = _super.call(this) || this;
         "use strict";
         return _this;
     }
diff --git a/tests/baselines/reference/superAccess2.js b/tests/baselines/reference/superAccess2.js
index 408f9051badcb..54c5997815153 100644
--- a/tests/baselines/reference/superAccess2.js
+++ b/tests/baselines/reference/superAccess2.js
@@ -41,11 +41,10 @@ var Q = (function (_super) {
     __extends(Q, _super);
     // Super is not allowed in constructor args
     function Q(z, zz, zzz) {
-        var _this;
+        var _this = _super.call(this) || this;
         if (z === void 0) { z = _super.; }
         if (zz === void 0) { zz = _super.; }
         if (zzz === void 0) { zzz = function () { return _super.; }; }
-        _this = _super.call(this) || this;
         _this.z = z;
         _this.xx = _super.prototype.;
         return _this;
diff --git a/tests/baselines/reference/superCallArgsMustMatch.js b/tests/baselines/reference/superCallArgsMustMatch.js
index dc450147f889e..106d7433bf5a9 100644
--- a/tests/baselines/reference/superCallArgsMustMatch.js
+++ b/tests/baselines/reference/superCallArgsMustMatch.js
@@ -40,10 +40,10 @@ var T5 = (function () {
 var T6 = (function (_super) {
     __extends(T6, _super);
     function T6() {
-        var _this;
+        var _this = 
         // Should error; base constructor has type T for first arg,
         // which is instantiated with 'number' in the extends clause
-        _this = _super.call(this, "hi") || this;
+        _super.call(this, "hi") || this;
         var x = _this.foo;
         return _this;
     }
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing1.js b/tests/baselines/reference/superCallBeforeThisAccessing1.js
index a5d6ec18ce34e..e3aed9e40e9e2 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing1.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing1.js
@@ -30,8 +30,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this, i) || this;
+        var _this = _super.call(this, i) || this;
         var s = {
             t: _this._t
         };
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing2.js b/tests/baselines/reference/superCallBeforeThisAccessing2.js
index c7a206dbbbec3..91cc3d28dd6ec 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing2.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this, function () { _this._t; }) || this; // no error. only check when this is directly accessing in constructor
+        var _this = _super.call(this, function () { _this._t; }) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing4.js b/tests/baselines/reference/superCallBeforeThisAccessing4.js
index 311b7ca21831b..91acb88ce224c 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing4.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing4.js
@@ -34,8 +34,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this._t;
         return _this;
     }
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index e630d539f1405..4eb8e5266c2c5 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this, _this) || this;
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
index 2cfc0bfcbd45d..27f3db5145359 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
index f9eeadc98e623..a8d5e8008acd9 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
@@ -19,8 +19,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
index 02bec67d7aaa2..b12a3eef6d43c 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
-        _this = _super.call(this, function (value) { return String(value); }) || this;
+        var _this = _super.call(this, function (value) { return String(value); }) || this;
         return _this;
     }
     return B;
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
index 55c6ee6f4450a..c78e6693f165d 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
-        _this = _super.call(this, function (value) { return String(value); }) || this;
+        var _this = _super.call(this, function (value) { return String(value); }) || this;
         return _this;
     }
     return B;
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
index 977377e41d410..32d2065dd3f1c 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this;
-        _this = _super.call(this, function (value) { return String(value); }) || this;
+        var _this = _super.call(this, function (value) { return String(value); }) || this;
         return _this;
     }
     return B;
diff --git a/tests/baselines/reference/superCallInNonStaticMethod.js b/tests/baselines/reference/superCallInNonStaticMethod.js
index 503aee2dcc643..cd84052ca3cae 100644
--- a/tests/baselines/reference/superCallInNonStaticMethod.js
+++ b/tests/baselines/reference/superCallInNonStaticMethod.js
@@ -66,8 +66,7 @@ var Doing = (function () {
 var Other = (function (_super) {
     __extends(Other, _super);
     function Other() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.propertyInitializer = _super.prototype.instanceMethod.call(_this);
         _this.functionProperty = function () { _super.prototype.instanceMethod.call(_this); };
         _super.prototype.instanceMethod.call(_this);
diff --git a/tests/baselines/reference/superCallInsideClassDeclaration.js b/tests/baselines/reference/superCallInsideClassDeclaration.js
index 326662abdaccf..b696b4a302f40 100644
--- a/tests/baselines/reference/superCallInsideClassDeclaration.js
+++ b/tests/baselines/reference/superCallInsideClassDeclaration.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(D, _super);
             function D() {
-                var _this;
-                _this = _super.call(this) || this;
+                var _this = _super.call(this) || this;
                 return _this;
             }
             return D;
diff --git a/tests/baselines/reference/superCallInsideClassExpression.js b/tests/baselines/reference/superCallInsideClassExpression.js
index 5797085726dff..829311f237c34 100644
--- a/tests/baselines/reference/superCallInsideClassExpression.js
+++ b/tests/baselines/reference/superCallInsideClassExpression.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(class_1, _super);
             function class_1() {
-                var _this;
-                _this = _super.call(this) || this;
+                var _this = _super.call(this) || this;
                 return _this;
             }
             return class_1;
diff --git a/tests/baselines/reference/superCallOutsideConstructor.js b/tests/baselines/reference/superCallOutsideConstructor.js
index 65a8b435166b7..e32bfc660502b 100644
--- a/tests/baselines/reference/superCallOutsideConstructor.js
+++ b/tests/baselines/reference/superCallOutsideConstructor.js
@@ -37,8 +37,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.x = _this = _super.call(this) || this;
         var y = function () {
             _this = _super.call(this) || this;
diff --git a/tests/baselines/reference/superCallParameterContextualTyping1.js b/tests/baselines/reference/superCallParameterContextualTyping1.js
index 4e4ae47967a1b..0fe27f493e811 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping1.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping1.js
@@ -28,8 +28,7 @@ var B = (function (_super) {
     __extends(B, _super);
     // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
     function B() {
-        var _this;
-        _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
+        var _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
         return _this;
     }
     return B;
diff --git a/tests/baselines/reference/superCallParameterContextualTyping2.js b/tests/baselines/reference/superCallParameterContextualTyping2.js
index f3a246c6389a7..f970be44aff0c 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping2.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping2.js
@@ -27,8 +27,7 @@ var C = (function (_super) {
     __extends(C, _super);
     // Ensure 'value' is not of type 'any' by invoking it with type arguments.
     function C() {
-        var _this;
-        _this = _super.call(this, function (value) { return String(value()); }) || this;
+        var _this = _super.call(this, function (value) { return String(value()); }) || this;
         return _this;
     }
     return C;
diff --git a/tests/baselines/reference/superCallParameterContextualTyping3.js b/tests/baselines/reference/superCallParameterContextualTyping3.js
index e7b8b355108d8..6a43d58c47124 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping3.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping3.js
@@ -47,10 +47,10 @@ var CBase = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this;
+        var _this = 
         // Should be okay.
         // 'p' should have type 'string'.
-        _this = _super.call(this, {
+        _super.call(this, {
             method: function (p) {
                 p.length;
             }
diff --git a/tests/baselines/reference/superCalls.js b/tests/baselines/reference/superCalls.js
index 2fe7712ce68ce..99a3b78752c9e 100644
--- a/tests/baselines/reference/superCalls.js
+++ b/tests/baselines/reference/superCalls.js
@@ -47,8 +47,7 @@ var Derived = (function (_super) {
     __extends(Derived, _super);
     //super call in class constructor of derived type
     function Derived(q) {
-        var _this;
-        _this = _super.call(this, '') || this;
+        var _this = _super.call(this, '') || this;
         _this.q = q;
         //type of super call expression is void
         var p = _this = _super.call(this, '') || this;
diff --git a/tests/baselines/reference/superErrors.js b/tests/baselines/reference/superErrors.js
index 93676c5d8f3e9..19f0d74f6774a 100644
--- a/tests/baselines/reference/superErrors.js
+++ b/tests/baselines/reference/superErrors.js
@@ -76,8 +76,7 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.name = "Frank";
         // super call in an inner function in a constructor
         function inner() {
diff --git a/tests/baselines/reference/superInLambdas.js b/tests/baselines/reference/superInLambdas.js
index 9b4d956dc5a24..73ca53c3b5cb9 100644
--- a/tests/baselines/reference/superInLambdas.js
+++ b/tests/baselines/reference/superInLambdas.js
@@ -85,8 +85,7 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.name = "Frank";
         // super call in a constructor
         _super.prototype.sayHello.call(_this);
@@ -106,8 +105,7 @@ var RegisteredUser = (function (_super) {
 var RegisteredUser2 = (function (_super) {
     __extends(RegisteredUser2, _super);
     function RegisteredUser2() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.name = "Joe";
         // super call in a nested lambda in a constructor 
         var x = function () { return function () { return function () { return _super.prototype.sayHello.call(_this); }; }; };
@@ -123,8 +121,7 @@ var RegisteredUser2 = (function (_super) {
 var RegisteredUser3 = (function (_super) {
     __extends(RegisteredUser3, _super);
     function RegisteredUser3() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.name = "Sam";
         // super property in a nested lambda in a constructor 
         var superName = function () { return function () { return function () { return _super.prototype.name; }; }; };
@@ -140,8 +137,7 @@ var RegisteredUser3 = (function (_super) {
 var RegisteredUser4 = (function (_super) {
     __extends(RegisteredUser4, _super);
     function RegisteredUser4() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _this.name = "Mark";
         // super in a nested lambda in a constructor 
         var x = function () { return function () { return _super.prototype.; }; };
diff --git a/tests/baselines/reference/superPropertyAccess1.js b/tests/baselines/reference/superPropertyAccess1.js
index b6559a63a983a..0b1e4fc280f40 100644
--- a/tests/baselines/reference/superPropertyAccess1.js
+++ b/tests/baselines/reference/superPropertyAccess1.js
@@ -50,8 +50,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype.bar.call(_this);
         _super.prototype.x; // error
         return _this;
diff --git a/tests/baselines/reference/superPropertyAccess2.js b/tests/baselines/reference/superPropertyAccess2.js
index eded4e74a7f5f..7c72ad5d1bbc4 100644
--- a/tests/baselines/reference/superPropertyAccess2.js
+++ b/tests/baselines/reference/superPropertyAccess2.js
@@ -50,8 +50,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         _super.prototype.bar.call(_this); // error
         _super.prototype.x; // error
         return _this;
diff --git a/tests/baselines/reference/superPropertyAccessNoError.js b/tests/baselines/reference/superPropertyAccessNoError.js
index 2ba460d18f730..88a5da8b8fb13 100644
--- a/tests/baselines/reference/superPropertyAccessNoError.js
+++ b/tests/baselines/reference/superPropertyAccessNoError.js
@@ -99,8 +99,7 @@ var SomeBaseClass = (function () {
 var SomeDerivedClass = (function (_super) {
     __extends(SomeDerivedClass, _super);
     function SomeDerivedClass() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var x = _super.prototype.func.call(_this);
         var x;
         return _this;
diff --git a/tests/baselines/reference/superPropertyAccess_ES5.js b/tests/baselines/reference/superPropertyAccess_ES5.js
index 011c5129e9f1c..4e817b7bbf1c5 100644
--- a/tests/baselines/reference/superPropertyAccess_ES5.js
+++ b/tests/baselines/reference/superPropertyAccess_ES5.js
@@ -49,8 +49,7 @@ var MyBase = (function () {
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         var f1 = _super.prototype.getValue.call(_this);
         var f2 = _super.prototype.value;
         return _this;
diff --git a/tests/baselines/reference/superWithGenericSpecialization.js b/tests/baselines/reference/superWithGenericSpecialization.js
index 1152399e6eba4..96303dab4eda3 100644
--- a/tests/baselines/reference/superWithGenericSpecialization.js
+++ b/tests/baselines/reference/superWithGenericSpecialization.js
@@ -28,8 +28,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this; // uses the type parameter type of the base class, ie string
+        var _this = _super.call(this) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/superWithGenerics.js b/tests/baselines/reference/superWithGenerics.js
index f2580d30c5f48..36b485548716b 100644
--- a/tests/baselines/reference/superWithGenerics.js
+++ b/tests/baselines/reference/superWithGenerics.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.call(this) || this;
+        var _this = _super.call(this) || this;
         return _this;
     }
     return D;
diff --git a/tests/baselines/reference/targetTypeBaseCalls.js b/tests/baselines/reference/targetTypeBaseCalls.js
index a08380b173fb1..8581526c1b62f 100644
--- a/tests/baselines/reference/targetTypeBaseCalls.js
+++ b/tests/baselines/reference/targetTypeBaseCalls.js
@@ -35,8 +35,7 @@ new Foo(function (s) { s = 5; }); // error, if types are applied correctly
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this;
-        _this = _super.call(this, function (s) { s = 5; }) || this;
+        var _this = _super.call(this, function (s) { s = 5; }) || this;
         return _this;
     }
     return Bar;
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 10629d579bac2..7872aa121edf9 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -70,8 +70,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this;
-        _this = _super.call(this, _this) || this; // Error
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return ClassWithNoInitializer;
@@ -80,8 +79,7 @@ var ClassWithInitializer = (function (_super) {
     __extends(ClassWithInitializer, _super);
     //'this' in required super call
     function ClassWithInitializer() {
-        var _this;
-        _this = _super.call(this, _this) || this; // Error
+        var _this = _super.call(this, _this) || this;
         _this.t = 4;
         return _this;
     }
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index 444952fea3fb3..e656824ae668b 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -71,8 +71,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this;
-        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return ClassWithNoInitializer;
@@ -81,8 +80,7 @@ var ClassWithInitializer = (function (_super) {
     __extends(ClassWithInitializer, _super);
     //'this' in required super call
     function ClassWithInitializer() {
-        var _this;
-        _this = _super.call(this, _this) || this; // Error
+        var _this = _super.call(this, _this) || this;
         _this.t = 4;
         return _this;
     }
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index f9d9f8694c95f..1c1f11ffbc88f 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -36,8 +36,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this;
-        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return Foo;
@@ -45,8 +44,7 @@ var Foo = (function (_super) {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        var _this;
-        _this = _super.call(this, _this) || this; // error
+        var _this = _super.call(this, _this) || this;
         _this.p = 0;
         return _this;
     }
@@ -55,8 +53,7 @@ var Foo2 = (function (_super) {
 var Foo3 = (function (_super) {
     __extends(Foo3, _super);
     function Foo3(p) {
-        var _this;
-        _this = _super.call(this, _this) || this; // error
+        var _this = _super.call(this, _this) || this;
         _this.p = p;
         return _this;
     }
diff --git a/tests/baselines/reference/thisInSuperCall1.js b/tests/baselines/reference/thisInSuperCall1.js
index 3185e42dab692..e3eea1fb91de2 100644
--- a/tests/baselines/reference/thisInSuperCall1.js
+++ b/tests/baselines/reference/thisInSuperCall1.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x) {
-        var _this;
-        _this = _super.call(this, _this) || this;
+        var _this = _super.call(this, _this) || this;
         _this.x = x;
         return _this;
     }
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index b9f7571868a88..6288082ed64f0 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -33,8 +33,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this;
-        _this = _super.call(this, _this) || this; // error: "super" has to be called before "this" accessing
+        var _this = _super.call(this, _this) || this;
         return _this;
     }
     return Foo;
@@ -42,8 +41,7 @@ var Foo = (function (_super) {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        var _this;
-        _this = _super.call(this, _this) || this; // error
+        var _this = _super.call(this, _this) || this;
         _this.x = 0;
         return _this;
     }
diff --git a/tests/baselines/reference/thisInSuperCall3.js b/tests/baselines/reference/thisInSuperCall3.js
index 309ebf934070a..6a72f17248f4b 100644
--- a/tests/baselines/reference/thisInSuperCall3.js
+++ b/tests/baselines/reference/thisInSuperCall3.js
@@ -26,8 +26,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this;
-        _this = _super.call(this, _this) || this;
+        var _this = _super.call(this, _this) || this;
         _this.x = 0;
         return _this;
     }
diff --git a/tests/baselines/reference/tsxDynamicTagName5.js b/tests/baselines/reference/tsxDynamicTagName5.js
index 307cd0fca93db..d3bb404ceea6c 100644
--- a/tests/baselines/reference/tsxDynamicTagName5.js
+++ b/tests/baselines/reference/tsxDynamicTagName5.js
@@ -30,8 +30,7 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
         return _this;
     }
diff --git a/tests/baselines/reference/tsxDynamicTagName7.js b/tests/baselines/reference/tsxDynamicTagName7.js
index 39e30b6ba387d..84debfd3e7194 100644
--- a/tests/baselines/reference/tsxDynamicTagName7.js
+++ b/tests/baselines/reference/tsxDynamicTagName7.js
@@ -30,8 +30,7 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
         return _this;
     }
diff --git a/tests/baselines/reference/tsxDynamicTagName8.js b/tests/baselines/reference/tsxDynamicTagName8.js
index 77423709347da..6166b99f4accb 100644
--- a/tests/baselines/reference/tsxDynamicTagName8.js
+++ b/tests/baselines/reference/tsxDynamicTagName8.js
@@ -30,8 +30,7 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
         return _this;
     }
diff --git a/tests/baselines/reference/tsxDynamicTagName9.js b/tests/baselines/reference/tsxDynamicTagName9.js
index 6b5d130c0b403..928649264c8b6 100644
--- a/tests/baselines/reference/tsxDynamicTagName9.js
+++ b/tests/baselines/reference/tsxDynamicTagName9.js
@@ -30,8 +30,7 @@ var React = require("react");
 var Text = (function (_super) {
     __extends(Text, _super);
     function Text() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this._tagName = 'div';
         return _this;
     }
diff --git a/tests/baselines/reference/typeGuardOfFormThisMember.js b/tests/baselines/reference/typeGuardOfFormThisMember.js
index 3995ffd447cd3..541c03dd4b4c7 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMember.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMember.js
@@ -118,8 +118,7 @@ var Test;
     var File = (function (_super) {
         __extends(File, _super);
         function File(path, content) {
-            var _this;
-            _this = _super.call(this, path) || this;
+            var _this = _super.call(this, path) || this;
             _this.content = content;
             return _this;
         }
diff --git a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
index 14807ddd88c31..b61676b40c360 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
@@ -68,8 +68,7 @@ var Test;
     var File = (function (_super) {
         __extends(File, _super);
         function File(path, content) {
-            var _this;
-            _this = _super.call(this, path) || this;
+            var _this = _super.call(this, path) || this;
             _this.content = content;
             return _this;
         }
diff --git a/tests/baselines/reference/typeRelationships.js b/tests/baselines/reference/typeRelationships.js
index eee995686380d..2f97f4b0d1c07 100644
--- a/tests/baselines/reference/typeRelationships.js
+++ b/tests/baselines/reference/typeRelationships.js
@@ -72,8 +72,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this;
-        _this = _super.apply(this, arguments) || this;
+        var _this = _super.apply(this, arguments) || this;
         _this.self1 = _this;
         _this.self2 = _this.self;
         _this.self3 = _this.foo();
diff --git a/tests/baselines/reference/unknownSymbols1.js b/tests/baselines/reference/unknownSymbols1.js
index 2c2b3ded1b562..5e2bb509a2325 100644
--- a/tests/baselines/reference/unknownSymbols1.js
+++ b/tests/baselines/reference/unknownSymbols1.js
@@ -63,8 +63,7 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this;
-        _this = _super.call(this, asdf) || this;
+        var _this = _super.call(this, asdf) || this;
         return _this;
     }
     return C4;
diff --git a/tests/baselines/reference/unspecializedConstraints.js b/tests/baselines/reference/unspecializedConstraints.js
index 02927bf558d04..7d5a4b9deedf2 100644
--- a/tests/baselines/reference/unspecializedConstraints.js
+++ b/tests/baselines/reference/unspecializedConstraints.js
@@ -234,8 +234,7 @@ var ts;
     var Property = (function (_super) {
         __extends(Property, _super);
         function Property(name, type, flags) {
-            var _this;
-            _this = _super.call(this) || this;
+            var _this = _super.call(this) || this;
             _this.name = name;
             _this.type = type;
             _this.flags = flags;
@@ -256,8 +255,7 @@ var ts;
     var Signature = (function (_super) {
         __extends(Signature, _super);
         function Signature(typeParameters, parameters, returnType) {
-            var _this;
-            _this = _super.call(this) || this;
+            var _this = _super.call(this) || this;
             _this.typeParameters = typeParameters;
             _this.parameters = parameters;
             _this.returnType = returnType;
@@ -278,8 +276,7 @@ var ts;
     var Parameter = (function (_super) {
         __extends(Parameter, _super);
         function Parameter(name, type, flags) {
-            var _this;
-            _this = _super.call(this) || this;
+            var _this = _super.call(this) || this;
             _this.name = name;
             _this.type = type;
             _this.flags = flags;
diff --git a/tests/baselines/reference/validUseOfThisInSuper.js b/tests/baselines/reference/validUseOfThisInSuper.js
index 3a05ff12ee8d0..bbd564db3663b 100644
--- a/tests/baselines/reference/validUseOfThisInSuper.js
+++ b/tests/baselines/reference/validUseOfThisInSuper.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this;
-        _this = _super.call(this, (function () { return _this; })()) || this; // ok since this is not the case: The constructor declares parameter properties or the containing class declares instance member variables with initializers.
+        var _this = _super.call(this, (function () { return _this; })()) || this;
         return _this;
     }
     return Super;
diff --git a/tests/baselines/reference/varArgsOnConstructorTypes.js b/tests/baselines/reference/varArgsOnConstructorTypes.js
index 9c1c8f8c29d88..0875f2ba1dd85 100644
--- a/tests/baselines/reference/varArgsOnConstructorTypes.js
+++ b/tests/baselines/reference/varArgsOnConstructorTypes.js
@@ -41,8 +41,7 @@ define(["require", "exports"], function (require, exports) {
     var B = (function (_super) {
         __extends(B, _super);
         function B(element, url) {
-            var _this;
-            _this = _super.call(this, element) || this;
+            var _this = _super.call(this, element) || this;
             _this.p1 = element;
             _this.p2 = url;
             return _this;

From 86088d0e7e9b7d31b04f4e4fb4327bb121e42def Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 00:30:40 -0700
Subject: [PATCH 13/39] Always perform `this` captures after default & rest
 parameters.

---
 src/compiler/transformers/es6.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 85838112fc313..44089326f7f1d 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -791,10 +791,10 @@ namespace ts {
             }
 
             if (constructor) {
-                Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
-                statementOffset = declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
+                Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
+                statementOffset = declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
             }
 
             addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);

From dd27139f39795fd0d83e8189c7a932364afe8044 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 00:31:09 -0700
Subject: [PATCH 14/39] Accepted baselines.

---
 tests/baselines/reference/es6ClassTest.js             | 2 +-
 tests/baselines/reference/optionalParamArgsTest.js    | 2 +-
 tests/baselines/reference/superAccess2.js             | 2 +-
 tests/baselines/reference/superInConstructorParam1.js | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/baselines/reference/es6ClassTest.js b/tests/baselines/reference/es6ClassTest.js
index d0879152544d1..067e57c258186 100644
--- a/tests/baselines/reference/es6ClassTest.js
+++ b/tests/baselines/reference/es6ClassTest.js
@@ -102,8 +102,8 @@ var Bar = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y, z) {
-        var _this = _super.call(this, x) || this;
         if (z === void 0) { z = 0; }
+        var _this = _super.call(this, x) || this;
         _this.y = y;
         _this.z = z;
         _this.gar = 0;
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index e93058d71d293..374b0956509fc 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -161,8 +161,8 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2(v2) {
-        var _this = _super.call(this, v2) || this;
         if (v2 === void 0) { v2 = 6; }
+        var _this = _super.call(this, v2) || this;
         return _this;
     }
     return C2;
diff --git a/tests/baselines/reference/superAccess2.js b/tests/baselines/reference/superAccess2.js
index 54c5997815153..da19770584acf 100644
--- a/tests/baselines/reference/superAccess2.js
+++ b/tests/baselines/reference/superAccess2.js
@@ -41,10 +41,10 @@ var Q = (function (_super) {
     __extends(Q, _super);
     // Super is not allowed in constructor args
     function Q(z, zz, zzz) {
-        var _this = _super.call(this) || this;
         if (z === void 0) { z = _super.; }
         if (zz === void 0) { zz = _super.; }
         if (zzz === void 0) { zzz = function () { return _super.; }; }
+        var _this = _super.call(this) || this;
         _this.z = z;
         _this.xx = _super.prototype.;
         return _this;
diff --git a/tests/baselines/reference/superInConstructorParam1.js b/tests/baselines/reference/superInConstructorParam1.js
index 7519a8253ecb9..8c99b64991733 100644
--- a/tests/baselines/reference/superInConstructorParam1.js
+++ b/tests/baselines/reference/superInConstructorParam1.js
@@ -27,8 +27,8 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C(a) {
-        var _this;
         if (a === void 0) { a = _super.foo.call(_this); }
+        var _this;
         return _this;
     }
     return C;

From f3dcaae0f02d597a6f0918488fde203d08570686 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 01:09:28 -0700
Subject: [PATCH 15/39] Added a test for branched returns at the end of a
 constructor.

---
 ...edClassConstructorWithExplicitReturns01.ts | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts

diff --git a/tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts b/tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts
new file mode 100644
index 0000000000000..2475eac0bb2d3
--- /dev/null
+++ b/tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts
@@ -0,0 +1,36 @@
+// @target: es5
+// @sourcemap: true
+
+class C {
+    cProp = 10;
+
+    foo() { return "this never gets used."; }
+
+    constructor(value: number) {
+        return {
+            cProp: value,
+            foo() {
+                return "well this looks kinda C-ish.";
+            }
+        }
+    }
+}
+
+class D extends C {
+    dProp = () => this;
+
+    constructor(a = 100) {
+        super(a);
+
+        if (Math.random() < 0.5) {
+            "You win!"
+            return {
+                cProp: 1,
+                dProp: () => this,
+                foo() { return "You win!!!!!" }
+            };
+        }
+        else
+            return null;
+    }
+}
\ No newline at end of file

From 1be4cee0c6fd9e19869e332d57672d74bc5f2dbd Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 01:10:07 -0700
Subject: [PATCH 16/39] Accepted baselines.

---
 ...edClassConstructorWithExplicitReturns01.js |  76 +++
 ...assConstructorWithExplicitReturns01.js.map |   2 +
 ...tructorWithExplicitReturns01.sourcemap.txt | 583 ++++++++++++++++++
 ...ssConstructorWithExplicitReturns01.symbols |  66 ++
 ...lassConstructorWithExplicitReturns01.types |  85 +++
 5 files changed, 812 insertions(+)
 create mode 100644 tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
 create mode 100644 tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
 create mode 100644 tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
 create mode 100644 tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.symbols
 create mode 100644 tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types

diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
new file mode 100644
index 0000000000000..de1e409b55fc7
--- /dev/null
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
@@ -0,0 +1,76 @@
+//// [derivedClassConstructorWithExplicitReturns01.ts]
+
+class C {
+    cProp = 10;
+
+    foo() { return "this never gets used."; }
+
+    constructor(value: number) {
+        return {
+            cProp: value,
+            foo() {
+                return "well this looks kinda C-ish.";
+            }
+        }
+    }
+}
+
+class D extends C {
+    dProp = () => this;
+
+    constructor(a = 100) {
+        super(a);
+
+        if (Math.random() < 0.5) {
+            "You win!"
+            return {
+                cProp: 1,
+                dProp: () => this,
+                foo() { return "You win!!!!!" }
+            };
+        }
+        else
+            return null;
+    }
+}
+
+//// [derivedClassConstructorWithExplicitReturns01.js]
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+var C = (function () {
+    function C(value) {
+        this.cProp = 10;
+        return {
+            cProp: value,
+            foo: function () {
+                return "well this looks kinda C-ish.";
+            }
+        };
+    }
+    C.prototype.foo = function () { return "this never gets used."; };
+    return C;
+}());
+var D = (function (_super) {
+    __extends(D, _super);
+    function D(a) {
+        if (a === void 0) { a = 100; }
+        var _this = _super.call(this, a) || this;
+        _this.dProp = function () { return _this; };
+        if (Math.random() < 0.5) {
+            "You win!";
+            return {
+                cProp: 1,
+                dProp: function () { return _this; },
+                foo: function () { return "You win!!!!!"; }
+            };
+        }
+        else
+            return null;
+        return _this;
+    }
+    return D;
+}(C));
+//# sourceMappingURL=derivedClassConstructorWithExplicitReturns01.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
new file mode 100644
index 0000000000000..dd7aedd1a9863
--- /dev/null
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
@@ -0,0 +1,2 @@
+//// [derivedClassConstructorWithExplicitReturns01.js.map]
+{"version":3,"file":"derivedClassConstructorWithExplicitReturns01.js","sourceRoot":"","sources":["derivedClassConstructorWithExplicitReturns01.ts"],"names":[],"mappings":";;;;;AACA;IAKI,WAAY,KAAa;QAJzB,UAAK,GAAG,EAAE,CAAC;QAKP,MAAM,CAAC;YACH,KAAK,EAAE,KAAK;YACZ,GAAG;gBACC,MAAM,CAAC,8BAA8B,CAAC;YAC1C,CAAC;SACJ,CAAA;IACL,CAAC;IATD,eAAG,GAAH,cAAQ,MAAM,CAAC,uBAAuB,CAAC,CAAC,CAAC;IAU7C,QAAC;AAAD,CAAC,AAbD,IAaC;AAED;IAAgB,qBAAC;IAGb,WAAY,CAAO;QAAP,kBAAA,EAAA,OAAO;QAAnB,YACI,kBAAM,CAAC,CAAC,SAYX;QAfD,WAAK,GAAG,cAAM,OAAA,KAAI,EAAJ,CAAI,CAAC;QAKf,EAAE,CAAC,CAAC,IAAI,CAAC,MAAM,EAAE,GAAG,GAAG,CAAC,CAAC,CAAC;YACtB,UAAU,CAAA;YACV,MAAM,CAAC;gBACH,KAAK,EAAE,CAAC;gBACR,KAAK,EAAE,cAAM,OAAA,KAAI,EAAJ,CAAI;gBACjB,GAAG,gBAAK,MAAM,CAAC,cAAc,CAAA,CAAC,CAAC;aAClC,CAAC;QACN,CAAC;QACD,IAAI;YACA,MAAM,CAAC,IAAI,CAAC;;IACpB,CAAC;IACL,QAAC;AAAD,CAAC,AAjBD,CAAgB,CAAC,GAiBhB"}
\ No newline at end of file
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
new file mode 100644
index 0000000000000..5f41ab5630055
--- /dev/null
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
@@ -0,0 +1,583 @@
+===================================================================
+JsFile: derivedClassConstructorWithExplicitReturns01.js
+mapUrl: derivedClassConstructorWithExplicitReturns01.js.map
+sourceRoot: 
+sources: derivedClassConstructorWithExplicitReturns01.ts
+===================================================================
+-------------------------------------------------------------------
+emittedFile:tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.js
+sourceFile:derivedClassConstructorWithExplicitReturns01.ts
+-------------------------------------------------------------------
+>>>var __extends = (this && this.__extends) || function (d, b) {
+>>>    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+>>>    function __() { this.constructor = d; }
+>>>    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+>>>};
+>>>var C = (function () {
+1 >
+2 >^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+  >
+1 >Emitted(6, 1) Source(2, 1) + SourceIndex(0)
+---
+>>>    function C(value) {
+1->^^^^
+2 >    ^^^^^^^^^^^
+3 >               ^^^^^
+4 >                    ^^^^^->
+1->class C {
+  >    cProp = 10;
+  >
+  >    foo() { return "this never gets used."; }
+  >
+  >    
+2 >    constructor(
+3 >               value: number
+1->Emitted(7, 5) Source(7, 5) + SourceIndex(0)
+2 >Emitted(7, 16) Source(7, 17) + SourceIndex(0)
+3 >Emitted(7, 21) Source(7, 30) + SourceIndex(0)
+---
+>>>        this.cProp = 10;
+1->^^^^^^^^
+2 >        ^^^^^^^^^^
+3 >                  ^^^
+4 >                     ^^
+5 >                       ^
+1->
+2 >        cProp
+3 >                   = 
+4 >                     10
+5 >                       ;
+1->Emitted(8, 9) Source(3, 5) + SourceIndex(0)
+2 >Emitted(8, 19) Source(3, 10) + SourceIndex(0)
+3 >Emitted(8, 22) Source(3, 13) + SourceIndex(0)
+4 >Emitted(8, 24) Source(3, 15) + SourceIndex(0)
+5 >Emitted(8, 25) Source(3, 16) + SourceIndex(0)
+---
+>>>        return {
+1 >^^^^^^^^
+2 >        ^^^^^^
+3 >              ^
+4 >               ^^^^^^^^^^^->
+1 >
+  >
+  >    foo() { return "this never gets used."; }
+  >
+  >    constructor(value: number) {
+  >        
+2 >        return
+3 >               
+1 >Emitted(9, 9) Source(8, 9) + SourceIndex(0)
+2 >Emitted(9, 15) Source(8, 15) + SourceIndex(0)
+3 >Emitted(9, 16) Source(8, 16) + SourceIndex(0)
+---
+>>>            cProp: value,
+1->^^^^^^^^^^^^
+2 >            ^^^^^
+3 >                 ^^
+4 >                   ^^^^^
+5 >                        ^^^^^^^->
+1->{
+  >            
+2 >            cProp
+3 >                 : 
+4 >                   value
+1->Emitted(10, 13) Source(9, 13) + SourceIndex(0)
+2 >Emitted(10, 18) Source(9, 18) + SourceIndex(0)
+3 >Emitted(10, 20) Source(9, 20) + SourceIndex(0)
+4 >Emitted(10, 25) Source(9, 25) + SourceIndex(0)
+---
+>>>            foo: function () {
+1->^^^^^^^^^^^^
+2 >            ^^^
+3 >               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->,
+  >            
+2 >            foo
+1->Emitted(11, 13) Source(10, 13) + SourceIndex(0)
+2 >Emitted(11, 16) Source(10, 16) + SourceIndex(0)
+---
+>>>                return "well this looks kinda C-ish.";
+1->^^^^^^^^^^^^^^^^
+2 >                ^^^^^^
+3 >                      ^
+4 >                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+5 >                                                     ^
+1->() {
+  >                
+2 >                return
+3 >                       
+4 >                       "well this looks kinda C-ish."
+5 >                                                     ;
+1->Emitted(12, 17) Source(11, 17) + SourceIndex(0)
+2 >Emitted(12, 23) Source(11, 23) + SourceIndex(0)
+3 >Emitted(12, 24) Source(11, 24) + SourceIndex(0)
+4 >Emitted(12, 54) Source(11, 54) + SourceIndex(0)
+5 >Emitted(12, 55) Source(11, 55) + SourceIndex(0)
+---
+>>>            }
+1 >^^^^^^^^^^^^
+2 >            ^
+1 >
+  >            
+2 >            }
+1 >Emitted(13, 13) Source(12, 13) + SourceIndex(0)
+2 >Emitted(13, 14) Source(12, 14) + SourceIndex(0)
+---
+>>>        };
+1 >^^^^^^^^^
+2 >         ^
+1 >
+  >        }
+2 >         
+1 >Emitted(14, 10) Source(13, 10) + SourceIndex(0)
+2 >Emitted(14, 11) Source(13, 10) + SourceIndex(0)
+---
+>>>    }
+1 >^^^^
+2 >    ^
+3 >     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+  >    
+2 >    }
+1 >Emitted(15, 5) Source(14, 5) + SourceIndex(0)
+2 >Emitted(15, 6) Source(14, 6) + SourceIndex(0)
+---
+>>>    C.prototype.foo = function () { return "this never gets used."; };
+1->^^^^
+2 >    ^^^^^^^^^^^^^^^
+3 >                   ^^^
+4 >                      ^^^^^^^^^^^^^^
+5 >                                    ^^^^^^
+6 >                                          ^
+7 >                                           ^^^^^^^^^^^^^^^^^^^^^^^
+8 >                                                                  ^
+9 >                                                                   ^
+10>                                                                    ^
+1->
+2 >    foo
+3 >                   
+4 >                      foo() { 
+5 >                                    return
+6 >                                           
+7 >                                           "this never gets used."
+8 >                                                                  ;
+9 >                                                                    
+10>                                                                    }
+1->Emitted(16, 5) Source(5, 5) + SourceIndex(0)
+2 >Emitted(16, 20) Source(5, 8) + SourceIndex(0)
+3 >Emitted(16, 23) Source(5, 5) + SourceIndex(0)
+4 >Emitted(16, 37) Source(5, 13) + SourceIndex(0)
+5 >Emitted(16, 43) Source(5, 19) + SourceIndex(0)
+6 >Emitted(16, 44) Source(5, 20) + SourceIndex(0)
+7 >Emitted(16, 67) Source(5, 43) + SourceIndex(0)
+8 >Emitted(16, 68) Source(5, 44) + SourceIndex(0)
+9 >Emitted(16, 69) Source(5, 45) + SourceIndex(0)
+10>Emitted(16, 70) Source(5, 46) + SourceIndex(0)
+---
+>>>    return C;
+1 >^^^^
+2 >    ^^^^^^^^
+1 >
+  >
+  >    constructor(value: number) {
+  >        return {
+  >            cProp: value,
+  >            foo() {
+  >                return "well this looks kinda C-ish.";
+  >            }
+  >        }
+  >    }
+  >
+2 >    }
+1 >Emitted(17, 5) Source(15, 1) + SourceIndex(0)
+2 >Emitted(17, 13) Source(15, 2) + SourceIndex(0)
+---
+>>>}());
+1 >
+2 >^
+3 > 
+4 > ^^^^
+5 >     ^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+2 >}
+3 > 
+4 > class C {
+  >     cProp = 10;
+  > 
+  >     foo() { return "this never gets used."; }
+  > 
+  >     constructor(value: number) {
+  >         return {
+  >             cProp: value,
+  >             foo() {
+  >                 return "well this looks kinda C-ish.";
+  >             }
+  >         }
+  >     }
+  > }
+1 >Emitted(18, 1) Source(15, 1) + SourceIndex(0)
+2 >Emitted(18, 2) Source(15, 2) + SourceIndex(0)
+3 >Emitted(18, 2) Source(2, 1) + SourceIndex(0)
+4 >Emitted(18, 6) Source(15, 2) + SourceIndex(0)
+---
+>>>var D = (function (_super) {
+1->
+2 >^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->
+  >
+  >
+1->Emitted(19, 1) Source(17, 1) + SourceIndex(0)
+---
+>>>    __extends(D, _super);
+1->^^^^
+2 >    ^^^^^^^^^^^^^^^^^^^^^
+1->class D extends 
+2 >    C
+1->Emitted(20, 5) Source(17, 17) + SourceIndex(0)
+2 >Emitted(20, 26) Source(17, 18) + SourceIndex(0)
+---
+>>>    function D(a) {
+1 >^^^^
+2 >    ^^^^^^^^^^^
+3 >               ^
+4 >                ^^^^^^^^^^^^^^^^^^^^^^^->
+1 > {
+  >    dProp = () => this;
+  >
+  >    
+2 >    constructor(
+3 >               a = 100
+1 >Emitted(21, 5) Source(20, 5) + SourceIndex(0)
+2 >Emitted(21, 16) Source(20, 17) + SourceIndex(0)
+3 >Emitted(21, 17) Source(20, 24) + SourceIndex(0)
+---
+>>>        if (a === void 0) { a = 100; }
+1->^^^^^^^^
+2 >        ^^^^^^^^^^^^^^^^^^
+3 >                          ^^
+4 >                            ^^^^^^^
+5 >                                   ^^^^^^^^^^^^^^^->
+1->
+2 >        
+3 >                          
+4 >                            a = 100
+1->Emitted(22, 9) Source(20, 17) + SourceIndex(0)
+2 >Emitted(22, 27) Source(20, 17) + SourceIndex(0)
+3 >Emitted(22, 29) Source(20, 17) + SourceIndex(0)
+4 >Emitted(22, 36) Source(20, 24) + SourceIndex(0)
+---
+>>>        var _this = _super.call(this, a) || this;
+1->^^^^^^^^
+2 >        ^^^^^^^^^^^^
+3 >                    ^^^^^^^^^^^^^^^^^^
+4 >                                      ^
+5 >                                       ^
+6 >                                        ^^^^^^^^^
+7 >                                                 ^^^^->
+1->
+2 >        constructor(a = 100) {
+  >                
+3 >                    super(
+4 >                                      a
+5 >                                       )
+6 >                                        ;
+  >                                        
+  >                                                if (Math.random() < 0.5) {
+  >                                                    "You win!"
+  >                                                    return {
+  >                                                        cProp: 1,
+  >                                                        dProp: () => this,
+  >                                                        foo() { return "You win!!!!!" }
+  >                                                    };
+  >                                                }
+  >                                                else
+  >                                                    return null;
+  >                                            }
+1->Emitted(23, 9) Source(20, 5) + SourceIndex(0)
+2 >Emitted(23, 21) Source(21, 9) + SourceIndex(0)
+3 >Emitted(23, 39) Source(21, 15) + SourceIndex(0)
+4 >Emitted(23, 40) Source(21, 16) + SourceIndex(0)
+5 >Emitted(23, 41) Source(21, 17) + SourceIndex(0)
+6 >Emitted(23, 50) Source(33, 6) + SourceIndex(0)
+---
+>>>        _this.dProp = function () { return _this; };
+1->^^^^^^^^
+2 >        ^^^^^^^^^^^
+3 >                   ^^^
+4 >                      ^^^^^^^^^^^^^^
+5 >                                    ^^^^^^^
+6 >                                           ^^^^^
+7 >                                                ^^
+8 >                                                  ^
+9 >                                                   ^
+1->
+2 >        dProp
+3 >                    = 
+4 >                      () => 
+5 >                                    
+6 >                                           this
+7 >                                                
+8 >                                                  this
+9 >                                                   ;
+1->Emitted(24, 9) Source(18, 5) + SourceIndex(0)
+2 >Emitted(24, 20) Source(18, 10) + SourceIndex(0)
+3 >Emitted(24, 23) Source(18, 13) + SourceIndex(0)
+4 >Emitted(24, 37) Source(18, 19) + SourceIndex(0)
+5 >Emitted(24, 44) Source(18, 19) + SourceIndex(0)
+6 >Emitted(24, 49) Source(18, 23) + SourceIndex(0)
+7 >Emitted(24, 51) Source(18, 19) + SourceIndex(0)
+8 >Emitted(24, 52) Source(18, 23) + SourceIndex(0)
+9 >Emitted(24, 53) Source(18, 24) + SourceIndex(0)
+---
+>>>        if (Math.random() < 0.5) {
+1 >^^^^^^^^
+2 >        ^^
+3 >          ^
+4 >           ^
+5 >            ^^^^
+6 >                ^
+7 >                 ^^^^^^
+8 >                       ^^
+9 >                         ^^^
+10>                            ^^^
+11>                               ^
+12>                                ^
+13>                                 ^
+1 >
+  >
+  >    constructor(a = 100) {
+  >        super(a);
+  >
+  >        
+2 >        if
+3 >           
+4 >           (
+5 >            Math
+6 >                .
+7 >                 random
+8 >                       ()
+9 >                          < 
+10>                            0.5
+11>                               )
+12>                                 
+13>                                 {
+1 >Emitted(25, 9) Source(23, 9) + SourceIndex(0)
+2 >Emitted(25, 11) Source(23, 11) + SourceIndex(0)
+3 >Emitted(25, 12) Source(23, 12) + SourceIndex(0)
+4 >Emitted(25, 13) Source(23, 13) + SourceIndex(0)
+5 >Emitted(25, 17) Source(23, 17) + SourceIndex(0)
+6 >Emitted(25, 18) Source(23, 18) + SourceIndex(0)
+7 >Emitted(25, 24) Source(23, 24) + SourceIndex(0)
+8 >Emitted(25, 26) Source(23, 26) + SourceIndex(0)
+9 >Emitted(25, 29) Source(23, 29) + SourceIndex(0)
+10>Emitted(25, 32) Source(23, 32) + SourceIndex(0)
+11>Emitted(25, 33) Source(23, 33) + SourceIndex(0)
+12>Emitted(25, 34) Source(23, 34) + SourceIndex(0)
+13>Emitted(25, 35) Source(23, 35) + SourceIndex(0)
+---
+>>>            "You win!";
+1 >^^^^^^^^^^^^
+2 >            ^^^^^^^^^^
+3 >                      ^
+1 >
+  >            
+2 >            "You win!"
+3 >                      
+1 >Emitted(26, 13) Source(24, 13) + SourceIndex(0)
+2 >Emitted(26, 23) Source(24, 23) + SourceIndex(0)
+3 >Emitted(26, 24) Source(24, 23) + SourceIndex(0)
+---
+>>>            return {
+1 >^^^^^^^^^^^^
+2 >            ^^^^^^
+3 >                  ^
+4 >                   ^^^^^^^->
+1 >
+  >            
+2 >            return
+3 >                   
+1 >Emitted(27, 13) Source(25, 13) + SourceIndex(0)
+2 >Emitted(27, 19) Source(25, 19) + SourceIndex(0)
+3 >Emitted(27, 20) Source(25, 20) + SourceIndex(0)
+---
+>>>                cProp: 1,
+1->^^^^^^^^^^^^^^^^
+2 >                ^^^^^
+3 >                     ^^
+4 >                       ^
+5 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1->{
+  >                
+2 >                cProp
+3 >                     : 
+4 >                       1
+1->Emitted(28, 17) Source(26, 17) + SourceIndex(0)
+2 >Emitted(28, 22) Source(26, 22) + SourceIndex(0)
+3 >Emitted(28, 24) Source(26, 24) + SourceIndex(0)
+4 >Emitted(28, 25) Source(26, 25) + SourceIndex(0)
+---
+>>>                dProp: function () { return _this; },
+1->^^^^^^^^^^^^^^^^
+2 >                ^^^^^
+3 >                     ^^
+4 >                       ^^^^^^^^^^^^^^
+5 >                                     ^^^^^^^
+6 >                                            ^^^^^
+7 >                                                 ^^
+8 >                                                   ^
+9 >                                                    ^^^^^^^^->
+1->,
+  >                
+2 >                dProp
+3 >                     : 
+4 >                       () => 
+5 >                                     
+6 >                                            this
+7 >                                                 
+8 >                                                   this
+1->Emitted(29, 17) Source(27, 17) + SourceIndex(0)
+2 >Emitted(29, 22) Source(27, 22) + SourceIndex(0)
+3 >Emitted(29, 24) Source(27, 24) + SourceIndex(0)
+4 >Emitted(29, 38) Source(27, 30) + SourceIndex(0)
+5 >Emitted(29, 45) Source(27, 30) + SourceIndex(0)
+6 >Emitted(29, 50) Source(27, 34) + SourceIndex(0)
+7 >Emitted(29, 52) Source(27, 30) + SourceIndex(0)
+8 >Emitted(29, 53) Source(27, 34) + SourceIndex(0)
+---
+>>>                foo: function () { return "You win!!!!!"; }
+1->^^^^^^^^^^^^^^^^
+2 >                ^^^
+3 >                   ^^^^^^^^^^^^^^^^
+4 >                                   ^^^^^^
+5 >                                         ^
+6 >                                          ^^^^^^^^^^^^^^
+7 >                                                        ^
+8 >                                                         ^
+9 >                                                          ^
+1->,
+  >                
+2 >                foo
+3 >                   () { 
+4 >                                   return
+5 >                                          
+6 >                                          "You win!!!!!"
+7 >                                                        
+8 >                                                          
+9 >                                                          }
+1->Emitted(30, 17) Source(28, 17) + SourceIndex(0)
+2 >Emitted(30, 20) Source(28, 20) + SourceIndex(0)
+3 >Emitted(30, 36) Source(28, 25) + SourceIndex(0)
+4 >Emitted(30, 42) Source(28, 31) + SourceIndex(0)
+5 >Emitted(30, 43) Source(28, 32) + SourceIndex(0)
+6 >Emitted(30, 57) Source(28, 46) + SourceIndex(0)
+7 >Emitted(30, 58) Source(28, 46) + SourceIndex(0)
+8 >Emitted(30, 59) Source(28, 47) + SourceIndex(0)
+9 >Emitted(30, 60) Source(28, 48) + SourceIndex(0)
+---
+>>>            };
+1 >^^^^^^^^^^^^^
+2 >             ^
+1 >
+  >            }
+2 >             ;
+1 >Emitted(31, 14) Source(29, 14) + SourceIndex(0)
+2 >Emitted(31, 15) Source(29, 15) + SourceIndex(0)
+---
+>>>        }
+1 >^^^^^^^^
+2 >        ^
+3 >         ^^^^->
+1 >
+  >        
+2 >        }
+1 >Emitted(32, 9) Source(30, 9) + SourceIndex(0)
+2 >Emitted(32, 10) Source(30, 10) + SourceIndex(0)
+---
+>>>        else
+1->^^^^^^^^
+2 >        ^^^^
+3 >            ^^^^^^^^^^^^^->
+1->
+  >        
+2 >        else
+1->Emitted(33, 9) Source(31, 9) + SourceIndex(0)
+2 >Emitted(33, 13) Source(31, 13) + SourceIndex(0)
+---
+>>>            return null;
+1->^^^^^^^^^^^^
+2 >            ^^^^^^
+3 >                  ^
+4 >                   ^^^^
+5 >                       ^
+1->
+  >            
+2 >            return
+3 >                   
+4 >                   null
+5 >                       ;
+1->Emitted(34, 13) Source(32, 13) + SourceIndex(0)
+2 >Emitted(34, 19) Source(32, 19) + SourceIndex(0)
+3 >Emitted(34, 20) Source(32, 20) + SourceIndex(0)
+4 >Emitted(34, 24) Source(32, 24) + SourceIndex(0)
+5 >Emitted(34, 25) Source(32, 25) + SourceIndex(0)
+---
+>>>        return _this;
+>>>    }
+1 >^^^^
+2 >    ^
+3 >     ^^^^^^^^^->
+1 >
+  >    
+2 >    }
+1 >Emitted(36, 5) Source(33, 5) + SourceIndex(0)
+2 >Emitted(36, 6) Source(33, 6) + SourceIndex(0)
+---
+>>>    return D;
+1->^^^^
+2 >    ^^^^^^^^
+1->
+  >
+2 >    }
+1->Emitted(37, 5) Source(34, 1) + SourceIndex(0)
+2 >Emitted(37, 13) Source(34, 2) + SourceIndex(0)
+---
+>>>}(C));
+1 >
+2 >^
+3 > 
+4 > ^
+5 >  ^
+6 >   ^^^
+7 >      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+2 >}
+3 > 
+4 > class D extends 
+5 >  C
+6 >    {
+  >       dProp = () => this;
+  >   
+  >       constructor(a = 100) {
+  >           super(a);
+  >   
+  >           if (Math.random() < 0.5) {
+  >               "You win!"
+  >               return {
+  >                   cProp: 1,
+  >                   dProp: () => this,
+  >                   foo() { return "You win!!!!!" }
+  >               };
+  >           }
+  >           else
+  >               return null;
+  >       }
+  >   }
+1 >Emitted(38, 1) Source(34, 1) + SourceIndex(0)
+2 >Emitted(38, 2) Source(34, 2) + SourceIndex(0)
+3 >Emitted(38, 2) Source(17, 1) + SourceIndex(0)
+4 >Emitted(38, 3) Source(17, 17) + SourceIndex(0)
+5 >Emitted(38, 4) Source(17, 18) + SourceIndex(0)
+6 >Emitted(38, 7) Source(34, 2) + SourceIndex(0)
+---
+>>>//# sourceMappingURL=derivedClassConstructorWithExplicitReturns01.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.symbols b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.symbols
new file mode 100644
index 0000000000000..ee043fcfe712d
--- /dev/null
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.symbols
@@ -0,0 +1,66 @@
+=== tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts ===
+
+class C {
+>C : Symbol(C, Decl(derivedClassConstructorWithExplicitReturns01.ts, 0, 0))
+
+    cProp = 10;
+>cProp : Symbol(C.cProp, Decl(derivedClassConstructorWithExplicitReturns01.ts, 1, 9))
+
+    foo() { return "this never gets used."; }
+>foo : Symbol(C.foo, Decl(derivedClassConstructorWithExplicitReturns01.ts, 2, 15))
+
+    constructor(value: number) {
+>value : Symbol(value, Decl(derivedClassConstructorWithExplicitReturns01.ts, 6, 16))
+
+        return {
+            cProp: value,
+>cProp : Symbol(cProp, Decl(derivedClassConstructorWithExplicitReturns01.ts, 7, 16))
+>value : Symbol(value, Decl(derivedClassConstructorWithExplicitReturns01.ts, 6, 16))
+
+            foo() {
+>foo : Symbol(foo, Decl(derivedClassConstructorWithExplicitReturns01.ts, 8, 25))
+
+                return "well this looks kinda C-ish.";
+            }
+        }
+    }
+}
+
+class D extends C {
+>D : Symbol(D, Decl(derivedClassConstructorWithExplicitReturns01.ts, 14, 1))
+>C : Symbol(C, Decl(derivedClassConstructorWithExplicitReturns01.ts, 0, 0))
+
+    dProp = () => this;
+>dProp : Symbol(D.dProp, Decl(derivedClassConstructorWithExplicitReturns01.ts, 16, 19))
+>this : Symbol(D, Decl(derivedClassConstructorWithExplicitReturns01.ts, 14, 1))
+
+    constructor(a = 100) {
+>a : Symbol(a, Decl(derivedClassConstructorWithExplicitReturns01.ts, 19, 16))
+
+        super(a);
+>super : Symbol(C, Decl(derivedClassConstructorWithExplicitReturns01.ts, 0, 0))
+>a : Symbol(a, Decl(derivedClassConstructorWithExplicitReturns01.ts, 19, 16))
+
+        if (Math.random() < 0.5) {
+>Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+
+            "You win!"
+            return {
+                cProp: 1,
+>cProp : Symbol(cProp, Decl(derivedClassConstructorWithExplicitReturns01.ts, 24, 20))
+
+                dProp: () => this,
+>dProp : Symbol(dProp, Decl(derivedClassConstructorWithExplicitReturns01.ts, 25, 25))
+>this : Symbol(D, Decl(derivedClassConstructorWithExplicitReturns01.ts, 14, 1))
+
+                foo() { return "You win!!!!!" }
+>foo : Symbol(foo, Decl(derivedClassConstructorWithExplicitReturns01.ts, 26, 34))
+
+            };
+        }
+        else
+            return null;
+    }
+}
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types
new file mode 100644
index 0000000000000..aa3b1ec7fbf47
--- /dev/null
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types
@@ -0,0 +1,85 @@
+=== tests/cases/compiler/derivedClassConstructorWithExplicitReturns01.ts ===
+
+class C {
+>C : C
+
+    cProp = 10;
+>cProp : number
+>10 : number
+
+    foo() { return "this never gets used."; }
+>foo : () => string
+>"this never gets used." : string
+
+    constructor(value: number) {
+>value : number
+
+        return {
+>{            cProp: value,            foo() {                return "well this looks kinda C-ish.";            }        } : { cProp: number; foo(): string; }
+
+            cProp: value,
+>cProp : number
+>value : number
+
+            foo() {
+>foo : () => string
+
+                return "well this looks kinda C-ish.";
+>"well this looks kinda C-ish." : string
+            }
+        }
+    }
+}
+
+class D extends C {
+>D : D
+>C : C
+
+    dProp = () => this;
+>dProp : () => this
+>() => this : () => this
+>this : this
+
+    constructor(a = 100) {
+>a : number
+>100 : number
+
+        super(a);
+>super(a) : void
+>super : typeof C
+>a : number
+
+        if (Math.random() < 0.5) {
+>Math.random() < 0.5 : boolean
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+>0.5 : number
+
+            "You win!"
+>"You win!" : string
+
+            return {
+>{                cProp: 1,                dProp: () => this,                foo() { return "You win!!!!!" }            } : { cProp: number; dProp: () => this; foo(): string; }
+
+                cProp: 1,
+>cProp : number
+>1 : number
+
+                dProp: () => this,
+>dProp : () => this
+>() => this : () => this
+>this : this
+
+                foo() { return "You win!!!!!" }
+>foo : () => string
+>"You win!!!!!" : string
+
+            };
+        }
+        else
+            return null;
+>null : null
+    }
+}

From c87a773a462daba914c05fcb28617d632847a02c Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 01:10:38 -0700
Subject: [PATCH 17/39] Don't emit a return statement at the end in most useful
 cases.

---
 src/compiler/transformers/es6.ts | 34 +++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 44089326f7f1d..aa62af361dba8 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -804,7 +804,9 @@ namespace ts {
                 addRange(statements, body);
             }
 
-            if (extendsClauseElement) {
+            // Return `_this` unless we're sure enough that it would be pointless to add a return statement.
+            // If there's a constructor that we can tell returns in enough places, then we *do not* want to add a return.
+            if (extendsClauseElement && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
                 statements.push(
                     createReturn(
                         createIdentifier("_this")
@@ -833,6 +835,36 @@ namespace ts {
             return constructor => visitNodes(constructor.body.statements, visitor, isStatement, /*start*/ offset);
         }
 
+        /**
+         * We want to try to avoid emitting a return statement in certain cases if a user already returned something.
+         * It would be pointless and generate dead code, so we'll try to make things a little bit prettier
+         * by doing a minimal check on whether some common patterns always explicitly return.
+         */
+        function isSufficientlyCoveredByReturnStatements(statement: Statement): boolean {
+            // A return statement is considered covered.
+            if (statement.kind === SyntaxKind.ReturnStatement) {
+                return true;
+            }
+
+            // An if-statement with two covered branches is covered.
+            else if (statement.kind === SyntaxKind.IfStatement) {
+                const ifStatement = statement as IfStatement;
+                if (ifStatement.elseStatement) {
+                    return isSufficientlyCoveredByReturnStatements(ifStatement.thenStatement) &&
+                        isSufficientlyCoveredByReturnStatements(ifStatement.elseStatement);
+                }
+            }
+            // A block is covered if it has a last statement which is covered.
+            else if (statement.kind === SyntaxKind.Block) {
+                const lastStatement = lastOrUndefined((statement as Block).statements);
+                if (lastStatement && isSufficientlyCoveredByReturnStatements(lastStatement)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         /**
          * Adds a synthesized call to `_super` if it is needed.
          *

From d144665b4f6637b8184725c74a7b60e894b81617 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Sat, 3 Sep 2016 01:13:58 -0700
Subject: [PATCH 18/39] Accepted baselines.

---
 tests/baselines/reference/classExtendsNull.js |  2 --
 ...ctorFunctionTypeIsAssignableToBaseType2.js |  1 -
 ...edClassConstructorWithExplicitReturns01.js |  1 -
 ...assConstructorWithExplicitReturns01.js.map |  2 +-
 ...tructorWithExplicitReturns01.sourcemap.txt | 21 +++++++++----------
 .../reference/returnInConstructor1.js         |  2 --
 6 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/tests/baselines/reference/classExtendsNull.js b/tests/baselines/reference/classExtendsNull.js
index a820b525aabb1..1eeb5172caddb 100644
--- a/tests/baselines/reference/classExtendsNull.js
+++ b/tests/baselines/reference/classExtendsNull.js
@@ -23,7 +23,6 @@ var C = (function (_super) {
     function C() {
         var _this = _super.call(this) || this;
         return Object.create(null);
-        return _this;
     }
     return C;
 }(null));
@@ -32,7 +31,6 @@ var D = (function (_super) {
     function D() {
         var _this;
         return Object.create(null);
-        return _this;
     }
     return D;
 }(null));
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index 1ae239430c700..a60eb4de05662 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -58,7 +58,6 @@ var Derived2 = (function (_super) {
     function Derived2(x) {
         var _this = _super.call(this, x) || this;
         return 1;
-        return _this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
index de1e409b55fc7..4ab447d8e3231 100644
--- a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js
@@ -69,7 +69,6 @@ var D = (function (_super) {
         }
         else
             return null;
-        return _this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
index dd7aedd1a9863..8b9037e40c95f 100644
--- a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.js.map
@@ -1,2 +1,2 @@
 //// [derivedClassConstructorWithExplicitReturns01.js.map]
-{"version":3,"file":"derivedClassConstructorWithExplicitReturns01.js","sourceRoot":"","sources":["derivedClassConstructorWithExplicitReturns01.ts"],"names":[],"mappings":";;;;;AACA;IAKI,WAAY,KAAa;QAJzB,UAAK,GAAG,EAAE,CAAC;QAKP,MAAM,CAAC;YACH,KAAK,EAAE,KAAK;YACZ,GAAG;gBACC,MAAM,CAAC,8BAA8B,CAAC;YAC1C,CAAC;SACJ,CAAA;IACL,CAAC;IATD,eAAG,GAAH,cAAQ,MAAM,CAAC,uBAAuB,CAAC,CAAC,CAAC;IAU7C,QAAC;AAAD,CAAC,AAbD,IAaC;AAED;IAAgB,qBAAC;IAGb,WAAY,CAAO;QAAP,kBAAA,EAAA,OAAO;QAAnB,YACI,kBAAM,CAAC,CAAC,SAYX;QAfD,WAAK,GAAG,cAAM,OAAA,KAAI,EAAJ,CAAI,CAAC;QAKf,EAAE,CAAC,CAAC,IAAI,CAAC,MAAM,EAAE,GAAG,GAAG,CAAC,CAAC,CAAC;YACtB,UAAU,CAAA;YACV,MAAM,CAAC;gBACH,KAAK,EAAE,CAAC;gBACR,KAAK,EAAE,cAAM,OAAA,KAAI,EAAJ,CAAI;gBACjB,GAAG,gBAAK,MAAM,CAAC,cAAc,CAAA,CAAC,CAAC;aAClC,CAAC;QACN,CAAC;QACD,IAAI;YACA,MAAM,CAAC,IAAI,CAAC;;IACpB,CAAC;IACL,QAAC;AAAD,CAAC,AAjBD,CAAgB,CAAC,GAiBhB"}
\ No newline at end of file
+{"version":3,"file":"derivedClassConstructorWithExplicitReturns01.js","sourceRoot":"","sources":["derivedClassConstructorWithExplicitReturns01.ts"],"names":[],"mappings":";;;;;AACA;IAKI,WAAY,KAAa;QAJzB,UAAK,GAAG,EAAE,CAAC;QAKP,MAAM,CAAC;YACH,KAAK,EAAE,KAAK;YACZ,GAAG;gBACC,MAAM,CAAC,8BAA8B,CAAC;YAC1C,CAAC;SACJ,CAAA;IACL,CAAC;IATD,eAAG,GAAH,cAAQ,MAAM,CAAC,uBAAuB,CAAC,CAAC,CAAC;IAU7C,QAAC;AAAD,CAAC,AAbD,IAaC;AAED;IAAgB,qBAAC;IAGb,WAAY,CAAO;QAAP,kBAAA,EAAA,OAAO;QAAnB,YACI,kBAAM,CAAC,CAAC,SAYX;QAfD,WAAK,GAAG,cAAM,OAAA,KAAI,EAAJ,CAAI,CAAC;QAKf,EAAE,CAAC,CAAC,IAAI,CAAC,MAAM,EAAE,GAAG,GAAG,CAAC,CAAC,CAAC;YACtB,UAAU,CAAA;YACV,MAAM,CAAC;gBACH,KAAK,EAAE,CAAC;gBACR,KAAK,EAAE,cAAM,OAAA,KAAI,EAAJ,CAAI;gBACjB,GAAG,gBAAK,MAAM,CAAC,cAAc,CAAA,CAAC,CAAC;aAClC,CAAC;QACN,CAAC;QACD,IAAI;YACA,MAAM,CAAC,IAAI,CAAC;IACpB,CAAC;IACL,QAAC;AAAD,CAAC,AAjBD,CAAgB,CAAC,GAiBhB"}
\ No newline at end of file
diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
index 5f41ab5630055..d452115ceb70e 100644
--- a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.sourcemap.txt
@@ -522,7 +522,6 @@ sourceFile:derivedClassConstructorWithExplicitReturns01.ts
 4 >Emitted(34, 24) Source(32, 24) + SourceIndex(0)
 5 >Emitted(34, 25) Source(32, 25) + SourceIndex(0)
 ---
->>>        return _this;
 >>>    }
 1 >^^^^
 2 >    ^
@@ -530,8 +529,8 @@ sourceFile:derivedClassConstructorWithExplicitReturns01.ts
 1 >
   >    
 2 >    }
-1 >Emitted(36, 5) Source(33, 5) + SourceIndex(0)
-2 >Emitted(36, 6) Source(33, 6) + SourceIndex(0)
+1 >Emitted(35, 5) Source(33, 5) + SourceIndex(0)
+2 >Emitted(35, 6) Source(33, 6) + SourceIndex(0)
 ---
 >>>    return D;
 1->^^^^
@@ -539,8 +538,8 @@ sourceFile:derivedClassConstructorWithExplicitReturns01.ts
 1->
   >
 2 >    }
-1->Emitted(37, 5) Source(34, 1) + SourceIndex(0)
-2 >Emitted(37, 13) Source(34, 2) + SourceIndex(0)
+1->Emitted(36, 5) Source(34, 1) + SourceIndex(0)
+2 >Emitted(36, 13) Source(34, 2) + SourceIndex(0)
 ---
 >>>}(C));
 1 >
@@ -573,11 +572,11 @@ sourceFile:derivedClassConstructorWithExplicitReturns01.ts
   >               return null;
   >       }
   >   }
-1 >Emitted(38, 1) Source(34, 1) + SourceIndex(0)
-2 >Emitted(38, 2) Source(34, 2) + SourceIndex(0)
-3 >Emitted(38, 2) Source(17, 1) + SourceIndex(0)
-4 >Emitted(38, 3) Source(17, 17) + SourceIndex(0)
-5 >Emitted(38, 4) Source(17, 18) + SourceIndex(0)
-6 >Emitted(38, 7) Source(34, 2) + SourceIndex(0)
+1 >Emitted(37, 1) Source(34, 1) + SourceIndex(0)
+2 >Emitted(37, 2) Source(34, 2) + SourceIndex(0)
+3 >Emitted(37, 2) Source(17, 1) + SourceIndex(0)
+4 >Emitted(37, 3) Source(17, 17) + SourceIndex(0)
+5 >Emitted(37, 4) Source(17, 18) + SourceIndex(0)
+6 >Emitted(37, 7) Source(34, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=derivedClassConstructorWithExplicitReturns01.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/returnInConstructor1.js b/tests/baselines/reference/returnInConstructor1.js
index 6c678db235880..a47fa7ed51357 100644
--- a/tests/baselines/reference/returnInConstructor1.js
+++ b/tests/baselines/reference/returnInConstructor1.js
@@ -125,7 +125,6 @@ var H = (function (_super) {
     function H() {
         var _this = _super.call(this) || this;
         return new G(); //error
-        return _this;
     }
     return H;
 }(F));
@@ -134,7 +133,6 @@ var I = (function (_super) {
     function I() {
         var _this = _super.call(this) || this;
         return new G();
-        return _this;
     }
     return I;
 }(G));

From b476815f76eac2cbc3704fa91be5e22ef76fff8b Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 6 Sep 2016 11:31:20 -0700
Subject: [PATCH 19/39] Added test for '_this'.

---
 .../underscoreThisInDerivedClass01.ts         | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 tests/cases/compiler/underscoreThisInDerivedClass01.ts

diff --git a/tests/cases/compiler/underscoreThisInDerivedClass01.ts b/tests/cases/compiler/underscoreThisInDerivedClass01.ts
new file mode 100644
index 0000000000000..0d3f5849cb157
--- /dev/null
+++ b/tests/cases/compiler/underscoreThisInDerivedClass01.ts
@@ -0,0 +1,23 @@
+// @target es5
+
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+
+class C {
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+    constructor() {
+        var _this = "uh-oh?";
+        super();
+    }
+}
\ No newline at end of file

From 230737fb95db3af9d3c686328cbf5130f7529992 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 6 Sep 2016 11:33:40 -0700
Subject: [PATCH 20/39] Accepted baselines.

---
 .../underscoreThisInDerivedClass01.js         | 56 +++++++++++++++++++
 .../underscoreThisInDerivedClass01.symbols    | 32 +++++++++++
 .../underscoreThisInDerivedClass01.types      | 35 ++++++++++++
 3 files changed, 123 insertions(+)
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass01.js
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass01.symbols
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass01.types

diff --git a/tests/baselines/reference/underscoreThisInDerivedClass01.js b/tests/baselines/reference/underscoreThisInDerivedClass01.js
new file mode 100644
index 0000000000000..000176c213f48
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass01.js
@@ -0,0 +1,56 @@
+//// [underscoreThisInDerivedClass01.ts]
+// @target es5
+
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+
+class C {
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+    constructor() {
+        var _this = "uh-oh?";
+        super();
+    }
+}
+
+//// [underscoreThisInDerivedClass01.js]
+// @target es5
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+var C = (function () {
+    function C() {
+        return {};
+    }
+    return C;
+}());
+var D = (function (_super) {
+    __extends(D, _super);
+    function D() {
+        var _this;
+        var _this = "uh-oh?";
+        _this = _super.call(this) || this;
+        return _this;
+    }
+    return D;
+}(C));
diff --git a/tests/baselines/reference/underscoreThisInDerivedClass01.symbols b/tests/baselines/reference/underscoreThisInDerivedClass01.symbols
new file mode 100644
index 0000000000000..c05cd4f6fc327
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass01.symbols
@@ -0,0 +1,32 @@
+=== tests/cases/compiler/underscoreThisInDerivedClass01.ts ===
+// @target es5
+
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+
+class C {
+>C : Symbol(C, Decl(underscoreThisInDerivedClass01.ts, 0, 0))
+
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+>D : Symbol(D, Decl(underscoreThisInDerivedClass01.ts, 15, 1))
+>C : Symbol(C, Decl(underscoreThisInDerivedClass01.ts, 0, 0))
+
+    constructor() {
+        var _this = "uh-oh?";
+>_this : Symbol(_this, Decl(underscoreThisInDerivedClass01.ts, 19, 11))
+
+        super();
+>super : Symbol(C, Decl(underscoreThisInDerivedClass01.ts, 0, 0))
+    }
+}
diff --git a/tests/baselines/reference/underscoreThisInDerivedClass01.types b/tests/baselines/reference/underscoreThisInDerivedClass01.types
new file mode 100644
index 0000000000000..b07f3e0efbf8a
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass01.types
@@ -0,0 +1,35 @@
+=== tests/cases/compiler/underscoreThisInDerivedClass01.ts ===
+// @target es5
+
+// Original test intent:
+// When arrow functions capture 'this', the lexical 'this' owner
+// currently captures 'this' using a variable named '_this'.
+// That means that '_this' becomes a reserved identifier in certain places.
+//
+// Constructors have adopted the same identifier name ('_this')
+// for capturing any potential return values from super calls,
+// so we expect the same behavior.
+
+class C {
+>C : C
+
+    constructor() {
+        return {};
+>{} : {}
+    }
+}
+
+class D extends C {
+>D : D
+>C : C
+
+    constructor() {
+        var _this = "uh-oh?";
+>_this : string
+>"uh-oh?" : string
+
+        super();
+>super() : void
+>super : typeof C
+    }
+}

From b11db57c3209f75feca0f98473ec24296b039e29 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Wed, 7 Sep 2016 12:23:06 -0700
Subject: [PATCH 21/39] Mark constructors as this-capturing if they are defined
 in a derived class.

---
 src/compiler/checker.ts   | 6 +++++-
 src/compiler/utilities.ts | 8 ++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 81f22e2f1921d..9cb18f7c48842 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9215,14 +9215,18 @@ namespace ts {
             let container = getSuperContainer(node, /*stopOnFunctions*/ true);
             let needToCaptureLexicalThis = false;
 
+            // adjust the container reference in case if super is used inside arrow functions with arbitrarily deep nesting
             if (!isCallExpression) {
-                // adjust the container reference in case if super is used inside arrow functions with arbitrary deep nesting
                 while (container && container.kind === SyntaxKind.ArrowFunction) {
                     container = getSuperContainer(container, /*stopOnFunctions*/ true);
                     needToCaptureLexicalThis = languageVersion < ScriptTarget.ES6;
                 }
             }
 
+            if (languageVersion < ScriptTarget.ES6 && container && container.kind === SyntaxKind.Constructor) {
+                needToCaptureLexicalThis = needToCaptureLexicalThis || !!getClassExtendsHeritageClauseElement(getContainingClass(container));
+            }
+
             const canUseSuperExpression = isLegalUsageOfSuperExpression(container);
             let nodeCheckFlag: NodeCheckFlags = 0;
 
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 030a3a33871ad..5d10c3c4c6773 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -1032,11 +1032,11 @@ namespace ts {
     }
 
     /**
-      * Given an super call\property node returns a closest node where either
-      * - super call\property is legal in the node and not legal in the parent node the node.
+      * Given an super call/property node, returns the closest node where
+      * - a super call/property access is legal in the node and not legal in the parent node the node.
       *   i.e. super call is legal in constructor but not legal in the class body.
-      * - node is arrow function (so caller might need to call getSuperContainer in case it needs to climb higher)
-      * - super call\property is definitely illegal in the node (but might be legal in some subnode)
+      * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+      * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
       *   i.e. super property access is illegal in function declaration but can be legal in the statement list
       */
     export function getSuperContainer(node: Node, stopOnFunctions: boolean): Node {

From 3a5fb0cec6e7db434a12043909bc12bc5866a5ec Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Wed, 7 Sep 2016 17:10:49 -0700
Subject: [PATCH 22/39] Accepted baselines.

---
 .../noImplicitAnyMissingGetAccessor.js        |  3 +-
 .../noImplicitAnyMissingSetAccessor.js        |  3 +-
 .../underscoreThisInDerivedClass01.errors.txt | 29 +++++++++++++++++++
 3 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass01.errors.txt

diff --git a/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js b/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
index 69d98d4b0c6f8..d0e87aba25bf6 100644
--- a/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
+++ b/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
@@ -26,7 +26,8 @@ var Parent = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(Child.prototype, "message", {
         set: function (str) {
diff --git a/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js b/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
index 7ad703fd3b72d..1b4119227bc5c 100644
--- a/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
+++ b/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
@@ -25,7 +25,8 @@ var Parent = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        _super.apply(this, arguments);
+        var _this = _super.apply(this, arguments) || this;
+        return _this;
     }
     Object.defineProperty(Child.prototype, "message", {
         get: function () {
diff --git a/tests/baselines/reference/underscoreThisInDerivedClass01.errors.txt b/tests/baselines/reference/underscoreThisInDerivedClass01.errors.txt
new file mode 100644
index 0000000000000..3828825cb6b82
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass01.errors.txt
@@ -0,0 +1,29 @@
+tests/cases/compiler/underscoreThisInDerivedClass01.ts(20,13): error TS2399: Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference.
+
+
+==== tests/cases/compiler/underscoreThisInDerivedClass01.ts (1 errors) ====
+    // @target es5
+    
+    // Original test intent:
+    // When arrow functions capture 'this', the lexical 'this' owner
+    // currently captures 'this' using a variable named '_this'.
+    // That means that '_this' becomes a reserved identifier in certain places.
+    //
+    // Constructors have adopted the same identifier name ('_this')
+    // for capturing any potential return values from super calls,
+    // so we expect the same behavior.
+    
+    class C {
+        constructor() {
+            return {};
+        }
+    }
+    
+    class D extends C {
+        constructor() {
+            var _this = "uh-oh?";
+                ~~~~~
+!!! error TS2399: Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference.
+            super();
+        }
+    }
\ No newline at end of file

From f11c64648adb5f51decca90c2882d80ffbf93cf2 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Wed, 7 Sep 2016 17:30:51 -0700
Subject: [PATCH 23/39] Added missing semicolons.

---
 src/compiler/transformers/es6.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index aa62af361dba8..a419170769bff 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -2656,10 +2656,10 @@ namespace ts {
                     createLogicalOr(
                         resultingCall,
                         actualThis
-                    )
+                    );
                 return assignToCapturedThis
                     ? createAssignment(createIdentifier("_this"), initializer)
-                    : initializer
+                    : initializer;
             }
             return resultingCall;
         }

From 138e18c3c905c85b13a16e85f7f69e5c3a4d9e3e Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Mon, 19 Sep 2016 18:30:35 +0300
Subject: [PATCH 24/39] Accepted baselines.

---
 ...edClassConstructorWithExplicitReturns01.types | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types
index aa3b1ec7fbf47..d361e783ef0fc 100644
--- a/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types
+++ b/tests/baselines/reference/derivedClassConstructorWithExplicitReturns01.types
@@ -5,11 +5,11 @@ class C {
 
     cProp = 10;
 >cProp : number
->10 : number
+>10 : 10
 
     foo() { return "this never gets used."; }
 >foo : () => string
->"this never gets used." : string
+>"this never gets used." : "this never gets used."
 
     constructor(value: number) {
 >value : number
@@ -25,7 +25,7 @@ class C {
 >foo : () => string
 
                 return "well this looks kinda C-ish.";
->"well this looks kinda C-ish." : string
+>"well this looks kinda C-ish." : "well this looks kinda C-ish."
             }
         }
     }
@@ -42,7 +42,7 @@ class D extends C {
 
     constructor(a = 100) {
 >a : number
->100 : number
+>100 : 100
 
         super(a);
 >super(a) : void
@@ -55,17 +55,17 @@ class D extends C {
 >Math.random : () => number
 >Math : Math
 >random : () => number
->0.5 : number
+>0.5 : 0.5
 
             "You win!"
->"You win!" : string
+>"You win!" : "You win!"
 
             return {
 >{                cProp: 1,                dProp: () => this,                foo() { return "You win!!!!!" }            } : { cProp: number; dProp: () => this; foo(): string; }
 
                 cProp: 1,
 >cProp : number
->1 : number
+>1 : 1
 
                 dProp: () => this,
 >dProp : () => this
@@ -74,7 +74,7 @@ class D extends C {
 
                 foo() { return "You win!!!!!" }
 >foo : () => string
->"You win!!!!!" : string
+>"You win!!!!!" : "You win!!!!!"
 
             };
         }

From da298132048f58942a809561325a4bdd1d965aa1 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Mon, 19 Sep 2016 18:01:32 +0300
Subject: [PATCH 25/39] Added test and comment.

---
 src/compiler/checker.ts                         |  1 +
 .../compiler/underscoreThisInDerivedClass02.ts  | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 tests/cases/compiler/underscoreThisInDerivedClass02.ts

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 7d007950c93e5..20fb56870dac0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9322,6 +9322,7 @@ namespace ts {
                 }
             }
 
+            // Even if 'super' isn't ever actually called, we may need to capture 'this' for a derived class.
             if (languageVersion < ScriptTarget.ES6 && container && container.kind === SyntaxKind.Constructor) {
                 needToCaptureLexicalThis = needToCaptureLexicalThis || !!getClassExtendsHeritageClauseElement(getContainingClass(container));
             }
diff --git a/tests/cases/compiler/underscoreThisInDerivedClass02.ts b/tests/cases/compiler/underscoreThisInDerivedClass02.ts
new file mode 100644
index 0000000000000..da197258a7348
--- /dev/null
+++ b/tests/cases/compiler/underscoreThisInDerivedClass02.ts
@@ -0,0 +1,17 @@
+// @target es5
+
+// Original test intent:
+// Errors on '_this' should be reported in derived constructors,
+// even if 'super()' is not called.
+
+class C {
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+    constructor() {
+        var _this = "uh-oh?";
+    }
+}
\ No newline at end of file

From 60bcd7e0d009090170a7fa48580359cfb14e80c7 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Mon, 19 Sep 2016 18:05:34 +0300
Subject: [PATCH 26/39] Accepted baselines.

---
 .../underscoreThisInDerivedClass02.errors.txt | 25 +++++++++++
 .../underscoreThisInDerivedClass02.js         | 44 +++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
 create mode 100644 tests/baselines/reference/underscoreThisInDerivedClass02.js

diff --git a/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt b/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
new file mode 100644
index 0000000000000..f7e0494c884f6
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
@@ -0,0 +1,25 @@
+tests/cases/compiler/underscoreThisInDerivedClass02.ts(14,5): error TS2377: Constructors for derived classes must contain a 'super' call.
+
+
+==== tests/cases/compiler/underscoreThisInDerivedClass02.ts (1 errors) ====
+    // @target es5
+    
+    // Original test intent:
+    // Errors on '_this' should be reported in derived constructors,
+    // even if 'super()' is not called.
+    
+    class C {
+        constructor() {
+            return {};
+        }
+    }
+    
+    class D extends C {
+        constructor() {
+        ~~~~~~~~~~~~~~~
+            var _this = "uh-oh?";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+        }
+    ~~~~~
+!!! error TS2377: Constructors for derived classes must contain a 'super' call.
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/underscoreThisInDerivedClass02.js b/tests/baselines/reference/underscoreThisInDerivedClass02.js
new file mode 100644
index 0000000000000..c1e9494376b53
--- /dev/null
+++ b/tests/baselines/reference/underscoreThisInDerivedClass02.js
@@ -0,0 +1,44 @@
+//// [underscoreThisInDerivedClass02.ts]
+// @target es5
+
+// Original test intent:
+// Errors on '_this' should be reported in derived constructors,
+// even if 'super()' is not called.
+
+class C {
+    constructor() {
+        return {};
+    }
+}
+
+class D extends C {
+    constructor() {
+        var _this = "uh-oh?";
+    }
+}
+
+//// [underscoreThisInDerivedClass02.js]
+// @target es5
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+// Original test intent:
+// Errors on '_this' should be reported in derived constructors,
+// even if 'super()' is not called.
+var C = (function () {
+    function C() {
+        return {};
+    }
+    return C;
+}());
+var D = (function (_super) {
+    __extends(D, _super);
+    function D() {
+        var _this;
+        var _this = "uh-oh?";
+        return _this;
+    }
+    return D;
+}(C));

From 5b3a93db2fca4f8197dee1b979a3e22b282da697 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Mon, 19 Sep 2016 18:29:15 +0300
Subject: [PATCH 27/39] Always mark derived constructors as 'this'-capturing.

---
 src/compiler/checker.ts | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 20fb56870dac0..29270628fb073 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9322,11 +9322,6 @@ namespace ts {
                 }
             }
 
-            // Even if 'super' isn't ever actually called, we may need to capture 'this' for a derived class.
-            if (languageVersion < ScriptTarget.ES6 && container && container.kind === SyntaxKind.Constructor) {
-                needToCaptureLexicalThis = needToCaptureLexicalThis || !!getClassExtendsHeritageClauseElement(getContainingClass(container));
-            }
-
             const canUseSuperExpression = isLegalUsageOfSuperExpression(container);
             let nodeCheckFlag: NodeCheckFlags = 0;
 
@@ -14312,6 +14307,7 @@ namespace ts {
             // constructors of derived classes must contain at least one super call somewhere in their function body.
             const containingClassDecl = <ClassDeclaration>node.parent;
             if (getClassExtendsHeritageClauseElement(containingClassDecl)) {
+                captureLexicalThis(node.parent, containingClassDecl);
                 const classExtendsNull = classDeclarationExtendsNull(containingClassDecl);
                 const superCall = getSuperCallInConstructor(node);
                 if (superCall) {

From bc4cf6d3c06a7dbb6d5bffa728de163788c3d83f Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Mon, 19 Sep 2016 18:30:15 +0300
Subject: [PATCH 28/39] Accepted baselines.

---
 .../reference/underscoreThisInDerivedClass02.errors.txt      | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt b/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
index f7e0494c884f6..5569ebf1af6fb 100644
--- a/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
+++ b/tests/baselines/reference/underscoreThisInDerivedClass02.errors.txt
@@ -1,7 +1,8 @@
 tests/cases/compiler/underscoreThisInDerivedClass02.ts(14,5): error TS2377: Constructors for derived classes must contain a 'super' call.
+tests/cases/compiler/underscoreThisInDerivedClass02.ts(15,13): error TS2399: Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference.
 
 
-==== tests/cases/compiler/underscoreThisInDerivedClass02.ts (1 errors) ====
+==== tests/cases/compiler/underscoreThisInDerivedClass02.ts (2 errors) ====
     // @target es5
     
     // Original test intent:
@@ -19,6 +20,8 @@ tests/cases/compiler/underscoreThisInDerivedClass02.ts(14,5): error TS2377: Cons
         ~~~~~~~~~~~~~~~
             var _this = "uh-oh?";
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+                ~~~~~
+!!! error TS2399: Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference.
         }
     ~~~~~
 !!! error TS2377: Constructors for derived classes must contain a 'super' call.

From dc58fb5558a29794cea65b0c5e6e684f2354a75e Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 20 Sep 2016 12:29:13 -0400
Subject: [PATCH 29/39] Immediately return the result of super calls when they
 are the first & last statement in a constructor.

---
 src/compiler/transformers/es6.ts | 119 +++++++++++++++++++++----------
 1 file changed, 83 insertions(+), 36 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 535e9162a3aba..5748739cb236f 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -139,6 +139,30 @@ namespace ts {
         loopOutParameters?: LoopOutParameter[];
     }
 
+    const enum SuperCaptureResult {
+        /**
+         * A capture may have been added for calls to 'super', but
+         * the caller should emit subsequent statements normally.
+         */
+        NoReplacement,
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  var _this = _super.call(...) || this;
+         *
+         * Callers should skip the current statement.
+         */
+        ReplaceSuperCapture,
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  return _super.call(...) || this;
+         *
+         * Callers should skip the current statement and avoid any returns of '_this'.
+         */
+        ReplaceWithReturn,
+}
+
     export function transformES6(context: TransformationContext) {
         const {
             startLexicalEnvironment,
@@ -814,6 +838,7 @@ namespace ts {
             startLexicalEnvironment();
 
             let statementOffset = -1;
+            let thisCaptureStatus: SuperCaptureResult | undefined;
             if (hasSynthesizedSuper) {
                 // If a super call has already been synthesized,
                 // we're going to assume that we should just transform everything after that.
@@ -829,7 +854,11 @@ namespace ts {
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
                 Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
-                statementOffset = declareOrCaptureThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
+
+                thisCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
+                if (thisCaptureStatus === SuperCaptureResult.ReplaceSuperCapture || thisCaptureStatus === SuperCaptureResult.ReplaceWithReturn) {
+                    statementOffset++;
+                }
             }
 
             addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
@@ -841,7 +870,9 @@ namespace ts {
 
             // Return `_this` unless we're sure enough that it would be pointless to add a return statement.
             // If there's a constructor that we can tell returns in enough places, then we *do not* want to add a return.
-            if (extendsClauseElement && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
+            if (extendsClauseElement
+                && thisCaptureStatus !== SuperCaptureResult.ReplaceWithReturn
+                && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
                 statements.push(
                     createReturn(
                         createIdentifier("_this")
@@ -1190,45 +1221,61 @@ namespace ts {
          *
          * @returns The new statement offset into the `statements` array.
          */
-        function declareOrCaptureThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, firstNonPrologue: number) {
-            if (hasExtendsClause) {
-                // Most of the time, a 'super' call will be the first real statement in a constructor body.
-                // In these cases, we'd like to transform these into a *single* statement instead of a declaration
-                // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
-                // we'd get:
-                //
-                //      var _this;
-                //      _this = super();
-                //
-                // instead of
-                //
-                //      var _this = super();
-                //
-                let initializer: Expression = undefined;
-                let firstStatement: Statement;
-                if (firstNonPrologue < ctor.body.statements.length) {
-                    firstStatement = ctor.body.statements[firstNonPrologue];
-
-                    if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
-                        const superCall = (firstStatement as ExpressionStatement).expression as CallExpression;
-                        initializer = setOriginalNode(
-                            saveStateAndInvoke(superCall, visitImmediateSuperCallInBody),
-                            superCall
-                        );
-                    }
-                }
-                captureThisForNode(statements, ctor, /*initializer*/ initializer, firstStatement);
+        function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, statementOffset: number) {
+            // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
+            if (!hasExtendsClause) {
+                addCaptureThisForNodeIfNeeded(statements, ctor);
+                return SuperCaptureResult.NoReplacement;
+            }
 
-                // We're actually skipping an extra statement. Signal this to the caller.
-                if (initializer) {
-                    return firstNonPrologue + 1;
+            // Most of the time, a 'super' call will be the first real statement in a constructor body.
+            // In these cases, we'd like to transform these into a *single* statement instead of a declaration
+            // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
+            // we'd get:
+            //
+            //      var _this;
+            //      _this = _super.call(...) || this;
+            //
+            // instead of
+            //
+            //      var _this = _super.call(...) || this;
+            //
+            // Additionally, if the 'super()' call is the last statement, we should just avoid capturing
+            // entirely and immediately return the result like so:
+            //
+            //      return _super.call(...) || this;
+            //
+            let firstStatement: Statement;
+            let superCallExpression: Expression;
+
+            const ctorStatements = ctor.body.statements;
+            if (statementOffset < ctorStatements.length) {
+                firstStatement = ctorStatements[statementOffset];
+
+                if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
+                    const superCall = (firstStatement as ExpressionStatement).expression as CallExpression;
+                    superCallExpression = setOriginalNode(
+                        saveStateAndInvoke(superCall, visitImmediateSuperCallInBody),
+                        superCall
+                    );
                 }
             }
-            else {
-                addCaptureThisForNodeIfNeeded(statements, ctor);
+
+            // Return the result if we have an immediate super() call on the last statement.
+            if (superCallExpression && statementOffset === ctorStatements.length - 1) {
+                statements.push(createReturn(superCallExpression));
+                return SuperCaptureResult.ReplaceWithReturn;
+            }
+
+            // Perform the capture.
+            captureThisForNode(statements, ctor, superCallExpression, firstStatement);
+
+            // If we're actually replacing the original statement, we need to signal this to the caller.
+            if (superCallExpression) {
+                return SuperCaptureResult.ReplaceSuperCapture;
             }
 
-            return firstNonPrologue;
+            return SuperCaptureResult.NoReplacement;
         }
 
         /**

From cd787cc1c2effa78d5877dd7d642e03a9d2484c3 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 20 Sep 2016 12:29:32 -0400
Subject: [PATCH 30/39] Accepted baselines.

---
 .../reference/arrowFunctionContexts.js        |  6 ++--
 tests/baselines/reference/baseCheck.js        |  6 ++--
 .../reference/captureThisInSuperCall.js       |  3 +-
 .../reference/checkForObjectTooStrict.js      |  6 ++--
 .../checkSuperCallBeforeThisAccessing5.js     |  3 +-
 .../checkSuperCallBeforeThisAccessing7.js     |  3 +-
 .../reference/classSideInheritance2.js        |  3 +-
 .../reference/classSideInheritance3.js        |  3 +-
 tests/baselines/reference/classUpdateTests.js |  3 +-
 .../reference/collisionSuperAndParameter.js   |  3 +-
 ...perAndPropertyNameAsConstuctorParameter.js |  6 ++--
 .../reference/commentsInheritance.js          |  3 +-
 ...ctorFunctionTypeIsAssignableToBaseType2.js |  3 +-
 .../reference/constructorOverloads2.js        |  3 +-
 .../reference/declFileGenericType2.js         |  3 +-
 .../reference/decoratorOnClassConstructor2.js |  3 +-
 .../reference/decoratorOnClassConstructor3.js |  3 +-
 .../derivedClassOverridesPrivateFunction1.js  |  3 +-
 .../derivedClassOverridesProtectedMembers.js  |  3 +-
 .../derivedClassOverridesProtectedMembers2.js |  3 +-
 .../derivedClassOverridesProtectedMembers3.js | 30 +++++++------------
 .../derivedClassOverridesPublicMembers.js     |  3 +-
 .../derivedClassSuperCallsWithThisArg.js      |  3 +-
 .../destructuringParameterDeclaration5.js     |  6 ++--
 tests/baselines/reference/es6ClassTest2.js    |  3 +-
 ...cClassPropertyInheritanceSpecialization.js |  3 +-
 ...genericConstraintOnExtendedBuiltinTypes.js |  3 +-
 ...enericConstraintOnExtendedBuiltinTypes2.js |  3 +-
 .../reference/genericTypeConstraints.js       |  3 +-
 .../missingPropertiesOfClassExpression.js     |  3 +-
 .../reference/optionalParamArgsTest.js        |  3 +-
 .../baselines/reference/parserRealSource11.js | 21 +++++--------
 tests/baselines/reference/parserharness.js    |  3 +-
 .../reference/strictModeInConstructor.js      |  3 +-
 .../superCallBeforeThisAccessing2.js          |  3 +-
 .../superCallBeforeThisAccessing6.js          |  3 +-
 ...allFromClassThatDerivesFromGenericType1.js |  3 +-
 ...allFromClassThatDerivesFromGenericType2.js |  3 +-
 ...eButWithIncorrectNumberOfTypeArguments1.js |  3 +-
 ...sFromGenericTypeButWithNoTypeArguments1.js |  3 +-
 ...ivesNonGenericTypeButWithTypeArguments1.js |  3 +-
 .../superCallInsideClassDeclaration.js        |  3 +-
 .../superCallInsideClassExpression.js         |  3 +-
 .../superCallParameterContextualTyping1.js    |  3 +-
 .../superCallParameterContextualTyping2.js    |  3 +-
 .../superWithGenericSpecialization.js         |  3 +-
 .../baselines/reference/superWithGenerics.js  |  3 +-
 .../reference/targetTypeBaseCalls.js          |  3 +-
 .../reference/thisInInvalidContexts.js        |  3 +-
 .../thisInInvalidContextsExternalModule.js    |  3 +-
 tests/baselines/reference/thisInSuperCall.js  |  3 +-
 tests/baselines/reference/thisInSuperCall2.js |  3 +-
 tests/baselines/reference/unknownSymbols1.js  |  3 +-
 .../reference/validUseOfThisInSuper.js        |  3 +-
 54 files changed, 74 insertions(+), 148 deletions(-)

diff --git a/tests/baselines/reference/arrowFunctionContexts.js b/tests/baselines/reference/arrowFunctionContexts.js
index 1af0797b41fde..64727398f7259 100644
--- a/tests/baselines/reference/arrowFunctionContexts.js
+++ b/tests/baselines/reference/arrowFunctionContexts.js
@@ -116,8 +116,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, function () { return _this; }) || this;
-        return _this;
+        return _super.call(this, function () { return _this; }) || this;
     }
     return Derived;
 }(Base));
@@ -158,8 +157,7 @@ var M2;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.call(this, function () { return _this; }) || this;
-            return _this;
+            return _super.call(this, function () { return _this; }) || this;
         }
         return Derived;
     }(Base));
diff --git a/tests/baselines/reference/baseCheck.js b/tests/baselines/reference/baseCheck.js
index 623cd152b9a5d..870f811c09fa6 100644
--- a/tests/baselines/reference/baseCheck.js
+++ b/tests/baselines/reference/baseCheck.js
@@ -43,16 +43,14 @@ var C = (function () {
 var ELoc = (function (_super) {
     __extends(ELoc, _super);
     function ELoc(x) {
-        var _this = _super.call(this, 0, x) || this;
-        return _this;
+        return _super.call(this, 0, x) || this;
     }
     return ELoc;
 }(C));
 var ELocVar = (function (_super) {
     __extends(ELocVar, _super);
     function ELocVar(x) {
-        var _this = _super.call(this, 0, loc) || this;
-        return _this;
+        return _super.call(this, 0, loc) || this;
     }
     ELocVar.prototype.m = function () {
         var loc = 10;
diff --git a/tests/baselines/reference/captureThisInSuperCall.js b/tests/baselines/reference/captureThisInSuperCall.js
index 069871f598e88..2c4df5db96151 100644
--- a/tests/baselines/reference/captureThisInSuperCall.js
+++ b/tests/baselines/reference/captureThisInSuperCall.js
@@ -22,8 +22,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
-        return _this;
+        return _super.call(this, { test: function () { return _this.someMethod(); } }) || this;
     }
     B.prototype.someMethod = function () { };
     return B;
diff --git a/tests/baselines/reference/checkForObjectTooStrict.js b/tests/baselines/reference/checkForObjectTooStrict.js
index 156608bd6b5d7..ade99e9319b39 100644
--- a/tests/baselines/reference/checkForObjectTooStrict.js
+++ b/tests/baselines/reference/checkForObjectTooStrict.js
@@ -49,16 +49,14 @@ var Foo;
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Bar;
 }(Foo.Object));
 var Baz = (function (_super) {
     __extends(Baz, _super);
     function Baz() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Baz;
 }(Object));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
index 3174bebd11db4..8c7f18b77f617 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing5.js
@@ -25,8 +25,7 @@ var Based = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, _this.x) || this;
-        return _this;
+        return _super.call(this, this.x) || this;
     }
     return Derived;
 }(Based));
diff --git a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
index 364aed4d4b079..ca12c16e047ad 100644
--- a/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
+++ b/tests/baselines/reference/checkSuperCallBeforeThisAccessing7.js
@@ -23,8 +23,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = _super.call(this, (function () { return _this; })) || this;
-        return _this;
+        return _super.call(this, (function () { return _this; })) || this;
     }
     return Super;
 }(Base));
diff --git a/tests/baselines/reference/classSideInheritance2.js b/tests/baselines/reference/classSideInheritance2.js
index 475f9bd4ceb53..67ee666749b75 100644
--- a/tests/baselines/reference/classSideInheritance2.js
+++ b/tests/baselines/reference/classSideInheritance2.js
@@ -29,8 +29,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var SubText = (function (_super) {
     __extends(SubText, _super);
     function SubText(text, span) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubText;
 }(TextBase));
diff --git a/tests/baselines/reference/classSideInheritance3.js b/tests/baselines/reference/classSideInheritance3.js
index 361378c3ff518..589dd81c5c693 100644
--- a/tests/baselines/reference/classSideInheritance3.js
+++ b/tests/baselines/reference/classSideInheritance3.js
@@ -42,8 +42,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C(x) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classUpdateTests.js b/tests/baselines/reference/classUpdateTests.js
index 9809966c4c26f..53ef71d0e4be7 100644
--- a/tests/baselines/reference/classUpdateTests.js
+++ b/tests/baselines/reference/classUpdateTests.js
@@ -189,8 +189,7 @@ var H = (function () {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     } // ERROR - no super call allowed
     return I;
 }(Object));
diff --git a/tests/baselines/reference/collisionSuperAndParameter.js b/tests/baselines/reference/collisionSuperAndParameter.js
index 750ae15ef0aef..f5765043c5502 100644
--- a/tests/baselines/reference/collisionSuperAndParameter.js
+++ b/tests/baselines/reference/collisionSuperAndParameter.js
@@ -124,8 +124,7 @@ var Foo2 = (function (_super) {
 var Foo4 = (function (_super) {
     __extends(Foo4, _super);
     function Foo4(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     Foo4.prototype.y = function (_super) {
         var _this = this;
diff --git a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
index 269881b3b90ce..5fa7fe290914e 100644
--- a/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
+++ b/tests/baselines/reference/collisionSuperAndPropertyNameAsConstuctorParameter.js
@@ -44,8 +44,7 @@ var a = (function () {
 var b1 = (function (_super) {
     __extends(b1, _super);
     function b1(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return b1;
 }(a));
@@ -61,8 +60,7 @@ var b2 = (function (_super) {
 var b3 = (function (_super) {
     __extends(b3, _super);
     function b3(_super) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return b3;
 }(a));
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index 294f3a3369054..a8a8d5fa8899b 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -227,8 +227,7 @@ var c2 = (function () {
 var c3 = (function (_super) {
     __extends(c3, _super);
     function c3() {
-        var _this = _super.call(this, 10) || this;
-        return _this;
+        return _super.call(this, 10) || this;
     }
     /** c3 f1*/
     c3.prototype.f1 = function () {
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
index a60eb4de05662..c5e27748f5236 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType2.js
@@ -47,8 +47,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(x) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/constructorOverloads2.js b/tests/baselines/reference/constructorOverloads2.js
index c26d031656fa9..2d26194f2e764 100644
--- a/tests/baselines/reference/constructorOverloads2.js
+++ b/tests/baselines/reference/constructorOverloads2.js
@@ -40,8 +40,7 @@ var FooBase = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo(x, y) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Foo.prototype.bar1 = function () { };
     return Foo;
diff --git a/tests/baselines/reference/declFileGenericType2.js b/tests/baselines/reference/declFileGenericType2.js
index 328ab0cd9491b..a51254122ed06 100644
--- a/tests/baselines/reference/declFileGenericType2.js
+++ b/tests/baselines/reference/declFileGenericType2.js
@@ -58,8 +58,7 @@ var templa;
             var AbstractElementController = (function (_super) {
                 __extends(AbstractElementController, _super);
                 function AbstractElementController() {
-                    var _this = _super.call(this) || this;
-                    return _this;
+                    return _super.call(this) || this;
                 }
                 return AbstractElementController;
             }(templa.mvc.AbstractController));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor2.js b/tests/baselines/reference/decoratorOnClassConstructor2.js
index 44bde0a171d90..ce323e8ed1e71 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor2.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor2.js
@@ -45,8 +45,7 @@ var _0_ts_2 = require("./0.ts");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return C;
 }(_0_ts_1.base));
diff --git a/tests/baselines/reference/decoratorOnClassConstructor3.js b/tests/baselines/reference/decoratorOnClassConstructor3.js
index 5130986b1f78e..f06bf80b21ddd 100644
--- a/tests/baselines/reference/decoratorOnClassConstructor3.js
+++ b/tests/baselines/reference/decoratorOnClassConstructor3.js
@@ -48,8 +48,7 @@ var _0_2 = require("./0");
 var C = (function (_super) {
     __extends(C, _super);
     function C(prop) {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return C;
 }(_0_1.base));
diff --git a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
index a0b1559d43089..981c072d47c68 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivateFunction1.js
@@ -32,8 +32,7 @@ var BaseClass = (function () {
 var DerivedClass = (function (_super) {
     __extends(DerivedClass, _super);
     function DerivedClass() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     DerivedClass.prototype._init = function () {
     };
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
index e86806d31d203..b8997769eb74c 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers.js
@@ -66,8 +66,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index 3035b2cb56fcb..ac9b401a45c4b 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -94,8 +94,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
index 0e0c1c1ff01e7..d0d9d8fa0f58a 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers3.js
@@ -103,16 +103,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived2.prototype.b = function (a) { };
     return Derived2;
@@ -120,8 +118,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived3.prototype, "c", {
         get: function () { return x; },
@@ -133,8 +130,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived4.prototype, "c", {
         set: function (v) { },
@@ -146,24 +142,21 @@ var Derived4 = (function (_super) {
 var Derived5 = (function (_super) {
     __extends(Derived5, _super);
     function Derived5(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived5;
 }(Base));
 var Derived6 = (function (_super) {
     __extends(Derived6, _super);
     function Derived6(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived6;
 }(Base));
 var Derived7 = (function (_super) {
     __extends(Derived7, _super);
     function Derived7(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Derived7.s = function (a) { };
     return Derived7;
@@ -171,8 +164,7 @@ var Derived7 = (function (_super) {
 var Derived8 = (function (_super) {
     __extends(Derived8, _super);
     function Derived8(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived8, "t", {
         get: function () { return x; },
@@ -184,8 +176,7 @@ var Derived8 = (function (_super) {
 var Derived9 = (function (_super) {
     __extends(Derived9, _super);
     function Derived9(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     Object.defineProperty(Derived9, "t", {
         set: function (v) { },
@@ -197,8 +188,7 @@ var Derived9 = (function (_super) {
 var Derived10 = (function (_super) {
     __extends(Derived10, _super);
     function Derived10(a) {
-        var _this = _super.call(this, a) || this;
-        return _this;
+        return _super.call(this, a) || this;
     }
     return Derived10;
 }(Base));
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index 703f1d4a833ea..92fbc07e77405 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -92,8 +92,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived(a) {
-        var _this = _super.call(this, x) || this;
-        return _this;
+        return _super.call(this, x) || this;
     }
     Derived.prototype.b = function (a) { };
     Object.defineProperty(Derived.prototype, "c", {
diff --git a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
index 039e25919f8c9..504d414a6088c 100644
--- a/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
+++ b/tests/baselines/reference/derivedClassSuperCallsWithThisArg.js
@@ -42,8 +42,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/destructuringParameterDeclaration5.js b/tests/baselines/reference/destructuringParameterDeclaration5.js
index 8781671853fcb..7ba178823df6f 100644
--- a/tests/baselines/reference/destructuringParameterDeclaration5.js
+++ b/tests/baselines/reference/destructuringParameterDeclaration5.js
@@ -65,8 +65,7 @@ var Class = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubClass;
 }(Class));
@@ -78,8 +77,7 @@ var D = (function () {
 var SubD = (function (_super) {
     __extends(SubD, _super);
     function SubD() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return SubD;
 }(D));
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index 9217f89037731..b3787405ff74e 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -267,8 +267,7 @@ var SuperParent = (function () {
 var SuperChild = (function (_super) {
     __extends(SuperChild, _super);
     function SuperChild() {
-        var _this = _super.call(this, 1) || this;
-        return _this;
+        return _super.call(this, 1) || this;
     }
     SuperChild.prototype.b = function () {
         _super.prototype.b.call(this, 'str');
diff --git a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
index 86410aaf10e71..28eaf46496807 100644
--- a/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
+++ b/tests/baselines/reference/genericClassPropertyInheritanceSpecialization.js
@@ -109,8 +109,7 @@ var PortalFx;
                 var Validator = (function (_super) {
                     __extends(Validator, _super);
                     function Validator(message) {
-                        var _this = _super.call(this, message) || this;
-                        return _this;
+                        return _super.call(this, message) || this;
                     }
                     return Validator;
                 }(Portal.Controls.Validators.Validator));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
index 582937e7c0a1a..b0974c26edefc 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes.js
@@ -52,8 +52,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this = _super.call(this, from) || this;
-                return _this;
+                return _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
index 88173a4cbe361..a403c0de0b3a5 100644
--- a/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
+++ b/tests/baselines/reference/genericConstraintOnExtendedBuiltinTypes2.js
@@ -51,8 +51,7 @@ var EndGate;
         var NumberTween = (function (_super) {
             __extends(NumberTween, _super);
             function NumberTween(from) {
-                var _this = _super.call(this, from) || this;
-                return _this;
+                return _super.call(this, from) || this;
             }
             return NumberTween;
         }(Tweening.Tween));
diff --git a/tests/baselines/reference/genericTypeConstraints.js b/tests/baselines/reference/genericTypeConstraints.js
index b82e261a14f1d..67303166aa327 100644
--- a/tests/baselines/reference/genericTypeConstraints.js
+++ b/tests/baselines/reference/genericTypeConstraints.js
@@ -38,8 +38,7 @@ var Bar = (function () {
 var BarExtended = (function (_super) {
     __extends(BarExtended, _super);
     function BarExtended() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return BarExtended;
 }(Bar));
diff --git a/tests/baselines/reference/missingPropertiesOfClassExpression.js b/tests/baselines/reference/missingPropertiesOfClassExpression.js
index 34b60940aa976..c7b30882b145e 100644
--- a/tests/baselines/reference/missingPropertiesOfClassExpression.js
+++ b/tests/baselines/reference/missingPropertiesOfClassExpression.js
@@ -15,8 +15,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var George = (function (_super) {
     __extends(George, _super);
     function George() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return George;
 }((function () {
diff --git a/tests/baselines/reference/optionalParamArgsTest.js b/tests/baselines/reference/optionalParamArgsTest.js
index 374b0956509fc..1b603898aa698 100644
--- a/tests/baselines/reference/optionalParamArgsTest.js
+++ b/tests/baselines/reference/optionalParamArgsTest.js
@@ -162,8 +162,7 @@ var C2 = (function (_super) {
     __extends(C2, _super);
     function C2(v2) {
         if (v2 === void 0) { v2 = 6; }
-        var _this = _super.call(this, v2) || this;
-        return _this;
+        return _super.call(this, v2) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/parserRealSource11.js b/tests/baselines/reference/parserRealSource11.js
index fd2c017b637e4..eb05d13f4ed43 100644
--- a/tests/baselines/reference/parserRealSource11.js
+++ b/tests/baselines/reference/parserRealSource11.js
@@ -2667,8 +2667,7 @@ var TypeScript;
     var MissingIdentifier = (function (_super) {
         __extends(MissingIdentifier, _super);
         function MissingIdentifier() {
-            var _this = _super.call(this, "__missing") || this;
-            return _this;
+            return _super.call(this, "__missing") || this;
         }
         MissingIdentifier.prototype.isMissing = function () {
             return true;
@@ -2707,8 +2706,7 @@ var TypeScript;
     var Expression = (function (_super) {
         __extends(Expression, _super);
         function Expression(nodeType) {
-            var _this = _super.call(this, nodeType) || this;
-            return _this;
+            return _super.call(this, nodeType) || this;
         }
         Expression.prototype.isExpression = function () { return true; };
         Expression.prototype.isStatementOrExpression = function () { return true; };
@@ -3165,8 +3163,7 @@ var TypeScript;
     var ModuleElement = (function (_super) {
         __extends(ModuleElement, _super);
         function ModuleElement(nodeType) {
-            var _this = _super.call(this, nodeType) || this;
-            return _this;
+            return _super.call(this, nodeType) || this;
         }
         return ModuleElement;
     }(AST));
@@ -3259,8 +3256,7 @@ var TypeScript;
     var VarDecl = (function (_super) {
         __extends(VarDecl, _super);
         function VarDecl(id, nest) {
-            var _this = _super.call(this, id, NodeType.VarDecl, nest) || this;
-            return _this;
+            return _super.call(this, id, NodeType.VarDecl, nest) || this;
         }
         VarDecl.prototype.isAmbient = function () { return hasFlag(this.varFlags, VarFlags.Ambient); };
         VarDecl.prototype.isExported = function () { return hasFlag(this.varFlags, VarFlags.Exported); };
@@ -3597,8 +3593,7 @@ var TypeScript;
     var InterfaceDeclaration = (function (_super) {
         __extends(InterfaceDeclaration, _super);
         function InterfaceDeclaration(name, members, extendsList, implementsList) {
-            var _this = _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
-            return _this;
+            return _super.call(this, NodeType.InterfaceDeclaration, name, extendsList, implementsList, members) || this;
         }
         InterfaceDeclaration.prototype.typeCheck = function (typeFlow) {
             return typeFlow.typeCheckInterface(this);
@@ -3992,8 +3987,7 @@ var TypeScript;
     var EndCode = (function (_super) {
         __extends(EndCode, _super);
         function EndCode() {
-            var _this = _super.call(this, NodeType.EndCode) || this;
-            return _this;
+            return _super.call(this, NodeType.EndCode) || this;
         }
         return EndCode;
     }(AST));
@@ -4650,8 +4644,7 @@ var TypeScript;
     var DebuggerStatement = (function (_super) {
         __extends(DebuggerStatement, _super);
         function DebuggerStatement() {
-            var _this = _super.call(this, NodeType.Debugger) || this;
-            return _this;
+            return _super.call(this, NodeType.Debugger) || this;
         }
         DebuggerStatement.prototype.emit = function (emitter, tokenId, startLine) {
             emitter.emitParensAndCommentsInPlace(this, true);
diff --git a/tests/baselines/reference/parserharness.js b/tests/baselines/reference/parserharness.js
index 059ac2efd8ed6..14ce433817695 100644
--- a/tests/baselines/reference/parserharness.js
+++ b/tests/baselines/reference/parserharness.js
@@ -2471,8 +2471,7 @@ var Harness;
     var Run = (function (_super) {
         __extends(Run, _super);
         function Run() {
-            var _this = _super.call(this, 'Test Run', null) || this;
-            return _this;
+            return _super.call(this, 'Test Run', null) || this;
         }
         Run.prototype.run = function () {
             emitLog('start');
diff --git a/tests/baselines/reference/strictModeInConstructor.js b/tests/baselines/reference/strictModeInConstructor.js
index ecd6bacd20a7d..da45bda5c6efb 100644
--- a/tests/baselines/reference/strictModeInConstructor.js
+++ b/tests/baselines/reference/strictModeInConstructor.js
@@ -107,8 +107,7 @@ var Bs = (function (_super) {
     __extends(Bs, _super);
     function Bs() {
         "use strict"; // No error
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return Bs;
 }(A));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing2.js b/tests/baselines/reference/superCallBeforeThisAccessing2.js
index 91cc3d28dd6ec..7331718a9edcf 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing2.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing2.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this, function () { _this._t; }) || this;
-        return _this;
+        return _super.call(this, function () { _this._t; }) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallBeforeThisAccessing6.js b/tests/baselines/reference/superCallBeforeThisAccessing6.js
index 4eb8e5266c2c5..e4dfb3f714ad8 100644
--- a/tests/baselines/reference/superCallBeforeThisAccessing6.js
+++ b/tests/baselines/reference/superCallBeforeThisAccessing6.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, this) || this;
     }
     return D;
 }(Base));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
index 27f3db5145359..bc196299bf9c2 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType1.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
index a8d5e8008acd9..8a0ef085590dd 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericType2.js
@@ -19,8 +19,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
index b12a3eef6d43c..0529d5e3dc222 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithIncorrectNumberOfTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
index c78e6693f165d..fb08ec289028f 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesFromGenericTypeButWithNoTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
index 32d2065dd3f1c..50153391f62a5 100644
--- a/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
+++ b/tests/baselines/reference/superCallFromClassThatDerivesNonGenericTypeButWithTypeArguments1.js
@@ -25,8 +25,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.call(this, function (value) { return String(value); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallInsideClassDeclaration.js b/tests/baselines/reference/superCallInsideClassDeclaration.js
index b696b4a302f40..05e44119608aa 100644
--- a/tests/baselines/reference/superCallInsideClassDeclaration.js
+++ b/tests/baselines/reference/superCallInsideClassDeclaration.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(D, _super);
             function D() {
-                var _this = _super.call(this) || this;
-                return _this;
+                return _super.call(this) || this;
             }
             return D;
         }(C));
diff --git a/tests/baselines/reference/superCallInsideClassExpression.js b/tests/baselines/reference/superCallInsideClassExpression.js
index 829311f237c34..3d55fe11cff49 100644
--- a/tests/baselines/reference/superCallInsideClassExpression.js
+++ b/tests/baselines/reference/superCallInsideClassExpression.js
@@ -39,8 +39,7 @@ var B = (function (_super) {
         var D = (function (_super) {
             __extends(class_1, _super);
             function class_1() {
-                var _this = _super.call(this) || this;
-                return _this;
+                return _super.call(this) || this;
             }
             return class_1;
         }(C));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping1.js b/tests/baselines/reference/superCallParameterContextualTyping1.js
index 0fe27f493e811..d8491b4ee830a 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping1.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping1.js
@@ -28,8 +28,7 @@ var B = (function (_super) {
     __extends(B, _super);
     // Ensure 'value' is of type 'number (and not '{}') by using its 'toExponential()' method.
     function B() {
-        var _this = _super.call(this, function (value) { return String(value.toExponential()); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value.toExponential()); }) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/superCallParameterContextualTyping2.js b/tests/baselines/reference/superCallParameterContextualTyping2.js
index f970be44aff0c..9868a7db1240b 100644
--- a/tests/baselines/reference/superCallParameterContextualTyping2.js
+++ b/tests/baselines/reference/superCallParameterContextualTyping2.js
@@ -27,8 +27,7 @@ var C = (function (_super) {
     __extends(C, _super);
     // Ensure 'value' is not of type 'any' by invoking it with type arguments.
     function C() {
-        var _this = _super.call(this, function (value) { return String(value()); }) || this;
-        return _this;
+        return _super.call(this, function (value) { return String(value()); }) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/superWithGenericSpecialization.js b/tests/baselines/reference/superWithGenericSpecialization.js
index 96303dab4eda3..a0381d0b944d8 100644
--- a/tests/baselines/reference/superWithGenericSpecialization.js
+++ b/tests/baselines/reference/superWithGenericSpecialization.js
@@ -28,8 +28,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/superWithGenerics.js b/tests/baselines/reference/superWithGenerics.js
index 36b485548716b..803f229bd4bd4 100644
--- a/tests/baselines/reference/superWithGenerics.js
+++ b/tests/baselines/reference/superWithGenerics.js
@@ -20,8 +20,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.call(this) || this;
-        return _this;
+        return _super.call(this) || this;
     }
     return D;
 }(B));
diff --git a/tests/baselines/reference/targetTypeBaseCalls.js b/tests/baselines/reference/targetTypeBaseCalls.js
index 8581526c1b62f..cac93023a00e0 100644
--- a/tests/baselines/reference/targetTypeBaseCalls.js
+++ b/tests/baselines/reference/targetTypeBaseCalls.js
@@ -35,8 +35,7 @@ new Foo(function (s) { s = 5; }); // error, if types are applied correctly
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.call(this, function (s) { s = 5; }) || this;
-        return _this;
+        return _super.call(this, function (s) { s = 5; }) || this;
     }
     return Bar;
 }(Foo)); // error, if types are applied correctly
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 7872aa121edf9..7fcfaf9d3174d 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -70,8 +70,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index e656824ae668b..546863b52165a 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -71,8 +71,7 @@ var ClassWithNoInitializer = (function (_super) {
     __extends(ClassWithNoInitializer, _super);
     //'this' in optional super call
     function ClassWithNoInitializer() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return ClassWithNoInitializer;
 }(BaseErrClass));
diff --git a/tests/baselines/reference/thisInSuperCall.js b/tests/baselines/reference/thisInSuperCall.js
index 1c1f11ffbc88f..2a4d15973ab2b 100644
--- a/tests/baselines/reference/thisInSuperCall.js
+++ b/tests/baselines/reference/thisInSuperCall.js
@@ -36,8 +36,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/thisInSuperCall2.js b/tests/baselines/reference/thisInSuperCall2.js
index 6288082ed64f0..eabfa9d562c61 100644
--- a/tests/baselines/reference/thisInSuperCall2.js
+++ b/tests/baselines/reference/thisInSuperCall2.js
@@ -33,8 +33,7 @@ var Base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.call(this, _this) || this;
-        return _this;
+        return _super.call(this, _this) || this;
     }
     return Foo;
 }(Base));
diff --git a/tests/baselines/reference/unknownSymbols1.js b/tests/baselines/reference/unknownSymbols1.js
index 5e2bb509a2325..832868c4b8ff8 100644
--- a/tests/baselines/reference/unknownSymbols1.js
+++ b/tests/baselines/reference/unknownSymbols1.js
@@ -63,8 +63,7 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.call(this, asdf) || this;
-        return _this;
+        return _super.call(this, asdf) || this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/validUseOfThisInSuper.js b/tests/baselines/reference/validUseOfThisInSuper.js
index bbd564db3663b..483e905b48ab6 100644
--- a/tests/baselines/reference/validUseOfThisInSuper.js
+++ b/tests/baselines/reference/validUseOfThisInSuper.js
@@ -24,8 +24,7 @@ var Base = (function () {
 var Super = (function (_super) {
     __extends(Super, _super);
     function Super() {
-        var _this = _super.call(this, (function () { return _this; })()) || this;
-        return _this;
+        return _super.call(this, (function () { return _this; })()) || this;
     }
     return Super;
 }(Base));

From 6580262c950626b9e14f4a1de90a8c420d6c5069 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 20 Sep 2016 12:30:33 -0400
Subject: [PATCH 31/39] Initialize instead of letting the value be potentially
 undefined.

---
 src/compiler/transformers/es6.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 5748739cb236f..a69dcdfbe6a2c 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -838,7 +838,7 @@ namespace ts {
             startLexicalEnvironment();
 
             let statementOffset = -1;
-            let thisCaptureStatus: SuperCaptureResult | undefined;
+            let thisCaptureStatus = SuperCaptureResult.NoReplacement;
             if (hasSynthesizedSuper) {
                 // If a super call has already been synthesized,
                 // we're going to assume that we should just transform everything after that.

From 4a5830dd0c3e4d2d2e7cb350233d198ad7acd741 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 11:44:11 -0700
Subject: [PATCH 32/39] Remove usage of 'useCapturedThis'.

---
 src/compiler/transformers/es6.ts | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 995b04c74da4b..2f529a09f9baa 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -783,8 +783,6 @@ namespace ts {
         function addConstructor(statements: Statement[], node: ClassExpression | ClassDeclaration, extendsClauseElement: ExpressionWithTypeArguments): void {
             const constructor = getFirstConstructorWithBody(node);
             const hasSynthesizedSuper = hasSynthesizedDefaultSuperCall(constructor, extendsClauseElement !== undefined);
-            const savedUseCapturedThis = useCapturedThis;
-            useCapturedThis = true;
 
             const constructorFunction =
                 createFunctionDeclaration(
@@ -802,7 +800,6 @@ namespace ts {
             if (extendsClauseElement) {
                 setNodeEmitFlags(constructorFunction, NodeEmitFlags.CapturesThis);
             }
-            useCapturedThis = savedUseCapturedThis;
             statements.push(constructorFunction);
         }
 

From c668644e0b77e5843cdaed982a9d2d8340e1a5d8 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:09:26 -0700
Subject: [PATCH 33/39] Collapse 'super()' capture/returns into a single return
 statement for generated 'super()' calls.

---
 src/compiler/transformers/es6.ts | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 2f529a09f9baa..ed5659e8a3f56 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -837,7 +837,7 @@ namespace ts {
             startLexicalEnvironment();
 
             let statementOffset = -1;
-            let thisCaptureStatus = SuperCaptureResult.NoReplacement;
+            let superCaptureStatus = SuperCaptureResult.NoReplacement;
             if (hasSynthesizedSuper) {
                 // If a super call has already been synthesized,
                 // we're going to assume that we should just transform everything after that.
@@ -854,13 +854,17 @@ namespace ts {
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
                 Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
 
-                thisCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
-                if (thisCaptureStatus === SuperCaptureResult.ReplaceSuperCapture || thisCaptureStatus === SuperCaptureResult.ReplaceWithReturn) {
-                    statementOffset++;
-                }
+                superCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
             }
 
-            addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
+            if (superCaptureStatus === SuperCaptureResult.NoReplacement) {
+                superCaptureStatus = addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
+            }
+
+            // The last statement expression was replaced. Skip it.
+            if (superCaptureStatus === SuperCaptureResult.ReplaceSuperCapture || superCaptureStatus === SuperCaptureResult.ReplaceWithReturn) {
+                statementOffset++;
+            }
 
             if (constructor) {
                 const body = saveStateAndInvoke(constructor, makeTransformerForConstructorBodyAtOffset(statementOffset));
@@ -870,7 +874,7 @@ namespace ts {
             // Return `_this` unless we're sure enough that it would be pointless to add a return statement.
             // If there's a constructor that we can tell returns in enough places, then we *do not* want to add a return.
             if (extendsClauseElement
-                && thisCaptureStatus !== SuperCaptureResult.ReplaceWithReturn
+                && superCaptureStatus !== SuperCaptureResult.ReplaceWithReturn
                 && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
                 statements.push(
                     createReturn(
@@ -955,6 +959,16 @@ namespace ts {
                 );
                 const superReturnValueOrThis = createLogicalOr(superCall, actualThis);
 
+                if (!constructor) {
+                    // We must be here because the user didn't write a constructor
+                    // but we needed to call 'super()' anyway - but if that's the case,
+                    // we can just immediately return the result of a 'super()' call.
+                    statements.push(createReturn(superReturnValueOrThis));
+                    return SuperCaptureResult.ReplaceWithReturn;
+                }
+
+                // The constructor was generated for some reason.
+                // Create a captured '_this' variable.
                 statements.push(
                     createVariableStatement(
                         /*modifiers*/ undefined,
@@ -969,7 +983,11 @@ namespace ts {
                 );
 
                 enableSubstitutionsForCapturedThis();
+
+                return SuperCaptureResult.ReplaceSuperCapture;
             }
+
+            return SuperCaptureResult.NoReplacement;
         }
 
         /**

From 1fbdb862027ed63828adb1c71bfc08a604bc1201 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:43:55 -0700
Subject: [PATCH 34/39] Accepted baselines.

---
 ...sClassHeritageListMemberTypeAnnotations.js |   3 +-
 ...accessibleTypeInTypeParameterConstraint.js |   3 +-
 .../reference/abstractClassInLocalScope.js    |   3 +-
 .../abstractClassInLocalScopeIsAbstract.js    |   3 +-
 .../reference/abstractPropertyNegative.js     |   3 +-
 .../accessors_spec_section-4.5_inference.js   |   3 +-
 .../reference/aliasUsageInAccessorsOfClass.js |   3 +-
 .../baselines/reference/aliasUsageInArray.js  |   3 +-
 .../aliasUsageInFunctionExpression.js         |   3 +-
 .../reference/aliasUsageInGenericFunction.js  |   3 +-
 .../reference/aliasUsageInIndexerOfClass.js   |   3 +-
 .../reference/aliasUsageInObjectLiteral.js    |   3 +-
 .../reference/aliasUsageInOrExpression.js     |   3 +-
 ...aliasUsageInTypeArgumentOfExtendsClause.js |   3 +-
 .../reference/aliasUsageInVarAssignment.js    |   3 +-
 .../reference/ambiguousOverloadResolution.js  |   3 +-
 .../reference/apparentTypeSubtyping.js        |   6 +-
 .../reference/apparentTypeSupertype.js        |   3 +-
 .../reference/arrayAssignmentTest1.js         |   3 +-
 .../reference/arrayAssignmentTest2.js         |   3 +-
 .../reference/arrayBestCommonTypes.js         |   6 +-
 .../reference/arrayLiteralTypeInference.js    |   6 +-
 tests/baselines/reference/arrayLiterals.js    |   6 +-
 .../arrayLiteralsWithRecursiveGenerics.js     |   3 +-
 ...rayOfSubtypeIsAssignableToReadonlyArray.js |   6 +-
 .../assignmentCompatWithCallSignatures3.js    |   9 +-
 .../assignmentCompatWithCallSignatures4.js    |   9 +-
 .../assignmentCompatWithCallSignatures5.js    |   9 +-
 .../assignmentCompatWithCallSignatures6.js    |   9 +-
 ...ssignmentCompatWithConstructSignatures3.js |   9 +-
 ...ssignmentCompatWithConstructSignatures4.js |   9 +-
 ...ssignmentCompatWithConstructSignatures5.js |   9 +-
 ...ssignmentCompatWithConstructSignatures6.js |   9 +-
 .../assignmentCompatWithNumericIndexer.js     |   3 +-
 .../assignmentCompatWithNumericIndexer3.js    |   3 +-
 .../assignmentCompatWithObjectMembers4.js     |  12 +-
 ...nmentCompatWithObjectMembersOptionality.js |   6 +-
 ...mentCompatWithObjectMembersOptionality2.js |   6 +-
 .../assignmentCompatWithStringIndexer.js      |   6 +-
 .../reference/asyncImportedPromise_es5.js     |   3 +-
 .../reference/asyncMethodWithSuper_es5.js     |   3 +-
 .../reference/asyncQualifiedReturnType_es5.js |   3 +-
 .../reference/awaitClassExpression_es5.js     |   3 +-
 .../reference/baseIndexSignatureResolution.js |   3 +-
 .../reference/baseTypeOrderChecking.js        |   6 +-
 .../baseTypeWrappingInstantiationChain.js     |   6 +-
 .../bestCommonTypeOfConditionalExpressions.js |   6 +-
 ...bestCommonTypeOfConditionalExpressions2.js |   6 +-
 .../reference/bestCommonTypeOfTuple2.js       |   3 +-
 ...allSignatureAssignabilityInInheritance2.js |   9 +-
 ...allSignatureAssignabilityInInheritance3.js |   9 +-
 ...allSignatureAssignabilityInInheritance4.js |   9 +-
 ...allSignatureAssignabilityInInheritance5.js |   9 +-
 ...allSignatureAssignabilityInInheritance6.js |   9 +-
 tests/baselines/reference/castingTuple.js     |   6 +-
 .../baselines/reference/chainedAssignment3.js |   3 +-
 ...arameterConstrainedToOtherTypeParameter.js |   6 +-
 .../reference/circularImportAlias.js          |   3 +-
 .../circularTypeofWithFunctionModule.js       |   3 +-
 .../classAbstractConstructorAssignability.js  |   6 +-
 .../reference/classAbstractCrashedOnce.js     |   3 +-
 .../reference/classAbstractExtends.js         |  12 +-
 .../reference/classAbstractFactoryFunction.js |   3 +-
 .../reference/classAbstractGeneric.js         |  18 +--
 .../reference/classAbstractInAModule.js       |   3 +-
 .../reference/classAbstractInheritance.js     |  24 +--
 .../reference/classAbstractInstantiations1.js |   6 +-
 .../reference/classAbstractInstantiations2.js |  12 +-
 .../classAbstractOverrideWithAbstract.js      |  12 +-
 .../reference/classAbstractSuperCalls.js      |   9 +-
 .../classAbstractUsingAbstractMethod1.js      |   6 +-
 .../classAbstractUsingAbstractMethods2.js     |  21 +--
 .../classConstructorAccessibility4.js         |   6 +-
 .../classConstructorAccessibility5.js         |   3 +-
 ...clarationMergedInModuleWithContinuation.js |   3 +-
 .../classDoesNotDependOnBaseTypes.js          |   3 +-
 tests/baselines/reference/classExpression2.js |   3 +-
 .../classExpressionExtendingAbstractClass.js  |   3 +-
 .../reference/classExtendingBuiltinType.js    |  30 ++--
 .../reference/classExtendingClass.js          |   6 +-
 .../reference/classExtendingClassLikeType.js  |   9 +-
 .../reference/classExtendingNonConstructor.js |  21 +--
 .../baselines/reference/classExtendingNull.js |   6 +-
 .../reference/classExtendingPrimitive.js      |  27 ++--
 .../reference/classExtendingPrimitive2.js     |   3 +-
 .../reference/classExtendingQualifiedName.js  |   3 +-
 .../reference/classExtendingQualifiedName2.js |   3 +-
 .../reference/classExtendsAcrossFiles.js      |   6 +-
 ...sMergedWithModuleNotReferingConstructor.js |   3 +-
 ...tendsClauseClassNotReferringConstructor.js |   3 +-
 .../reference/classExtendsEveryObjectType.js  |  18 +--
 .../reference/classExtendsEveryObjectType2.js |   6 +-
 .../reference/classExtendsInterface.js        |   6 +-
 .../classExtendsInterfaceInExpression.js      |   3 +-
 .../classExtendsInterfaceInModule.js          |   9 +-
 .../baselines/reference/classExtendsItself.js |   9 +-
 .../reference/classExtendsItselfIndirectly.js |  18 +--
 .../classExtendsItselfIndirectly2.js          |  18 +--
 .../classExtendsItselfIndirectly3.js          |  18 +--
 .../classExtendsMultipleBaseClasses.js        |   3 +-
 ...classExtendsShadowedConstructorFunction.js |   3 +-
 .../classExtendsValidConstructorFunction.js   |   3 +-
 .../classHeritageWithTrailingSeparator.js     |   3 +-
 .../reference/classImplementsClass2.js        |   3 +-
 .../reference/classImplementsClass3.js        |   3 +-
 .../reference/classImplementsClass4.js        |   3 +-
 .../reference/classImplementsClass5.js        |   3 +-
 .../reference/classImplementsClass6.js        |   3 +-
 tests/baselines/reference/classIndexer3.js    |   3 +-
 tests/baselines/reference/classInheritence.js |   6 +-
 .../reference/classIsSubtypeOfBaseType.js     |   6 +-
 tests/baselines/reference/classOrder2.js      |   3 +-
 tests/baselines/reference/classOrderBug.js    |   3 +-
 .../reference/classSideInheritance1.js        |   3 +-
 .../classWithBaseClassButNoConstructor.js     |  12 +-
 .../reference/classWithConstructors.js        |   6 +-
 .../reference/classWithProtectedProperty.js   |   3 +-
 .../reference/classWithStaticMembers.js       |   3 +-
 tests/baselines/reference/classdecl.js        |   9 +-
 .../reference/clodulesDerivedClasses.js       |   3 +-
 ...llisionSuperAndLocalFunctionInAccessors.js |   6 +-
 .../collisionSuperAndLocalFunctionInMethod.js |   6 +-
 .../collisionSuperAndLocalVarInAccessors.js   |   6 +-
 .../collisionSuperAndLocalVarInMethod.js      |   6 +-
 .../collisionSuperAndNameResolution.js        |   3 +-
 .../reference/collisionSuperAndParameter1.js  |   3 +-
 ...xpressionAndLocalVarWithSuperExperssion.js |   6 +-
 .../reference/commentsInheritance.js          |   3 +-
 .../comparisonOperatorWithIdenticalObjects.js |   6 +-
 ...ithNoRelationshipObjectsOnCallSignature.js |   3 +-
 ...lationshipObjectsOnConstructorSignature.js |   3 +-
 ...thNoRelationshipObjectsOnIndexSignature.js |   3 +-
 ...nshipObjectsOnInstantiatedCallSignature.js |   3 +-
 ...jectsOnInstantiatedConstructorSignature.js |   3 +-
 ...peratorWithSubtypeObjectOnCallSignature.js |   3 +-
 ...WithSubtypeObjectOnConstructorSignature.js |   3 +-
 ...eratorWithSubtypeObjectOnIndexSignature.js |   3 +-
 ...ubtypeObjectOnInstantiatedCallSignature.js |   3 +-
 ...bjectOnInstantiatedConstructorSignature.js |   3 +-
 ...isonOperatorWithSubtypeObjectOnProperty.js |   6 +-
 .../reference/complexClassRelationships.js    |   3 +-
 ...catedGenericRecursiveBaseClassReference.js |   3 +-
 .../reference/computedPropertyNames24_ES5.js  |   3 +-
 .../reference/computedPropertyNames25_ES5.js  |   3 +-
 .../reference/computedPropertyNames26_ES5.js  |   3 +-
 .../reference/computedPropertyNames27_ES5.js  |   3 +-
 .../reference/computedPropertyNames31_ES5.js  |   3 +-
 .../reference/computedPropertyNames43_ES5.js  |   3 +-
 .../reference/computedPropertyNames44_ES5.js  |   3 +-
 .../reference/computedPropertyNames45_ES5.js  |   3 +-
 .../conditionalOperatorWithIdenticalBCT.js    |   6 +-
 .../conditionalOperatorWithoutIdenticalBCT.js |   6 +-
 .../reference/constantOverloadFunction.js     |   9 +-
 .../constantOverloadFunctionNoSubtypeError.js |   9 +-
 ...nstraintCheckInGenericBaseTypeReference.js |   3 +-
 ...uctSignatureAssignabilityInInheritance2.js |   9 +-
 ...uctSignatureAssignabilityInInheritance3.js |   9 +-
 ...uctSignatureAssignabilityInInheritance4.js |   9 +-
 ...uctSignatureAssignabilityInInheritance5.js |   9 +-
 ...uctSignatureAssignabilityInInheritance6.js |   9 +-
 ...uctorFunctionTypeIsAssignableToBaseType.js |   6 +-
 .../constructorHasPrototypeProperty.js        |   6 +-
 ...constructorWithIncompleteTypeAnnotation.js |   3 +-
 .../contextualTypingArrayOfLambdas.js         |   6 +-
 ...contextualTypingOfConditionalExpression.js |   6 +-
 ...ontextualTypingOfConditionalExpression2.js |   6 +-
 ...urcePropertyIsRelatableToTargetProperty.js |   3 +-
 .../reference/declFileClassExtendsNull.js     |   3 +-
 .../declFileForFunctionTypeAsTypeParameter.js |   3 +-
 ...ileGenericClassWithGenericExtendedClass.js |   3 +-
 .../reference/declFileGenericType.js          |   3 +-
 ...lictingWithClassReferredByExtendsClause.js |   6 +-
 ...dsClauseThatHasItsContainerNameConflict.js |   3 +-
 .../declarationEmitExpressionInExtends.js     |   3 +-
 .../declarationEmitExpressionInExtends2.js    |   3 +-
 .../declarationEmitExpressionInExtends3.js    |  12 +-
 .../declarationEmitExpressionInExtends4.js    |   9 +-
 .../declarationEmitNameConflicts3.js          |   3 +-
 .../declarationEmitProtectedMembers.js        |   6 +-
 .../declarationEmitThisPredicates01.js        |   3 +-
 ...tionEmitThisPredicatesWithPrivateName01.js |   3 +-
 .../reference/declareDottedExtend.js          |   6 +-
 .../reference/decoratorOnClassMethod12.js     |   3 +-
 ...ClassFunctionOverridesBaseClassAccessor.js |   3 +-
 .../derivedClassIncludesInheritedMembers.js   |   6 +-
 ...idesIndexersWithAssignmentCompatibility.js |   6 +-
 .../derivedClassOverridesPrivates.js          |   6 +-
 .../derivedClassOverridesProtectedMembers2.js |   3 +-
 .../derivedClassOverridesProtectedMembers4.js |   6 +-
 .../derivedClassOverridesPublicMembers.js     |   3 +-
 .../derivedClassOverridesWithoutSubtype.js    |   6 +-
 .../reference/derivedClassTransitivity.js     |   6 +-
 .../reference/derivedClassTransitivity2.js    |   6 +-
 .../reference/derivedClassTransitivity3.js    |   6 +-
 .../reference/derivedClassTransitivity4.js    |   6 +-
 .../reference/derivedClassWithAny.js          |   6 +-
 ...ivateInstanceShadowingProtectedInstance.js |   3 +-
 ...hPrivateInstanceShadowingPublicInstance.js |   3 +-
 ...thPrivateStaticShadowingProtectedStatic.js |   3 +-
 ...sWithPrivateStaticShadowingPublicStatic.js |   3 +-
 tests/baselines/reference/derivedClasses.js   |   6 +-
 .../reference/derivedGenericClassWithAny.js   |   6 +-
 ...sesHiddenBaseCallViaSuperPropertyAccess.js |   3 +-
 .../derivedTypeDoesNotRequireExtendsClause.js |   3 +-
 .../reference/emitThisInSuperMethodCall.js    |   3 +-
 tests/baselines/reference/emptyModuleName.js  |   3 +-
 ...rorForwardReferenceForwadingConstructor.js |   3 +-
 .../reference/errorSuperPropertyAccess.js     |   3 +-
 .../reference/errorsInGenericTypeReference.js |   3 +-
 tests/baselines/reference/es6ClassTest2.js    |   3 +-
 tests/baselines/reference/es6ClassTest7.js    |   3 +-
 .../exportAssignmentOfGenericType1.js         |   3 +-
 .../exportDeclarationInInternalModule.js      |   3 +-
 tests/baselines/reference/extBaseClass1.js    |   9 +-
 tests/baselines/reference/extBaseClass2.js    |   6 +-
 .../extendAndImplementTheSameBaseType.js      |   3 +-
 .../extendAndImplementTheSameBaseType2.js     |   3 +-
 .../extendBaseClassBeforeItsDeclared.js       |   3 +-
 .../extendClassExpressionFromModule.js        |   3 +-
 .../extendConstructSignatureInInterface.js    |   3 +-
 .../reference/extendNonClassSymbol1.js        |   3 +-
 .../reference/extendNonClassSymbol2.js        |   3 +-
 ...xtendingClassFromAliasAndUsageInIndexer.js |   6 +-
 .../reference/extendsClauseAlreadySeen.js     |   3 +-
 .../reference/extendsClauseAlreadySeen2.js    |   3 +-
 tests/baselines/reference/fluentClasses.js    |   6 +-
 tests/baselines/reference/for-inStatements.js |   3 +-
 .../reference/for-inStatementsInvalid.js      |   3 +-
 .../forStatementsMultipleInvalidDecl.js       |   3 +-
 .../reference/functionImplementationErrors.js |   6 +-
 .../reference/functionImplementations.js      |   6 +-
 .../reference/functionSubtypingOfVarArgs.js   |   3 +-
 .../reference/functionSubtypingOfVarArgs2.js  |   3 +-
 .../reference/generatedContextualTyping.js    |   6 +-
 .../genericBaseClassLiteralProperty.js        |   3 +-
 .../genericBaseClassLiteralProperty2.js       |   3 +-
 ...allWithConstraintsTypeArgumentInference.js |   6 +-
 .../genericCallWithObjectTypeArgs2.js         |   6 +-
 ...icCallWithObjectTypeArgsAndConstraints2.js |   3 +-
 ...icCallWithObjectTypeArgsAndConstraints3.js |   6 +-
 .../genericCallbacksAndClassHierarchy.js      |   3 +-
 .../genericClassExpressionInFunction.js       |  18 +--
 ...sInheritsConstructorFromNonGenericClass.js |   6 +-
 .../reference/genericClassStaticMethod.js     |   3 +-
 tests/baselines/reference/genericClasses3.js  |   3 +-
 .../genericDerivedTypeWithSpecializedBase.js  |   3 +-
 .../genericDerivedTypeWithSpecializedBase2.js |   3 +-
 .../genericInheritedDefaultConstructors.js    |   3 +-
 .../reference/genericPrototypeProperty2.js    |   6 +-
 .../reference/genericPrototypeProperty3.js    |   6 +-
 ...ericRecursiveImplicitConstructorErrors2.js |   3 +-
 .../reference/genericTypeAssertions2.js       |   3 +-
 .../reference/genericTypeAssertions4.js       |   6 +-
 .../reference/genericTypeAssertions6.js       |   3 +-
 ...genericTypeReferenceWithoutTypeArgument.js |   6 +-
 ...enericTypeReferenceWithoutTypeArgument2.js |   6 +-
 .../genericWithIndexerOfTypeParameterType2.js |   6 +-
 .../reference/heterogeneousArrayLiterals.js   |   6 +-
 .../reference/ifDoWhileStatements.js          |   3 +-
 .../implementClausePrecedingExtends.js        |   3 +-
 ...gAnInterfaceExtendingClassWithPrivates2.js |  33 ++--
 ...AnInterfaceExtendingClassWithProtecteds.js |  12 +-
 .../baselines/reference/importAsBaseClass.js  |   3 +-
 tests/baselines/reference/importHelpers.js    |   6 +-
 tests/baselines/reference/importHelpersAmd.js |   3 +-
 .../importHelpersInIsolatedModules.js         |   6 +-
 .../reference/importHelpersNoHelpers.js       |   6 +-
 .../reference/importHelpersNoModule.js        |   6 +-
 .../reference/importHelpersOutFile.js         |   6 +-
 .../reference/importHelpersSystem.js          |   3 +-
 .../reference/importShadowsGlobalName.js      |   3 +-
 .../reference/importUsedInExtendsList1.js     |   3 +-
 .../reference/indexerConstraints2.js          |  12 +-
 .../reference/indirectSelfReference.js        |   6 +-
 .../reference/indirectSelfReferenceGeneric.js |   6 +-
 .../infinitelyExpandingTypesNonGenericBase.js |   3 +-
 .../inheritFromGenericTypeParameter.js        |   3 +-
 ...SameNamePrivatePropertiesFromSameOrigin.js |   6 +-
 tests/baselines/reference/inheritance.js      |  12 +-
 tests/baselines/reference/inheritance1.js     |  12 +-
 ...itanceGrandParentPrivateMemberCollision.js |   6 +-
 ...tPrivateMemberCollisionWithPublicMember.js |   6 +-
 ...tPublicMemberCollisionWithPrivateMember.js |   6 +-
 ...ritanceMemberAccessorOverridingAccessor.js |   3 +-
 ...heritanceMemberAccessorOverridingMethod.js |   3 +-
 ...ritanceMemberAccessorOverridingProperty.js |   3 +-
 ...inheritanceMemberFuncOverridingAccessor.js |   3 +-
 .../inheritanceMemberFuncOverridingMethod.js  |   3 +-
 ...inheritanceMemberFuncOverridingProperty.js |   3 +-
 ...ritanceMemberPropertyOverridingAccessor.js |   3 +-
 ...heritanceMemberPropertyOverridingMethod.js |   3 +-
 ...ritanceMemberPropertyOverridingProperty.js |   3 +-
 .../inheritanceOfGenericConstructorMethod1.js |   3 +-
 .../inheritanceOfGenericConstructorMethod2.js |   6 +-
 ...ritanceStaticAccessorOverridingAccessor.js |   3 +-
 ...heritanceStaticAccessorOverridingMethod.js |   3 +-
 ...ritanceStaticAccessorOverridingProperty.js |   3 +-
 ...inheritanceStaticFuncOverridingAccessor.js |   3 +-
 ...eStaticFuncOverridingAccessorOfFuncType.js |   3 +-
 .../inheritanceStaticFuncOverridingMethod.js  |   3 +-
 ...inheritanceStaticFuncOverridingProperty.js |   3 +-
 ...eStaticFuncOverridingPropertyOfFuncType.js |   3 +-
 ...taticFunctionOverridingInstanceProperty.js |   3 +-
 .../inheritanceStaticMembersCompatible.js     |   3 +-
 .../inheritanceStaticMembersIncompatible.js   |   3 +-
 ...ritanceStaticPropertyOverridingAccessor.js |   3 +-
 ...heritanceStaticPropertyOverridingMethod.js |   3 +-
 ...ritanceStaticPropertyOverridingProperty.js |   3 +-
 .../inheritedConstructorWithRestParams.js     |   3 +-
 .../inheritedConstructorWithRestParams2.js    |   6 +-
 .../inheritedModuleMembersForClodule.js       |   6 +-
 .../reference/instanceOfAssignability.js      |   6 +-
 ...nstancePropertiesInheritedIntoClassType.js |   6 +-
 .../reference/instanceSubtypeCheck2.js        |   3 +-
 ...nstanceofWithStructurallyIdenticalTypes.js |   6 +-
 .../instantiatedReturnTypeContravariance.js   |   3 +-
 .../reference/interfaceClassMerging.js        |   3 +-
 .../reference/interfaceClassMerging2.js       |   3 +-
 .../reference/interfaceExtendsClass1.js       |   9 +-
 .../interfaceExtendsClassWithPrivate1.js      |   3 +-
 .../reference/interfaceImplementation8.js     |  12 +-
 .../invalidModuleWithStatementsOfEveryKind.js |  18 +--
 .../invalidMultipleVariableDeclarations.js    |   3 +-
 .../reference/invalidReturnStatements.js      |   3 +-
 .../isolatedModulesImportExportElision.js     |   3 +-
 tests/baselines/reference/jsxViaImport.js     |   3 +-
 tests/baselines/reference/lambdaArgCrash.js   |   3 +-
 tests/baselines/reference/localTypes1.js      |   6 +-
 tests/baselines/reference/m7Bugs.js           |   3 +-
 .../reference/mergedDeclarations5.js          |   3 +-
 .../reference/mergedDeclarations6.js          |   3 +-
 .../mergedInheritedClassInterface.js          |   6 +-
 .../mergedInterfacesWithInheritedPrivates2.js |   6 +-
 .../mergedInterfacesWithInheritedPrivates3.js |   3 +-
 tests/baselines/reference/moduleAsBaseType.js |   3 +-
 .../moduleImportedForTypeArgumentPosition.js  |   3 +-
 .../moduleWithStatementsOfEveryKind.js        |  12 +-
 .../reference/multipleInheritance.js          |  18 +--
 .../mutuallyRecursiveGenericBaseTypes2.js     |   3 +-
 tests/baselines/reference/noEmitHelpers.js    |   3 +-
 .../noImplicitAnyMissingGetAccessor.js        |   3 +-
 .../noImplicitAnyMissingSetAccessor.js        |   3 +-
 ...enericClassExtendingGenericClassWithAny.js |   3 +-
 ...cIndexerConstrainsPropertyDeclarations2.js |   3 +-
 .../reference/numericIndexerConstraint3.js    |   3 +-
 .../reference/numericIndexerConstraint4.js    |   3 +-
 .../reference/numericIndexerTyping2.js        |   3 +-
 ...objectTypeHidingMembersOfExtendedObject.js |   3 +-
 ...objectTypesIdentityWithNumericIndexers1.js |   6 +-
 ...objectTypesIdentityWithNumericIndexers2.js |   9 +-
 ...objectTypesIdentityWithNumericIndexers3.js |   6 +-
 .../objectTypesIdentityWithPrivates.js        |   6 +-
 .../objectTypesIdentityWithPrivates2.js       |   3 +-
 .../objectTypesIdentityWithPrivates3.js       |   6 +-
 .../objectTypesIdentityWithStringIndexers.js  |   6 +-
 .../objectTypesIdentityWithStringIndexers2.js |   9 +-
 .../optionalConstructorArgInSuper.js          |   3 +-
 .../reference/optionalParamInOverride.js      |   3 +-
 .../baselines/reference/outModuleConcatAmd.js |   3 +-
 .../reference/outModuleConcatAmd.js.map       |   2 +-
 .../outModuleConcatAmd.sourcemap.txt          |  40 ++---
 .../reference/outModuleConcatSystem.js        |   3 +-
 .../reference/outModuleConcatSystem.js.map    |   2 +-
 .../outModuleConcatSystem.sourcemap.txt       |  40 ++---
 .../reference/outModuleTripleSlashRefs.js     |   3 +-
 .../reference/outModuleTripleSlashRefs.js.map |   2 +-
 .../outModuleTripleSlashRefs.sourcemap.txt    |  40 ++---
 tests/baselines/reference/overload1.js        |   6 +-
 .../overloadOnConstConstraintChecks1.js       |   9 +-
 .../overloadOnConstConstraintChecks2.js       |   6 +-
 .../overloadOnConstConstraintChecks3.js       |   6 +-
 .../overloadOnConstConstraintChecks4.js       |   6 +-
 .../overloadOnConstantsInvalidOverload1.js    |   9 +-
 .../baselines/reference/overloadResolution.js |   9 +-
 .../overloadResolutionClassConstructors.js    |   9 +-
 .../overloadResolutionConstructors.js         |   9 +-
 .../reference/overloadingOnConstants1.js      |   9 +-
 .../reference/overloadingOnConstants2.js      |   3 +-
 .../overridingPrivateStaticMembers.js         |   3 +-
 .../reference/parseErrorInHeritageClause1.js  |   3 +-
 tests/baselines/reference/parser509630.js     |   3 +-
 tests/baselines/reference/parserAstSpans1.js  |   3 +-
 .../reference/parserClassDeclaration1.js      |   3 +-
 .../reference/parserClassDeclaration3.js      |   3 +-
 .../reference/parserClassDeclaration4.js      |   3 +-
 .../reference/parserClassDeclaration5.js      |   3 +-
 .../reference/parserClassDeclaration6.js      |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause2.js |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause4.js |   3 +-
 ...rrorRecovery_ExtendsOrImplementsClause5.js |   3 +-
 .../parserGenericsInTypeContexts1.js          |   3 +-
 .../parserGenericsInTypeContexts2.js          |   3 +-
 tests/baselines/reference/primitiveMembers.js |   3 +-
 tests/baselines/reference/privacyClass.js     |  72 +++------
 .../privacyClassExtendsClauseDeclFile.js      |  69 +++------
 tests/baselines/reference/privacyGloClass.js  |  30 ++--
 .../reference/privateAccessInSubclass1.js     |   3 +-
 ...tedMembersAreNotAccessibleDestructuring.js |   3 +-
 .../privateStaticNotAccessibleInClodule2.js   |   3 +-
 .../amd/testGlo.js                            |  12 +-
 .../node/testGlo.js                           |  12 +-
 .../reference/project/prologueEmit/amd/out.js |   3 +-
 .../project/prologueEmit/node/out.js          |   3 +-
 .../amd/m'ain.js                              |   3 +-
 .../node/m'ain.js                             |   3 +-
 .../reference/propertiesAndIndexers.js        |   3 +-
 tests/baselines/reference/propertyAccess.js   |   3 +-
 ...tyAccessOnTypeParameterWithConstraints2.js |   3 +-
 ...tyAccessOnTypeParameterWithConstraints3.js |   3 +-
 ...tyAccessOnTypeParameterWithConstraints5.js |   3 +-
 ...sPropertyAccessibleWithinNestedSubclass.js |   6 +-
 ...PropertyAccessibleWithinNestedSubclass1.js |  12 +-
 ...edClassPropertyAccessibleWithinSubclass.js |   3 +-
 ...dClassPropertyAccessibleWithinSubclass2.js |  12 +-
 ...dClassPropertyAccessibleWithinSubclass3.js |   3 +-
 .../protectedInstanceMemberAccessibility.js   |   6 +-
 tests/baselines/reference/protectedMembers.js |  21 +--
 ...icClassPropertyAccessibleWithinSubclass.js |   9 +-
 ...cClassPropertyAccessibleWithinSubclass2.js |   6 +-
 ...solution-does-not-affect-class-heritage.js |   3 +-
 .../reference/recursiveBaseCheck3.js          |   6 +-
 .../reference/recursiveBaseCheck4.js          |   3 +-
 .../reference/recursiveBaseCheck6.js          |   3 +-
 .../recursiveBaseConstructorCreation1.js      |   3 +-
 ...ssInstantiationsWithDefaultConstructors.js |   3 +-
 .../reference/recursiveClassReferenceTest.js  |   3 +-
 .../recursiveClassReferenceTest.js.map        |   2 +-
 .../recursiveClassReferenceTest.sourcemap.txt | 144 +++++++++---------
 .../reference/recursiveComplicatedClasses.js  |   9 +-
 ...sivelySpecializedConstructorDeclaration.js |   3 +-
 .../reference/reexportClassDefinition.js      |   3 +-
 ...lassDeclarationWhenInBaseTypeResolution.js | 141 ++++++-----------
 tests/baselines/reference/returnStatements.js |   3 +-
 ...peCheckExtendedClassInsidePublicMethod2.js |   3 +-
 ...peCheckExtendedClassInsideStaticMethod1.js |   3 +-
 .../reference/shadowPrivateMembers.js         |   3 +-
 .../specializedInheritedConstructors1.js      |   3 +-
 .../specializedOverloadWithRestParameters.js  |   3 +-
 tests/baselines/reference/staticFactory1.js   |   3 +-
 .../staticMemberAccessOffDerivedType1.js      |   3 +-
 .../reference/strictModeReservedWord.js       |   3 +-
 ...trictModeReservedWordInClassDeclaration.js |   6 +-
 ...gIndexerConstrainsPropertyDeclarations2.js |   3 +-
 .../reference/subtypesOfTypeParameter.js      |   3 +-
 .../subtypesOfTypeParameterWithConstraints.js |  87 ++++-------
 ...subtypesOfTypeParameterWithConstraints4.js |  27 ++--
 ...OfTypeParameterWithRecursiveConstraints.js |  54 +++----
 .../reference/subtypingTransitivity.js        |   6 +-
 .../reference/subtypingWithCallSignatures2.js |   9 +-
 .../reference/subtypingWithCallSignatures3.js |   9 +-
 .../reference/subtypingWithCallSignatures4.js |   9 +-
 .../subtypingWithConstructSignatures2.js      |   9 +-
 .../subtypingWithConstructSignatures3.js      |   9 +-
 .../subtypingWithConstructSignatures4.js      |   9 +-
 .../subtypingWithConstructSignatures5.js      |   9 +-
 .../subtypingWithConstructSignatures6.js      |   9 +-
 .../reference/subtypingWithNumericIndexer.js  |  18 +--
 .../reference/subtypingWithNumericIndexer3.js |  21 +--
 .../reference/subtypingWithNumericIndexer4.js |   9 +-
 .../reference/subtypingWithObjectMembers.js   |  24 +--
 .../reference/subtypingWithObjectMembers4.js  |  12 +-
 ...subtypingWithObjectMembersAccessibility.js |  12 +-
 ...ubtypingWithObjectMembersAccessibility2.js |  21 +--
 .../reference/subtypingWithStringIndexer.js   |  18 +--
 .../reference/subtypingWithStringIndexer3.js  |  21 +--
 .../reference/subtypingWithStringIndexer4.js  |   9 +-
 tests/baselines/reference/super.js            |   6 +-
 tests/baselines/reference/super1.js           |  15 +-
 tests/baselines/reference/super2.js           |  12 +-
 tests/baselines/reference/superAccess.js      |   3 +-
 .../reference/superAccessInFatArrow1.js       |   3 +-
 .../reference/superCallInStaticMethod.js      |   3 +-
 .../superCallWithMissingBaseClass.js          |   3 +-
 .../baselines/reference/superInCatchBlock1.js |   3 +-
 .../reference/superInObjectLiterals_ES5.js    |   3 +-
 .../reference/superPropertyAccess.js          |   3 +-
 ...essInComputedPropertiesOfNestedType_ES5.js |   3 +-
 .../reference/superPropertyAccess_ES5.js      |   3 +-
 .../reference/superSymbolIndexedAccess5.js    |   3 +-
 .../reference/superSymbolIndexedAccess6.js    |   3 +-
 ...side-object-literal-getters-and-setters.js |   3 +-
 tests/baselines/reference/switchStatements.js |   3 +-
 .../reference/systemModuleWithSuperClass.js   |   3 +-
 .../reference/thisInInvalidContexts.js        |   3 +-
 .../thisInInvalidContextsExternalModule.js    |   3 +-
 .../reference/thisTypeInFunctions.js          |   9 +-
 .../reference/thisTypeInFunctionsNegative.js  |   6 +-
 .../reference/tsxExternalModuleEmit1.js       |   6 +-
 .../tsxStatelessFunctionComponents2.js        |   3 +-
 .../reference/tsxUnionTypeComponent1.js       |   6 +-
 tests/baselines/reference/typeAssertions.js   |   3 +-
 .../baselines/reference/typeGuardFunction.js  |   3 +-
 .../reference/typeGuardFunctionErrors.js      |   3 +-
 .../reference/typeGuardFunctionGenerics.js    |   3 +-
 .../reference/typeGuardFunctionOfFormThis.js  |  18 +--
 .../typeGuardFunctionOfFormThisErrors.js      |   6 +-
 .../reference/typeGuardOfFormInstanceOf.js    |   3 +-
 .../reference/typeGuardOfFormIsType.js        |   3 +-
 .../reference/typeGuardOfFormThisMember.js    |   3 +-
 .../typeGuardOfFormThisMemberErrors.js        |   3 +-
 tests/baselines/reference/typeMatch2.js       |   3 +-
 .../reference/typeParameterAsBaseClass.js     |   3 +-
 .../reference/typeParameterAsBaseType.js      |   6 +-
 .../reference/typeParameterExtendingUnion1.js |   6 +-
 .../reference/typeParameterExtendingUnion2.js |   6 +-
 .../baselines/reference/typeValueConflict1.js |   3 +-
 .../baselines/reference/typeValueConflict2.js |   6 +-
 tests/baselines/reference/typeofClass2.js     |   3 +-
 .../typesWithSpecializedCallSignatures.js     |   6 +-
 ...typesWithSpecializedConstructSignatures.js |   6 +-
 tests/baselines/reference/undeclaredBase.js   |   3 +-
 .../undefinedIsSubtypeOfEverything.js         |  66 +++-----
 .../baselines/reference/underscoreMapFirst.js |   3 +-
 .../reference/unionTypeEquivalence.js         |   3 +-
 .../reference/unionTypeFromArrayLiteral.js    |   6 +-
 .../reference/unionTypesAssignability.js      |   6 +-
 .../reference/unspecializedConstraints.js     |   3 +-
 ...untypedFunctionCallsWithTypeParameters1.js |   3 +-
 .../reference/unusedClassesinNamespace4.js    |   3 +-
 .../unusedIdentifiersConsolidated1.js         |   3 +-
 520 files changed, 1217 insertions(+), 2346 deletions(-)

diff --git a/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js b/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
index de8e08843a2d6..ec0ed5494a4f1 100644
--- a/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
+++ b/tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js
@@ -38,8 +38,7 @@ var A;
     var Point3d = (function (_super) {
         __extends(Point3d, _super);
         function Point3d() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Point3d;
     }(Point));
diff --git a/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js b/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
index 58c7bd4c3c1f6..bae9593fb98b1 100644
--- a/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
+++ b/tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js
@@ -41,8 +41,7 @@ var A;
     var Point3d = (function (_super) {
         __extends(Point3d, _super);
         function Point3d() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Point3d;
     }(Point));
diff --git a/tests/baselines/reference/abstractClassInLocalScope.js b/tests/baselines/reference/abstractClassInLocalScope.js
index 04407cfc08c2e..db5144be39981 100644
--- a/tests/baselines/reference/abstractClassInLocalScope.js
+++ b/tests/baselines/reference/abstractClassInLocalScope.js
@@ -22,8 +22,7 @@ var __extends = (this && this.__extends) || function (d, b) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js b/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
index 09109c40675df..1b3e11cfa32d9 100644
--- a/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
+++ b/tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js
@@ -22,8 +22,7 @@ var __extends = (this && this.__extends) || function (d, b) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/abstractPropertyNegative.js b/tests/baselines/reference/abstractPropertyNegative.js
index 5a4c24fe2333f..bebf9026a0e56 100644
--- a/tests/baselines/reference/abstractPropertyNegative.js
+++ b/tests/baselines/reference/abstractPropertyNegative.js
@@ -92,8 +92,7 @@ var WrongTypeAccessor = (function () {
 var WrongTypeAccessorImpl = (function (_super) {
     __extends(WrongTypeAccessorImpl, _super);
     function WrongTypeAccessorImpl() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(WrongTypeAccessorImpl.prototype, "num", {
         get: function () { return "nope, wrong"; },
diff --git a/tests/baselines/reference/accessors_spec_section-4.5_inference.js b/tests/baselines/reference/accessors_spec_section-4.5_inference.js
index 860d74f5204fb..dbaeec1f688ef 100644
--- a/tests/baselines/reference/accessors_spec_section-4.5_inference.js
+++ b/tests/baselines/reference/accessors_spec_section-4.5_inference.js
@@ -38,8 +38,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/aliasUsageInAccessorsOfClass.js b/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
index d717da94d382c..8b60ed8e76ddd 100644
--- a/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
+++ b/tests/baselines/reference/aliasUsageInAccessorsOfClass.js
@@ -46,8 +46,7 @@ var Backbone = require("./aliasUsage1_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInArray.js b/tests/baselines/reference/aliasUsageInArray.js
index f08363776cc2e..bf573aa9abb20 100644
--- a/tests/baselines/reference/aliasUsageInArray.js
+++ b/tests/baselines/reference/aliasUsageInArray.js
@@ -40,8 +40,7 @@ var Backbone = require("./aliasUsageInArray_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInFunctionExpression.js b/tests/baselines/reference/aliasUsageInFunctionExpression.js
index 06e3e266ee956..49bdd493aacee 100644
--- a/tests/baselines/reference/aliasUsageInFunctionExpression.js
+++ b/tests/baselines/reference/aliasUsageInFunctionExpression.js
@@ -39,8 +39,7 @@ var Backbone = require("./aliasUsageInFunctionExpression_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInGenericFunction.js b/tests/baselines/reference/aliasUsageInGenericFunction.js
index 96121364837be..dc3a8a88bab8d 100644
--- a/tests/baselines/reference/aliasUsageInGenericFunction.js
+++ b/tests/baselines/reference/aliasUsageInGenericFunction.js
@@ -43,8 +43,7 @@ var Backbone = require("./aliasUsageInGenericFunction_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInIndexerOfClass.js b/tests/baselines/reference/aliasUsageInIndexerOfClass.js
index bbfe295259478..cb7ad3027cad4 100644
--- a/tests/baselines/reference/aliasUsageInIndexerOfClass.js
+++ b/tests/baselines/reference/aliasUsageInIndexerOfClass.js
@@ -45,8 +45,7 @@ var Backbone = require("./aliasUsageInIndexerOfClass_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInObjectLiteral.js b/tests/baselines/reference/aliasUsageInObjectLiteral.js
index 3b036f52a9d74..81e3e621e850b 100644
--- a/tests/baselines/reference/aliasUsageInObjectLiteral.js
+++ b/tests/baselines/reference/aliasUsageInObjectLiteral.js
@@ -40,8 +40,7 @@ var Backbone = require("./aliasUsageInObjectLiteral_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInOrExpression.js b/tests/baselines/reference/aliasUsageInOrExpression.js
index 4167294e5f23d..4faa41dd034f8 100644
--- a/tests/baselines/reference/aliasUsageInOrExpression.js
+++ b/tests/baselines/reference/aliasUsageInOrExpression.js
@@ -43,8 +43,7 @@ var Backbone = require("./aliasUsageInOrExpression_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
index 91c6ca2c53f79..2cf4aefab6c32 100644
--- a/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
+++ b/tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js
@@ -43,8 +43,7 @@ var Backbone = require("./aliasUsageInTypeArgumentOfExtendsClause_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/aliasUsageInVarAssignment.js b/tests/baselines/reference/aliasUsageInVarAssignment.js
index 0ba5cbbc8d080..80bb2dca20eea 100644
--- a/tests/baselines/reference/aliasUsageInVarAssignment.js
+++ b/tests/baselines/reference/aliasUsageInVarAssignment.js
@@ -39,8 +39,7 @@ var Backbone = require("./aliasUsageInVarAssignment_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/ambiguousOverloadResolution.js b/tests/baselines/reference/ambiguousOverloadResolution.js
index 27e6dd714baec..01002792921c2 100644
--- a/tests/baselines/reference/ambiguousOverloadResolution.js
+++ b/tests/baselines/reference/ambiguousOverloadResolution.js
@@ -22,8 +22,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/apparentTypeSubtyping.js b/tests/baselines/reference/apparentTypeSubtyping.js
index 914679c7de26a..6ca9d343a721f 100644
--- a/tests/baselines/reference/apparentTypeSubtyping.js
+++ b/tests/baselines/reference/apparentTypeSubtyping.js
@@ -38,8 +38,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -52,8 +51,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/apparentTypeSupertype.js b/tests/baselines/reference/apparentTypeSupertype.js
index 01fdb92a24ef5..c6d3378872e60 100644
--- a/tests/baselines/reference/apparentTypeSupertype.js
+++ b/tests/baselines/reference/apparentTypeSupertype.js
@@ -28,8 +28,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/arrayAssignmentTest1.js b/tests/baselines/reference/arrayAssignmentTest1.js
index 911df30a423d5..a887203cd5e05 100644
--- a/tests/baselines/reference/arrayAssignmentTest1.js
+++ b/tests/baselines/reference/arrayAssignmentTest1.js
@@ -101,8 +101,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C2.prototype.C2M1 = function () { return null; };
     return C2;
diff --git a/tests/baselines/reference/arrayAssignmentTest2.js b/tests/baselines/reference/arrayAssignmentTest2.js
index aff812247a27c..d82dedff29d60 100644
--- a/tests/baselines/reference/arrayAssignmentTest2.js
+++ b/tests/baselines/reference/arrayAssignmentTest2.js
@@ -75,8 +75,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C2.prototype.C2M1 = function () { return null; };
     return C2;
diff --git a/tests/baselines/reference/arrayBestCommonTypes.js b/tests/baselines/reference/arrayBestCommonTypes.js
index 7df398365421e..b7ddaa5d6dae4 100644
--- a/tests/baselines/reference/arrayBestCommonTypes.js
+++ b/tests/baselines/reference/arrayBestCommonTypes.js
@@ -128,8 +128,7 @@ var EmptyTypes;
     var derived = (function (_super) {
         __extends(derived, _super);
         function derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return derived;
     }(base));
@@ -188,8 +187,7 @@ var NonEmptyTypes;
     var derived = (function (_super) {
         __extends(derived, _super);
         function derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return derived;
     }(base));
diff --git a/tests/baselines/reference/arrayLiteralTypeInference.js b/tests/baselines/reference/arrayLiteralTypeInference.js
index 81155544cab8e..919d3a5e9227c 100644
--- a/tests/baselines/reference/arrayLiteralTypeInference.js
+++ b/tests/baselines/reference/arrayLiteralTypeInference.js
@@ -65,16 +65,14 @@ var Action = (function () {
 var ActionA = (function (_super) {
     __extends(ActionA, _super);
     function ActionA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ActionA;
 }(Action));
 var ActionB = (function (_super) {
     __extends(ActionB, _super);
     function ActionB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ActionB;
 }(Action));
diff --git a/tests/baselines/reference/arrayLiterals.js b/tests/baselines/reference/arrayLiterals.js
index 53066c7039179..530cdedec73f3 100644
--- a/tests/baselines/reference/arrayLiterals.js
+++ b/tests/baselines/reference/arrayLiterals.js
@@ -70,8 +70,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
@@ -79,8 +78,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js b/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
index 3c5f436505371..c0f320ac1e53a 100644
--- a/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
+++ b/tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js
@@ -39,8 +39,7 @@ var List = (function () {
 var DerivedList = (function (_super) {
     __extends(DerivedList, _super);
     function DerivedList() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return DerivedList;
 }(List));
diff --git a/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js b/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
index aba7a7cbc8cc1..d1d75e8041c2a 100644
--- a/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
+++ b/tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js
@@ -33,16 +33,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(Array));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures3.js b/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
index 80a9aa9cf148a..c5a1f41543760 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures3.js
@@ -114,24 +114,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures4.js b/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
index 5932aec049a67..58faf663ea893 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures4.js
@@ -115,24 +115,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures5.js b/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
index 7ea579d87edaf..87506cad08fd3 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures5.js
@@ -80,24 +80,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithCallSignatures6.js b/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
index 0fb5867836cf1..2c05d5960b291 100644
--- a/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
+++ b/tests/baselines/reference/assignmentCompatWithCallSignatures6.js
@@ -57,24 +57,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
index b933425ffb083..76ad53e4e05e0 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures3.js
@@ -114,24 +114,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
index e407c3acdb00b..f516df153c6b3 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures4.js
@@ -115,24 +115,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
index 59c816dcc5c2b..ef7de7f011bfb 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures5.js
@@ -80,24 +80,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js b/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
index b3b349ebc06fc..3d58ae707a514 100644
--- a/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
+++ b/tests/baselines/reference/assignmentCompatWithConstructSignatures6.js
@@ -57,24 +57,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithNumericIndexer.js b/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
index 6e14fb66ecdc0..3716050668362 100644
--- a/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
+++ b/tests/baselines/reference/assignmentCompatWithNumericIndexer.js
@@ -72,8 +72,7 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js b/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
index 3b32f327b073d..2e6ecd72741db 100644
--- a/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
+++ b/tests/baselines/reference/assignmentCompatWithNumericIndexer3.js
@@ -59,8 +59,7 @@ b = a; // ok
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembers4.js b/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
index ce80efc3c7a74..2cc2510c8da7b 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembers4.js
@@ -108,16 +108,14 @@ var OnlyDerived;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Base));
@@ -169,16 +167,14 @@ var WithBase;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Base));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
index d95eb43f0e570..3b12701b3d996 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js
@@ -103,16 +103,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
index f4c401979cf8c..f965d18e2cee2 100644
--- a/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
+++ b/tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js
@@ -105,16 +105,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/assignmentCompatWithStringIndexer.js b/tests/baselines/reference/assignmentCompatWithStringIndexer.js
index 54839da4b5a75..8d081c907940e 100644
--- a/tests/baselines/reference/assignmentCompatWithStringIndexer.js
+++ b/tests/baselines/reference/assignmentCompatWithStringIndexer.js
@@ -82,8 +82,7 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
@@ -94,8 +93,7 @@ var Generics;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A));
diff --git a/tests/baselines/reference/asyncImportedPromise_es5.js b/tests/baselines/reference/asyncImportedPromise_es5.js
index 396f380db3ee1..76ffbc833aa6f 100644
--- a/tests/baselines/reference/asyncImportedPromise_es5.js
+++ b/tests/baselines/reference/asyncImportedPromise_es5.js
@@ -19,8 +19,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Task = (function (_super) {
     __extends(Task, _super);
     function Task() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Task;
 }(Promise));
diff --git a/tests/baselines/reference/asyncMethodWithSuper_es5.js b/tests/baselines/reference/asyncMethodWithSuper_es5.js
index 1bada582b03d9..9ceff6bab4e4a 100644
--- a/tests/baselines/reference/asyncMethodWithSuper_es5.js
+++ b/tests/baselines/reference/asyncMethodWithSuper_es5.js
@@ -61,8 +61,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     // async method with only call/get on 'super' does not require a binding
     B.prototype.simple = function () {
diff --git a/tests/baselines/reference/asyncQualifiedReturnType_es5.js b/tests/baselines/reference/asyncQualifiedReturnType_es5.js
index 0081a30d93005..dd54f6ee8336d 100644
--- a/tests/baselines/reference/asyncQualifiedReturnType_es5.js
+++ b/tests/baselines/reference/asyncQualifiedReturnType_es5.js
@@ -13,8 +13,7 @@ var X;
     var MyPromise = (function (_super) {
         __extends(MyPromise, _super);
         function MyPromise() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return MyPromise;
     }(Promise));
diff --git a/tests/baselines/reference/awaitClassExpression_es5.js b/tests/baselines/reference/awaitClassExpression_es5.js
index f81b580092901..b207ba08f8d6a 100644
--- a/tests/baselines/reference/awaitClassExpression_es5.js
+++ b/tests/baselines/reference/awaitClassExpression_es5.js
@@ -17,8 +17,7 @@ function func() {
                     _a = function (_super) {
                         __extends(D, _super);
                         function D() {
-                            var _this = _super.apply(this, arguments) || this;
-                            return _this;
+                            return _super.apply(this, arguments) || this;
                         }
                         return D;
                     };
diff --git a/tests/baselines/reference/baseIndexSignatureResolution.js b/tests/baselines/reference/baseIndexSignatureResolution.js
index 6629ef35dda61..7e922cf83b239 100644
--- a/tests/baselines/reference/baseIndexSignatureResolution.js
+++ b/tests/baselines/reference/baseIndexSignatureResolution.js
@@ -38,8 +38,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/baseTypeOrderChecking.js b/tests/baselines/reference/baseTypeOrderChecking.js
index 187a354553df8..ec96b80a9999f 100644
--- a/tests/baselines/reference/baseTypeOrderChecking.js
+++ b/tests/baselines/reference/baseTypeOrderChecking.js
@@ -51,8 +51,7 @@ var Class1 = (function () {
 var Class2 = (function (_super) {
     __extends(Class2, _super);
     function Class2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Class2;
 }(Class1));
@@ -64,8 +63,7 @@ var Class3 = (function () {
 var Class4 = (function (_super) {
     __extends(Class4, _super);
     function Class4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Class4;
 }(Class3));
diff --git a/tests/baselines/reference/baseTypeWrappingInstantiationChain.js b/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
index bbf57046a975c..5f8dcbd0e10fd 100644
--- a/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
+++ b/tests/baselines/reference/baseTypeWrappingInstantiationChain.js
@@ -41,8 +41,7 @@ var CBaseBase = (function () {
 var CBase = (function (_super) {
     __extends(CBase, _super);
     function CBase() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return CBase;
 }(CBaseBase));
@@ -60,8 +59,7 @@ var Wrapper = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.works = function () {
         new CBaseBase(this);
diff --git a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
index a9e38f0520c8f..6d0f19dd37def 100644
--- a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
+++ b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js
@@ -44,16 +44,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
index 9af685812c298..2e2d0bcb1e2a4 100644
--- a/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
+++ b/tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js
@@ -40,16 +40,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/bestCommonTypeOfTuple2.js b/tests/baselines/reference/bestCommonTypeOfTuple2.js
index d71b6f17abfd2..928909f4c3852 100644
--- a/tests/baselines/reference/bestCommonTypeOfTuple2.js
+++ b/tests/baselines/reference/bestCommonTypeOfTuple2.js
@@ -46,8 +46,7 @@ var E = (function () {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return F;
 }(C));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
index 4fd0dc2cefc27..0ae7648c7f903 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance2.js
@@ -84,24 +84,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
index 710725f145be3..7a7791280ad87 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance3.js
@@ -131,24 +131,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
index 154aee0693b06..19d66ce8d461d 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance4.js
@@ -64,24 +64,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
index 7359d330cd6fb..1c53de5d26e7e 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance5.js
@@ -64,24 +64,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js b/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
index 594d2dcafb774..c42e36389ca59 100644
--- a/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
+++ b/tests/baselines/reference/callSignatureAssignabilityInInheritance6.js
@@ -67,24 +67,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/castingTuple.js b/tests/baselines/reference/castingTuple.js
index 426889df7de6b..f0178dcbbf0b2 100644
--- a/tests/baselines/reference/castingTuple.js
+++ b/tests/baselines/reference/castingTuple.js
@@ -59,8 +59,7 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(A));
@@ -68,8 +67,7 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return F;
 }(A));
diff --git a/tests/baselines/reference/chainedAssignment3.js b/tests/baselines/reference/chainedAssignment3.js
index 71b345a311ca2..3857867043c90 100644
--- a/tests/baselines/reference/chainedAssignment3.js
+++ b/tests/baselines/reference/chainedAssignment3.js
@@ -36,8 +36,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js b/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
index 7c428751b2844..26d341e1f6a7e 100644
--- a/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
+++ b/tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js
@@ -42,16 +42,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/circularImportAlias.js b/tests/baselines/reference/circularImportAlias.js
index 9d0e7648dcb82..6fe5e604e57d3 100644
--- a/tests/baselines/reference/circularImportAlias.js
+++ b/tests/baselines/reference/circularImportAlias.js
@@ -32,8 +32,7 @@ var B;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(B.a.C));
diff --git a/tests/baselines/reference/circularTypeofWithFunctionModule.js b/tests/baselines/reference/circularTypeofWithFunctionModule.js
index 811e86b21cafc..78e9d3f34e7f4 100644
--- a/tests/baselines/reference/circularTypeofWithFunctionModule.js
+++ b/tests/baselines/reference/circularTypeofWithFunctionModule.js
@@ -32,8 +32,7 @@ var maker;
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar;
     }(Foo));
diff --git a/tests/baselines/reference/classAbstractConstructorAssignability.js b/tests/baselines/reference/classAbstractConstructorAssignability.js
index 8738b43bb3fb3..35d9e75884fe0 100644
--- a/tests/baselines/reference/classAbstractConstructorAssignability.js
+++ b/tests/baselines/reference/classAbstractConstructorAssignability.js
@@ -28,16 +28,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/classAbstractCrashedOnce.js b/tests/baselines/reference/classAbstractCrashedOnce.js
index 02d31377de87f..fe23e60c94faa 100644
--- a/tests/baselines/reference/classAbstractCrashedOnce.js
+++ b/tests/baselines/reference/classAbstractCrashedOnce.js
@@ -24,8 +24,7 @@ var foo = (function () {
 var bar = (function (_super) {
     __extends(bar, _super);
     function bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     bar.prototype.test = function () {
         this.
diff --git a/tests/baselines/reference/classAbstractExtends.js b/tests/baselines/reference/classAbstractExtends.js
index 8ac2cc9de3de7..e899cb82d6d73 100644
--- a/tests/baselines/reference/classAbstractExtends.js
+++ b/tests/baselines/reference/classAbstractExtends.js
@@ -31,32 +31,28 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(B));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.bar = function () { };
     return E;
diff --git a/tests/baselines/reference/classAbstractFactoryFunction.js b/tests/baselines/reference/classAbstractFactoryFunction.js
index 4f612e3d9c692..50e232a9fcac7 100644
--- a/tests/baselines/reference/classAbstractFactoryFunction.js
+++ b/tests/baselines/reference/classAbstractFactoryFunction.js
@@ -31,8 +31,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/classAbstractGeneric.js b/tests/baselines/reference/classAbstractGeneric.js
index b76117fddfc01..96df8f5f19edd 100644
--- a/tests/baselines/reference/classAbstractGeneric.js
+++ b/tests/baselines/reference/classAbstractGeneric.js
@@ -39,32 +39,28 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A)); // error -- inherits abstract methods
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(A)); // error -- inherits abstract methods
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function () { return this.t; };
     return E;
@@ -72,8 +68,7 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     F.prototype.bar = function (t) { };
     return F;
@@ -81,8 +76,7 @@ var F = (function (_super) {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     G.prototype.foo = function () { return this.t; };
     G.prototype.bar = function (t) { };
diff --git a/tests/baselines/reference/classAbstractInAModule.js b/tests/baselines/reference/classAbstractInAModule.js
index aa66ba540a80b..c6a9e206bcc72 100644
--- a/tests/baselines/reference/classAbstractInAModule.js
+++ b/tests/baselines/reference/classAbstractInAModule.js
@@ -24,8 +24,7 @@ var M;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classAbstractInheritance.js b/tests/baselines/reference/classAbstractInheritance.js
index 0bd5dab31a997..297a80dd99c3d 100644
--- a/tests/baselines/reference/classAbstractInheritance.js
+++ b/tests/baselines/reference/classAbstractInheritance.js
@@ -35,16 +35,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
@@ -56,48 +54,42 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return BB;
 }(AA));
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return CC;
 }(AA));
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return DD;
 }(BB));
 var EE = (function (_super) {
     __extends(EE, _super);
     function EE() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return EE;
 }(BB));
 var FF = (function (_super) {
     __extends(FF, _super);
     function FF() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return FF;
 }(CC));
 var GG = (function (_super) {
     __extends(GG, _super);
     function GG() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return GG;
 }(CC));
diff --git a/tests/baselines/reference/classAbstractInstantiations1.js b/tests/baselines/reference/classAbstractInstantiations1.js
index aef8f58fab256..5abbb9c1baa6f 100644
--- a/tests/baselines/reference/classAbstractInstantiations1.js
+++ b/tests/baselines/reference/classAbstractInstantiations1.js
@@ -41,16 +41,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/classAbstractInstantiations2.js b/tests/baselines/reference/classAbstractInstantiations2.js
index 2e6cd648dc08a..dea4c744ae0a4 100644
--- a/tests/baselines/reference/classAbstractInstantiations2.js
+++ b/tests/baselines/reference/classAbstractInstantiations2.js
@@ -82,24 +82,21 @@ new x; // okay -- undefined behavior at runtime
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B)); // error -- not declared abstract
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(B)); // okay
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.bar = function () { return 1; };
     return E;
@@ -107,8 +104,7 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     F.prototype.bar = function () { return 2; };
     return F;
diff --git a/tests/baselines/reference/classAbstractOverrideWithAbstract.js b/tests/baselines/reference/classAbstractOverrideWithAbstract.js
index 5cb07934658d1..4ecebdf7b32f0 100644
--- a/tests/baselines/reference/classAbstractOverrideWithAbstract.js
+++ b/tests/baselines/reference/classAbstractOverrideWithAbstract.js
@@ -38,8 +38,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -52,8 +51,7 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     BB.prototype.bar = function () { };
     return BB;
@@ -61,16 +59,14 @@ var BB = (function (_super) {
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return CC;
 }(BB)); // error
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     DD.prototype.foo = function () { };
     return DD;
diff --git a/tests/baselines/reference/classAbstractSuperCalls.js b/tests/baselines/reference/classAbstractSuperCalls.js
index 44b15710c732e..0197f48a429d2 100644
--- a/tests/baselines/reference/classAbstractSuperCalls.js
+++ b/tests/baselines/reference/classAbstractSuperCalls.js
@@ -42,8 +42,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () { _super.prototype.foo.call(this); };
     B.prototype.baz = function () { return this.foo; };
@@ -52,8 +51,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () { return 2; };
     C.prototype.qux = function () { return _super.prototype.foo.call(this) || _super.prototype.foo; }; // 2 errors, foo is abstract
@@ -70,8 +68,7 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return BB;
 }(AA));
diff --git a/tests/baselines/reference/classAbstractUsingAbstractMethod1.js b/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
index ae6b08e4bcac5..74b5d62aaf532 100644
--- a/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
+++ b/tests/baselines/reference/classAbstractUsingAbstractMethod1.js
@@ -31,8 +31,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.foo = function () { return 1; };
     return B;
@@ -40,8 +39,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classAbstractUsingAbstractMethods2.js b/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
index 9f43ee1a6b3cb..25cf1a307c7a3 100644
--- a/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
+++ b/tests/baselines/reference/classAbstractUsingAbstractMethods2.js
@@ -41,24 +41,21 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function () { };
     return D;
@@ -66,8 +63,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function () { };
     return E;
@@ -80,24 +76,21 @@ var AA = (function () {
 var BB = (function (_super) {
     __extends(BB, _super);
     function BB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return BB;
 }(AA));
 var CC = (function (_super) {
     __extends(CC, _super);
     function CC() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return CC;
 }(AA));
 var DD = (function (_super) {
     __extends(DD, _super);
     function DD() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     DD.prototype.foo = function () { };
     return DD;
diff --git a/tests/baselines/reference/classConstructorAccessibility4.js b/tests/baselines/reference/classConstructorAccessibility4.js
index dfbc70de115b0..4772ac68d119f 100644
--- a/tests/baselines/reference/classConstructorAccessibility4.js
+++ b/tests/baselines/reference/classConstructorAccessibility4.js
@@ -51,8 +51,7 @@ var A = (function () {
         var C = (function (_super) {
             __extends(C, _super);
             function C() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return C;
         }(A));
@@ -74,8 +73,7 @@ var D = (function () {
         var F = (function (_super) {
             __extends(F, _super);
             function F() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return F;
         }(D));
diff --git a/tests/baselines/reference/classConstructorAccessibility5.js b/tests/baselines/reference/classConstructorAccessibility5.js
index b73ecb4a92b39..d658349c2a59c 100644
--- a/tests/baselines/reference/classConstructorAccessibility5.js
+++ b/tests/baselines/reference/classConstructorAccessibility5.js
@@ -25,8 +25,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.make = function () { new Base(); }; // ok
     return Derived;
diff --git a/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js b/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
index 83152355a137b..c1ecad3a7925d 100644
--- a/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
+++ b/tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js
@@ -35,8 +35,7 @@ var M;
     var O = (function (_super) {
         __extends(O, _super);
         function O() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return O;
     }(M.N));
diff --git a/tests/baselines/reference/classDoesNotDependOnBaseTypes.js b/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
index ef584afd6e9e4..076412e164dba 100644
--- a/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
+++ b/tests/baselines/reference/classDoesNotDependOnBaseTypes.js
@@ -31,8 +31,7 @@ var StringTreeCollectionBase = (function () {
 var StringTreeCollection = (function (_super) {
     __extends(StringTreeCollection, _super);
     function StringTreeCollection() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return StringTreeCollection;
 }(StringTreeCollectionBase));
diff --git a/tests/baselines/reference/classExpression2.js b/tests/baselines/reference/classExpression2.js
index f7405cfd38ac3..59b62c60cfe29 100644
--- a/tests/baselines/reference/classExpression2.js
+++ b/tests/baselines/reference/classExpression2.js
@@ -16,8 +16,7 @@ var D = (function () {
 var v = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(D));
diff --git a/tests/baselines/reference/classExpressionExtendingAbstractClass.js b/tests/baselines/reference/classExpressionExtendingAbstractClass.js
index 8673e48d65f8f..7312ab6567dcb 100644
--- a/tests/baselines/reference/classExpressionExtendingAbstractClass.js
+++ b/tests/baselines/reference/classExpressionExtendingAbstractClass.js
@@ -22,8 +22,7 @@ var A = (function () {
 var C = (function (_super) {
     __extends(class_1, _super);
     function class_1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return class_1;
 }(A));
diff --git a/tests/baselines/reference/classExtendingBuiltinType.js b/tests/baselines/reference/classExtendingBuiltinType.js
index 2a01c1aa8b3d2..4c95e3008eaf9 100644
--- a/tests/baselines/reference/classExtendingBuiltinType.js
+++ b/tests/baselines/reference/classExtendingBuiltinType.js
@@ -20,80 +20,70 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C1;
 }(Object));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(Function));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C3;
 }(String));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(Boolean));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5;
 }(Number));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }(Date));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C7;
 }(RegExp));
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C8;
 }(Error));
 var C9 = (function (_super) {
     __extends(C9, _super);
     function C9() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C9;
 }(Array));
 var C10 = (function (_super) {
     __extends(C10, _super);
     function C10() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C10;
 }(Array));
diff --git a/tests/baselines/reference/classExtendingClass.js b/tests/baselines/reference/classExtendingClass.js
index 4218bfbea98f4..91e3752980cd9 100644
--- a/tests/baselines/reference/classExtendingClass.js
+++ b/tests/baselines/reference/classExtendingClass.js
@@ -47,8 +47,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -67,8 +66,7 @@ var C2 = (function () {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(C2));
diff --git a/tests/baselines/reference/classExtendingClassLikeType.js b/tests/baselines/reference/classExtendingClassLikeType.js
index fdda53a381f1b..bfc10c2356394 100644
--- a/tests/baselines/reference/classExtendingClassLikeType.js
+++ b/tests/baselines/reference/classExtendingClassLikeType.js
@@ -68,8 +68,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D0 = (function (_super) {
     __extends(D0, _super);
     function D0() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D0;
 }(Base));
@@ -108,8 +107,7 @@ var D3 = (function (_super) {
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D4;
 }(getBase()));
@@ -117,8 +115,7 @@ var D4 = (function (_super) {
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D5;
 }(getBadBase()));
diff --git a/tests/baselines/reference/classExtendingNonConstructor.js b/tests/baselines/reference/classExtendingNonConstructor.js
index d33e6b4edefd7..574d50044860e 100644
--- a/tests/baselines/reference/classExtendingNonConstructor.js
+++ b/tests/baselines/reference/classExtendingNonConstructor.js
@@ -27,56 +27,49 @@ function foo() {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C1;
 }(undefined));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(true));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C3;
 }(false));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(42));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5;
 }("hello"));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }(x));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C7;
 }(foo));
diff --git a/tests/baselines/reference/classExtendingNull.js b/tests/baselines/reference/classExtendingNull.js
index d6188aaf988c6..8d5d73329aa3e 100644
--- a/tests/baselines/reference/classExtendingNull.js
+++ b/tests/baselines/reference/classExtendingNull.js
@@ -12,16 +12,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C1;
 }(null));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }((null)));
diff --git a/tests/baselines/reference/classExtendingPrimitive.js b/tests/baselines/reference/classExtendingPrimitive.js
index c23683470d037..53cb45c208187 100644
--- a/tests/baselines/reference/classExtendingPrimitive.js
+++ b/tests/baselines/reference/classExtendingPrimitive.js
@@ -24,32 +24,28 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(number));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(string));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C3;
 }(boolean));
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(Void));
@@ -62,32 +58,28 @@ void {};
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5;
 }(Null));
 var C5a = (function (_super) {
     __extends(C5a, _super);
     function C5a() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5a;
 }(null));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }(undefined));
 var C7 = (function (_super) {
     __extends(C7, _super);
     function C7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C7;
 }(Undefined));
@@ -98,8 +90,7 @@ var E;
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C8;
 }(E));
diff --git a/tests/baselines/reference/classExtendingPrimitive2.js b/tests/baselines/reference/classExtendingPrimitive2.js
index 072dc8138c78b..b32dc31a5b400 100644
--- a/tests/baselines/reference/classExtendingPrimitive2.js
+++ b/tests/baselines/reference/classExtendingPrimitive2.js
@@ -20,8 +20,7 @@ void {};
 var C5a = (function (_super) {
     __extends(C5a, _super);
     function C5a() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5a;
 }(null));
diff --git a/tests/baselines/reference/classExtendingQualifiedName.js b/tests/baselines/reference/classExtendingQualifiedName.js
index b5cf4ae13820e..fced8c2a37322 100644
--- a/tests/baselines/reference/classExtendingQualifiedName.js
+++ b/tests/baselines/reference/classExtendingQualifiedName.js
@@ -23,8 +23,7 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(M.C));
diff --git a/tests/baselines/reference/classExtendingQualifiedName2.js b/tests/baselines/reference/classExtendingQualifiedName2.js
index d1ee8b48b3a23..c133ceb87dc54 100644
--- a/tests/baselines/reference/classExtendingQualifiedName2.js
+++ b/tests/baselines/reference/classExtendingQualifiedName2.js
@@ -24,8 +24,7 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(M.C));
diff --git a/tests/baselines/reference/classExtendsAcrossFiles.js b/tests/baselines/reference/classExtendsAcrossFiles.js
index 0dcf4103f49da..5be0ab8f9c0a3 100644
--- a/tests/baselines/reference/classExtendsAcrossFiles.js
+++ b/tests/baselines/reference/classExtendsAcrossFiles.js
@@ -37,8 +37,7 @@ exports.b = {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return B;
         }(A));
@@ -63,8 +62,7 @@ exports.a = {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return B;
         }(A));
diff --git a/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js b/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
index f1a695c0b2ac4..cc4870e837b43 100644
--- a/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
+++ b/tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js
@@ -33,8 +33,7 @@ var Foo;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js b/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
index f754e140d37df..6c3dc7894452d 100644
--- a/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
+++ b/tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js
@@ -23,8 +23,7 @@ var Foo;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
diff --git a/tests/baselines/reference/classExtendsEveryObjectType.js b/tests/baselines/reference/classExtendsEveryObjectType.js
index 584b31b7e8e8e..a19f5d5cdd682 100644
--- a/tests/baselines/reference/classExtendsEveryObjectType.js
+++ b/tests/baselines/reference/classExtendsEveryObjectType.js
@@ -25,16 +25,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(I)); // error
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }({ foo: string })); // error
@@ -42,8 +40,7 @@ var x;
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C3;
 }(x)); // error
@@ -54,8 +51,7 @@ var M;
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(M)); // error
@@ -63,16 +59,14 @@ function foo() { }
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5;
 }(foo)); // error
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }([])); // error
diff --git a/tests/baselines/reference/classExtendsEveryObjectType2.js b/tests/baselines/reference/classExtendsEveryObjectType2.js
index e01e90d512d68..fbc364ca5dad2 100644
--- a/tests/baselines/reference/classExtendsEveryObjectType2.js
+++ b/tests/baselines/reference/classExtendsEveryObjectType2.js
@@ -12,16 +12,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }({ foo: string })); // error
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }([])); // error
diff --git a/tests/baselines/reference/classExtendsInterface.js b/tests/baselines/reference/classExtendsInterface.js
index 7047eaad658c2..b59462243172c 100644
--- a/tests/baselines/reference/classExtendsInterface.js
+++ b/tests/baselines/reference/classExtendsInterface.js
@@ -17,8 +17,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(Comparable));
@@ -30,8 +29,7 @@ var B = (function () {
 var A2 = (function (_super) {
     __extends(A2, _super);
     function A2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A2;
 }(Comparable2));
diff --git a/tests/baselines/reference/classExtendsInterfaceInExpression.js b/tests/baselines/reference/classExtendsInterfaceInExpression.js
index 64d519d6952b7..9dcd8dd727988 100644
--- a/tests/baselines/reference/classExtendsInterfaceInExpression.js
+++ b/tests/baselines/reference/classExtendsInterfaceInExpression.js
@@ -20,8 +20,7 @@ function factory(a) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(factory(A)));
diff --git a/tests/baselines/reference/classExtendsInterfaceInModule.js b/tests/baselines/reference/classExtendsInterfaceInModule.js
index ced164bca102f..9da8831a1389f 100644
--- a/tests/baselines/reference/classExtendsInterfaceInModule.js
+++ b/tests/baselines/reference/classExtendsInterfaceInModule.js
@@ -24,24 +24,21 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C1 = (function (_super) {
     __extends(C1, _super);
     function C1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C1;
 }(M.I1));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(M.I2));
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(Mod.Nested.I));
diff --git a/tests/baselines/reference/classExtendsItself.js b/tests/baselines/reference/classExtendsItself.js
index 654cd35c400e7..36f2263d671ee 100644
--- a/tests/baselines/reference/classExtendsItself.js
+++ b/tests/baselines/reference/classExtendsItself.js
@@ -14,24 +14,21 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(C)); // error
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(D)); // error
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(E)); // error
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly.js b/tests/baselines/reference/classExtendsItselfIndirectly.js
index ae5852d91f9a1..0f3f48d2f2c18 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly.js
@@ -20,48 +20,42 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(E)); // error
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(D));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(E2)); // error
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(C2));
 var E2 = (function (_super) {
     __extends(E2, _super);
     function E2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E2;
 }(D2));
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly2.js b/tests/baselines/reference/classExtendsItselfIndirectly2.js
index 63eeb5bc17840..e215a07c3571e 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly2.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly2.js
@@ -31,8 +31,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(N.E)); // error
@@ -41,8 +40,7 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
@@ -53,8 +51,7 @@ var N;
     var E = (function (_super) {
         __extends(E, _super);
         function E() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return E;
     }(M.D));
@@ -65,8 +62,7 @@ var O;
     var C2 = (function (_super) {
         __extends(C2, _super);
         function C2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C2;
     }(Q.E2)); // error
@@ -75,8 +71,7 @@ var O;
         var D2 = (function (_super) {
             __extends(D2, _super);
             function D2() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return D2;
         }(C2));
@@ -87,8 +82,7 @@ var O;
         var E2 = (function (_super) {
             __extends(E2, _super);
             function E2() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return E2;
         }(P.D2));
diff --git a/tests/baselines/reference/classExtendsItselfIndirectly3.js b/tests/baselines/reference/classExtendsItselfIndirectly3.js
index 4e67909f2d3be..f8366d77e1349 100644
--- a/tests/baselines/reference/classExtendsItselfIndirectly3.js
+++ b/tests/baselines/reference/classExtendsItselfIndirectly3.js
@@ -27,8 +27,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(E)); // error
@@ -41,8 +40,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -55,8 +53,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(D));
@@ -69,8 +66,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(E2)); // error
@@ -83,8 +79,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(C2));
@@ -97,8 +92,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var E2 = (function (_super) {
     __extends(E2, _super);
     function E2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E2;
 }(D2));
diff --git a/tests/baselines/reference/classExtendsMultipleBaseClasses.js b/tests/baselines/reference/classExtendsMultipleBaseClasses.js
index a185f6cf40a51..cd9c28ad28319 100644
--- a/tests/baselines/reference/classExtendsMultipleBaseClasses.js
+++ b/tests/baselines/reference/classExtendsMultipleBaseClasses.js
@@ -22,8 +22,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/classExtendsShadowedConstructorFunction.js b/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
index a7f4a4bb9d951..ddaadc2dc628a 100644
--- a/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
+++ b/tests/baselines/reference/classExtendsShadowedConstructorFunction.js
@@ -25,8 +25,7 @@ var M;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/classExtendsValidConstructorFunction.js b/tests/baselines/reference/classExtendsValidConstructorFunction.js
index 519074358cc7b..31bff6e430c4d 100644
--- a/tests/baselines/reference/classExtendsValidConstructorFunction.js
+++ b/tests/baselines/reference/classExtendsValidConstructorFunction.js
@@ -16,8 +16,7 @@ var x = new foo(); // can be used as a constructor function
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(foo)); // error, cannot extend it though
diff --git a/tests/baselines/reference/classHeritageWithTrailingSeparator.js b/tests/baselines/reference/classHeritageWithTrailingSeparator.js
index d3134a97ccd4f..12265f569bd56 100644
--- a/tests/baselines/reference/classHeritageWithTrailingSeparator.js
+++ b/tests/baselines/reference/classHeritageWithTrailingSeparator.js
@@ -17,8 +17,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/classImplementsClass2.js b/tests/baselines/reference/classImplementsClass2.js
index d525fb8a6ad07..5e3eae465438c 100644
--- a/tests/baselines/reference/classImplementsClass2.js
+++ b/tests/baselines/reference/classImplementsClass2.js
@@ -33,8 +33,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C2.prototype.foo = function () {
         return 1;
diff --git a/tests/baselines/reference/classImplementsClass3.js b/tests/baselines/reference/classImplementsClass3.js
index 3257e51b5b883..5fd003e93b908 100644
--- a/tests/baselines/reference/classImplementsClass3.js
+++ b/tests/baselines/reference/classImplementsClass3.js
@@ -37,8 +37,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass4.js b/tests/baselines/reference/classImplementsClass4.js
index f0b8698c64d3d..477288972df22 100644
--- a/tests/baselines/reference/classImplementsClass4.js
+++ b/tests/baselines/reference/classImplementsClass4.js
@@ -40,8 +40,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass5.js b/tests/baselines/reference/classImplementsClass5.js
index bf5d0141a1973..0ec258ab77bf3 100644
--- a/tests/baselines/reference/classImplementsClass5.js
+++ b/tests/baselines/reference/classImplementsClass5.js
@@ -42,8 +42,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classImplementsClass6.js b/tests/baselines/reference/classImplementsClass6.js
index f1929cdc798d0..0771c56415cc9 100644
--- a/tests/baselines/reference/classImplementsClass6.js
+++ b/tests/baselines/reference/classImplementsClass6.js
@@ -47,8 +47,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classIndexer3.js b/tests/baselines/reference/classIndexer3.js
index ab825abcd3185..2e55c89464526 100644
--- a/tests/baselines/reference/classIndexer3.js
+++ b/tests/baselines/reference/classIndexer3.js
@@ -24,8 +24,7 @@ var C123 = (function () {
 var D123 = (function (_super) {
     __extends(D123, _super);
     function D123() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D123;
 }(C123));
diff --git a/tests/baselines/reference/classInheritence.js b/tests/baselines/reference/classInheritence.js
index 11b0c5e3ae2dc..f68d76fad47f1 100644
--- a/tests/baselines/reference/classInheritence.js
+++ b/tests/baselines/reference/classInheritence.js
@@ -11,16 +11,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(A));
diff --git a/tests/baselines/reference/classIsSubtypeOfBaseType.js b/tests/baselines/reference/classIsSubtypeOfBaseType.js
index 6caa97781dd98..52300987d8ebd 100644
--- a/tests/baselines/reference/classIsSubtypeOfBaseType.js
+++ b/tests/baselines/reference/classIsSubtypeOfBaseType.js
@@ -29,16 +29,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/classOrder2.js b/tests/baselines/reference/classOrder2.js
index 49b2a428e069a..63490fa29b174 100644
--- a/tests/baselines/reference/classOrder2.js
+++ b/tests/baselines/reference/classOrder2.js
@@ -28,8 +28,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     A.prototype.foo = function () { this.bar(); };
     return A;
diff --git a/tests/baselines/reference/classOrderBug.js b/tests/baselines/reference/classOrderBug.js
index 1381df2797d04..e21a5ed64cff7 100644
--- a/tests/baselines/reference/classOrderBug.js
+++ b/tests/baselines/reference/classOrderBug.js
@@ -35,8 +35,7 @@ var baz = (function () {
 var foo = (function (_super) {
     __extends(foo, _super);
     function foo() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return foo;
 }(baz));
diff --git a/tests/baselines/reference/classSideInheritance1.js b/tests/baselines/reference/classSideInheritance1.js
index 7898ae8a2b2e8..9443509032cb1 100644
--- a/tests/baselines/reference/classSideInheritance1.js
+++ b/tests/baselines/reference/classSideInheritance1.js
@@ -33,8 +33,7 @@ var A = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(A));
diff --git a/tests/baselines/reference/classWithBaseClassButNoConstructor.js b/tests/baselines/reference/classWithBaseClassButNoConstructor.js
index 6ff5ae2ac5b2c..c25687d3c74cd 100644
--- a/tests/baselines/reference/classWithBaseClassButNoConstructor.js
+++ b/tests/baselines/reference/classWithBaseClassButNoConstructor.js
@@ -54,8 +54,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(Base));
@@ -70,8 +69,7 @@ var Base2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(Base2));
@@ -82,8 +80,7 @@ var d2 = new D(1); // ok
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(Base2));
@@ -93,8 +90,7 @@ var d4 = new D(1); // ok
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D3;
 }(Base2));
diff --git a/tests/baselines/reference/classWithConstructors.js b/tests/baselines/reference/classWithConstructors.js
index 6bb9387f67388..f445d22d18f88 100644
--- a/tests/baselines/reference/classWithConstructors.js
+++ b/tests/baselines/reference/classWithConstructors.js
@@ -75,8 +75,7 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C2));
@@ -104,8 +103,7 @@ var Generics;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C2));
diff --git a/tests/baselines/reference/classWithProtectedProperty.js b/tests/baselines/reference/classWithProtectedProperty.js
index fb07eb3d0b232..2cb8a4e0a50ad 100644
--- a/tests/baselines/reference/classWithProtectedProperty.js
+++ b/tests/baselines/reference/classWithProtectedProperty.js
@@ -48,8 +48,7 @@ C.g = function () { return ''; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.method = function () {
         // No errors
diff --git a/tests/baselines/reference/classWithStaticMembers.js b/tests/baselines/reference/classWithStaticMembers.js
index cd23c22023172..9e79780d5cc6a 100644
--- a/tests/baselines/reference/classWithStaticMembers.js
+++ b/tests/baselines/reference/classWithStaticMembers.js
@@ -45,8 +45,7 @@ var r3 = r.foo;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/classdecl.js b/tests/baselines/reference/classdecl.js
index d4f6bb11ca9ba..a3059757d2fba 100644
--- a/tests/baselines/reference/classdecl.js
+++ b/tests/baselines/reference/classdecl.js
@@ -136,8 +136,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
@@ -162,8 +161,7 @@ var m2;
         var c = (function (_super) {
             __extends(c, _super);
             function c() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return c;
         }(b));
@@ -179,8 +177,7 @@ var m2;
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return c;
 }(m1.b));
diff --git a/tests/baselines/reference/clodulesDerivedClasses.js b/tests/baselines/reference/clodulesDerivedClasses.js
index dbbbe340ba7b5..f65295627f13f 100644
--- a/tests/baselines/reference/clodulesDerivedClasses.js
+++ b/tests/baselines/reference/clodulesDerivedClasses.js
@@ -44,8 +44,7 @@ var Shape;
 var Path = (function (_super) {
     __extends(Path, _super);
     function Path() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Path;
 }(Shape));
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
index eaf031c2571c6..85c0e398fbd0f 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInAccessors.js
@@ -68,8 +68,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b.prototype, "prop2", {
         get: function () {
@@ -89,8 +88,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(c.prototype, "prop2", {
         get: function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js b/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
index 14965b53abdfe..81c069da169d9 100644
--- a/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
+++ b/tests/baselines/reference/collisionSuperAndLocalFunctionInMethod.js
@@ -50,8 +50,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.foo = function () {
         function _super() {
@@ -64,8 +63,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     c.prototype.foo = function () {
         var x = function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js b/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
index 55db3a5e62536..26f782c0d17aa 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInAccessors.js
@@ -58,8 +58,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b.prototype, "prop2", {
         get: function () {
@@ -77,8 +76,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(c.prototype, "prop2", {
         get: function () {
diff --git a/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js b/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
index c5bb6ebcd0163..0524d993ba1b0 100644
--- a/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
+++ b/tests/baselines/reference/collisionSuperAndLocalVarInMethod.js
@@ -36,8 +36,7 @@ var Foo = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.foo = function () {
         var _super = 10; // Should be error 
@@ -47,8 +46,7 @@ var b = (function (_super) {
 var c = (function (_super) {
     __extends(c, _super);
     function c() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     c.prototype.foo = function () {
         var x = function () {
diff --git a/tests/baselines/reference/collisionSuperAndNameResolution.js b/tests/baselines/reference/collisionSuperAndNameResolution.js
index 5501b3e2df439..cb5636ec904b2 100644
--- a/tests/baselines/reference/collisionSuperAndNameResolution.js
+++ b/tests/baselines/reference/collisionSuperAndNameResolution.js
@@ -27,8 +27,7 @@ var base = (function () {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Foo.prototype.x = function () {
         console.log(_super); // Error as this doesnt not resolve to user defined _super
diff --git a/tests/baselines/reference/collisionSuperAndParameter1.js b/tests/baselines/reference/collisionSuperAndParameter1.js
index 105fe8497671a..ed19500f9d4d8 100644
--- a/tests/baselines/reference/collisionSuperAndParameter1.js
+++ b/tests/baselines/reference/collisionSuperAndParameter1.js
@@ -23,8 +23,7 @@ var Foo = (function () {
 var Foo2 = (function (_super) {
     __extends(Foo2, _super);
     function Foo2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Foo2.prototype.x = function () {
         var lambda = function (_super) {
diff --git a/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js b/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
index 59b64e4a9bac4..9e8132c68838f 100644
--- a/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
+++ b/tests/baselines/reference/collisionThisExpressionAndLocalVarWithSuperExperssion.js
@@ -34,8 +34,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.foo = function () {
         var _this = this;
@@ -47,8 +46,7 @@ var b = (function (_super) {
 var b2 = (function (_super) {
     __extends(b2, _super);
     function b2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b2.prototype.foo = function () {
         var _this = this;
diff --git a/tests/baselines/reference/commentsInheritance.js b/tests/baselines/reference/commentsInheritance.js
index a8a8d5fa8899b..3527f5d23bb6f 100644
--- a/tests/baselines/reference/commentsInheritance.js
+++ b/tests/baselines/reference/commentsInheritance.js
@@ -258,8 +258,7 @@ c2_i = c3_i;
 var c4 = (function (_super) {
     __extends(c4, _super);
     function c4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return c4;
 }(c2));
diff --git a/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js b/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
index fb7a811cba3e0..a263a30e38285 100644
--- a/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
+++ b/tests/baselines/reference/comparisonOperatorWithIdenticalObjects.js
@@ -227,16 +227,14 @@ var Base = (function () {
 var A2 = (function (_super) {
     __extends(A2, _super);
     function A2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A2;
 }(Base));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
index 675235ae3241c..b8584522b7baf 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnCallSignature.js
@@ -182,8 +182,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
index ceb386b3e141e..93e1e876a7fd4 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnConstructorSignature.js
@@ -182,8 +182,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
index 03494b4f88d1f..a8973bf2c1098 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnIndexSignature.js
@@ -125,8 +125,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
index ee8185802d4c7..4539538782d77 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedCallSignature.js
@@ -163,8 +163,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
index 5a36f91c7ca23..5e8412bc3610a 100644
--- a/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithNoRelationshipObjectsOnInstantiatedConstructorSignature.js
@@ -163,8 +163,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
index f23588dcbc5d7..d30c3586b12c3 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnCallSignature.js
@@ -273,8 +273,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
index cc6fe9ce64068..4235c1352d480 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnConstructorSignature.js
@@ -235,8 +235,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
index d401defc2ed60..9a6fecd668d21 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnIndexSignature.js
@@ -121,8 +121,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
index b4b531b8084cf..5721a4524864c 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedCallSignature.js
@@ -178,8 +178,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
index 69f46e2ccd207..b6bf8a16e614e 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnInstantiatedConstructorSignature.js
@@ -178,8 +178,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
index 171f21e77fcfa..690214fc00fa6 100644
--- a/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
+++ b/tests/baselines/reference/comparisonOperatorWithSubtypeObjectOnProperty.js
@@ -92,8 +92,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -115,8 +114,7 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A2));
diff --git a/tests/baselines/reference/complexClassRelationships.js b/tests/baselines/reference/complexClassRelationships.js
index 523002e5b571e..4f48e5fc2c5d2 100644
--- a/tests/baselines/reference/complexClassRelationships.js
+++ b/tests/baselines/reference/complexClassRelationships.js
@@ -57,8 +57,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.createEmpty = function () {
         var item = new Derived();
diff --git a/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js b/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
index 1201dcf3d3de7..326c0830c4fe8 100644
--- a/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
+++ b/tests/baselines/reference/complicatedGenericRecursiveBaseClassReference.js
@@ -14,8 +14,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var S18 = (function (_super) {
     __extends(S18, _super);
     function S18() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return S18;
 }(S18));
diff --git a/tests/baselines/reference/computedPropertyNames24_ES5.js b/tests/baselines/reference/computedPropertyNames24_ES5.js
index 00186f40a2817..ff9112755bd53 100644
--- a/tests/baselines/reference/computedPropertyNames24_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames24_ES5.js
@@ -25,8 +25,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype[_super.bar.call(this)] = function () { };
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames25_ES5.js b/tests/baselines/reference/computedPropertyNames25_ES5.js
index afc0e20eca9e1..dad9c5c291aeb 100644
--- a/tests/baselines/reference/computedPropertyNames25_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames25_ES5.js
@@ -30,8 +30,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () {
         var obj = (_a = {},
diff --git a/tests/baselines/reference/computedPropertyNames26_ES5.js b/tests/baselines/reference/computedPropertyNames26_ES5.js
index 6b75da57e9af1..5db7768270a6f 100644
--- a/tests/baselines/reference/computedPropertyNames26_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames26_ES5.js
@@ -27,8 +27,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype[(_a = {}, _a[_super.bar.call(this)] = 1, _a)[0]] = function () { };
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames27_ES5.js b/tests/baselines/reference/computedPropertyNames27_ES5.js
index 3c89ecd50c068..381805659e271 100644
--- a/tests/baselines/reference/computedPropertyNames27_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames27_ES5.js
@@ -19,8 +19,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype[(_this = _super.call(this) || this, "prop")] = function () { };
     return C;
diff --git a/tests/baselines/reference/computedPropertyNames31_ES5.js b/tests/baselines/reference/computedPropertyNames31_ES5.js
index 7b803e9c98793..00cc765f4cc61 100644
--- a/tests/baselines/reference/computedPropertyNames31_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames31_ES5.js
@@ -32,8 +32,7 @@ var Base = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () {
         var _this = this;
diff --git a/tests/baselines/reference/computedPropertyNames43_ES5.js b/tests/baselines/reference/computedPropertyNames43_ES5.js
index 293d017734ec3..b1bb0fec72c22 100644
--- a/tests/baselines/reference/computedPropertyNames43_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames43_ES5.js
@@ -36,8 +36,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(D.prototype, "get1", {
         // Computed properties
diff --git a/tests/baselines/reference/computedPropertyNames44_ES5.js b/tests/baselines/reference/computedPropertyNames44_ES5.js
index c990298c4ac76..bf940f15014a4 100644
--- a/tests/baselines/reference/computedPropertyNames44_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames44_ES5.js
@@ -40,8 +40,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(D.prototype, "set1", {
         set: function (p) { },
diff --git a/tests/baselines/reference/computedPropertyNames45_ES5.js b/tests/baselines/reference/computedPropertyNames45_ES5.js
index f5a31fffabbf8..5b5d64f9bf024 100644
--- a/tests/baselines/reference/computedPropertyNames45_ES5.js
+++ b/tests/baselines/reference/computedPropertyNames45_ES5.js
@@ -41,8 +41,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(D.prototype, "set1", {
         set: function (p) { },
diff --git a/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js b/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
index a6d00d847f32a..408571af42aab 100644
--- a/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
+++ b/tests/baselines/reference/conditionalOperatorWithIdenticalBCT.js
@@ -63,8 +63,7 @@ var X = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(X));
@@ -72,8 +71,7 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(X));
diff --git a/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js b/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
index 58b050c5ebeef..0ac935a582ad0 100644
--- a/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
+++ b/tests/baselines/reference/conditionalOperatorWithoutIdenticalBCT.js
@@ -39,8 +39,7 @@ var X = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(X));
@@ -48,8 +47,7 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(X));
diff --git a/tests/baselines/reference/constantOverloadFunction.js b/tests/baselines/reference/constantOverloadFunction.js
index 934c7eceb0e5b..160191c5ca03d 100644
--- a/tests/baselines/reference/constantOverloadFunction.js
+++ b/tests/baselines/reference/constantOverloadFunction.js
@@ -28,8 +28,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -37,8 +36,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -46,8 +44,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js b/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
index 217cf23f9cb62..509f9ba70e6c5 100644
--- a/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
+++ b/tests/baselines/reference/constantOverloadFunctionNoSubtypeError.js
@@ -29,8 +29,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -38,8 +37,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -47,8 +45,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js b/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
index 511c293d41736..7908d36a56a44 100644
--- a/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
+++ b/tests/baselines/reference/constraintCheckInGenericBaseTypeReference.js
@@ -40,8 +40,7 @@ var GenericBase = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(GenericBase));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
index 0e14e958b284c..6b308d88896b5 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance2.js
@@ -84,24 +84,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
index cb2cadb76987d..09abd6e0868e9 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance3.js
@@ -129,24 +129,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
index 25c6983911784..4e9a8c59bf994 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance4.js
@@ -74,24 +74,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
index dcd972d3a971b..91ec3b313bb0c 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance5.js
@@ -64,24 +64,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js b/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
index 69fdebe8f5cf4..edafb00991681 100644
--- a/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
+++ b/tests/baselines/reference/constructSignatureAssignabilityInInheritance6.js
@@ -67,24 +67,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
index b16721d0accf3..45ed976e191c4 100644
--- a/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
+++ b/tests/baselines/reference/constructorFunctionTypeIsAssignableToBaseType.js
@@ -33,16 +33,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/constructorHasPrototypeProperty.js b/tests/baselines/reference/constructorHasPrototypeProperty.js
index 956e8cd2e0d2e..a16694cdbf54d 100644
--- a/tests/baselines/reference/constructorHasPrototypeProperty.js
+++ b/tests/baselines/reference/constructorHasPrototypeProperty.js
@@ -47,8 +47,7 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
@@ -67,8 +66,7 @@ var Generic;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
index 1b91e8a131a90..2e3190c15c825 100644
--- a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
+++ b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
@@ -525,8 +525,7 @@ method2();
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.method2 = function () {
         return this.method1(2);
diff --git a/tests/baselines/reference/contextualTypingArrayOfLambdas.js b/tests/baselines/reference/contextualTypingArrayOfLambdas.js
index 365e17afc9b5e..caf7ed445e566 100644
--- a/tests/baselines/reference/contextualTypingArrayOfLambdas.js
+++ b/tests/baselines/reference/contextualTypingArrayOfLambdas.js
@@ -28,16 +28,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/contextualTypingOfConditionalExpression.js b/tests/baselines/reference/contextualTypingOfConditionalExpression.js
index 7be8079cfd9f2..a6ce98f61e291 100644
--- a/tests/baselines/reference/contextualTypingOfConditionalExpression.js
+++ b/tests/baselines/reference/contextualTypingOfConditionalExpression.js
@@ -29,16 +29,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/contextualTypingOfConditionalExpression2.js b/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
index 102562a841ae5..e3bd1643cfb8e 100644
--- a/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
+++ b/tests/baselines/reference/contextualTypingOfConditionalExpression2.js
@@ -26,16 +26,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js b/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
index 5fafe95c1a8f6..89979da4812a4 100644
--- a/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
+++ b/tests/baselines/reference/crashInsourcePropertyIsRelatableToTargetProperty.js
@@ -25,8 +25,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declFileClassExtendsNull.js b/tests/baselines/reference/declFileClassExtendsNull.js
index 58bff801774b1..30ddc3f08bf39 100644
--- a/tests/baselines/reference/declFileClassExtendsNull.js
+++ b/tests/baselines/reference/declFileClassExtendsNull.js
@@ -12,8 +12,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ExtendsNull = (function (_super) {
     __extends(ExtendsNull, _super);
     function ExtendsNull() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ExtendsNull;
 }(null));
diff --git a/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js b/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
index d58dcd1f536f4..442007d9b9a50 100644
--- a/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
+++ b/tests/baselines/reference/declFileForFunctionTypeAsTypeParameter.js
@@ -23,8 +23,7 @@ var X = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(X));
diff --git a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
index 2f68300a4bf8c..47593dc9d6868 100644
--- a/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
+++ b/tests/baselines/reference/declFileGenericClassWithGenericExtendedClass.js
@@ -26,8 +26,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/declFileGenericType.js b/tests/baselines/reference/declFileGenericType.js
index 2ed404342d733..b2e99a73ad762 100644
--- a/tests/baselines/reference/declFileGenericType.js
+++ b/tests/baselines/reference/declFileGenericType.js
@@ -91,8 +91,7 @@ exports.g = C.F5();
 var h = (function (_super) {
     __extends(h, _super);
     function h() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return h;
 }(C.A));
diff --git a/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js b/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
index c9c569f86762c..cd10a9e94560d 100644
--- a/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
+++ b/tests/baselines/reference/declFileWithClassNameConflictingWithClassReferredByExtendsClause.js
@@ -35,8 +35,7 @@ var X;
             var W = (function (_super) {
                 __extends(W, _super);
                 function W() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return W;
             }(A.B.Base.W));
@@ -55,8 +54,7 @@ var X;
                 var W = (function (_super) {
                     __extends(W, _super);
                     function W() {
-                        var _this = _super.apply(this, arguments) || this;
-                        return _this;
+                        return _super.apply(this, arguments) || this;
                     }
                     return W;
                 }(X.Y.base.W));
diff --git a/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js b/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
index 3681f9fa859ee..f3b93efc9eb84 100644
--- a/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
+++ b/tests/baselines/reference/declFileWithExtendsClauseThatHasItsContainerNameConflict.js
@@ -45,8 +45,7 @@ var A;
             var ContextMenu = (function (_super) {
                 __extends(ContextMenu, _super);
                 function ContextMenu() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return ContextMenu;
             }(B.EventManager));
diff --git a/tests/baselines/reference/declarationEmitExpressionInExtends.js b/tests/baselines/reference/declarationEmitExpressionInExtends.js
index 8973fbb145558..726c7b22446c5 100644
--- a/tests/baselines/reference/declarationEmitExpressionInExtends.js
+++ b/tests/baselines/reference/declarationEmitExpressionInExtends.js
@@ -29,8 +29,7 @@ var Q = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(x));
diff --git a/tests/baselines/reference/declarationEmitExpressionInExtends2.js b/tests/baselines/reference/declarationEmitExpressionInExtends2.js
index ff75df8bababf..4081de6d3ed56 100644
--- a/tests/baselines/reference/declarationEmitExpressionInExtends2.js
+++ b/tests/baselines/reference/declarationEmitExpressionInExtends2.js
@@ -29,8 +29,7 @@ function getClass(c) {
 var MyClass = (function (_super) {
     __extends(MyClass, _super);
     function MyClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyClass;
 }(getClass(2)));
diff --git a/tests/baselines/reference/declarationEmitExpressionInExtends3.js b/tests/baselines/reference/declarationEmitExpressionInExtends3.js
index fc73eb5dbd008..f36a7e250a29e 100644
--- a/tests/baselines/reference/declarationEmitExpressionInExtends3.js
+++ b/tests/baselines/reference/declarationEmitExpressionInExtends3.js
@@ -70,8 +70,7 @@ function getExportedClass(c) {
 var MyClass = (function (_super) {
     __extends(MyClass, _super);
     function MyClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyClass;
 }(getLocalClass(undefined)));
@@ -79,8 +78,7 @@ exports.MyClass = MyClass;
 var MyClass2 = (function (_super) {
     __extends(MyClass2, _super);
     function MyClass2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyClass2;
 }(getExportedClass(undefined)));
@@ -88,8 +86,7 @@ exports.MyClass2 = MyClass2;
 var MyClass3 = (function (_super) {
     __extends(MyClass3, _super);
     function MyClass3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyClass3;
 }(getExportedClass(undefined)));
@@ -97,8 +94,7 @@ exports.MyClass3 = MyClass3;
 var MyClass4 = (function (_super) {
     __extends(MyClass4, _super);
     function MyClass4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyClass4;
 }(getExportedClass(undefined)));
diff --git a/tests/baselines/reference/declarationEmitExpressionInExtends4.js b/tests/baselines/reference/declarationEmitExpressionInExtends4.js
index ed34544256b6d..b90c1275197bd 100644
--- a/tests/baselines/reference/declarationEmitExpressionInExtends4.js
+++ b/tests/baselines/reference/declarationEmitExpressionInExtends4.js
@@ -33,24 +33,21 @@ function getSomething() {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(getSomething()));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(SomeUndefinedFunction()));
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C3;
 }(SomeUndefinedFunction));
diff --git a/tests/baselines/reference/declarationEmitNameConflicts3.js b/tests/baselines/reference/declarationEmitNameConflicts3.js
index c17f624087dc2..09dcea089a849 100644
--- a/tests/baselines/reference/declarationEmitNameConflicts3.js
+++ b/tests/baselines/reference/declarationEmitNameConflicts3.js
@@ -64,8 +64,7 @@ var M;
         var E = (function (_super) {
             __extends(E, _super);
             function E() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return E;
         }(C));
diff --git a/tests/baselines/reference/declarationEmitProtectedMembers.js b/tests/baselines/reference/declarationEmitProtectedMembers.js
index cc4e27895f14d..9ae8e8a2437d3 100644
--- a/tests/baselines/reference/declarationEmitProtectedMembers.js
+++ b/tests/baselines/reference/declarationEmitProtectedMembers.js
@@ -88,8 +88,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C2.prototype.f = function () {
         return _super.prototype.f.call(this) + this.x;
@@ -103,8 +102,7 @@ var C2 = (function (_super) {
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C3.prototype.f = function () {
         return _super.prototype.f.call(this);
diff --git a/tests/baselines/reference/declarationEmitThisPredicates01.js b/tests/baselines/reference/declarationEmitThisPredicates01.js
index 0b364e90e45b7..ad9b7a7037330 100644
--- a/tests/baselines/reference/declarationEmitThisPredicates01.js
+++ b/tests/baselines/reference/declarationEmitThisPredicates01.js
@@ -28,8 +28,7 @@ exports.C = C;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js b/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
index aea36311add1d..fe7995462ef2c 100644
--- a/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
+++ b/tests/baselines/reference/declarationEmitThisPredicatesWithPrivateName01.js
@@ -28,8 +28,7 @@ exports.C = C;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/declareDottedExtend.js b/tests/baselines/reference/declareDottedExtend.js
index f167928087d05..3c7588d2b6cc9 100644
--- a/tests/baselines/reference/declareDottedExtend.js
+++ b/tests/baselines/reference/declareDottedExtend.js
@@ -21,16 +21,14 @@ var ab = A.B;
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(ab.C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(A.B.C));
diff --git a/tests/baselines/reference/decoratorOnClassMethod12.js b/tests/baselines/reference/decoratorOnClassMethod12.js
index 6d95c696176ed..7dd5f69818259 100644
--- a/tests/baselines/reference/decoratorOnClassMethod12.js
+++ b/tests/baselines/reference/decoratorOnClassMethod12.js
@@ -32,8 +32,7 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         C.prototype.method = function () { };
         return C;
diff --git a/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js b/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
index 6dcf8f3fd8358..7f6b83593ca75 100644
--- a/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
+++ b/tests/baselines/reference/derivedClassFunctionOverridesBaseClassAccessor.js
@@ -38,8 +38,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.x = function () {
         return 1;
diff --git a/tests/baselines/reference/derivedClassIncludesInheritedMembers.js b/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
index 2fe5906e74629..8224473cb548c 100644
--- a/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
+++ b/tests/baselines/reference/derivedClassIncludesInheritedMembers.js
@@ -68,8 +68,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -90,8 +89,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js b/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
index dc63ccb21d8ab..4753e39539073 100644
--- a/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
+++ b/tests/baselines/reference/derivedClassOverridesIndexersWithAssignmentCompatibility.js
@@ -32,8 +32,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -46,8 +45,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesPrivates.js b/tests/baselines/reference/derivedClassOverridesPrivates.js
index 7ab70d93ff281..1a58c038feac6 100644
--- a/tests/baselines/reference/derivedClassOverridesPrivates.js
+++ b/tests/baselines/reference/derivedClassOverridesPrivates.js
@@ -29,8 +29,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -42,8 +41,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
index ac9b401a45c4b..6797eef0e7726 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers2.js
@@ -131,8 +131,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js b/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
index eeaf80061af82..06f809976008b 100644
--- a/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
+++ b/tests/baselines/reference/derivedClassOverridesProtectedMembers4.js
@@ -30,16 +30,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived1));
diff --git a/tests/baselines/reference/derivedClassOverridesPublicMembers.js b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
index 92fbc07e77405..7943d904deafb 100644
--- a/tests/baselines/reference/derivedClassOverridesPublicMembers.js
+++ b/tests/baselines/reference/derivedClassOverridesPublicMembers.js
@@ -129,8 +129,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js b/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
index f2d8f72edfb7d..e42ff9c9e1d07 100644
--- a/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
+++ b/tests/baselines/reference/derivedClassOverridesWithoutSubtype.js
@@ -37,8 +37,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -50,8 +49,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/derivedClassTransitivity.js b/tests/baselines/reference/derivedClassTransitivity.js
index 0e88d3664c660..a76ac8101a098 100644
--- a/tests/baselines/reference/derivedClassTransitivity.js
+++ b/tests/baselines/reference/derivedClassTransitivity.js
@@ -36,8 +36,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function () { }; // ok to drop parameters
     return D;
@@ -45,8 +44,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function (x) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity2.js b/tests/baselines/reference/derivedClassTransitivity2.js
index 5a3f8f3cf57dd..a3894863696b4 100644
--- a/tests/baselines/reference/derivedClassTransitivity2.js
+++ b/tests/baselines/reference/derivedClassTransitivity2.js
@@ -36,8 +36,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function (x) { }; // ok to drop parameters
     return D;
@@ -45,8 +44,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function (x, y) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity3.js b/tests/baselines/reference/derivedClassTransitivity3.js
index f6aa6963795a7..71dfecb346f01 100644
--- a/tests/baselines/reference/derivedClassTransitivity3.js
+++ b/tests/baselines/reference/derivedClassTransitivity3.js
@@ -36,8 +36,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function (x) { }; // ok to drop parameters
     return D;
@@ -45,8 +44,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function (x, y) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassTransitivity4.js b/tests/baselines/reference/derivedClassTransitivity4.js
index 8d18e311d8879..0030ce702d82a 100644
--- a/tests/baselines/reference/derivedClassTransitivity4.js
+++ b/tests/baselines/reference/derivedClassTransitivity4.js
@@ -36,8 +36,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function () { }; // ok to drop parameters
     return D;
@@ -45,8 +44,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo = function (x) { }; // ok to add optional parameters
     return E;
diff --git a/tests/baselines/reference/derivedClassWithAny.js b/tests/baselines/reference/derivedClassWithAny.js
index 70885570373e5..2a199e5586152 100644
--- a/tests/baselines/reference/derivedClassWithAny.js
+++ b/tests/baselines/reference/derivedClassWithAny.js
@@ -91,8 +91,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(D.prototype, "X", {
         get: function () {
@@ -120,8 +119,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(E.prototype, "X", {
         get: function () { return ''; },
diff --git a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
index 24d43468dcf81..0542815c4e4b7 100644
--- a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
+++ b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingProtectedInstance.js
@@ -46,8 +46,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
index a6b7710ec6dce..41869cad416fd 100644
--- a/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
+++ b/tests/baselines/reference/derivedClassWithPrivateInstanceShadowingPublicInstance.js
@@ -56,8 +56,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
index 3da7720b77e79..10ae3cb35c855 100644
--- a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
+++ b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingProtectedStatic.js
@@ -45,8 +45,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
index 57f474affe759..3f2c2a3b811a4 100644
--- a/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
+++ b/tests/baselines/reference/derivedClassWithPrivateStaticShadowingPublicStatic.js
@@ -58,8 +58,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.fn = function () {
         return '';
diff --git a/tests/baselines/reference/derivedClasses.js b/tests/baselines/reference/derivedClasses.js
index 27947b4f05f19..3e097a9b139c3 100644
--- a/tests/baselines/reference/derivedClasses.js
+++ b/tests/baselines/reference/derivedClasses.js
@@ -39,8 +39,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Red = (function (_super) {
     __extends(Red, _super);
     function Red() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Red.prototype.shade = function () {
         var _this = this;
@@ -59,8 +58,7 @@ var Color = (function () {
 var Blue = (function (_super) {
     __extends(Blue, _super);
     function Blue() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Blue.prototype.shade = function () {
         var _this = this;
diff --git a/tests/baselines/reference/derivedGenericClassWithAny.js b/tests/baselines/reference/derivedGenericClassWithAny.js
index e31b18e11e71f..1822f3fcc47dd 100644
--- a/tests/baselines/reference/derivedGenericClassWithAny.js
+++ b/tests/baselines/reference/derivedGenericClassWithAny.js
@@ -64,8 +64,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(D.prototype, "X", {
         get: function () {
@@ -93,8 +92,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(E.prototype, "X", {
         get: function () { return ''; } // error
diff --git a/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js b/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
index 4430ad5a31b82..c17922e05eee0 100644
--- a/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
+++ b/tests/baselines/reference/derivedTypeAccessesHiddenBaseCallViaSuperPropertyAccess.js
@@ -34,8 +34,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.foo = function (x) {
         return null;
diff --git a/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js b/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
index f6415d8496553..6fe690fd692db 100644
--- a/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
+++ b/tests/baselines/reference/derivedTypeDoesNotRequireExtendsClause.js
@@ -39,8 +39,7 @@ var Derived = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/emitThisInSuperMethodCall.js b/tests/baselines/reference/emitThisInSuperMethodCall.js
index 4bb83a7c172a2..1f7ed8bfa9443 100644
--- a/tests/baselines/reference/emitThisInSuperMethodCall.js
+++ b/tests/baselines/reference/emitThisInSuperMethodCall.js
@@ -43,8 +43,7 @@ var User = (function () {
 var RegisteredUser = (function (_super) {
     __extends(RegisteredUser, _super);
     function RegisteredUser() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     RegisteredUser.prototype.f = function () {
         (function () {
diff --git a/tests/baselines/reference/emptyModuleName.js b/tests/baselines/reference/emptyModuleName.js
index 2292f0a494ae9..3ed21cf217a64 100644
--- a/tests/baselines/reference/emptyModuleName.js
+++ b/tests/baselines/reference/emptyModuleName.js
@@ -14,8 +14,7 @@ var A = require("");
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js b/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
index 7b05688b8c8de..ed2e1aa7f06e7 100644
--- a/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
+++ b/tests/baselines/reference/errorForwardReferenceForwadingConstructor.js
@@ -30,8 +30,7 @@ var base = (function () {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return derived;
 }(base));
diff --git a/tests/baselines/reference/errorSuperPropertyAccess.js b/tests/baselines/reference/errorSuperPropertyAccess.js
index 0fef86493f1f6..e12a758b0537c 100644
--- a/tests/baselines/reference/errorSuperPropertyAccess.js
+++ b/tests/baselines/reference/errorSuperPropertyAccess.js
@@ -247,8 +247,7 @@ var SomeDerived2 = (function (_super) {
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SomeDerived3.fn = function () {
         _super.publicStaticMember = 3;
diff --git a/tests/baselines/reference/errorsInGenericTypeReference.js b/tests/baselines/reference/errorsInGenericTypeReference.js
index d3d275ff25b35..6dd9f62edcbc0 100644
--- a/tests/baselines/reference/errorsInGenericTypeReference.js
+++ b/tests/baselines/reference/errorsInGenericTypeReference.js
@@ -135,8 +135,7 @@ var testClass6 = (function () {
 var testClass7 = (function (_super) {
     __extends(testClass7, _super);
     function testClass7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return testClass7;
 }(Foo)); // error: could not find symbol V
diff --git a/tests/baselines/reference/es6ClassTest2.js b/tests/baselines/reference/es6ClassTest2.js
index b3787405ff74e..de5657b087e72 100644
--- a/tests/baselines/reference/es6ClassTest2.js
+++ b/tests/baselines/reference/es6ClassTest2.js
@@ -314,8 +314,7 @@ var BaseClassWithConstructor = (function () {
 var ChildClassWithoutConstructor = (function (_super) {
     __extends(ChildClassWithoutConstructor, _super);
     function ChildClassWithoutConstructor() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ChildClassWithoutConstructor;
 }(BaseClassWithConstructor));
diff --git a/tests/baselines/reference/es6ClassTest7.js b/tests/baselines/reference/es6ClassTest7.js
index 6e30a1d7879e9..f786fce446187 100644
--- a/tests/baselines/reference/es6ClassTest7.js
+++ b/tests/baselines/reference/es6ClassTest7.js
@@ -17,8 +17,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar;
 }(M.Foo));
diff --git a/tests/baselines/reference/exportAssignmentOfGenericType1.js b/tests/baselines/reference/exportAssignmentOfGenericType1.js
index 439f74a9c9d0a..7c1831ecac487 100644
--- a/tests/baselines/reference/exportAssignmentOfGenericType1.js
+++ b/tests/baselines/reference/exportAssignmentOfGenericType1.js
@@ -34,8 +34,7 @@ define(["require", "exports", "exportAssignmentOfGenericType1_0"], function (req
     var M = (function (_super) {
         __extends(M, _super);
         function M() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return M;
     }(q));
diff --git a/tests/baselines/reference/exportDeclarationInInternalModule.js b/tests/baselines/reference/exportDeclarationInInternalModule.js
index b6eec928a071b..518c66369476d 100644
--- a/tests/baselines/reference/exportDeclarationInInternalModule.js
+++ b/tests/baselines/reference/exportDeclarationInInternalModule.js
@@ -32,8 +32,7 @@ var Bbb = (function () {
 var Aaa = (function (_super) {
     __extends(Aaa, _super);
     function Aaa() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Aaa;
 }(Bbb));
diff --git a/tests/baselines/reference/extBaseClass1.js b/tests/baselines/reference/extBaseClass1.js
index 508eea66500a7..b20a463338cdc 100644
--- a/tests/baselines/reference/extBaseClass1.js
+++ b/tests/baselines/reference/extBaseClass1.js
@@ -37,8 +37,7 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C;
     }(B));
@@ -49,8 +48,7 @@ var M;
     var C2 = (function (_super) {
         __extends(C2, _super);
         function C2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C2;
     }(M.B));
@@ -61,8 +59,7 @@ var N;
     var C3 = (function (_super) {
         __extends(C3, _super);
         function C3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C3;
     }(M.B));
diff --git a/tests/baselines/reference/extBaseClass2.js b/tests/baselines/reference/extBaseClass2.js
index 14f3d69ef3eb5..3ab217eb01979 100644
--- a/tests/baselines/reference/extBaseClass2.js
+++ b/tests/baselines/reference/extBaseClass2.js
@@ -21,8 +21,7 @@ var N;
     var C4 = (function (_super) {
         __extends(C4, _super);
         function C4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C4;
     }(M.B));
@@ -33,8 +32,7 @@ var M;
     var C5 = (function (_super) {
         __extends(C5, _super);
         function C5() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C5;
     }(B));
diff --git a/tests/baselines/reference/extendAndImplementTheSameBaseType.js b/tests/baselines/reference/extendAndImplementTheSameBaseType.js
index 03bf54db78dba..74bbf3a27ac93 100644
--- a/tests/baselines/reference/extendAndImplementTheSameBaseType.js
+++ b/tests/baselines/reference/extendAndImplementTheSameBaseType.js
@@ -28,8 +28,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendAndImplementTheSameBaseType2.js b/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
index 50db54a05e9ba..fa7963487d579 100644
--- a/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
+++ b/tests/baselines/reference/extendAndImplementTheSameBaseType2.js
@@ -33,8 +33,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js b/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
index 6cab3a8c7f609..596ab319b2ce8 100644
--- a/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
+++ b/tests/baselines/reference/extendBaseClassBeforeItsDeclared.js
@@ -12,8 +12,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return derived;
 }(base));
diff --git a/tests/baselines/reference/extendClassExpressionFromModule.js b/tests/baselines/reference/extendClassExpressionFromModule.js
index c0cb5d4902327..895cdedfaff65 100644
--- a/tests/baselines/reference/extendClassExpressionFromModule.js
+++ b/tests/baselines/reference/extendClassExpressionFromModule.js
@@ -31,8 +31,7 @@ var x = foo1;
 var y = (function (_super) {
     __extends(y, _super);
     function y() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return y;
 }(x));
diff --git a/tests/baselines/reference/extendConstructSignatureInInterface.js b/tests/baselines/reference/extendConstructSignatureInInterface.js
index 6985657ced311..4bf92dd0315d9 100644
--- a/tests/baselines/reference/extendConstructSignatureInInterface.js
+++ b/tests/baselines/reference/extendConstructSignatureInInterface.js
@@ -20,8 +20,7 @@ var CStatic;
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(CStatic));
diff --git a/tests/baselines/reference/extendNonClassSymbol1.js b/tests/baselines/reference/extendNonClassSymbol1.js
index 829b1ae1a3234..b23b601bc2902 100644
--- a/tests/baselines/reference/extendNonClassSymbol1.js
+++ b/tests/baselines/reference/extendNonClassSymbol1.js
@@ -19,8 +19,7 @@ var x = A;
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(x)); // error, could not find symbol xs
diff --git a/tests/baselines/reference/extendNonClassSymbol2.js b/tests/baselines/reference/extendNonClassSymbol2.js
index 9a2d4fb2adf5d..78dfaa918277e 100644
--- a/tests/baselines/reference/extendNonClassSymbol2.js
+++ b/tests/baselines/reference/extendNonClassSymbol2.js
@@ -18,8 +18,7 @@ var x = new Foo(); // legal, considered a constructor function
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(Foo)); // error, could not find symbol Foo
diff --git a/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js b/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
index db2fcdbbf3660..da081154d8a2e 100644
--- a/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
+++ b/tests/baselines/reference/extendingClassFromAliasAndUsageInIndexer.js
@@ -51,8 +51,7 @@ var Backbone = require("./extendingClassFromAliasAndUsageInIndexer_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
@@ -68,8 +67,7 @@ var Backbone = require("./extendingClassFromAliasAndUsageInIndexer_backbone");
 var VisualizationModel = (function (_super) {
     __extends(VisualizationModel, _super);
     function VisualizationModel() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return VisualizationModel;
 }(Backbone.Model));
diff --git a/tests/baselines/reference/extendsClauseAlreadySeen.js b/tests/baselines/reference/extendsClauseAlreadySeen.js
index db11c06d78261..267cd86eed09f 100644
--- a/tests/baselines/reference/extendsClauseAlreadySeen.js
+++ b/tests/baselines/reference/extendsClauseAlreadySeen.js
@@ -20,8 +20,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/extendsClauseAlreadySeen2.js b/tests/baselines/reference/extendsClauseAlreadySeen2.js
index f61317c2d5061..76fbc3365af2f 100644
--- a/tests/baselines/reference/extendsClauseAlreadySeen2.js
+++ b/tests/baselines/reference/extendsClauseAlreadySeen2.js
@@ -20,8 +20,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.baz = function () { };
     return D;
diff --git a/tests/baselines/reference/fluentClasses.js b/tests/baselines/reference/fluentClasses.js
index 68a2960b03f33..ac44416e13392 100644
--- a/tests/baselines/reference/fluentClasses.js
+++ b/tests/baselines/reference/fluentClasses.js
@@ -35,8 +35,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () {
         return this;
@@ -46,8 +45,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.baz = function () {
         return this;
diff --git a/tests/baselines/reference/for-inStatements.js b/tests/baselines/reference/for-inStatements.js
index 7176a27ebc999..4f52b5e1456f6 100644
--- a/tests/baselines/reference/for-inStatements.js
+++ b/tests/baselines/reference/for-inStatements.js
@@ -126,8 +126,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.boz = function () {
         for (var x in this.biz()) { }
diff --git a/tests/baselines/reference/for-inStatementsInvalid.js b/tests/baselines/reference/for-inStatementsInvalid.js
index cca8e94dcab99..d1181760a367d 100644
--- a/tests/baselines/reference/for-inStatementsInvalid.js
+++ b/tests/baselines/reference/for-inStatementsInvalid.js
@@ -107,8 +107,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.boz = function () {
         for (var x in this.biz()) { }
diff --git a/tests/baselines/reference/forStatementsMultipleInvalidDecl.js b/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
index 82910ff043543..3666ad930a6cc 100644
--- a/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
+++ b/tests/baselines/reference/forStatementsMultipleInvalidDecl.js
@@ -68,8 +68,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/functionImplementationErrors.js b/tests/baselines/reference/functionImplementationErrors.js
index 465ea54b73f5c..433418af41d22 100644
--- a/tests/baselines/reference/functionImplementationErrors.js
+++ b/tests/baselines/reference/functionImplementationErrors.js
@@ -134,16 +134,14 @@ var AnotherClass = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/functionImplementations.js b/tests/baselines/reference/functionImplementations.js
index e26e49c1b7a24..86636b84a87b8 100644
--- a/tests/baselines/reference/functionImplementations.js
+++ b/tests/baselines/reference/functionImplementations.js
@@ -236,8 +236,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -288,8 +287,7 @@ function f6() {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/functionSubtypingOfVarArgs.js b/tests/baselines/reference/functionSubtypingOfVarArgs.js
index c604461f32d1a..55917962184ef 100644
--- a/tests/baselines/reference/functionSubtypingOfVarArgs.js
+++ b/tests/baselines/reference/functionSubtypingOfVarArgs.js
@@ -32,8 +32,7 @@ var EventBase = (function () {
 var StringEvent = (function (_super) {
     __extends(StringEvent, _super);
     function StringEvent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     StringEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/functionSubtypingOfVarArgs2.js b/tests/baselines/reference/functionSubtypingOfVarArgs2.js
index 38a98a3f11496..a676316459f93 100644
--- a/tests/baselines/reference/functionSubtypingOfVarArgs2.js
+++ b/tests/baselines/reference/functionSubtypingOfVarArgs2.js
@@ -32,8 +32,7 @@ var EventBase = (function () {
 var StringEvent = (function (_super) {
     __extends(StringEvent, _super);
     function StringEvent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     StringEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/generatedContextualTyping.js b/tests/baselines/reference/generatedContextualTyping.js
index 5c512883a1064..2a6911d9cf539 100644
--- a/tests/baselines/reference/generatedContextualTyping.js
+++ b/tests/baselines/reference/generatedContextualTyping.js
@@ -369,16 +369,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericBaseClassLiteralProperty.js b/tests/baselines/reference/genericBaseClassLiteralProperty.js
index 25dfb7ae72250..a075eff955014 100644
--- a/tests/baselines/reference/genericBaseClassLiteralProperty.js
+++ b/tests/baselines/reference/genericBaseClassLiteralProperty.js
@@ -26,8 +26,7 @@ var BaseClass = (function () {
 var SubClass = (function (_super) {
     __extends(SubClass, _super);
     function SubClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubClass.prototype.Error = function () {
         var x = this._getValue1();
diff --git a/tests/baselines/reference/genericBaseClassLiteralProperty2.js b/tests/baselines/reference/genericBaseClassLiteralProperty2.js
index e39353b6a7f38..2b562742bf71c 100644
--- a/tests/baselines/reference/genericBaseClassLiteralProperty2.js
+++ b/tests/baselines/reference/genericBaseClassLiteralProperty2.js
@@ -35,8 +35,7 @@ var BaseCollection2 = (function () {
 var DataView2 = (function (_super) {
     __extends(DataView2, _super);
     function DataView2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     DataView2.prototype.fillItems = function (item) {
         this._itemsByKey['dummy'] = item;
diff --git a/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js b/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
index 53c02a85113f0..afef6224ba15b 100644
--- a/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
+++ b/tests/baselines/reference/genericCallWithConstraintsTypeArgumentInference.js
@@ -122,16 +122,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgs2.js b/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
index 3835a4dd78728..7b621b3ffd902 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgs2.js
@@ -46,16 +46,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
index a16f8bcac685e..892cda0ee2d64 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints2.js
@@ -54,8 +54,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
index 410675804af89..addfbc756a8ed 100644
--- a/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
+++ b/tests/baselines/reference/genericCallWithObjectTypeArgsAndConstraints3.js
@@ -52,16 +52,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/genericCallbacksAndClassHierarchy.js b/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
index 3fbb7c8a90117..c2ad2ba29a395 100644
--- a/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
+++ b/tests/baselines/reference/genericCallbacksAndClassHierarchy.js
@@ -46,8 +46,7 @@ var M;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(C1));
diff --git a/tests/baselines/reference/genericClassExpressionInFunction.js b/tests/baselines/reference/genericClassExpressionInFunction.js
index d14b70b631291..dc574dedb0097 100644
--- a/tests/baselines/reference/genericClassExpressionInFunction.js
+++ b/tests/baselines/reference/genericClassExpressionInFunction.js
@@ -47,8 +47,7 @@ function B1() {
     return (function (_super) {
         __extends(class_1, _super);
         function class_1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class_1;
     }(A));
@@ -58,8 +57,7 @@ var B2 = (function () {
         this.anon = (function (_super) {
             __extends(class_2, _super);
             function class_2() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return class_2;
         }(A));
@@ -70,8 +68,7 @@ function B3() {
     return (function (_super) {
         __extends(Inner, _super);
         function Inner() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Inner;
     }(A));
@@ -80,16 +77,14 @@ function B3() {
 var K = (function (_super) {
     __extends(K, _super);
     function K() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return K;
 }(B1()));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }((new B2().anon)));
@@ -97,8 +92,7 @@ var b3Number = B3();
 var S = (function (_super) {
     __extends(S, _super);
     function S() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return S;
 }(b3Number));
diff --git a/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js b/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
index a6c14b9ba0f65..1f3a6e17f1410 100644
--- a/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
+++ b/tests/baselines/reference/genericClassInheritsConstructorFromNonGenericClass.js
@@ -14,16 +14,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(B));
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(C));
diff --git a/tests/baselines/reference/genericClassStaticMethod.js b/tests/baselines/reference/genericClassStaticMethod.js
index 2124f41417265..4609e3bc9db45 100644
--- a/tests/baselines/reference/genericClassStaticMethod.js
+++ b/tests/baselines/reference/genericClassStaticMethod.js
@@ -26,8 +26,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Bar.getFoo = function () {
     };
diff --git a/tests/baselines/reference/genericClasses3.js b/tests/baselines/reference/genericClasses3.js
index 6f10b979c4a14..5371e2479aad0 100644
--- a/tests/baselines/reference/genericClasses3.js
+++ b/tests/baselines/reference/genericClasses3.js
@@ -31,8 +31,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
index 454bc77ae5b42..1b455073196dd 100644
--- a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
+++ b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase.js
@@ -26,8 +26,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
index 26749718d4366..0abd655e1daaa 100644
--- a/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
+++ b/tests/baselines/reference/genericDerivedTypeWithSpecializedBase2.js
@@ -26,8 +26,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericInheritedDefaultConstructors.js b/tests/baselines/reference/genericInheritedDefaultConstructors.js
index e7c32cbe73ff7..059a3213b7aa0 100644
--- a/tests/baselines/reference/genericInheritedDefaultConstructors.js
+++ b/tests/baselines/reference/genericInheritedDefaultConstructors.js
@@ -24,8 +24,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/genericPrototypeProperty2.js b/tests/baselines/reference/genericPrototypeProperty2.js
index ccaf6fa88076d..eac025cce9ba9 100644
--- a/tests/baselines/reference/genericPrototypeProperty2.js
+++ b/tests/baselines/reference/genericPrototypeProperty2.js
@@ -29,8 +29,7 @@ var BaseEvent = (function () {
 var MyEvent = (function (_super) {
     __extends(MyEvent, _super);
     function MyEvent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyEvent;
 }(BaseEvent));
@@ -42,8 +41,7 @@ var BaseEventWrapper = (function () {
 var MyEventWrapper = (function (_super) {
     __extends(MyEventWrapper, _super);
     function MyEventWrapper() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyEventWrapper;
 }(BaseEventWrapper));
diff --git a/tests/baselines/reference/genericPrototypeProperty3.js b/tests/baselines/reference/genericPrototypeProperty3.js
index 8565859370503..9e3ede0019d03 100644
--- a/tests/baselines/reference/genericPrototypeProperty3.js
+++ b/tests/baselines/reference/genericPrototypeProperty3.js
@@ -28,8 +28,7 @@ var BaseEvent = (function () {
 var MyEvent = (function (_super) {
     __extends(MyEvent, _super);
     function MyEvent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyEvent;
 }(BaseEvent));
@@ -41,8 +40,7 @@ var BaseEventWrapper = (function () {
 var MyEventWrapper = (function (_super) {
     __extends(MyEventWrapper, _super);
     function MyEventWrapper() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyEventWrapper;
 }(BaseEventWrapper));
diff --git a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
index e567e2a8042be..6d65ee5531b6d 100644
--- a/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
+++ b/tests/baselines/reference/genericRecursiveImplicitConstructorErrors2.js
@@ -57,8 +57,7 @@ var TypeScript2;
     var PullTypeSymbol = (function (_super) {
         __extends(PullTypeSymbol, _super);
         function PullTypeSymbol() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return PullTypeSymbol;
     }(PullSymbol));
diff --git a/tests/baselines/reference/genericTypeAssertions2.js b/tests/baselines/reference/genericTypeAssertions2.js
index 31d2b3976db6d..687d593f01e12 100644
--- a/tests/baselines/reference/genericTypeAssertions2.js
+++ b/tests/baselines/reference/genericTypeAssertions2.js
@@ -28,8 +28,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () {
         return null;
diff --git a/tests/baselines/reference/genericTypeAssertions4.js b/tests/baselines/reference/genericTypeAssertions4.js
index 41a187edb6a12..50dbe5debbd9a 100644
--- a/tests/baselines/reference/genericTypeAssertions4.js
+++ b/tests/baselines/reference/genericTypeAssertions4.js
@@ -40,8 +40,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () { return 1; };
     return B;
@@ -49,8 +48,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.baz = function () { return 1; };
     return C;
diff --git a/tests/baselines/reference/genericTypeAssertions6.js b/tests/baselines/reference/genericTypeAssertions6.js
index b776668f2e2e7..7bbd7351f1dd4 100644
--- a/tests/baselines/reference/genericTypeAssertions6.js
+++ b/tests/baselines/reference/genericTypeAssertions6.js
@@ -44,8 +44,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.g = function (x) {
         var a = x;
diff --git a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
index 39468204a5af1..cf19feede3436 100644
--- a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
+++ b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument.js
@@ -60,8 +60,7 @@ var g = function f(x) { var y; return y; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -77,8 +76,7 @@ var M;
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(M.E));
diff --git a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
index a41d459b445c4..973ee23176282 100644
--- a/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
+++ b/tests/baselines/reference/genericTypeReferenceWithoutTypeArgument2.js
@@ -55,16 +55,14 @@ var g = function f(x) { var y; return y; };
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(I));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(M.C));
diff --git a/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js b/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
index c0498b351e13b..d6fb98b67cae0 100644
--- a/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
+++ b/tests/baselines/reference/genericWithIndexerOfTypeParameterType2.js
@@ -31,8 +31,7 @@ define(["require", "exports"], function (require, exports) {
     var List = (function (_super) {
         __extends(List, _super);
         function List() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         List.prototype.Bar = function () { };
         return List;
@@ -47,8 +46,7 @@ define(["require", "exports"], function (require, exports) {
     var ListItem = (function (_super) {
         __extends(ListItem, _super);
         function ListItem() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return ListItem;
     }(CollectionItem));
diff --git a/tests/baselines/reference/heterogeneousArrayLiterals.js b/tests/baselines/reference/heterogeneousArrayLiterals.js
index e3c50cfa8f7e8..60a8976722d7f 100644
--- a/tests/baselines/reference/heterogeneousArrayLiterals.js
+++ b/tests/baselines/reference/heterogeneousArrayLiterals.js
@@ -160,16 +160,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/ifDoWhileStatements.js b/tests/baselines/reference/ifDoWhileStatements.js
index af1e3be18ff26..483370bee5c5c 100644
--- a/tests/baselines/reference/ifDoWhileStatements.js
+++ b/tests/baselines/reference/ifDoWhileStatements.js
@@ -177,8 +177,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/implementClausePrecedingExtends.js b/tests/baselines/reference/implementClausePrecedingExtends.js
index 0dfc867a2f77d..df725cde43a08 100644
--- a/tests/baselines/reference/implementClausePrecedingExtends.js
+++ b/tests/baselines/reference/implementClausePrecedingExtends.js
@@ -16,8 +16,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
index 033d615019407..a5a5e02c15675 100644
--- a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
+++ b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithPrivates2.js
@@ -99,24 +99,21 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar;
 }(Foo));
 var Bar2 = (function (_super) {
     __extends(Bar2, _super);
     function Bar2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar2;
 }(Foo));
 var Bar3 = (function (_super) {
     __extends(Bar3, _super);
     function Bar3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar3;
 }(Foo));
@@ -131,32 +128,28 @@ var M;
     var Baz = (function (_super) {
         __extends(Baz, _super);
         function Baz() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Baz;
     }(Foo));
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar;
     }(Foo));
     var Bar2 = (function (_super) {
         __extends(Bar2, _super);
         function Bar2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar2;
     }(Foo));
     var Bar3 = (function (_super) {
         __extends(Bar3, _super);
         function Bar3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar3;
     }(Foo));
@@ -172,16 +165,14 @@ var M2;
     var Baz = (function (_super) {
         __extends(Baz, _super);
         function Baz() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Baz;
     }(Foo));
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar;
     }(Foo));
@@ -192,16 +183,14 @@ var M2;
     var Bar2 = (function (_super) {
         __extends(Bar2, _super);
         function Bar2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar2;
     }(Foo));
     var Bar3 = (function (_super) {
         __extends(Bar3, _super);
         function Bar3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar3;
     }(Foo));
diff --git a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
index 78cfb6b51b94e..d0f7484714164 100644
--- a/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
+++ b/tests/baselines/reference/implementingAnInterfaceExtendingClassWithProtecteds.js
@@ -75,32 +75,28 @@ var Bar4 = (function () {
 var Bar5 = (function (_super) {
     __extends(Bar5, _super);
     function Bar5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar5;
 }(Foo));
 var Bar6 = (function (_super) {
     __extends(Bar6, _super);
     function Bar6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar6;
 }(Foo));
 var Bar7 = (function (_super) {
     __extends(Bar7, _super);
     function Bar7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar7;
 }(Foo));
 var Bar8 = (function (_super) {
     __extends(Bar8, _super);
     function Bar8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar8;
 }(Foo));
diff --git a/tests/baselines/reference/importAsBaseClass.js b/tests/baselines/reference/importAsBaseClass.js
index d9f40f83051d6..b4f45cac8067a 100644
--- a/tests/baselines/reference/importAsBaseClass.js
+++ b/tests/baselines/reference/importAsBaseClass.js
@@ -30,8 +30,7 @@ var Greeter = require("./importAsBaseClass_0");
 var Hello = (function (_super) {
     __extends(Hello, _super);
     function Hello() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Hello;
 }(Greeter));
diff --git a/tests/baselines/reference/importHelpers.js b/tests/baselines/reference/importHelpers.js
index 6641ef9d212f2..ae4d312701024 100644
--- a/tests/baselines/reference/importHelpers.js
+++ b/tests/baselines/reference/importHelpers.js
@@ -45,8 +45,7 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -94,8 +93,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersAmd.js b/tests/baselines/reference/importHelpersAmd.js
index 89fab70bdba62..fea93840fa92c 100644
--- a/tests/baselines/reference/importHelpersAmd.js
+++ b/tests/baselines/reference/importHelpersAmd.js
@@ -32,8 +32,7 @@ define(["require", "exports", "tslib", "./a"], function (require, exports, tslib
     var B = (function (_super) {
         tslib_1.__extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/importHelpersInIsolatedModules.js b/tests/baselines/reference/importHelpersInIsolatedModules.js
index 2a97d3d2d872e..28c00f975544c 100644
--- a/tests/baselines/reference/importHelpersInIsolatedModules.js
+++ b/tests/baselines/reference/importHelpersInIsolatedModules.js
@@ -45,8 +45,7 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -79,8 +78,7 @@ var A = (function () {
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersNoHelpers.js b/tests/baselines/reference/importHelpersNoHelpers.js
index d5f8db60f9766..e22d1f4353d71 100644
--- a/tests/baselines/reference/importHelpersNoHelpers.js
+++ b/tests/baselines/reference/importHelpersNoHelpers.js
@@ -39,8 +39,7 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -88,8 +87,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersNoModule.js b/tests/baselines/reference/importHelpersNoModule.js
index 5891922f9f296..41df9710f3325 100644
--- a/tests/baselines/reference/importHelpersNoModule.js
+++ b/tests/baselines/reference/importHelpersNoModule.js
@@ -37,8 +37,7 @@ exports.A = A;
 var B = (function (_super) {
     tslib_1.__extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -86,8 +85,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/importHelpersOutFile.js b/tests/baselines/reference/importHelpersOutFile.js
index b4c2040aa7137..a45f6285782cd 100644
--- a/tests/baselines/reference/importHelpersOutFile.js
+++ b/tests/baselines/reference/importHelpersOutFile.js
@@ -35,8 +35,7 @@ define("b", ["require", "exports", "tslib", "a"], function (require, exports, ts
     var B = (function (_super) {
         tslib_1.__extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(a_1.A));
@@ -47,8 +46,7 @@ define("c", ["require", "exports", "tslib", "a"], function (require, exports, ts
     var C = (function (_super) {
         tslib_2.__extends(C, _super);
         function C() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C;
     }(a_2.A));
diff --git a/tests/baselines/reference/importHelpersSystem.js b/tests/baselines/reference/importHelpersSystem.js
index 552bd0ed4046b..20f2d299c5254 100644
--- a/tests/baselines/reference/importHelpersSystem.js
+++ b/tests/baselines/reference/importHelpersSystem.js
@@ -51,8 +51,7 @@ System.register(["tslib", "./a"], function (exports_1, context_1) {
             B = (function (_super) {
                 tslib_1.__extends(B, _super);
                 function B() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return B;
             }(a_1.A));
diff --git a/tests/baselines/reference/importShadowsGlobalName.js b/tests/baselines/reference/importShadowsGlobalName.js
index b4950b039f3e3..34cc0604e7ae9 100644
--- a/tests/baselines/reference/importShadowsGlobalName.js
+++ b/tests/baselines/reference/importShadowsGlobalName.js
@@ -31,8 +31,7 @@ define(["require", "exports", "Foo"], function (require, exports, Error) {
     var Bar = (function (_super) {
         __extends(Bar, _super);
         function Bar() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Bar;
     }(Error));
diff --git a/tests/baselines/reference/importUsedInExtendsList1.js b/tests/baselines/reference/importUsedInExtendsList1.js
index 956e20a104520..a40c3a51a782b 100644
--- a/tests/baselines/reference/importUsedInExtendsList1.js
+++ b/tests/baselines/reference/importUsedInExtendsList1.js
@@ -31,8 +31,7 @@ var foo = require("./importUsedInExtendsList1_require");
 var Sub = (function (_super) {
     __extends(Sub, _super);
     function Sub() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Sub;
 }(foo.Super));
diff --git a/tests/baselines/reference/indexerConstraints2.js b/tests/baselines/reference/indexerConstraints2.js
index c8b910abb2dcd..d7357f021d0ed 100644
--- a/tests/baselines/reference/indexerConstraints2.js
+++ b/tests/baselines/reference/indexerConstraints2.js
@@ -42,8 +42,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -56,8 +55,7 @@ var F = (function () {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return G;
 }(F));
@@ -70,8 +68,7 @@ var H = (function () {
 var I = (function (_super) {
     __extends(I, _super);
     function I() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return I;
 }(H));
@@ -84,8 +81,7 @@ var J = (function () {
 var K = (function (_super) {
     __extends(K, _super);
     function K() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return K;
 }(J));
diff --git a/tests/baselines/reference/indirectSelfReference.js b/tests/baselines/reference/indirectSelfReference.js
index c1c77ec5fc97e..2f4f37b9b53a5 100644
--- a/tests/baselines/reference/indirectSelfReference.js
+++ b/tests/baselines/reference/indirectSelfReference.js
@@ -11,16 +11,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var a = (function (_super) {
     __extends(a, _super);
     function a() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return a;
 }(b));
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/indirectSelfReferenceGeneric.js b/tests/baselines/reference/indirectSelfReferenceGeneric.js
index 366ad1f0af54d..9171bb0eeb6ee 100644
--- a/tests/baselines/reference/indirectSelfReferenceGeneric.js
+++ b/tests/baselines/reference/indirectSelfReferenceGeneric.js
@@ -11,16 +11,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var a = (function (_super) {
     __extends(a, _super);
     function a() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return a;
 }(b));
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js b/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
index 9b145b55d0401..ad1a063bfb0fd 100644
--- a/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
+++ b/tests/baselines/reference/infinitelyExpandingTypesNonGenericBase.js
@@ -43,8 +43,7 @@ var Base = (function () {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(Base));
diff --git a/tests/baselines/reference/inheritFromGenericTypeParameter.js b/tests/baselines/reference/inheritFromGenericTypeParameter.js
index 5db269f7c58e2..40e6abd3e5366 100644
--- a/tests/baselines/reference/inheritFromGenericTypeParameter.js
+++ b/tests/baselines/reference/inheritFromGenericTypeParameter.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(T));
diff --git a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
index 7f3e872245bb3..a0874eb1c723f 100644
--- a/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
+++ b/tests/baselines/reference/inheritSameNamePrivatePropertiesFromSameOrigin.js
@@ -24,16 +24,14 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(B));
diff --git a/tests/baselines/reference/inheritance.js b/tests/baselines/reference/inheritance.js
index c4acea2226021..cbfef2d3382a4 100644
--- a/tests/baselines/reference/inheritance.js
+++ b/tests/baselines/reference/inheritance.js
@@ -53,16 +53,14 @@ var B2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(B2));
@@ -74,8 +72,7 @@ var N = (function () {
 var ND = (function (_super) {
     __extends(ND, _super);
     function ND() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ND;
 }(N));
@@ -89,8 +86,7 @@ var Good = (function () {
 var Baad = (function (_super) {
     __extends(Baad, _super);
     function Baad() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Baad.prototype.f = function () { return 0; };
     Baad.prototype.g = function (n) { return 0; };
diff --git a/tests/baselines/reference/inheritance1.js b/tests/baselines/reference/inheritance1.js
index f555d5bf69464..86de0b7635066 100644
--- a/tests/baselines/reference/inheritance1.js
+++ b/tests/baselines/reference/inheritance1.js
@@ -75,8 +75,7 @@ var Control = (function () {
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Button.prototype.select = function () { };
     return Button;
@@ -84,8 +83,7 @@ var Button = (function (_super) {
 var TextBox = (function (_super) {
     __extends(TextBox, _super);
     function TextBox() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     TextBox.prototype.select = function () { };
     return TextBox;
@@ -93,16 +91,14 @@ var TextBox = (function (_super) {
 var ImageBase = (function (_super) {
     __extends(ImageBase, _super);
     function ImageBase() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ImageBase;
 }(Control));
 var Image1 = (function (_super) {
     __extends(Image1, _super);
     function Image1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Image1;
 }(Control));
diff --git a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
index 2ed366d7b8ac6..57a9c89758357 100644
--- a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
+++ b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollision.js
@@ -25,16 +25,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
index 369c6b20a14d8..83c5aa3e4cdfc 100644
--- a/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
+++ b/tests/baselines/reference/inheritanceGrandParentPrivateMemberCollisionWithPublicMember.js
@@ -25,16 +25,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js b/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
index d884364d95c74..b11b6e318a7cb 100644
--- a/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
+++ b/tests/baselines/reference/inheritanceGrandParentPublicMemberCollisionWithPrivateMember.js
@@ -25,16 +25,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.myMethod = function () { };
     return C;
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
index c1289f99a78e6..09ea08899d9dd 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingAccessor.js
@@ -40,8 +40,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
index 665b547154dbc..59d2abdaab2b5 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingMethod.js
@@ -31,8 +31,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js b/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
index a9a92003542f3..98a95747a8e8b 100644
--- a/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberAccessorOverridingProperty.js
@@ -26,8 +26,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b.prototype, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
index 17541ee163da1..0d54e5d42fab9 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingAccessor.js
@@ -37,8 +37,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js b/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
index a154d0426a974..9af25c6fdb807 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingMethod.js
@@ -28,8 +28,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js b/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
index be10895642e7d..5c77ce081010d 100644
--- a/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberFuncOverridingProperty.js
@@ -23,8 +23,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.prototype.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
index 6895077abda36..82c7a94d17c77 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingAccessor.js
@@ -37,8 +37,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
index 00c1093053bdc..e6929218e6396 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingMethod.js
@@ -26,8 +26,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js b/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
index 6cbb7ae7e8ca4..85764cddc5230 100644
--- a/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceMemberPropertyOverridingProperty.js
@@ -21,8 +21,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js b/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
index 370e27514c183..28fe814450996 100644
--- a/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
+++ b/tests/baselines/reference/inheritanceOfGenericConstructorMethod1.js
@@ -21,8 +21,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js b/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
index a61b6bafabd24..0cc71e168f4a8 100644
--- a/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
+++ b/tests/baselines/reference/inheritanceOfGenericConstructorMethod2.js
@@ -40,8 +40,7 @@ var N;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D1;
     }(M.C1));
@@ -49,8 +48,7 @@ var N;
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D2;
     }(M.C2));
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
index 9f71208e5dbcd..bb91ee5f9ead4 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingAccessor.js
@@ -40,8 +40,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
index 2e0c3dc90d0c1..363852a84bf49 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingMethod.js
@@ -31,8 +31,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js b/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
index 95bf94572b15f..ba8df7a5f0bca 100644
--- a/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticAccessorOverridingProperty.js
@@ -26,8 +26,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(b, "x", {
         get: function () {
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
index 25d75bea5afd2..e464029fba5d9 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessor.js
@@ -37,8 +37,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
index 5c39c10e73854..cc825cfa9b5e8 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingAccessorOfFuncType.js
@@ -32,8 +32,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js b/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
index c37caf8d53c93..466c65fa7d5b1 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingMethod.js
@@ -28,8 +28,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js b/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
index eb185d56d0bc3..dfc0ce2c13fcd 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingProperty.js
@@ -23,8 +23,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js b/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
index 0779cc10d3759..da7850f2071fd 100644
--- a/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
+++ b/tests/baselines/reference/inheritanceStaticFuncOverridingPropertyOfFuncType.js
@@ -23,8 +23,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return "20";
diff --git a/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js b/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
index 4934947233f05..d5916a9d452c1 100644
--- a/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
+++ b/tests/baselines/reference/inheritanceStaticFunctionOverridingInstanceProperty.js
@@ -23,8 +23,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     b.x = function () {
         return new b().x;
diff --git a/tests/baselines/reference/inheritanceStaticMembersCompatible.js b/tests/baselines/reference/inheritanceStaticMembersCompatible.js
index 27a65d513fd80..b4cae99b64be9 100644
--- a/tests/baselines/reference/inheritanceStaticMembersCompatible.js
+++ b/tests/baselines/reference/inheritanceStaticMembersCompatible.js
@@ -21,8 +21,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticMembersIncompatible.js b/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
index 7cfafdf1f9d65..38c637dd8d1b0 100644
--- a/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
+++ b/tests/baselines/reference/inheritanceStaticMembersIncompatible.js
@@ -21,8 +21,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
index 1840a7829e8d6..49dc86fc50036 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingAccessor.js
@@ -36,8 +36,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
index 8e498273b86cb..bcd63537540d8 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingMethod.js
@@ -26,8 +26,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js b/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
index c003eaa60b4e8..c1bdd9b66a234 100644
--- a/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
+++ b/tests/baselines/reference/inheritanceStaticPropertyOverridingProperty.js
@@ -21,8 +21,7 @@ var a = (function () {
 var b = (function (_super) {
     __extends(b, _super);
     function b() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return b;
 }(a));
diff --git a/tests/baselines/reference/inheritedConstructorWithRestParams.js b/tests/baselines/reference/inheritedConstructorWithRestParams.js
index ca6a379816fc2..c9db175667637 100644
--- a/tests/baselines/reference/inheritedConstructorWithRestParams.js
+++ b/tests/baselines/reference/inheritedConstructorWithRestParams.js
@@ -32,8 +32,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/inheritedConstructorWithRestParams2.js b/tests/baselines/reference/inheritedConstructorWithRestParams2.js
index b323aefbd4839..9a1b13a84348c 100644
--- a/tests/baselines/reference/inheritedConstructorWithRestParams2.js
+++ b/tests/baselines/reference/inheritedConstructorWithRestParams2.js
@@ -53,16 +53,14 @@ var BaseBase2 = (function () {
 var Base = (function (_super) {
     __extends(Base, _super);
     function Base() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Base;
 }(BaseBase));
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/inheritedModuleMembersForClodule.js b/tests/baselines/reference/inheritedModuleMembersForClodule.js
index 1de6f5f638aee..7ba382e8c470b 100644
--- a/tests/baselines/reference/inheritedModuleMembersForClodule.js
+++ b/tests/baselines/reference/inheritedModuleMembersForClodule.js
@@ -38,8 +38,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -54,8 +53,7 @@ var D;
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.bar = function () {
         return this.foo();
diff --git a/tests/baselines/reference/instanceOfAssignability.js b/tests/baselines/reference/instanceOfAssignability.js
index f78378f0885a2..b8f39c5b0e21a 100644
--- a/tests/baselines/reference/instanceOfAssignability.js
+++ b/tests/baselines/reference/instanceOfAssignability.js
@@ -115,16 +115,14 @@ var Animal = (function () {
 var Mammal = (function (_super) {
     __extends(Mammal, _super);
     function Mammal() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Mammal;
 }(Animal));
 var Giraffe = (function (_super) {
     __extends(Giraffe, _super);
     function Giraffe() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Giraffe;
 }(Mammal));
diff --git a/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js b/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
index cf056e768d837..8dc5227685f76 100644
--- a/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
+++ b/tests/baselines/reference/instancePropertiesInheritedIntoClassType.js
@@ -69,8 +69,7 @@ var NonGeneric;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
@@ -102,8 +101,7 @@ var Generic;
     var D = (function (_super) {
         __extends(D, _super);
         function D() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D;
     }(C));
diff --git a/tests/baselines/reference/instanceSubtypeCheck2.js b/tests/baselines/reference/instanceSubtypeCheck2.js
index e70dc7b64811f..914f37960012e 100644
--- a/tests/baselines/reference/instanceSubtypeCheck2.js
+++ b/tests/baselines/reference/instanceSubtypeCheck2.js
@@ -21,8 +21,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js b/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
index de2789caa68a8..54a574238e562 100644
--- a/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
+++ b/tests/baselines/reference/instanceofWithStructurallyIdenticalTypes.js
@@ -128,8 +128,7 @@ var A = (function () {
 var A1 = (function (_super) {
     __extends(A1, _super);
     function A1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A1;
 }(A));
@@ -141,8 +140,7 @@ var A2 = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/instantiatedReturnTypeContravariance.js b/tests/baselines/reference/instantiatedReturnTypeContravariance.js
index 83ad38e64f034..bc496a63632d3 100644
--- a/tests/baselines/reference/instantiatedReturnTypeContravariance.js
+++ b/tests/baselines/reference/instantiatedReturnTypeContravariance.js
@@ -47,8 +47,7 @@ var c = (function () {
 var d = (function (_super) {
     __extends(d, _super);
     function d() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     d.prototype.foo = function () {
         return null;
diff --git a/tests/baselines/reference/interfaceClassMerging.js b/tests/baselines/reference/interfaceClassMerging.js
index 6111e7f8cee77..6542376a19bde 100644
--- a/tests/baselines/reference/interfaceClassMerging.js
+++ b/tests/baselines/reference/interfaceClassMerging.js
@@ -57,8 +57,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Bar.prototype.method = function (a) {
         return this.optionalProperty;
diff --git a/tests/baselines/reference/interfaceClassMerging2.js b/tests/baselines/reference/interfaceClassMerging2.js
index 499bd21990543..70a62da4131ed 100644
--- a/tests/baselines/reference/interfaceClassMerging2.js
+++ b/tests/baselines/reference/interfaceClassMerging2.js
@@ -53,8 +53,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Bar.prototype.classBarMethod = function () {
         return this;
diff --git a/tests/baselines/reference/interfaceExtendsClass1.js b/tests/baselines/reference/interfaceExtendsClass1.js
index 70ceaa8acd3bf..8324a001f9146 100644
--- a/tests/baselines/reference/interfaceExtendsClass1.js
+++ b/tests/baselines/reference/interfaceExtendsClass1.js
@@ -32,8 +32,7 @@ var Control = (function () {
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Button.prototype.select = function () { };
     return Button;
@@ -41,8 +40,7 @@ var Button = (function (_super) {
 var TextBox = (function (_super) {
     __extends(TextBox, _super);
     function TextBox() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     TextBox.prototype.select = function () { };
     return TextBox;
@@ -50,8 +48,7 @@ var TextBox = (function (_super) {
 var Image = (function (_super) {
     __extends(Image, _super);
     function Image() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Image;
 }(Control));
diff --git a/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js b/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
index 5e6695dd20088..1179ff101df0b 100644
--- a/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
+++ b/tests/baselines/reference/interfaceExtendsClassWithPrivate1.js
@@ -43,8 +43,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function (x) { return x; };
     D.prototype.other = function (x) { return x; };
diff --git a/tests/baselines/reference/interfaceImplementation8.js b/tests/baselines/reference/interfaceImplementation8.js
index f3bfa4db6a586..afb5a795264cc 100644
--- a/tests/baselines/reference/interfaceImplementation8.js
+++ b/tests/baselines/reference/interfaceImplementation8.js
@@ -64,24 +64,21 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(C1));
 var C5 = (function (_super) {
     __extends(C5, _super);
     function C5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C5;
 }(C2));
 var C6 = (function (_super) {
     __extends(C6, _super);
     function C6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C6;
 }(C3));
@@ -93,8 +90,7 @@ var C7 = (function () {
 var C8 = (function (_super) {
     __extends(C8, _super);
     function C8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C8;
 }(C7));
diff --git a/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js b/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
index 75bf3f9188442..6e9b09c906f8e 100644
--- a/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
+++ b/tests/baselines/reference/invalidModuleWithStatementsOfEveryKind.js
@@ -95,8 +95,7 @@ var Y;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return BB;
     }(A));
@@ -111,8 +110,7 @@ var Y2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(AA));
@@ -146,8 +144,7 @@ var YY;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return BB;
     }(A));
@@ -162,8 +159,7 @@ var YY2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(AA));
@@ -197,8 +193,7 @@ var YYY;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return BB;
     }(A));
@@ -213,8 +208,7 @@ var YYY2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(AA));
diff --git a/tests/baselines/reference/invalidMultipleVariableDeclarations.js b/tests/baselines/reference/invalidMultipleVariableDeclarations.js
index b4fbd6f369899..340429cc3982c 100644
--- a/tests/baselines/reference/invalidMultipleVariableDeclarations.js
+++ b/tests/baselines/reference/invalidMultipleVariableDeclarations.js
@@ -67,8 +67,7 @@ var C = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C));
diff --git a/tests/baselines/reference/invalidReturnStatements.js b/tests/baselines/reference/invalidReturnStatements.js
index 1409b1c59a8b2..a6b07b7d7bd3a 100644
--- a/tests/baselines/reference/invalidReturnStatements.js
+++ b/tests/baselines/reference/invalidReturnStatements.js
@@ -41,8 +41,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/isolatedModulesImportExportElision.js b/tests/baselines/reference/isolatedModulesImportExportElision.js
index baf2d1de129cb..6f1d38dcbb5bf 100644
--- a/tests/baselines/reference/isolatedModulesImportExportElision.js
+++ b/tests/baselines/reference/isolatedModulesImportExportElision.js
@@ -26,8 +26,7 @@ var ns = require("module");
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(module_2.c2.C));
diff --git a/tests/baselines/reference/jsxViaImport.js b/tests/baselines/reference/jsxViaImport.js
index c149d4e3c3d72..604787af744e6 100644
--- a/tests/baselines/reference/jsxViaImport.js
+++ b/tests/baselines/reference/jsxViaImport.js
@@ -35,8 +35,7 @@ var BaseComponent = require("BaseComponent");
 var TestComponent = (function (_super) {
     __extends(TestComponent, _super);
     function TestComponent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     TestComponent.prototype.render = function () {
         return <BaseComponent />;
diff --git a/tests/baselines/reference/lambdaArgCrash.js b/tests/baselines/reference/lambdaArgCrash.js
index 16653cfb4f3a2..47db7f3ce64c1 100644
--- a/tests/baselines/reference/lambdaArgCrash.js
+++ b/tests/baselines/reference/lambdaArgCrash.js
@@ -56,8 +56,7 @@ var Event = (function () {
 var ItemSetEvent = (function (_super) {
     __extends(ItemSetEvent, _super);
     function ItemSetEvent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     ItemSetEvent.prototype.add = function (listener) {
         _super.prototype.add.call(this, listener);
diff --git a/tests/baselines/reference/localTypes1.js b/tests/baselines/reference/localTypes1.js
index 96c9337817d4d..100452b7a96c0 100644
--- a/tests/baselines/reference/localTypes1.js
+++ b/tests/baselines/reference/localTypes1.js
@@ -300,8 +300,7 @@ function f6() {
         var B = (function (_super) {
             __extends(B, _super);
             function B() {
-                var _this = _super.apply(this, arguments) || this;
-                return _this;
+                return _super.apply(this, arguments) || this;
             }
             return B;
         }(A));
@@ -309,8 +308,7 @@ function f6() {
             var C = (function (_super) {
                 __extends(C, _super);
                 function C() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return C;
             }(B));
diff --git a/tests/baselines/reference/m7Bugs.js b/tests/baselines/reference/m7Bugs.js
index 19cd9ee463030..e5a4d11f00cd8 100644
--- a/tests/baselines/reference/m7Bugs.js
+++ b/tests/baselines/reference/m7Bugs.js
@@ -42,8 +42,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/mergedDeclarations5.js b/tests/baselines/reference/mergedDeclarations5.js
index 53a8c983399f6..b24e86eca5815 100644
--- a/tests/baselines/reference/mergedDeclarations5.js
+++ b/tests/baselines/reference/mergedDeclarations5.js
@@ -27,8 +27,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.foo = function () { };
     return B;
diff --git a/tests/baselines/reference/mergedDeclarations6.js b/tests/baselines/reference/mergedDeclarations6.js
index 50108773a7071..d610e4ab46f3d 100644
--- a/tests/baselines/reference/mergedDeclarations6.js
+++ b/tests/baselines/reference/mergedDeclarations6.js
@@ -47,8 +47,7 @@ define(["require", "exports", "./a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         B.prototype.setProtected = function () {
         };
diff --git a/tests/baselines/reference/mergedInheritedClassInterface.js b/tests/baselines/reference/mergedInheritedClassInterface.js
index fd0bea5494c80..0f598f2cf7858 100644
--- a/tests/baselines/reference/mergedInheritedClassInterface.js
+++ b/tests/baselines/reference/mergedInheritedClassInterface.js
@@ -61,8 +61,7 @@ var BaseClass = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Child.prototype.method = function () { };
     return Child;
@@ -76,8 +75,7 @@ var ChildNoBaseClass = (function () {
 var Grandchild = (function (_super) {
     __extends(Grandchild, _super);
     function Grandchild() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Grandchild;
 }(ChildNoBaseClass));
diff --git a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
index a3baa1920e3fe..6dccf1dfdd9e9 100644
--- a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
+++ b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates2.js
@@ -50,16 +50,14 @@ var C2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(C2));
diff --git a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
index e21ca151c8707..a3ca796575c66 100644
--- a/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
+++ b/tests/baselines/reference/mergedInterfacesWithInheritedPrivates3.js
@@ -57,8 +57,7 @@ var C2 = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/moduleAsBaseType.js b/tests/baselines/reference/moduleAsBaseType.js
index 598ddaef2de0d..fc0533a2470e3 100644
--- a/tests/baselines/reference/moduleAsBaseType.js
+++ b/tests/baselines/reference/moduleAsBaseType.js
@@ -13,8 +13,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(M));
diff --git a/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js b/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
index 2f4ac430cc127..51d9eb89b1d2c 100644
--- a/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
+++ b/tests/baselines/reference/moduleImportedForTypeArgumentPosition.js
@@ -31,8 +31,7 @@ define(["require", "exports"], function (require, exports) {
     var Test1 = (function (_super) {
         __extends(Test1, _super);
         function Test1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Test1;
     }(C1));
diff --git a/tests/baselines/reference/moduleWithStatementsOfEveryKind.js b/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
index 11053d76d2dfe..1558ef742ab14 100644
--- a/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
+++ b/tests/baselines/reference/moduleWithStatementsOfEveryKind.js
@@ -79,16 +79,14 @@ var A;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(AA));
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return BB;
     }(A));
@@ -132,8 +130,7 @@ var Y;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(AA));
@@ -141,8 +138,7 @@ var Y;
     var BB = (function (_super) {
         __extends(BB, _super);
         function BB() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return BB;
     }(A));
diff --git a/tests/baselines/reference/multipleInheritance.js b/tests/baselines/reference/multipleInheritance.js
index 80e9a469398af..9c0e865cdb774 100644
--- a/tests/baselines/reference/multipleInheritance.js
+++ b/tests/baselines/reference/multipleInheritance.js
@@ -57,32 +57,28 @@ var B2 = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B1));
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(B2));
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(D1));
@@ -94,8 +90,7 @@ var N = (function () {
 var ND = (function (_super) {
     __extends(ND, _super);
     function ND() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ND;
 }(N));
@@ -109,8 +104,7 @@ var Good = (function () {
 var Baad = (function (_super) {
     __extends(Baad, _super);
     function Baad() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Baad.prototype.f = function () { return 0; };
     Baad.prototype.g = function (n) { return 0; };
diff --git a/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js b/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
index 7c5ec66c6be58..8b59564d46595 100644
--- a/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
+++ b/tests/baselines/reference/mutuallyRecursiveGenericBaseTypes2.js
@@ -25,8 +25,7 @@ var foo = (function () {
 var foo2 = (function (_super) {
     __extends(foo2, _super);
     function foo2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return foo2;
 }(foo));
diff --git a/tests/baselines/reference/noEmitHelpers.js b/tests/baselines/reference/noEmitHelpers.js
index c3d27cac8a968..fdb7cbab7d4ed 100644
--- a/tests/baselines/reference/noEmitHelpers.js
+++ b/tests/baselines/reference/noEmitHelpers.js
@@ -13,8 +13,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js b/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
index d0e87aba25bf6..cc4c942237329 100644
--- a/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
+++ b/tests/baselines/reference/noImplicitAnyMissingGetAccessor.js
@@ -26,8 +26,7 @@ var Parent = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(Child.prototype, "message", {
         set: function (str) {
diff --git a/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js b/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
index 1b4119227bc5c..1323955c05e7f 100644
--- a/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
+++ b/tests/baselines/reference/noImplicitAnyMissingSetAccessor.js
@@ -25,8 +25,7 @@ var Parent = (function () {
 var Child = (function (_super) {
     __extends(Child, _super);
     function Child() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(Child.prototype, "message", {
         get: function () {
diff --git a/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js b/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
index bbab8e9ccdd6e..b0a3365193d25 100644
--- a/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
+++ b/tests/baselines/reference/nonGenericClassExtendingGenericClassWithAny.js
@@ -19,8 +19,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Bar;
 }(Foo)); // Valid
diff --git a/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js b/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
index 1901e16944749..92c8b380e00af 100644
--- a/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
+++ b/tests/baselines/reference/numericIndexerConstrainsPropertyDeclarations2.js
@@ -61,8 +61,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () { return ''; };
     return B;
diff --git a/tests/baselines/reference/numericIndexerConstraint3.js b/tests/baselines/reference/numericIndexerConstraint3.js
index 97c3e56d42379..29cb75b423469 100644
--- a/tests/baselines/reference/numericIndexerConstraint3.js
+++ b/tests/baselines/reference/numericIndexerConstraint3.js
@@ -26,8 +26,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/numericIndexerConstraint4.js b/tests/baselines/reference/numericIndexerConstraint4.js
index 732f7e2672ce5..135e169c4a9f8 100644
--- a/tests/baselines/reference/numericIndexerConstraint4.js
+++ b/tests/baselines/reference/numericIndexerConstraint4.js
@@ -26,8 +26,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/numericIndexerTyping2.js b/tests/baselines/reference/numericIndexerTyping2.js
index 1d38f844384f1..5b9e797bdecde 100644
--- a/tests/baselines/reference/numericIndexerTyping2.js
+++ b/tests/baselines/reference/numericIndexerTyping2.js
@@ -26,8 +26,7 @@ var I = (function () {
 var I2 = (function (_super) {
     __extends(I2, _super);
     function I2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return I2;
 }(I));
diff --git a/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js b/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
index 76c1890094511..17045d65af0a9 100644
--- a/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
+++ b/tests/baselines/reference/objectTypeHidingMembersOfExtendedObject.js
@@ -68,8 +68,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
index 3df18cb27cb09..e82cef9bdd6f2 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers1.js
@@ -147,16 +147,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
index e7d2f603d5c31..abcea11367078 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers2.js
@@ -140,8 +140,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -163,16 +162,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
index e0b75f54208f9..f5aeb177472f7 100644
--- a/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithNumericIndexers3.js
@@ -147,16 +147,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates.js b/tests/baselines/reference/objectTypesIdentityWithPrivates.js
index 681af407bd402..3946027063f4d 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates.js
@@ -145,16 +145,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates2.js b/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
index 2011b741df2f9..9cae6960a2ea0 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates2.js
@@ -53,8 +53,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/objectTypesIdentityWithPrivates3.js b/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
index 80bdd4c87e1e2..68754a583aa15 100644
--- a/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
+++ b/tests/baselines/reference/objectTypesIdentityWithPrivates3.js
@@ -39,8 +39,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C1));
@@ -54,8 +53,7 @@ var C3 = (function () {
 var C4 = (function (_super) {
     __extends(C4, _super);
     function C4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C4;
 }(C3));
diff --git a/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js b/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
index 3eac80c60fcb4..b0211bbbba741 100644
--- a/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
+++ b/tests/baselines/reference/objectTypesIdentityWithStringIndexers.js
@@ -147,16 +147,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js b/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
index d55ef5eb28c5a..00d7d1e81d84d 100644
--- a/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
+++ b/tests/baselines/reference/objectTypesIdentityWithStringIndexers2.js
@@ -140,8 +140,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -163,16 +162,14 @@ var C = (function () {
 var PA = (function (_super) {
     __extends(PA, _super);
     function PA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PA;
 }(A));
 var PB = (function (_super) {
     __extends(PB, _super);
     function PB() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return PB;
 }(B));
diff --git a/tests/baselines/reference/optionalConstructorArgInSuper.js b/tests/baselines/reference/optionalConstructorArgInSuper.js
index 04056fa9c14d8..e460ab3fb15b3 100644
--- a/tests/baselines/reference/optionalConstructorArgInSuper.js
+++ b/tests/baselines/reference/optionalConstructorArgInSuper.js
@@ -25,8 +25,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
diff --git a/tests/baselines/reference/optionalParamInOverride.js b/tests/baselines/reference/optionalParamInOverride.js
index a8bd88ed3a8b1..1312a89502ad1 100644
--- a/tests/baselines/reference/optionalParamInOverride.js
+++ b/tests/baselines/reference/optionalParamInOverride.js
@@ -22,8 +22,7 @@ var Z = (function () {
 var Y = (function (_super) {
     __extends(Y, _super);
     function Y() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Y.prototype.func = function (value) { };
     return Y;
diff --git a/tests/baselines/reference/outModuleConcatAmd.js b/tests/baselines/reference/outModuleConcatAmd.js
index 5643875efd362..5054c2a3c335e 100644
--- a/tests/baselines/reference/outModuleConcatAmd.js
+++ b/tests/baselines/reference/outModuleConcatAmd.js
@@ -28,8 +28,7 @@ define("b", ["require", "exports", "ref/a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/outModuleConcatAmd.js.map b/tests/baselines/reference/outModuleConcatAmd.js.map
index 25873d9cd0763..e987d5deb8a10 100644
--- a/tests/baselines/reference/outModuleConcatAmd.js.map
+++ b/tests/baselines/reference/outModuleConcatAmd.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;IACA;QAAA;QAAiB,CAAC;QAAD,QAAC;IAAD,CAAC,AAAlB,IAAkB;IAAlB,cAAkB;;;;ICAlB;QAAuB,qBAAC;QAAxB;YAAuB,kDAAC;;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;IACA;QAAA;QAAiB,CAAC;QAAD,QAAC;IAAD,CAAC,AAAlB,IAAkB;IAAlB,cAAkB;;;;ICAlB;QAAuB,qBAAC;QAAxB;;QAA2B,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt b/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
index 2fa35a323a081..1bfda04977630 100644
--- a/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
+++ b/tests/baselines/reference/outModuleConcatAmd.sourcemap.txt
@@ -92,35 +92,27 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>        function B() {
 1 >^^^^^^^^
-2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(19, 9) Source(2, 1) + SourceIndex(1)
 ---
->>>            var _this = _super.apply(this, arguments) || this;
-1->^^^^^^^^^^^^
-2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-1->export class B extends 
-2 >            A
-1->Emitted(20, 13) Source(2, 24) + SourceIndex(1)
-2 >Emitted(20, 63) Source(2, 25) + SourceIndex(1)
----
->>>            return _this;
+>>>            return _super.apply(this, arguments) || this;
 >>>        }
-1 >^^^^^^^^
+1->^^^^^^^^
 2 >        ^
 3 >         ^^^^^^^^^->
-1 > { 
+1->export class B extends A { 
 2 >        }
-1 >Emitted(22, 9) Source(2, 28) + SourceIndex(1)
-2 >Emitted(22, 10) Source(2, 29) + SourceIndex(1)
+1->Emitted(21, 9) Source(2, 28) + SourceIndex(1)
+2 >Emitted(21, 10) Source(2, 29) + SourceIndex(1)
 ---
 >>>        return B;
 1->^^^^^^^^
 2 >        ^^^^^^^^
 1->
 2 >        }
-1->Emitted(23, 9) Source(2, 28) + SourceIndex(1)
-2 >Emitted(23, 17) Source(2, 29) + SourceIndex(1)
+1->Emitted(22, 9) Source(2, 28) + SourceIndex(1)
+2 >Emitted(22, 17) Source(2, 29) + SourceIndex(1)
 ---
 >>>    }(a_1.A));
 1 >^^^^
@@ -136,20 +128,20 @@ sourceFile:tests/cases/compiler/b.ts
 4 >     export class B extends 
 5 >      A
 6 >            { }
-1 >Emitted(24, 5) Source(2, 28) + SourceIndex(1)
-2 >Emitted(24, 6) Source(2, 29) + SourceIndex(1)
-3 >Emitted(24, 6) Source(2, 1) + SourceIndex(1)
-4 >Emitted(24, 7) Source(2, 24) + SourceIndex(1)
-5 >Emitted(24, 12) Source(2, 25) + SourceIndex(1)
-6 >Emitted(24, 15) Source(2, 29) + SourceIndex(1)
+1 >Emitted(23, 5) Source(2, 28) + SourceIndex(1)
+2 >Emitted(23, 6) Source(2, 29) + SourceIndex(1)
+3 >Emitted(23, 6) Source(2, 1) + SourceIndex(1)
+4 >Emitted(23, 7) Source(2, 24) + SourceIndex(1)
+5 >Emitted(23, 12) Source(2, 25) + SourceIndex(1)
+6 >Emitted(23, 15) Source(2, 29) + SourceIndex(1)
 ---
 >>>    exports.B = B;
 1->^^^^
 2 >    ^^^^^^^^^^^^^^
 1->
 2 >    export class B extends A { }
-1->Emitted(25, 5) Source(2, 1) + SourceIndex(1)
-2 >Emitted(25, 19) Source(2, 29) + SourceIndex(1)
+1->Emitted(24, 5) Source(2, 1) + SourceIndex(1)
+2 >Emitted(24, 19) Source(2, 29) + SourceIndex(1)
 ---
 >>>});
 >>>//# sourceMappingURL=all.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatSystem.js b/tests/baselines/reference/outModuleConcatSystem.js
index eecb410195812..a615090f33a50 100644
--- a/tests/baselines/reference/outModuleConcatSystem.js
+++ b/tests/baselines/reference/outModuleConcatSystem.js
@@ -44,8 +44,7 @@ System.register("b", ["ref/a"], function (exports_2, context_2) {
             B = (function (_super) {
                 __extends(B, _super);
                 function B() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return B;
             }(a_1.A));
diff --git a/tests/baselines/reference/outModuleConcatSystem.js.map b/tests/baselines/reference/outModuleConcatSystem.js.map
index f77bed44ffcf6..ac8fb23d87c13 100644
--- a/tests/baselines/reference/outModuleConcatSystem.js.map
+++ b/tests/baselines/reference/outModuleConcatSystem.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;;;;;;YACA;gBAAA;gBAAiB,CAAC;gBAAD,QAAC;YAAD,CAAC,AAAlB,IAAkB;;QAClB,CAAC;;;;;;;;;;;;;;YCDD;gBAAuB,qBAAC;gBAAxB;oBAAuB,kDAAC;;gBAAG,CAAC;gBAAD,QAAC;YAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;;QAAA,CAAC"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;;;;;;;;YACA;gBAAA;gBAAiB,CAAC;gBAAD,QAAC;YAAD,CAAC,AAAlB,IAAkB;;QAClB,CAAC;;;;;;;;;;;;;;YCDD;gBAAuB,qBAAC;gBAAxB;;gBAA2B,CAAC;gBAAD,QAAC;YAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;;QAAA,CAAC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
index 5287a760ac8eb..732214237fa32 100644
--- a/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
+++ b/tests/baselines/reference/outModuleConcatSystem.sourcemap.txt
@@ -109,35 +109,27 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>                function B() {
 1 >^^^^^^^^^^^^^^^^
-2 >                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(35, 17) Source(2, 1) + SourceIndex(1)
 ---
->>>                    var _this = _super.apply(this, arguments) || this;
-1->^^^^^^^^^^^^^^^^^^^^
-2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-1->export class B extends 
-2 >                    A
-1->Emitted(36, 21) Source(2, 24) + SourceIndex(1)
-2 >Emitted(36, 71) Source(2, 25) + SourceIndex(1)
----
->>>                    return _this;
+>>>                    return _super.apply(this, arguments) || this;
 >>>                }
-1 >^^^^^^^^^^^^^^^^
+1->^^^^^^^^^^^^^^^^
 2 >                ^
 3 >                 ^^^^^^^^^->
-1 > { 
+1->export class B extends A { 
 2 >                }
-1 >Emitted(38, 17) Source(2, 28) + SourceIndex(1)
-2 >Emitted(38, 18) Source(2, 29) + SourceIndex(1)
+1->Emitted(37, 17) Source(2, 28) + SourceIndex(1)
+2 >Emitted(37, 18) Source(2, 29) + SourceIndex(1)
 ---
 >>>                return B;
 1->^^^^^^^^^^^^^^^^
 2 >                ^^^^^^^^
 1->
 2 >                }
-1->Emitted(39, 17) Source(2, 28) + SourceIndex(1)
-2 >Emitted(39, 25) Source(2, 29) + SourceIndex(1)
+1->Emitted(38, 17) Source(2, 28) + SourceIndex(1)
+2 >Emitted(38, 25) Source(2, 29) + SourceIndex(1)
 ---
 >>>            }(a_1.A));
 1 >^^^^^^^^^^^^
@@ -153,12 +145,12 @@ sourceFile:tests/cases/compiler/b.ts
 4 >             export class B extends 
 5 >              A
 6 >                    { }
-1 >Emitted(40, 13) Source(2, 28) + SourceIndex(1)
-2 >Emitted(40, 14) Source(2, 29) + SourceIndex(1)
-3 >Emitted(40, 14) Source(2, 1) + SourceIndex(1)
-4 >Emitted(40, 15) Source(2, 24) + SourceIndex(1)
-5 >Emitted(40, 20) Source(2, 25) + SourceIndex(1)
-6 >Emitted(40, 23) Source(2, 29) + SourceIndex(1)
+1 >Emitted(39, 13) Source(2, 28) + SourceIndex(1)
+2 >Emitted(39, 14) Source(2, 29) + SourceIndex(1)
+3 >Emitted(39, 14) Source(2, 1) + SourceIndex(1)
+4 >Emitted(39, 15) Source(2, 24) + SourceIndex(1)
+5 >Emitted(39, 20) Source(2, 25) + SourceIndex(1)
+6 >Emitted(39, 23) Source(2, 29) + SourceIndex(1)
 ---
 >>>            exports_2("B", B);
 >>>        }
@@ -166,8 +158,8 @@ sourceFile:tests/cases/compiler/b.ts
 2 >        ^
 1->
 2 >        
-1->Emitted(42, 9) Source(2, 29) + SourceIndex(1)
-2 >Emitted(42, 10) Source(2, 30) + SourceIndex(1)
+1->Emitted(41, 9) Source(2, 29) + SourceIndex(1)
+2 >Emitted(41, 10) Source(2, 30) + SourceIndex(1)
 ---
 >>>    };
 >>>});
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.js b/tests/baselines/reference/outModuleTripleSlashRefs.js
index ac2f2510b642c..b9ff7c15b61a2 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.js
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.js
@@ -57,8 +57,7 @@ define("b", ["require", "exports", "ref/a"], function (require, exports, a_1) {
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(a_1.A));
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.js.map b/tests/baselines/reference/outModuleTripleSlashRefs.js.map
index 1cdbef49afac2..45d5799045001 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.js.map
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.js.map
@@ -1,2 +1,2 @@
 //// [all.js.map]
-{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/b.ts","tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;AAAA,iCAAiC;AACjC;IAAA;IAEA,CAAC;IAAD,UAAC;AAAD,CAAC,AAFD,IAEC;;;ICFD,+BAA+B;IAC/B;QAAA;QAEA,CAAC;QAAD,QAAC;IAAD,CAAC,AAFD,IAEC;IAFD,cAEC;;;;ICHD;QAAuB,qBAAC;QAAxB;YAAuB,kDAAC;;QAAG,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
+{"version":3,"file":"all.js","sourceRoot":"","sources":["tests/cases/compiler/ref/b.ts","tests/cases/compiler/ref/a.ts","tests/cases/compiler/b.ts"],"names":[],"mappings":";;;;;AAAA,iCAAiC;AACjC;IAAA;IAEA,CAAC;IAAD,UAAC;AAAD,CAAC,AAFD,IAEC;;;ICFD,+BAA+B;IAC/B;QAAA;QAEA,CAAC;QAAD,QAAC;IAAD,CAAC,AAFD,IAEC;IAFD,cAEC;;;;ICHD;QAAuB,qBAAC;QAAxB;;QAA2B,CAAC;QAAD,QAAC;IAAD,CAAC,AAA5B,CAAuB,KAAC,GAAI;IAA5B,cAA4B"}
\ No newline at end of file
diff --git a/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt b/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
index e940429a74bb3..482c898e0cb03 100644
--- a/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
+++ b/tests/baselines/reference/outModuleTripleSlashRefs.sourcemap.txt
@@ -168,35 +168,27 @@ sourceFile:tests/cases/compiler/b.ts
 ---
 >>>        function B() {
 1 >^^^^^^^^
-2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(26, 9) Source(2, 1) + SourceIndex(2)
 ---
->>>            var _this = _super.apply(this, arguments) || this;
-1->^^^^^^^^^^^^
-2 >            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-1->export class B extends 
-2 >            A
-1->Emitted(27, 13) Source(2, 24) + SourceIndex(2)
-2 >Emitted(27, 63) Source(2, 25) + SourceIndex(2)
----
->>>            return _this;
+>>>            return _super.apply(this, arguments) || this;
 >>>        }
-1 >^^^^^^^^
+1->^^^^^^^^
 2 >        ^
 3 >         ^^^^^^^^^->
-1 > { 
+1->export class B extends A { 
 2 >        }
-1 >Emitted(29, 9) Source(2, 28) + SourceIndex(2)
-2 >Emitted(29, 10) Source(2, 29) + SourceIndex(2)
+1->Emitted(28, 9) Source(2, 28) + SourceIndex(2)
+2 >Emitted(28, 10) Source(2, 29) + SourceIndex(2)
 ---
 >>>        return B;
 1->^^^^^^^^
 2 >        ^^^^^^^^
 1->
 2 >        }
-1->Emitted(30, 9) Source(2, 28) + SourceIndex(2)
-2 >Emitted(30, 17) Source(2, 29) + SourceIndex(2)
+1->Emitted(29, 9) Source(2, 28) + SourceIndex(2)
+2 >Emitted(29, 17) Source(2, 29) + SourceIndex(2)
 ---
 >>>    }(a_1.A));
 1 >^^^^
@@ -212,20 +204,20 @@ sourceFile:tests/cases/compiler/b.ts
 4 >     export class B extends 
 5 >      A
 6 >            { }
-1 >Emitted(31, 5) Source(2, 28) + SourceIndex(2)
-2 >Emitted(31, 6) Source(2, 29) + SourceIndex(2)
-3 >Emitted(31, 6) Source(2, 1) + SourceIndex(2)
-4 >Emitted(31, 7) Source(2, 24) + SourceIndex(2)
-5 >Emitted(31, 12) Source(2, 25) + SourceIndex(2)
-6 >Emitted(31, 15) Source(2, 29) + SourceIndex(2)
+1 >Emitted(30, 5) Source(2, 28) + SourceIndex(2)
+2 >Emitted(30, 6) Source(2, 29) + SourceIndex(2)
+3 >Emitted(30, 6) Source(2, 1) + SourceIndex(2)
+4 >Emitted(30, 7) Source(2, 24) + SourceIndex(2)
+5 >Emitted(30, 12) Source(2, 25) + SourceIndex(2)
+6 >Emitted(30, 15) Source(2, 29) + SourceIndex(2)
 ---
 >>>    exports.B = B;
 1->^^^^
 2 >    ^^^^^^^^^^^^^^
 1->
 2 >    export class B extends A { }
-1->Emitted(32, 5) Source(2, 1) + SourceIndex(2)
-2 >Emitted(32, 19) Source(2, 29) + SourceIndex(2)
+1->Emitted(31, 5) Source(2, 1) + SourceIndex(2)
+2 >Emitted(31, 19) Source(2, 29) + SourceIndex(2)
 ---
 >>>});
 >>>//# sourceMappingURL=all.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/overload1.js b/tests/baselines/reference/overload1.js
index d83c8aea7add5..41aafdfb29c2d 100644
--- a/tests/baselines/reference/overload1.js
+++ b/tests/baselines/reference/overload1.js
@@ -56,8 +56,7 @@ var O;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
@@ -65,8 +64,7 @@ var O;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C;
     }(B));
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks1.js b/tests/baselines/reference/overloadOnConstConstraintChecks1.js
index ad49f8e9d7af3..f9d1c81b06b99 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks1.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks1.js
@@ -37,8 +37,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -46,8 +45,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -55,8 +53,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks2.js b/tests/baselines/reference/overloadOnConstConstraintChecks2.js
index 2b521b4baf5cb..a680a62ddfef6 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks2.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks2.js
@@ -25,16 +25,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks3.js b/tests/baselines/reference/overloadOnConstConstraintChecks3.js
index df5e0065adb90..025e449fd6f69 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks3.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks3.js
@@ -27,16 +27,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstConstraintChecks4.js b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
index 49d96b97b74c2..0f436a5f0b2c9 100644
--- a/tests/baselines/reference/overloadOnConstConstraintChecks4.js
+++ b/tests/baselines/reference/overloadOnConstConstraintChecks4.js
@@ -36,16 +36,14 @@ var A = (function (_super) {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.foo = function () { };
     return C;
diff --git a/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js b/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
index 5d0546d0edc56..e3f58c0f7d0d2 100644
--- a/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
+++ b/tests/baselines/reference/overloadOnConstantsInvalidOverload1.js
@@ -26,8 +26,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -35,8 +34,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -44,8 +42,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadResolution.js b/tests/baselines/reference/overloadResolution.js
index c34d037b350ca..e5cc35c39c4cb 100644
--- a/tests/baselines/reference/overloadResolution.js
+++ b/tests/baselines/reference/overloadResolution.js
@@ -108,24 +108,21 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadResolutionClassConstructors.js b/tests/baselines/reference/overloadResolutionClassConstructors.js
index 0a899584c182e..7c8b2e2ccb6ed 100644
--- a/tests/baselines/reference/overloadResolutionClassConstructors.js
+++ b/tests/baselines/reference/overloadResolutionClassConstructors.js
@@ -115,24 +115,21 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadResolutionConstructors.js b/tests/baselines/reference/overloadResolutionConstructors.js
index 42dceff061e6b..44bbfbcec2b51 100644
--- a/tests/baselines/reference/overloadResolutionConstructors.js
+++ b/tests/baselines/reference/overloadResolutionConstructors.js
@@ -116,24 +116,21 @@ var SomeBase = (function () {
 var SomeDerived1 = (function (_super) {
     __extends(SomeDerived1, _super);
     function SomeDerived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived1;
 }(SomeBase));
 var SomeDerived2 = (function (_super) {
     __extends(SomeDerived2, _super);
     function SomeDerived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived2;
 }(SomeBase));
 var SomeDerived3 = (function (_super) {
     __extends(SomeDerived3, _super);
     function SomeDerived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived3;
 }(SomeBase));
diff --git a/tests/baselines/reference/overloadingOnConstants1.js b/tests/baselines/reference/overloadingOnConstants1.js
index 52d8a1b7abe3a..96f4f7baf2442 100644
--- a/tests/baselines/reference/overloadingOnConstants1.js
+++ b/tests/baselines/reference/overloadingOnConstants1.js
@@ -40,8 +40,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
@@ -49,8 +48,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.baz = function () { };
     return Derived2;
@@ -58,8 +56,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.biz = function () { };
     return Derived3;
diff --git a/tests/baselines/reference/overloadingOnConstants2.js b/tests/baselines/reference/overloadingOnConstants2.js
index 85976ae7fcdf0..0c34d0f4b7694 100644
--- a/tests/baselines/reference/overloadingOnConstants2.js
+++ b/tests/baselines/reference/overloadingOnConstants2.js
@@ -42,8 +42,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/overridingPrivateStaticMembers.js b/tests/baselines/reference/overridingPrivateStaticMembers.js
index b7ad5b665546a..ca5616450baea 100644
--- a/tests/baselines/reference/overridingPrivateStaticMembers.js
+++ b/tests/baselines/reference/overridingPrivateStaticMembers.js
@@ -21,8 +21,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/parseErrorInHeritageClause1.js b/tests/baselines/reference/parseErrorInHeritageClause1.js
index 0a29bdf2da0a4..a9ca0a6db7342 100644
--- a/tests/baselines/reference/parseErrorInHeritageClause1.js
+++ b/tests/baselines/reference/parseErrorInHeritageClause1.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parser509630.js b/tests/baselines/reference/parser509630.js
index cdef63aa80f46..d3648dc5b6457 100644
--- a/tests/baselines/reference/parser509630.js
+++ b/tests/baselines/reference/parser509630.js
@@ -21,8 +21,7 @@ var Type = (function () {
 var Any = (function (_super) {
     __extends(Any, _super);
     function Any() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Any;
 }(Type));
diff --git a/tests/baselines/reference/parserAstSpans1.js b/tests/baselines/reference/parserAstSpans1.js
index c7bdb90775e19..6b86353b959d4 100644
--- a/tests/baselines/reference/parserAstSpans1.js
+++ b/tests/baselines/reference/parserAstSpans1.js
@@ -363,8 +363,7 @@ c2_i.nc_f1();
 var c4 = (function (_super) {
     __extends(c4, _super);
     function c4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return c4;
 }(c2));
diff --git a/tests/baselines/reference/parserClassDeclaration1.js b/tests/baselines/reference/parserClassDeclaration1.js
index f91efad621e1f..a61b492b7a935 100644
--- a/tests/baselines/reference/parserClassDeclaration1.js
+++ b/tests/baselines/reference/parserClassDeclaration1.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration3.js b/tests/baselines/reference/parserClassDeclaration3.js
index 9d51b0ed25e18..f58f0ab00cb96 100644
--- a/tests/baselines/reference/parserClassDeclaration3.js
+++ b/tests/baselines/reference/parserClassDeclaration3.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(B));
diff --git a/tests/baselines/reference/parserClassDeclaration4.js b/tests/baselines/reference/parserClassDeclaration4.js
index 7c91281d05cac..912aa8c658198 100644
--- a/tests/baselines/reference/parserClassDeclaration4.js
+++ b/tests/baselines/reference/parserClassDeclaration4.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration5.js b/tests/baselines/reference/parserClassDeclaration5.js
index aeb7ce0919054..054aaf0eb7a49 100644
--- a/tests/baselines/reference/parserClassDeclaration5.js
+++ b/tests/baselines/reference/parserClassDeclaration5.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserClassDeclaration6.js b/tests/baselines/reference/parserClassDeclaration6.js
index b14257310c4ec..1423edfe037ad 100644
--- a/tests/baselines/reference/parserClassDeclaration6.js
+++ b/tests/baselines/reference/parserClassDeclaration6.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
index c4a2fd297114b..aa0679bb8f5af 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause2.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
index ae9d5068e294d..1308c7c194bff 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause4.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
index 8992706cd169b..b1471628fbd9b 100644
--- a/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
+++ b/tests/baselines/reference/parserErrorRecovery_ExtendsOrImplementsClause5.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserGenericsInTypeContexts1.js b/tests/baselines/reference/parserGenericsInTypeContexts1.js
index 0ec560c130625..641d296dc4359 100644
--- a/tests/baselines/reference/parserGenericsInTypeContexts1.js
+++ b/tests/baselines/reference/parserGenericsInTypeContexts1.js
@@ -26,8 +26,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/parserGenericsInTypeContexts2.js b/tests/baselines/reference/parserGenericsInTypeContexts2.js
index d4c754fb0b154..b0f14a090ae5f 100644
--- a/tests/baselines/reference/parserGenericsInTypeContexts2.js
+++ b/tests/baselines/reference/parserGenericsInTypeContexts2.js
@@ -26,8 +26,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/primitiveMembers.js b/tests/baselines/reference/primitiveMembers.js
index 5425696b13344..7b94b555eb16a 100644
--- a/tests/baselines/reference/primitiveMembers.js
+++ b/tests/baselines/reference/primitiveMembers.js
@@ -63,8 +63,7 @@ var baz = (function () {
 var foo = (function (_super) {
     __extends(foo, _super);
     function foo() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     foo.prototype.bar = function () { return undefined; };
     ;
diff --git a/tests/baselines/reference/privacyClass.js b/tests/baselines/reference/privacyClass.js
index 8181d0612a846..7e56edf2cf1b4 100644
--- a/tests/baselines/reference/privacyClass.js
+++ b/tests/baselines/reference/privacyClass.js
@@ -152,24 +152,21 @@ var m1;
     var m1_C1_private = (function (_super) {
         __extends(m1_C1_private, _super);
         function m1_C1_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C1_private;
     }(m1_c_public));
     var m1_C2_private = (function (_super) {
         __extends(m1_C2_private, _super);
         function m1_C2_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C2_private;
     }(m1_c_private));
     var m1_C3_public = (function (_super) {
         __extends(m1_C3_public, _super);
         function m1_C3_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C3_public;
     }(m1_c_public));
@@ -177,8 +174,7 @@ var m1;
     var m1_C4_public = (function (_super) {
         __extends(m1_C4_public, _super);
         function m1_C4_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C4_public;
     }(m1_c_private));
@@ -208,24 +204,21 @@ var m1;
     var m1_C9_private = (function (_super) {
         __extends(m1_C9_private, _super);
         function m1_C9_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C9_private;
     }(m1_c_public));
     var m1_C10_private = (function (_super) {
         __extends(m1_C10_private, _super);
         function m1_C10_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C10_private;
     }(m1_c_private));
     var m1_C11_public = (function (_super) {
         __extends(m1_C11_public, _super);
         function m1_C11_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C11_public;
     }(m1_c_public));
@@ -233,8 +226,7 @@ var m1;
     var m1_C12_public = (function (_super) {
         __extends(m1_C12_public, _super);
         function m1_C12_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C12_public;
     }(m1_c_private));
@@ -258,24 +250,21 @@ var m2;
     var m2_C1_private = (function (_super) {
         __extends(m2_C1_private, _super);
         function m2_C1_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C1_private;
     }(m2_c_public));
     var m2_C2_private = (function (_super) {
         __extends(m2_C2_private, _super);
         function m2_C2_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C2_private;
     }(m2_c_private));
     var m2_C3_public = (function (_super) {
         __extends(m2_C3_public, _super);
         function m2_C3_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C3_public;
     }(m2_c_public));
@@ -283,8 +272,7 @@ var m2;
     var m2_C4_public = (function (_super) {
         __extends(m2_C4_public, _super);
         function m2_C4_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C4_public;
     }(m2_c_private));
@@ -314,24 +302,21 @@ var m2;
     var m2_C9_private = (function (_super) {
         __extends(m2_C9_private, _super);
         function m2_C9_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C9_private;
     }(m2_c_public));
     var m2_C10_private = (function (_super) {
         __extends(m2_C10_private, _super);
         function m2_C10_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C10_private;
     }(m2_c_private));
     var m2_C11_public = (function (_super) {
         __extends(m2_C11_public, _super);
         function m2_C11_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C11_public;
     }(m2_c_public));
@@ -339,8 +324,7 @@ var m2;
     var m2_C12_public = (function (_super) {
         __extends(m2_C12_public, _super);
         function m2_C12_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m2_C12_public;
     }(m2_c_private));
@@ -362,24 +346,21 @@ var glo_c_private = (function () {
 var glo_C1_private = (function (_super) {
     __extends(glo_C1_private, _super);
     function glo_C1_private() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C1_private;
 }(glo_c_public));
 var glo_C2_private = (function (_super) {
     __extends(glo_C2_private, _super);
     function glo_C2_private() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C2_private;
 }(glo_c_private));
 var glo_C3_public = (function (_super) {
     __extends(glo_C3_public, _super);
     function glo_C3_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C3_public;
 }(glo_c_public));
@@ -387,8 +368,7 @@ exports.glo_C3_public = glo_C3_public;
 var glo_C4_public = (function (_super) {
     __extends(glo_C4_public, _super);
     function glo_C4_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C4_public;
 }(glo_c_private));
@@ -418,24 +398,21 @@ exports.glo_C8_public = glo_C8_public;
 var glo_C9_private = (function (_super) {
     __extends(glo_C9_private, _super);
     function glo_C9_private() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C9_private;
 }(glo_c_public));
 var glo_C10_private = (function (_super) {
     __extends(glo_C10_private, _super);
     function glo_C10_private() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C10_private;
 }(glo_c_private));
 var glo_C11_public = (function (_super) {
     __extends(glo_C11_public, _super);
     function glo_C11_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C11_public;
 }(glo_c_public));
@@ -443,8 +420,7 @@ exports.glo_C11_public = glo_C11_public;
 var glo_C12_public = (function (_super) {
     __extends(glo_C12_public, _super);
     function glo_C12_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C12_public;
 }(glo_c_private));
diff --git a/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js b/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
index fe3ae6ba6d0f3..e0828809416bd 100644
--- a/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
+++ b/tests/baselines/reference/privacyClassExtendsClauseDeclFile.js
@@ -122,24 +122,21 @@ var publicModule;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
@@ -147,8 +144,7 @@ var publicModule;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
@@ -156,16 +152,14 @@ var publicModule;
     var privateClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(privateClassExtendingFromPrivateModuleClass, _super);
         function privateClassExtendingFromPrivateModuleClass() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
     var publicClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(publicClassExtendingFromPrivateModuleClass, _super);
         function publicClassExtendingFromPrivateModuleClass() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
@@ -189,24 +183,21 @@ var privateModule;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPrivateModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPrivateModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPrivateModule));
@@ -214,8 +205,7 @@ var privateModule;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPrivateModule));
@@ -223,16 +213,14 @@ var privateModule;
     var privateClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(privateClassExtendingFromPrivateModuleClass, _super);
         function privateClassExtendingFromPrivateModuleClass() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
     var publicClassExtendingFromPrivateModuleClass = (function (_super) {
         __extends(publicClassExtendingFromPrivateModuleClass, _super);
         function publicClassExtendingFromPrivateModuleClass() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingFromPrivateModuleClass;
     }(privateModule.publicClassInPrivateModule));
@@ -254,24 +242,21 @@ var privateClass = (function () {
 var privateClassExtendingPublicClass = (function (_super) {
     __extends(privateClassExtendingPublicClass, _super);
     function privateClassExtendingPublicClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return privateClassExtendingPublicClass;
 }(publicClass));
 var privateClassExtendingPrivateClassInModule = (function (_super) {
     __extends(privateClassExtendingPrivateClassInModule, _super);
     function privateClassExtendingPrivateClassInModule() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return privateClassExtendingPrivateClassInModule;
 }(privateClass));
 var publicClassExtendingPublicClass = (function (_super) {
     __extends(publicClassExtendingPublicClass, _super);
     function publicClassExtendingPublicClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return publicClassExtendingPublicClass;
 }(publicClass));
@@ -279,8 +264,7 @@ exports.publicClassExtendingPublicClass = publicClassExtendingPublicClass;
 var publicClassExtendingPrivateClass = (function (_super) {
     __extends(publicClassExtendingPrivateClass, _super);
     function publicClassExtendingPrivateClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return publicClassExtendingPrivateClass;
 }(privateClass));
@@ -288,16 +272,14 @@ exports.publicClassExtendingPrivateClass = publicClassExtendingPrivateClass;
 var privateClassExtendingFromPrivateModuleClass = (function (_super) {
     __extends(privateClassExtendingFromPrivateModuleClass, _super);
     function privateClassExtendingFromPrivateModuleClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return privateClassExtendingFromPrivateModuleClass;
 }(privateModule.publicClassInPrivateModule));
 var publicClassExtendingFromPrivateModuleClass = (function (_super) {
     __extends(publicClassExtendingFromPrivateModuleClass, _super);
     function publicClassExtendingFromPrivateModuleClass() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return publicClassExtendingFromPrivateModuleClass;
 }(privateModule.publicClassInPrivateModule));
@@ -326,24 +308,21 @@ var publicModuleInGlobal;
     var privateClassExtendingPublicClassInModule = (function (_super) {
         __extends(privateClassExtendingPublicClassInModule, _super);
         function privateClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
     var privateClassExtendingPrivateClassInModule = (function (_super) {
         __extends(privateClassExtendingPrivateClassInModule, _super);
         function privateClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return privateClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
     var publicClassExtendingPublicClassInModule = (function (_super) {
         __extends(publicClassExtendingPublicClassInModule, _super);
         function publicClassExtendingPublicClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPublicClassInModule;
     }(publicClassInPublicModule));
@@ -351,8 +330,7 @@ var publicModuleInGlobal;
     var publicClassExtendingPrivateClassInModule = (function (_super) {
         __extends(publicClassExtendingPrivateClassInModule, _super);
         function publicClassExtendingPrivateClassInModule() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return publicClassExtendingPrivateClassInModule;
     }(privateClassInPublicModule));
@@ -366,8 +344,7 @@ var publicClassInGlobal = (function () {
 var publicClassExtendingPublicClassInGlobal = (function (_super) {
     __extends(publicClassExtendingPublicClassInGlobal, _super);
     function publicClassExtendingPublicClassInGlobal() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return publicClassExtendingPublicClassInGlobal;
 }(publicClassInGlobal));
diff --git a/tests/baselines/reference/privacyGloClass.js b/tests/baselines/reference/privacyGloClass.js
index 481a39219212f..fa769a606ae89 100644
--- a/tests/baselines/reference/privacyGloClass.js
+++ b/tests/baselines/reference/privacyGloClass.js
@@ -84,24 +84,21 @@ var m1;
     var m1_C1_private = (function (_super) {
         __extends(m1_C1_private, _super);
         function m1_C1_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C1_private;
     }(m1_c_public));
     var m1_C2_private = (function (_super) {
         __extends(m1_C2_private, _super);
         function m1_C2_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C2_private;
     }(m1_c_private));
     var m1_C3_public = (function (_super) {
         __extends(m1_C3_public, _super);
         function m1_C3_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C3_public;
     }(m1_c_public));
@@ -109,8 +106,7 @@ var m1;
     var m1_C4_public = (function (_super) {
         __extends(m1_C4_public, _super);
         function m1_C4_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C4_public;
     }(m1_c_private));
@@ -140,24 +136,21 @@ var m1;
     var m1_C9_private = (function (_super) {
         __extends(m1_C9_private, _super);
         function m1_C9_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C9_private;
     }(m1_c_public));
     var m1_C10_private = (function (_super) {
         __extends(m1_C10_private, _super);
         function m1_C10_private() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C10_private;
     }(m1_c_private));
     var m1_C11_public = (function (_super) {
         __extends(m1_C11_public, _super);
         function m1_C11_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C11_public;
     }(m1_c_public));
@@ -165,8 +158,7 @@ var m1;
     var m1_C12_public = (function (_super) {
         __extends(m1_C12_public, _super);
         function m1_C12_public() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return m1_C12_public;
     }(m1_c_private));
@@ -182,8 +174,7 @@ var glo_c_public = (function () {
 var glo_C3_public = (function (_super) {
     __extends(glo_C3_public, _super);
     function glo_C3_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C3_public;
 }(glo_c_public));
@@ -195,8 +186,7 @@ var glo_C7_public = (function () {
 var glo_C11_public = (function (_super) {
     __extends(glo_C11_public, _super);
     function glo_C11_public() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return glo_C11_public;
 }(glo_c_public));
diff --git a/tests/baselines/reference/privateAccessInSubclass1.js b/tests/baselines/reference/privateAccessInSubclass1.js
index ca432ee7ab76b..21ff4793fb35e 100644
--- a/tests/baselines/reference/privateAccessInSubclass1.js
+++ b/tests/baselines/reference/privateAccessInSubclass1.js
@@ -23,8 +23,7 @@ var Base = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.myMethod = function () {
         this.options;
diff --git a/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js b/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
index 8b516a5a19c79..b732661edfc3e 100644
--- a/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
+++ b/tests/baselines/reference/privateProtectedMembersAreNotAccessibleDestructuring.js
@@ -40,8 +40,7 @@ var K = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.prototype.m2 = function () {
         var a = this.priv; // error
diff --git a/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js b/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
index 44adec751bf08..11959f2f17468 100644
--- a/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
+++ b/tests/baselines/reference/privateStaticNotAccessibleInClodule2.js
@@ -29,8 +29,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
index ed9768b06c292..99a4842f63641 100644
--- a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
+++ b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/amd/testGlo.js
@@ -14,8 +14,7 @@ var m2;
     var class1 = (function (_super) {
         __extends(class1, _super);
         function class1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class1;
     }(m2.mExported.me.class1));
@@ -28,8 +27,7 @@ var m2;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class2;
     }(m2.mExported.me.class1));
@@ -42,8 +40,7 @@ var m2;
     var class3 = (function (_super) {
         __extends(class3, _super);
         function class3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class3;
     }(mNonExported.mne.class1));
@@ -56,8 +53,7 @@ var m2;
     var class4 = (function (_super) {
         __extends(class4, _super);
         function class4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class4;
     }(mNonExported.mne.class1));
diff --git a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
index ed9768b06c292..99a4842f63641 100644
--- a/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
+++ b/tests/baselines/reference/project/privacyCheckOnImportedModuleDeclarationsInsideModule/node/testGlo.js
@@ -14,8 +14,7 @@ var m2;
     var class1 = (function (_super) {
         __extends(class1, _super);
         function class1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class1;
     }(m2.mExported.me.class1));
@@ -28,8 +27,7 @@ var m2;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class2;
     }(m2.mExported.me.class1));
@@ -42,8 +40,7 @@ var m2;
     var class3 = (function (_super) {
         __extends(class3, _super);
         function class3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class3;
     }(mNonExported.mne.class1));
@@ -56,8 +53,7 @@ var m2;
     var class4 = (function (_super) {
         __extends(class4, _super);
         function class4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class4;
     }(mNonExported.mne.class1));
diff --git a/tests/baselines/reference/project/prologueEmit/amd/out.js b/tests/baselines/reference/project/prologueEmit/amd/out.js
index deb734487949b..7ee160b82efac 100644
--- a/tests/baselines/reference/project/prologueEmit/amd/out.js
+++ b/tests/baselines/reference/project/prologueEmit/amd/out.js
@@ -18,8 +18,7 @@ var m;
     var child = (function (_super) {
         __extends(child, _super);
         function child() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return child;
     }(base));
diff --git a/tests/baselines/reference/project/prologueEmit/node/out.js b/tests/baselines/reference/project/prologueEmit/node/out.js
index deb734487949b..7ee160b82efac 100644
--- a/tests/baselines/reference/project/prologueEmit/node/out.js
+++ b/tests/baselines/reference/project/prologueEmit/node/out.js
@@ -18,8 +18,7 @@ var m;
     var child = (function (_super) {
         __extends(child, _super);
         function child() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return child;
     }(base));
diff --git a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
index b5147a28919d4..b793b07534c46 100644
--- a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
+++ b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/amd/m'ain.js
@@ -7,8 +7,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ClassC = (function (_super) {
     __extends(ClassC, _super);
     function ClassC() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ClassC;
 }(test.ClassA));
diff --git a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
index b5147a28919d4..b793b07534c46 100644
--- a/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
+++ b/tests/baselines/reference/project/quotesInFileAndDirectoryNames/node/m'ain.js
@@ -7,8 +7,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var ClassC = (function (_super) {
     __extends(ClassC, _super);
     function ClassC() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ClassC;
 }(test.ClassA));
diff --git a/tests/baselines/reference/propertiesAndIndexers.js b/tests/baselines/reference/propertiesAndIndexers.js
index a22f966375414..dff86f3954e21 100644
--- a/tests/baselines/reference/propertiesAndIndexers.js
+++ b/tests/baselines/reference/propertiesAndIndexers.js
@@ -65,8 +65,7 @@ var P = (function () {
 var Q = (function (_super) {
     __extends(Q, _super);
     function Q() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Q;
 }(P));
diff --git a/tests/baselines/reference/propertyAccess.js b/tests/baselines/reference/propertyAccess.js
index 31b90bcf7ac2b..0a4c9082a2162 100644
--- a/tests/baselines/reference/propertyAccess.js
+++ b/tests/baselines/reference/propertyAccess.js
@@ -164,8 +164,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
index c570642a1ba3e..d36d7e27efe94 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints2.js
@@ -97,8 +97,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
index aebdc2c3ce30e..4aedfe12b0404 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints3.js
@@ -72,8 +72,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
index 442ae29e27883..3cb1443814122 100644
--- a/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
+++ b/tests/baselines/reference/propertyAccessOnTypeParameterWithConstraints5.js
@@ -59,8 +59,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () {
         return '';
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
index 40a1365b7e1c7..429dfdf6b14aa 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass.js
@@ -52,8 +52,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(C.prototype, "y", {
         get: function () { return this.x; },
@@ -94,8 +93,7 @@ var C = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return E;
 }(C));
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
index e6c768a67592c..0571b85ea9e2a 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinNestedSubclass1.js
@@ -147,8 +147,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.method1 = function () {
         var B = (function () {
@@ -174,8 +173,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.method2 = function () {
         var C = (function () {
@@ -201,8 +199,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.method3 = function () {
         var D = (function () {
@@ -228,8 +225,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived4.prototype.method4 = function () {
         var E = (function () {
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
index 3f46b69ecf35d..a10b39b402e4d 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass.js
@@ -34,8 +34,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(C.prototype, "y", {
         get: function () { return this.x; },
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
index 44a4fbdf284c3..a404b8049bc47 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass2.js
@@ -120,8 +120,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.method1 = function () {
         var b;
@@ -140,8 +139,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.prototype.method2 = function () {
         var b;
@@ -160,8 +158,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.prototype.method3 = function () {
         var b;
@@ -180,8 +177,7 @@ var Derived3 = (function (_super) {
 var Derived4 = (function (_super) {
     __extends(Derived4, _super);
     function Derived4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived4.prototype.method4 = function () {
         var b;
diff --git a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
index 4cc09bac99d15..7d449bdcbd4c9 100644
--- a/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
+++ b/tests/baselines/reference/protectedClassPropertyAccessibleWithinSubclass3.js
@@ -30,8 +30,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.method1 = function () {
         this.x; // OK, accessed within a subclass of the declaring class
diff --git a/tests/baselines/reference/protectedInstanceMemberAccessibility.js b/tests/baselines/reference/protectedInstanceMemberAccessibility.js
index 003e2f50e6f8f..3259d401270d8 100644
--- a/tests/baselines/reference/protectedInstanceMemberAccessibility.js
+++ b/tests/baselines/reference/protectedInstanceMemberAccessibility.js
@@ -61,8 +61,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.g = function () {
         var t1 = this.x;
@@ -94,8 +93,7 @@ var B = (function (_super) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/protectedMembers.js b/tests/baselines/reference/protectedMembers.js
index 984527b2c0d2b..46b4691dff77f 100644
--- a/tests/baselines/reference/protectedMembers.js
+++ b/tests/baselines/reference/protectedMembers.js
@@ -137,8 +137,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C2.prototype.f = function () {
         return _super.prototype.f.call(this) + this.x;
@@ -152,8 +151,7 @@ var C2 = (function (_super) {
 var C3 = (function (_super) {
     __extends(C3, _super);
     function C3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C3.prototype.f = function () {
         return _super.prototype.f.call(this);
@@ -189,16 +187,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     C.foo = function (a, b, c, d, e) {
         a.x = 1; // Error, access must be through C or type derived from C
@@ -212,8 +208,7 @@ var C = (function (_super) {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -244,8 +239,7 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A2));
@@ -258,8 +252,7 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
index a272ad42fa129..ad1b1682aa73e 100644
--- a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
+++ b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass.js
@@ -63,8 +63,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.staticMethod1 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
@@ -77,8 +76,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.staticMethod2 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
@@ -91,8 +89,7 @@ var Derived2 = (function (_super) {
 var Derived3 = (function (_super) {
     __extends(Derived3, _super);
     function Derived3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived3.staticMethod3 = function () {
         Base.x; // OK, accessed within a class derived from their declaring class
diff --git a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
index 2add5e7e154d7..a2346b8be40a3 100644
--- a/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
+++ b/tests/baselines/reference/protectedStaticClassPropertyAccessibleWithinSubclass2.js
@@ -38,8 +38,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.staticMethod1 = function () {
         this.x; // OK, accessed within a class derived from their declaring class
@@ -50,8 +49,7 @@ var Derived1 = (function (_super) {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived2.staticMethod3 = function () {
         this.x; // OK, accessed within a class derived from their declaring class
diff --git a/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js b/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
index 225acf74bbe69..a881eb55a1811 100644
--- a/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
+++ b/tests/baselines/reference/qualifiedName_entity-name-resolution-does-not-affect-class-heritage.js
@@ -19,8 +19,7 @@ var Alpha;
 var Beta = (function (_super) {
     __extends(Beta, _super);
     function Beta() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Beta;
 }(Alpha.x));
diff --git a/tests/baselines/reference/recursiveBaseCheck3.js b/tests/baselines/reference/recursiveBaseCheck3.js
index 5b3e829d2e6e5..250a9e0b6183a 100644
--- a/tests/baselines/reference/recursiveBaseCheck3.js
+++ b/tests/baselines/reference/recursiveBaseCheck3.js
@@ -13,16 +13,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var A = (function (_super) {
     __extends(A, _super);
     function A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return A;
 }(C));
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/recursiveBaseCheck4.js b/tests/baselines/reference/recursiveBaseCheck4.js
index b515c7ab318ef..7f0c6b5f95d51 100644
--- a/tests/baselines/reference/recursiveBaseCheck4.js
+++ b/tests/baselines/reference/recursiveBaseCheck4.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var M = (function (_super) {
     __extends(M, _super);
     function M() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return M;
 }(M));
diff --git a/tests/baselines/reference/recursiveBaseCheck6.js b/tests/baselines/reference/recursiveBaseCheck6.js
index 1871eff20d4bb..53a608baeca64 100644
--- a/tests/baselines/reference/recursiveBaseCheck6.js
+++ b/tests/baselines/reference/recursiveBaseCheck6.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var S18 = (function (_super) {
     __extends(S18, _super);
     function S18() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return S18;
 }(S18));
diff --git a/tests/baselines/reference/recursiveBaseConstructorCreation1.js b/tests/baselines/reference/recursiveBaseConstructorCreation1.js
index c2f884aa8e4bb..344750974cbfd 100644
--- a/tests/baselines/reference/recursiveBaseConstructorCreation1.js
+++ b/tests/baselines/reference/recursiveBaseConstructorCreation1.js
@@ -21,8 +21,7 @@ var C1 = (function () {
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(C1));
diff --git a/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js b/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
index f84c7ad3daef0..34aa110b7ee74 100644
--- a/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
+++ b/tests/baselines/reference/recursiveClassInstantiationsWithDefaultConstructors.js
@@ -28,8 +28,7 @@ var TypeScript2;
     var MemberNameArray = (function (_super) {
         __extends(MemberNameArray, _super);
         function MemberNameArray() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return MemberNameArray;
     }(MemberName));
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.js b/tests/baselines/reference/recursiveClassReferenceTest.js
index 2baa854e4625c..4c88b77822671 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.js
+++ b/tests/baselines/reference/recursiveClassReferenceTest.js
@@ -190,8 +190,7 @@ var Sample;
                 var Mode = (function (_super) {
                     __extends(Mode, _super);
                     function Mode() {
-                        var _this = _super.apply(this, arguments) || this;
-                        return _this;
+                        return _super.apply(this, arguments) || this;
                     }
                     // scenario 2
                     Mode.prototype.getInitialState = function () {
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.js.map b/tests/baselines/reference/recursiveClassReferenceTest.js.map
index 56c0fc4e6eb16..bd22ec3389852 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.js.map
+++ b/tests/baselines/reference/recursiveClassReferenceTest.js.map
@@ -1,2 +1,2 @@
 //// [recursiveClassReferenceTest.js.map]
-{"version":3,"file":"recursiveClassReferenceTest.js","sourceRoot":"","sources":["recursiveClassReferenceTest.ts"],"names":[],"mappings":"AAAA,iEAAiE;AACjE,0EAA0E;;;;;;AA8B1E,IAAO,MAAM,CAUZ;AAVD,WAAO,MAAM;IAAC,IAAA,OAAO,CAUpB;IAVa,WAAA,OAAO;QAAC,IAAA,KAAK,CAU1B;QAVqB,WAAA,OAAK;YAAC,IAAA,IAAI,CAU/B;YAV2B,WAAA,IAAI;gBAC/B;oBAAA;oBAQA,CAAC;oBANO,+BAAK,GAAZ,cAAiB,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBAExB,6BAAG,GAAV,UAAW,KAA6B;wBAEvC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBACF,sBAAC;gBAAD,CAAC,AARD,IAQC;gBARY,oBAAe,kBAQ3B,CAAA;YACF,CAAC,EAV2B,IAAI,GAAJ,YAAI,KAAJ,YAAI,QAU/B;QAAD,CAAC,EAVqB,KAAK,GAAL,aAAK,KAAL,aAAK,QAU1B;IAAD,CAAC,EAVa,OAAO,GAAP,cAAO,KAAP,cAAO,QAUpB;AAAD,CAAC,EAVM,MAAM,KAAN,MAAM,QAUZ;AAED,IAAO,MAAM,CAoBZ;AApBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAoBlB;IApBa,WAAA,KAAK;QAAC,IAAA,OAAO,CAoB1B;QApBmB,WAAA,OAAO;YAC1B;gBAKC,oBAAoB,SAAkC;oBAAlC,cAAS,GAAT,SAAS,CAAyB;oBAD9C,YAAO,GAAO,IAAI,CAAC;oBAEvB,aAAa;oBACb,SAAS,CAAC,SAAS,CAAC,WAAW,EAAE,IAAI,CAAC,CAAC;gBAC3C,CAAC;gBANM,wBAAG,GAAV,UAAW,MAAyC,IAAI,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;oBAAA,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;gBAAA,CAAC,CAAA,CAAC;gBAQlF,+BAAU,GAAjB;oBACC,MAAM,CAAC,OAAO,CAAC;gBAChB,CAAC;gBAEM,4BAAO,GAAd;gBAEA,CAAC;gBAEF,iBAAC;YAAD,CAAC,AAlBD,IAkBC;YAlBY,kBAAU,aAkBtB,CAAA;QACF,CAAC,EApBmB,OAAO,GAAP,aAAO,KAAP,aAAO,QAoB1B;IAAD,CAAC,EApBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAoBlB;AAAD,CAAC,EApBM,MAAM,KAAN,MAAM,QAoBZ;AAGD;IAAA;IAAuF,CAAC;IAA3C,sCAAe,GAAtB,cAAmC,MAAM,CAAC,IAAI,CAAC,CAAA,CAAC;IAAC,mBAAC;AAAD,CAAC,AAAxF,IAAwF;AASxF,IAAO,MAAM,CAwBZ;AAxBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAwBlB;IAxBa,WAAA,KAAK;QAAC,IAAA,SAAS,CAwB5B;QAxBmB,WAAA,SAAS;YAAC,IAAA,SAAS,CAwBtC;YAxB6B,WAAA,SAAS;gBAEtC;oBACO,eAAoB,IAAW;wBAAX,SAAI,GAAJ,IAAI,CAAO;oBAAI,CAAC;oBACnC,qBAAK,GAAZ;wBACC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBAEM,sBAAM,GAAb,UAAc,KAAY;wBACzB,MAAM,CAAC,IAAI,KAAK,KAAK,CAAC;oBACvB,CAAC;oBAEM,uBAAO,GAAd,cAA0B,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBACzC,YAAC;gBAAD,CAAC,AAXD,IAWC;gBAXY,eAAK,QAWjB,CAAA;gBAED;oBAA0B,wBAAY;oBAAtC;wBAA0B,kDAAY;;oBAQtC,CAAC;oBANA,aAAa;oBACN,8BAAe,GAAtB;wBACC,MAAM,CAAC,IAAI,KAAK,CAAC,IAAI,CAAC,CAAC;oBACxB,CAAC;oBAGF,WAAC;gBAAD,CAAC,AARD,CAA0B,YAAY,GAQrC;gBARY,cAAI,OAQhB,CAAA;YACF,CAAC,EAxB6B,SAAS,GAAT,mBAAS,KAAT,mBAAS,QAwBtC;QAAD,CAAC,EAxBmB,SAAS,GAAT,eAAS,KAAT,eAAS,QAwB5B;IAAD,CAAC,EAxBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAwBlB;AAAD,CAAC,EAxBM,MAAM,KAAN,MAAM,QAwBZ"}
\ No newline at end of file
+{"version":3,"file":"recursiveClassReferenceTest.js","sourceRoot":"","sources":["recursiveClassReferenceTest.ts"],"names":[],"mappings":"AAAA,iEAAiE;AACjE,0EAA0E;;;;;;AA8B1E,IAAO,MAAM,CAUZ;AAVD,WAAO,MAAM;IAAC,IAAA,OAAO,CAUpB;IAVa,WAAA,OAAO;QAAC,IAAA,KAAK,CAU1B;QAVqB,WAAA,OAAK;YAAC,IAAA,IAAI,CAU/B;YAV2B,WAAA,IAAI;gBAC/B;oBAAA;oBAQA,CAAC;oBANO,+BAAK,GAAZ,cAAiB,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBAExB,6BAAG,GAAV,UAAW,KAA6B;wBAEvC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBACF,sBAAC;gBAAD,CAAC,AARD,IAQC;gBARY,oBAAe,kBAQ3B,CAAA;YACF,CAAC,EAV2B,IAAI,GAAJ,YAAI,KAAJ,YAAI,QAU/B;QAAD,CAAC,EAVqB,KAAK,GAAL,aAAK,KAAL,aAAK,QAU1B;IAAD,CAAC,EAVa,OAAO,GAAP,cAAO,KAAP,cAAO,QAUpB;AAAD,CAAC,EAVM,MAAM,KAAN,MAAM,QAUZ;AAED,IAAO,MAAM,CAoBZ;AApBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAoBlB;IApBa,WAAA,KAAK;QAAC,IAAA,OAAO,CAoB1B;QApBmB,WAAA,OAAO;YAC1B;gBAKC,oBAAoB,SAAkC;oBAAlC,cAAS,GAAT,SAAS,CAAyB;oBAD9C,YAAO,GAAO,IAAI,CAAC;oBAEvB,aAAa;oBACb,SAAS,CAAC,SAAS,CAAC,WAAW,EAAE,IAAI,CAAC,CAAC;gBAC3C,CAAC;gBANM,wBAAG,GAAV,UAAW,MAAyC,IAAI,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC;oBAAA,MAAM,CAAC,MAAM,CAAC,IAAI,CAAC,CAAC;gBAAA,CAAC,CAAA,CAAC;gBAQlF,+BAAU,GAAjB;oBACC,MAAM,CAAC,OAAO,CAAC;gBAChB,CAAC;gBAEM,4BAAO,GAAd;gBAEA,CAAC;gBAEF,iBAAC;YAAD,CAAC,AAlBD,IAkBC;YAlBY,kBAAU,aAkBtB,CAAA;QACF,CAAC,EApBmB,OAAO,GAAP,aAAO,KAAP,aAAO,QAoB1B;IAAD,CAAC,EApBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAoBlB;AAAD,CAAC,EApBM,MAAM,KAAN,MAAM,QAoBZ;AAGD;IAAA;IAAuF,CAAC;IAA3C,sCAAe,GAAtB,cAAmC,MAAM,CAAC,IAAI,CAAC,CAAA,CAAC;IAAC,mBAAC;AAAD,CAAC,AAAxF,IAAwF;AASxF,IAAO,MAAM,CAwBZ;AAxBD,WAAO,MAAM;IAAC,IAAA,KAAK,CAwBlB;IAxBa,WAAA,KAAK;QAAC,IAAA,SAAS,CAwB5B;QAxBmB,WAAA,SAAS;YAAC,IAAA,SAAS,CAwBtC;YAxB6B,WAAA,SAAS;gBAEtC;oBACO,eAAoB,IAAW;wBAAX,SAAI,GAAJ,IAAI,CAAO;oBAAI,CAAC;oBACnC,qBAAK,GAAZ;wBACC,MAAM,CAAC,IAAI,CAAC;oBACb,CAAC;oBAEM,sBAAM,GAAb,UAAc,KAAY;wBACzB,MAAM,CAAC,IAAI,KAAK,KAAK,CAAC;oBACvB,CAAC;oBAEM,uBAAO,GAAd,cAA0B,MAAM,CAAC,IAAI,CAAC,CAAC,CAAC;oBACzC,YAAC;gBAAD,CAAC,AAXD,IAWC;gBAXY,eAAK,QAWjB,CAAA;gBAED;oBAA0B,wBAAY;oBAAtC;;oBAQA,CAAC;oBANA,aAAa;oBACN,8BAAe,GAAtB;wBACC,MAAM,CAAC,IAAI,KAAK,CAAC,IAAI,CAAC,CAAC;oBACxB,CAAC;oBAGF,WAAC;gBAAD,CAAC,AARD,CAA0B,YAAY,GAQrC;gBARY,cAAI,OAQhB,CAAA;YACF,CAAC,EAxB6B,SAAS,GAAT,mBAAS,KAAT,mBAAS,QAwBtC;QAAD,CAAC,EAxBmB,SAAS,GAAT,eAAS,KAAT,eAAS,QAwB5B;IAAD,CAAC,EAxBa,KAAK,GAAL,YAAK,KAAL,YAAK,QAwBlB;AAAD,CAAC,EAxBM,MAAM,KAAN,MAAM,QAwBZ"}
\ No newline at end of file
diff --git a/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt b/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
index 9656c07834342..9dfefe4e1dcf6 100644
--- a/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
+++ b/tests/baselines/reference/recursiveClassReferenceTest.sourcemap.txt
@@ -1692,24 +1692,16 @@ sourceFile:recursiveClassReferenceTest.ts
 ---
 >>>                    function Mode() {
 1 >^^^^^^^^^^^^^^^^^^^^
-2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+2 >                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1 >
 1 >Emitted(87, 21) Source(91, 2) + SourceIndex(0)
 ---
->>>                        var _this = _super.apply(this, arguments) || this;
-1->^^^^^^^^^^^^^^^^^^^^^^^^
-2 >                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-1->export class Mode extends 
-2 >                        AbstractMode
-1->Emitted(88, 25) Source(91, 28) + SourceIndex(0)
-2 >Emitted(88, 75) Source(91, 40) + SourceIndex(0)
----
->>>                        return _this;
+>>>                        return _super.apply(this, arguments) || this;
 >>>                    }
-1 >^^^^^^^^^^^^^^^^^^^^
+1->^^^^^^^^^^^^^^^^^^^^
 2 >                    ^
 3 >                     ^^^^^^^^^^^^^->
-1 > {
+1->export class Mode extends AbstractMode {
   >
   >		// scenario 2
   >		public getInitialState(): IState {
@@ -1719,8 +1711,8 @@ sourceFile:recursiveClassReferenceTest.ts
   >
   >	
 2 >                    }
-1 >Emitted(90, 21) Source(99, 2) + SourceIndex(0)
-2 >Emitted(90, 22) Source(99, 3) + SourceIndex(0)
+1->Emitted(89, 21) Source(99, 2) + SourceIndex(0)
+2 >Emitted(89, 22) Source(99, 3) + SourceIndex(0)
 ---
 >>>                    // scenario 2
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1728,8 +1720,8 @@ sourceFile:recursiveClassReferenceTest.ts
 3 >                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
 1->
 2 >                    // scenario 2
-1->Emitted(91, 21) Source(93, 3) + SourceIndex(0)
-2 >Emitted(91, 34) Source(93, 16) + SourceIndex(0)
+1->Emitted(90, 21) Source(93, 3) + SourceIndex(0)
+2 >Emitted(90, 34) Source(93, 16) + SourceIndex(0)
 ---
 >>>                    Mode.prototype.getInitialState = function () {
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1739,9 +1731,9 @@ sourceFile:recursiveClassReferenceTest.ts
   >		public 
 2 >                    getInitialState
 3 >                                                  
-1->Emitted(92, 21) Source(94, 10) + SourceIndex(0)
-2 >Emitted(92, 51) Source(94, 25) + SourceIndex(0)
-3 >Emitted(92, 54) Source(94, 3) + SourceIndex(0)
+1->Emitted(91, 21) Source(94, 10) + SourceIndex(0)
+2 >Emitted(91, 51) Source(94, 25) + SourceIndex(0)
+3 >Emitted(91, 54) Source(94, 3) + SourceIndex(0)
 ---
 >>>                        return new State(self);
 1 >^^^^^^^^^^^^^^^^^^^^^^^^
@@ -1763,15 +1755,15 @@ sourceFile:recursiveClassReferenceTest.ts
 7 >                                         self
 8 >                                             )
 9 >                                              ;
-1 >Emitted(93, 25) Source(95, 4) + SourceIndex(0)
-2 >Emitted(93, 31) Source(95, 10) + SourceIndex(0)
-3 >Emitted(93, 32) Source(95, 11) + SourceIndex(0)
-4 >Emitted(93, 36) Source(95, 15) + SourceIndex(0)
-5 >Emitted(93, 41) Source(95, 20) + SourceIndex(0)
-6 >Emitted(93, 42) Source(95, 21) + SourceIndex(0)
-7 >Emitted(93, 46) Source(95, 25) + SourceIndex(0)
-8 >Emitted(93, 47) Source(95, 26) + SourceIndex(0)
-9 >Emitted(93, 48) Source(95, 27) + SourceIndex(0)
+1 >Emitted(92, 25) Source(95, 4) + SourceIndex(0)
+2 >Emitted(92, 31) Source(95, 10) + SourceIndex(0)
+3 >Emitted(92, 32) Source(95, 11) + SourceIndex(0)
+4 >Emitted(92, 36) Source(95, 15) + SourceIndex(0)
+5 >Emitted(92, 41) Source(95, 20) + SourceIndex(0)
+6 >Emitted(92, 42) Source(95, 21) + SourceIndex(0)
+7 >Emitted(92, 46) Source(95, 25) + SourceIndex(0)
+8 >Emitted(92, 47) Source(95, 26) + SourceIndex(0)
+9 >Emitted(92, 48) Source(95, 27) + SourceIndex(0)
 ---
 >>>                    };
 1 >^^^^^^^^^^^^^^^^^^^^
@@ -1780,8 +1772,8 @@ sourceFile:recursiveClassReferenceTest.ts
 1 >
   >		
 2 >                    }
-1 >Emitted(94, 21) Source(96, 3) + SourceIndex(0)
-2 >Emitted(94, 22) Source(96, 4) + SourceIndex(0)
+1 >Emitted(93, 21) Source(96, 3) + SourceIndex(0)
+2 >Emitted(93, 22) Source(96, 4) + SourceIndex(0)
 ---
 >>>                    return Mode;
 1->^^^^^^^^^^^^^^^^^^^^
@@ -1792,8 +1784,8 @@ sourceFile:recursiveClassReferenceTest.ts
   >
   >	
 2 >                    }
-1->Emitted(95, 21) Source(99, 2) + SourceIndex(0)
-2 >Emitted(95, 32) Source(99, 3) + SourceIndex(0)
+1->Emitted(94, 21) Source(99, 2) + SourceIndex(0)
+2 >Emitted(94, 32) Source(99, 3) + SourceIndex(0)
 ---
 >>>                }(AbstractMode));
 1->^^^^^^^^^^^^^^^^
@@ -1817,12 +1809,12 @@ sourceFile:recursiveClassReferenceTest.ts
   >                              
   >                              
   >                              	}
-1->Emitted(96, 17) Source(99, 2) + SourceIndex(0)
-2 >Emitted(96, 18) Source(99, 3) + SourceIndex(0)
-3 >Emitted(96, 18) Source(91, 2) + SourceIndex(0)
-4 >Emitted(96, 19) Source(91, 28) + SourceIndex(0)
-5 >Emitted(96, 31) Source(91, 40) + SourceIndex(0)
-6 >Emitted(96, 34) Source(99, 3) + SourceIndex(0)
+1->Emitted(95, 17) Source(99, 2) + SourceIndex(0)
+2 >Emitted(95, 18) Source(99, 3) + SourceIndex(0)
+3 >Emitted(95, 18) Source(91, 2) + SourceIndex(0)
+4 >Emitted(95, 19) Source(91, 28) + SourceIndex(0)
+5 >Emitted(95, 31) Source(91, 40) + SourceIndex(0)
+6 >Emitted(95, 34) Source(99, 3) + SourceIndex(0)
 ---
 >>>                PlainText.Mode = Mode;
 1->^^^^^^^^^^^^^^^^
@@ -1842,10 +1834,10 @@ sourceFile:recursiveClassReferenceTest.ts
   >                              
   >                              	}
 4 >                                     
-1->Emitted(97, 17) Source(91, 15) + SourceIndex(0)
-2 >Emitted(97, 31) Source(91, 19) + SourceIndex(0)
-3 >Emitted(97, 38) Source(99, 3) + SourceIndex(0)
-4 >Emitted(97, 39) Source(99, 3) + SourceIndex(0)
+1->Emitted(96, 17) Source(91, 15) + SourceIndex(0)
+2 >Emitted(96, 31) Source(91, 19) + SourceIndex(0)
+3 >Emitted(96, 38) Source(99, 3) + SourceIndex(0)
+4 >Emitted(96, 39) Source(99, 3) + SourceIndex(0)
 ---
 >>>            })(PlainText = Languages.PlainText || (Languages.PlainText = {}));
 1->^^^^^^^^^^^^
@@ -1891,15 +1883,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                                                      
   >                                                                      	}
   >                                                                      }
-1->Emitted(98, 13) Source(100, 1) + SourceIndex(0)
-2 >Emitted(98, 14) Source(100, 2) + SourceIndex(0)
-3 >Emitted(98, 16) Source(76, 31) + SourceIndex(0)
-4 >Emitted(98, 25) Source(76, 40) + SourceIndex(0)
-5 >Emitted(98, 28) Source(76, 31) + SourceIndex(0)
-6 >Emitted(98, 47) Source(76, 40) + SourceIndex(0)
-7 >Emitted(98, 52) Source(76, 31) + SourceIndex(0)
-8 >Emitted(98, 71) Source(76, 40) + SourceIndex(0)
-9 >Emitted(98, 79) Source(100, 2) + SourceIndex(0)
+1->Emitted(97, 13) Source(100, 1) + SourceIndex(0)
+2 >Emitted(97, 14) Source(100, 2) + SourceIndex(0)
+3 >Emitted(97, 16) Source(76, 31) + SourceIndex(0)
+4 >Emitted(97, 25) Source(76, 40) + SourceIndex(0)
+5 >Emitted(97, 28) Source(76, 31) + SourceIndex(0)
+6 >Emitted(97, 47) Source(76, 40) + SourceIndex(0)
+7 >Emitted(97, 52) Source(76, 31) + SourceIndex(0)
+8 >Emitted(97, 71) Source(76, 40) + SourceIndex(0)
+9 >Emitted(97, 79) Source(100, 2) + SourceIndex(0)
 ---
 >>>        })(Languages = Thing.Languages || (Thing.Languages = {}));
 1 >^^^^^^^^
@@ -1944,15 +1936,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                                          
   >                                                          	}
   >                                                          }
-1 >Emitted(99, 9) Source(100, 1) + SourceIndex(0)
-2 >Emitted(99, 10) Source(100, 2) + SourceIndex(0)
-3 >Emitted(99, 12) Source(76, 21) + SourceIndex(0)
-4 >Emitted(99, 21) Source(76, 30) + SourceIndex(0)
-5 >Emitted(99, 24) Source(76, 21) + SourceIndex(0)
-6 >Emitted(99, 39) Source(76, 30) + SourceIndex(0)
-7 >Emitted(99, 44) Source(76, 21) + SourceIndex(0)
-8 >Emitted(99, 59) Source(76, 30) + SourceIndex(0)
-9 >Emitted(99, 67) Source(100, 2) + SourceIndex(0)
+1 >Emitted(98, 9) Source(100, 1) + SourceIndex(0)
+2 >Emitted(98, 10) Source(100, 2) + SourceIndex(0)
+3 >Emitted(98, 12) Source(76, 21) + SourceIndex(0)
+4 >Emitted(98, 21) Source(76, 30) + SourceIndex(0)
+5 >Emitted(98, 24) Source(76, 21) + SourceIndex(0)
+6 >Emitted(98, 39) Source(76, 30) + SourceIndex(0)
+7 >Emitted(98, 44) Source(76, 21) + SourceIndex(0)
+8 >Emitted(98, 59) Source(76, 30) + SourceIndex(0)
+9 >Emitted(98, 67) Source(100, 2) + SourceIndex(0)
 ---
 >>>    })(Thing = Sample.Thing || (Sample.Thing = {}));
 1 >^^^^
@@ -1997,15 +1989,15 @@ sourceFile:recursiveClassReferenceTest.ts
   >                                            
   >                                            	}
   >                                            }
-1 >Emitted(100, 5) Source(100, 1) + SourceIndex(0)
-2 >Emitted(100, 6) Source(100, 2) + SourceIndex(0)
-3 >Emitted(100, 8) Source(76, 15) + SourceIndex(0)
-4 >Emitted(100, 13) Source(76, 20) + SourceIndex(0)
-5 >Emitted(100, 16) Source(76, 15) + SourceIndex(0)
-6 >Emitted(100, 28) Source(76, 20) + SourceIndex(0)
-7 >Emitted(100, 33) Source(76, 15) + SourceIndex(0)
-8 >Emitted(100, 45) Source(76, 20) + SourceIndex(0)
-9 >Emitted(100, 53) Source(100, 2) + SourceIndex(0)
+1 >Emitted(99, 5) Source(100, 1) + SourceIndex(0)
+2 >Emitted(99, 6) Source(100, 2) + SourceIndex(0)
+3 >Emitted(99, 8) Source(76, 15) + SourceIndex(0)
+4 >Emitted(99, 13) Source(76, 20) + SourceIndex(0)
+5 >Emitted(99, 16) Source(76, 15) + SourceIndex(0)
+6 >Emitted(99, 28) Source(76, 20) + SourceIndex(0)
+7 >Emitted(99, 33) Source(76, 15) + SourceIndex(0)
+8 >Emitted(99, 45) Source(76, 20) + SourceIndex(0)
+9 >Emitted(99, 53) Source(100, 2) + SourceIndex(0)
 ---
 >>>})(Sample || (Sample = {}));
 1 >
@@ -2047,12 +2039,12 @@ sourceFile:recursiveClassReferenceTest.ts
   >                    
   >                    	}
   >                    }
-1 >Emitted(101, 1) Source(100, 1) + SourceIndex(0)
-2 >Emitted(101, 2) Source(100, 2) + SourceIndex(0)
-3 >Emitted(101, 4) Source(76, 8) + SourceIndex(0)
-4 >Emitted(101, 10) Source(76, 14) + SourceIndex(0)
-5 >Emitted(101, 15) Source(76, 8) + SourceIndex(0)
-6 >Emitted(101, 21) Source(76, 14) + SourceIndex(0)
-7 >Emitted(101, 29) Source(100, 2) + SourceIndex(0)
+1 >Emitted(100, 1) Source(100, 1) + SourceIndex(0)
+2 >Emitted(100, 2) Source(100, 2) + SourceIndex(0)
+3 >Emitted(100, 4) Source(76, 8) + SourceIndex(0)
+4 >Emitted(100, 10) Source(76, 14) + SourceIndex(0)
+5 >Emitted(100, 15) Source(76, 8) + SourceIndex(0)
+6 >Emitted(100, 21) Source(76, 14) + SourceIndex(0)
+7 >Emitted(100, 29) Source(100, 2) + SourceIndex(0)
 ---
 >>>//# sourceMappingURL=recursiveClassReferenceTest.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/recursiveComplicatedClasses.js b/tests/baselines/reference/recursiveComplicatedClasses.js
index ea31184d8567a..8441ff9e15a78 100644
--- a/tests/baselines/reference/recursiveComplicatedClasses.js
+++ b/tests/baselines/reference/recursiveComplicatedClasses.js
@@ -51,24 +51,21 @@ var Symbol = (function () {
 var InferenceSymbol = (function (_super) {
     __extends(InferenceSymbol, _super);
     function InferenceSymbol() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return InferenceSymbol;
 }(Symbol));
 var ParameterSymbol = (function (_super) {
     __extends(ParameterSymbol, _super);
     function ParameterSymbol() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ParameterSymbol;
 }(InferenceSymbol));
 var TypeSymbol = (function (_super) {
     __extends(TypeSymbol, _super);
     function TypeSymbol() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return TypeSymbol;
 }(InferenceSymbol));
diff --git a/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js b/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
index 72c97c309660a..76224741e6033 100644
--- a/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
+++ b/tests/baselines/reference/recursivelySpecializedConstructorDeclaration.js
@@ -52,8 +52,7 @@ var MsPortal;
                 var ViewModel = (function (_super) {
                     __extends(ViewModel, _super);
                     function ViewModel() {
-                        var _this = _super.apply(this, arguments) || this;
-                        return _this;
+                        return _super.apply(this, arguments) || this;
                     }
                     return ViewModel;
                 }(ItemValue));
diff --git a/tests/baselines/reference/reexportClassDefinition.js b/tests/baselines/reference/reexportClassDefinition.js
index 95ce777e446f3..a75a90d4d8687 100644
--- a/tests/baselines/reference/reexportClassDefinition.js
+++ b/tests/baselines/reference/reexportClassDefinition.js
@@ -42,8 +42,7 @@ var foo2 = require("./foo2");
 var x = (function (_super) {
     __extends(x, _super);
     function x() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return x;
 }(foo2.x));
diff --git a/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js b/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
index d2ec8e168bfad..615b0034caaa5 100644
--- a/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
+++ b/tests/baselines/reference/resolvingClassDeclarationWhenInBaseTypeResolution.js
@@ -1030,8 +1030,7 @@ var rionegrensis;
     var caniventer = (function (_super) {
         __extends(caniventer, _super);
         function caniventer() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         caniventer.prototype.salomonseni = function () {
             var _this = this;
@@ -1069,8 +1068,7 @@ var rionegrensis;
     var veraecrucis = (function (_super) {
         __extends(veraecrucis, _super);
         function veraecrucis() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         veraecrucis.prototype.naso = function () {
             var _this = this;
@@ -1249,8 +1247,7 @@ var julianae;
     var oralis = (function (_super) {
         __extends(oralis, _super);
         function oralis() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         oralis.prototype.cepapi = function () {
             var _this = this;
@@ -1336,8 +1333,7 @@ var julianae;
     var sumatrana = (function (_super) {
         __extends(sumatrana, _super);
         function sumatrana() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         sumatrana.prototype.wolffsohni = function () {
             var _this = this;
@@ -1537,8 +1533,7 @@ var julianae;
     var durangae = (function (_super) {
         __extends(durangae, _super);
         function durangae() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         durangae.prototype.Californium = function () {
             var _this = this;
@@ -1612,8 +1607,7 @@ var Lanthanum;
     var nitidus = (function (_super) {
         __extends(nitidus, _super);
         function nitidus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         nitidus.prototype.granatensis = function () {
             var _this = this;
@@ -1681,8 +1675,7 @@ var Lanthanum;
     var megalonyx = (function (_super) {
         __extends(megalonyx, _super);
         function megalonyx() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         megalonyx.prototype.phillipsii = function () {
             var _this = this;
@@ -1831,8 +1824,7 @@ var rendalli;
     var zuluensis = (function (_super) {
         __extends(zuluensis, _super);
         function zuluensis() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         zuluensis.prototype.telfairi = function () {
             var _this = this;
@@ -1990,8 +1982,7 @@ var rendalli;
     var crenulata = (function (_super) {
         __extends(crenulata, _super);
         function crenulata() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         crenulata.prototype.salvanius = function () {
             var _this = this;
@@ -2074,8 +2065,7 @@ var trivirgatus;
     var mixtus = (function (_super) {
         __extends(mixtus, _super);
         function mixtus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         mixtus.prototype.ochrogaster = function () {
             var _this = this;
@@ -2317,8 +2307,7 @@ var ruatanica;
     var americanus = (function (_super) {
         __extends(americanus, _super);
         function americanus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         americanus.prototype.nasoloi = function () {
             var _this = this;
@@ -2353,8 +2342,7 @@ var lavali;
     var wilsoni = (function (_super) {
         __extends(wilsoni, _super);
         function wilsoni() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         wilsoni.prototype.setiger = function () {
             var _this = this;
@@ -2446,8 +2434,7 @@ var lavali;
     var otion = (function (_super) {
         __extends(otion, _super);
         function otion() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         otion.prototype.bonaerensis = function () {
             var _this = this;
@@ -2611,8 +2598,7 @@ var lavali;
     var thaeleri = (function (_super) {
         __extends(thaeleri, _super);
         function thaeleri() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         thaeleri.prototype.coromandra = function () {
             var _this = this;
@@ -2668,8 +2654,7 @@ var lavali;
     var lepturus = (function (_super) {
         __extends(lepturus, _super);
         function lepturus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         lepturus.prototype.ferrumequinum = function () {
             var _this = this;
@@ -2692,8 +2677,7 @@ var dogramacii;
     var robustulus = (function (_super) {
         __extends(robustulus, _super);
         function robustulus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         robustulus.prototype.fossor = function () {
             var _this = this;
@@ -2908,8 +2892,7 @@ var lutreolus;
     var schlegeli = (function (_super) {
         __extends(schlegeli, _super);
         function schlegeli() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         schlegeli.prototype.mittendorfi = function () {
             var _this = this;
@@ -3136,8 +3119,7 @@ var panglima;
     var amphibius = (function (_super) {
         __extends(amphibius, _super);
         function amphibius() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         amphibius.prototype.bottegi = function () {
             var _this = this;
@@ -3181,8 +3163,7 @@ var panglima;
     var fundatus = (function (_super) {
         __extends(fundatus, _super);
         function fundatus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         fundatus.prototype.crassulus = function () {
             var _this = this;
@@ -3208,8 +3189,7 @@ var panglima;
     var abidi = (function (_super) {
         __extends(abidi, _super);
         function abidi() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         abidi.prototype.greyii = function () {
             var _this = this;
@@ -3301,8 +3281,7 @@ var minutus;
     var himalayana = (function (_super) {
         __extends(himalayana, _super);
         function himalayana() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         himalayana.prototype.simoni = function () {
             var _this = this;
@@ -3385,8 +3364,7 @@ var caurinus;
     var mahaganus = (function (_super) {
         __extends(mahaganus, _super);
         function mahaganus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         mahaganus.prototype.martiniquensis = function () {
             var _this = this;
@@ -3460,8 +3438,7 @@ var howi;
     var angulatus = (function (_super) {
         __extends(angulatus, _super);
         function angulatus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         angulatus.prototype.pennatus = function () {
             var _this = this;
@@ -3544,8 +3521,7 @@ var sagitta;
     var walkeri = (function (_super) {
         __extends(walkeri, _super);
         function walkeri() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         walkeri.prototype.maracajuensis = function () {
             var _this = this;
@@ -3562,8 +3538,7 @@ var minutus;
     var inez = (function (_super) {
         __extends(inez, _super);
         function inez() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         inez.prototype.vexillaris = function () {
             var _this = this;
@@ -3580,8 +3555,7 @@ var macrorhinos;
     var konganensis = (function (_super) {
         __extends(konganensis, _super);
         function konganensis() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return konganensis;
     }(imperfecta.lasiurus));
@@ -3592,8 +3566,7 @@ var panamensis;
     var linulus = (function (_super) {
         __extends(linulus, _super);
         function linulus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         linulus.prototype.goslingi = function () {
             var _this = this;
@@ -3745,8 +3718,7 @@ var samarensis;
     var pelurus = (function (_super) {
         __extends(pelurus, _super);
         function pelurus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         pelurus.prototype.Palladium = function () {
             var _this = this;
@@ -3832,8 +3804,7 @@ var samarensis;
     var fuscus = (function (_super) {
         __extends(fuscus, _super);
         function fuscus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         fuscus.prototype.planifrons = function () {
             var _this = this;
@@ -3994,8 +3965,7 @@ var sagitta;
     var leptoceros = (function (_super) {
         __extends(leptoceros, _super);
         function leptoceros() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         leptoceros.prototype.victus = function () {
             var _this = this;
@@ -4036,8 +4006,7 @@ var daubentonii;
     var nigricans = (function (_super) {
         __extends(nigricans, _super);
         function nigricans() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         nigricans.prototype.woosnami = function () {
             var _this = this;
@@ -4063,8 +4032,7 @@ var argurus;
     var pygmaea = (function (_super) {
         __extends(pygmaea, _super);
         function pygmaea() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         pygmaea.prototype.pajeros = function () {
             var _this = this;
@@ -4093,8 +4061,7 @@ var chrysaeolus;
     var sarasinorum = (function (_super) {
         __extends(sarasinorum, _super);
         function sarasinorum() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         sarasinorum.prototype.belzebul = function () {
             var _this = this;
@@ -4198,8 +4165,7 @@ var argurus;
     var oreas = (function (_super) {
         __extends(oreas, _super);
         function oreas() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         oreas.prototype.salamonis = function () {
             var _this = this;
@@ -4426,8 +4392,7 @@ var provocax;
     var melanoleuca = (function (_super) {
         __extends(melanoleuca, _super);
         function melanoleuca() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         melanoleuca.prototype.Neodymium = function () {
             var _this = this;
@@ -4471,8 +4436,7 @@ var howi;
     var marcanoi = (function (_super) {
         __extends(marcanoi, _super);
         function marcanoi() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         marcanoi.prototype.formosae = function () {
             var _this = this;
@@ -4879,8 +4843,7 @@ var gabriellae;
     var klossii = (function (_super) {
         __extends(klossii, _super);
         function klossii() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return klossii;
     }(imperfecta.lasiurus));
@@ -5083,8 +5046,7 @@ var imperfecta;
     var ciliolabrum = (function (_super) {
         __extends(ciliolabrum, _super);
         function ciliolabrum() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         ciliolabrum.prototype.leschenaultii = function () {
             var _this = this;
@@ -5146,8 +5108,7 @@ var petrophilus;
     var sodyi = (function (_super) {
         __extends(sodyi, _super);
         function sodyi() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         sodyi.prototype.saundersiae = function () {
             var _this = this;
@@ -5212,8 +5173,7 @@ var caurinus;
     var megaphyllus = (function (_super) {
         __extends(megaphyllus, _super);
         function megaphyllus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         megaphyllus.prototype.montana = function () {
             var _this = this;
@@ -5386,8 +5346,7 @@ var lutreolus;
     var cor = (function (_super) {
         __extends(cor, _super);
         function cor() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         cor.prototype.antinorii = function () {
             var _this = this;
@@ -5479,8 +5438,7 @@ var argurus;
     var germaini = (function (_super) {
         __extends(germaini, _super);
         function germaini() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         germaini.prototype.sharpei = function () {
             var _this = this;
@@ -5578,8 +5536,7 @@ var dammermani;
     var melanops = (function (_super) {
         __extends(melanops, _super);
         function melanops() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         melanops.prototype.blarina = function () {
             var _this = this;
@@ -5668,8 +5625,7 @@ var argurus;
     var peninsulae = (function (_super) {
         __extends(peninsulae, _super);
         function peninsulae() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         peninsulae.prototype.aitkeni = function () {
             var _this = this;
@@ -5815,8 +5771,7 @@ var ruatanica;
     var Praseodymium = (function (_super) {
         __extends(Praseodymium, _super);
         function Praseodymium() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         Praseodymium.prototype.clara = function () {
             var _this = this;
@@ -5905,8 +5860,7 @@ var caurinus;
     var johorensis = (function (_super) {
         __extends(johorensis, _super);
         function johorensis() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         johorensis.prototype.maini = function () {
             var _this = this;
@@ -6034,8 +5988,7 @@ var caurinus;
     var psilurus = (function (_super) {
         __extends(psilurus, _super);
         function psilurus() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         psilurus.prototype.socialis = function () {
             var _this = this;
diff --git a/tests/baselines/reference/returnStatements.js b/tests/baselines/reference/returnStatements.js
index 659eea55689ba..f786e9949634e 100644
--- a/tests/baselines/reference/returnStatements.js
+++ b/tests/baselines/reference/returnStatements.js
@@ -48,8 +48,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js b/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
index 02c812454459b..1474f8ab29a82 100644
--- a/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
+++ b/tests/baselines/reference/scopeCheckExtendedClassInsidePublicMethod2.js
@@ -22,8 +22,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.c = function () {
         v = 1;
diff --git a/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js b/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
index 781fd5ac6eef1..0baf01870094c 100644
--- a/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
+++ b/tests/baselines/reference/scopeCheckExtendedClassInsideStaticMethod1.js
@@ -22,8 +22,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.c = function () {
         v = 1;
diff --git a/tests/baselines/reference/shadowPrivateMembers.js b/tests/baselines/reference/shadowPrivateMembers.js
index d7e1b69e27451..4906814f7eb43 100644
--- a/tests/baselines/reference/shadowPrivateMembers.js
+++ b/tests/baselines/reference/shadowPrivateMembers.js
@@ -18,8 +18,7 @@ var base = (function () {
 var derived = (function (_super) {
     __extends(derived, _super);
     function derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     derived.prototype.n = function () { };
     return derived;
diff --git a/tests/baselines/reference/specializedInheritedConstructors1.js b/tests/baselines/reference/specializedInheritedConstructors1.js
index 4f14cb6db97d5..f65f42941bfdb 100644
--- a/tests/baselines/reference/specializedInheritedConstructors1.js
+++ b/tests/baselines/reference/specializedInheritedConstructors1.js
@@ -36,8 +36,7 @@ var Model = (function () {
 var MyView = (function (_super) {
     __extends(MyView, _super);
     function MyView() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyView;
 }(View));
diff --git a/tests/baselines/reference/specializedOverloadWithRestParameters.js b/tests/baselines/reference/specializedOverloadWithRestParameters.js
index 3b909a8083646..b76afaff08c37 100644
--- a/tests/baselines/reference/specializedOverloadWithRestParameters.js
+++ b/tests/baselines/reference/specializedOverloadWithRestParameters.js
@@ -27,8 +27,7 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived1.prototype.bar = function () { };
     return Derived1;
diff --git a/tests/baselines/reference/staticFactory1.js b/tests/baselines/reference/staticFactory1.js
index d229c5330ba5a..de7588c3ebefc 100644
--- a/tests/baselines/reference/staticFactory1.js
+++ b/tests/baselines/reference/staticFactory1.js
@@ -31,8 +31,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Derived.prototype.foo = function () { return 2; };
     return Derived;
diff --git a/tests/baselines/reference/staticMemberAccessOffDerivedType1.js b/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
index a07bea081a9fa..7b8ca52b9a41f 100644
--- a/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
+++ b/tests/baselines/reference/staticMemberAccessOffDerivedType1.js
@@ -26,8 +26,7 @@ var SomeBase = (function () {
 var P = (function (_super) {
     __extends(P, _super);
     function P() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return P;
 }(SomeBase));
diff --git a/tests/baselines/reference/strictModeReservedWord.js b/tests/baselines/reference/strictModeReservedWord.js
index af01ca1716f9d..29715745890eb 100644
--- a/tests/baselines/reference/strictModeReservedWord.js
+++ b/tests/baselines/reference/strictModeReservedWord.js
@@ -48,8 +48,7 @@ function foo() {
     var myClass = (function (_super) {
         __extends(package, _super);
         function package() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return package;
     }(public));
diff --git a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
index 300d83b9bbceb..1507e53d8cf8d 100644
--- a/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
+++ b/tests/baselines/reference/strictModeReservedWordInClassDeclaration.js
@@ -75,16 +75,14 @@ var F1 = (function () {
 var G = (function (_super) {
     __extends(G, _super);
     function G() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return G;
 }(package));
 var H = (function (_super) {
     __extends(H, _super);
     function H() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return H;
 }(package.A));
diff --git a/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js b/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
index eb5052f51d7db..b532df7b1201a 100644
--- a/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
+++ b/tests/baselines/reference/stringIndexerConstrainsPropertyDeclarations2.js
@@ -55,8 +55,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.bar = function () { return ''; };
     return B;
diff --git a/tests/baselines/reference/subtypesOfTypeParameter.js b/tests/baselines/reference/subtypesOfTypeParameter.js
index cbe42a510b34d..a6606c5d55989 100644
--- a/tests/baselines/reference/subtypesOfTypeParameter.js
+++ b/tests/baselines/reference/subtypesOfTypeParameter.js
@@ -120,8 +120,7 @@ var C3 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(C3));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
index 568002483939a..82bcbf14eccf9 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints.js
@@ -182,32 +182,28 @@ var C3 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(C3));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(C3));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D3;
 }(C3));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D4;
 }(C3));
@@ -217,24 +213,21 @@ var D4 = (function (_super) {
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D5;
 }(C3));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D6;
 }(C3));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D7;
 }(C3));
@@ -243,24 +236,21 @@ var D7 = (function (_super) {
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D8;
 }(C3));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D9;
 }(C3));
 var D10 = (function (_super) {
     __extends(D10, _super);
     function D10() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D10;
 }(C3));
@@ -269,24 +259,21 @@ var D10 = (function (_super) {
 var D11 = (function (_super) {
     __extends(D11, _super);
     function D11() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D11;
 }(C3));
 var D12 = (function (_super) {
     __extends(D12, _super);
     function D12() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D12;
 }(C3));
 var D13 = (function (_super) {
     __extends(D13, _super);
     function D13() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D13;
 }(C3));
@@ -296,32 +283,28 @@ var D13 = (function (_super) {
 var D14 = (function (_super) {
     __extends(D14, _super);
     function D14() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D14;
 }(C3));
 var D15 = (function (_super) {
     __extends(D15, _super);
     function D15() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D15;
 }(C3));
 var D16 = (function (_super) {
     __extends(D16, _super);
     function D16() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D16;
 }(C3));
 var D17 = (function (_super) {
     __extends(D17, _super);
     function D17() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D17;
 }(C3));
@@ -330,32 +313,28 @@ var D17 = (function (_super) {
 var D18 = (function (_super) {
     __extends(D18, _super);
     function D18() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D18;
 }(C3));
 var D19 = (function (_super) {
     __extends(D19, _super);
     function D19() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D19;
 }(C3));
 var D20 = (function (_super) {
     __extends(D20, _super);
     function D20() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D20;
 }(C3));
 var D21 = (function (_super) {
     __extends(D21, _super);
     function D21() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D21;
 }(C3));
@@ -364,32 +343,28 @@ var D21 = (function (_super) {
 var D22 = (function (_super) {
     __extends(D22, _super);
     function D22() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D22;
 }(C3));
 var D23 = (function (_super) {
     __extends(D23, _super);
     function D23() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D23;
 }(C3));
 var D24 = (function (_super) {
     __extends(D24, _super);
     function D24() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D24;
 }(C3));
 var D25 = (function (_super) {
     __extends(D25, _super);
     function D25() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D25;
 }(C3));
@@ -398,32 +373,28 @@ var D25 = (function (_super) {
 var D26 = (function (_super) {
     __extends(D26, _super);
     function D26() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D26;
 }(C3));
 var D27 = (function (_super) {
     __extends(D27, _super);
     function D27() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D27;
 }(C3));
 var D28 = (function (_super) {
     __extends(D28, _super);
     function D28() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D28;
 }(C3));
 var D29 = (function (_super) {
     __extends(D29, _super);
     function D29() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D29;
 }(C3));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
index e4e35262d80d6..e0baced37a4ea 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithConstraints4.js
@@ -118,72 +118,63 @@ var B1 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(B1));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(B1));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D3;
 }(B1));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D4;
 }(B1));
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D5;
 }(B1));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D6;
 }(B1));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D7;
 }(B1));
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D8;
 }(B1));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D9;
 }(B1));
diff --git a/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js b/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
index 0d1347cd33c91..0b17fc07f24d5 100644
--- a/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
+++ b/tests/baselines/reference/subtypesOfTypeParameterWithRecursiveConstraints.js
@@ -217,72 +217,63 @@ var M1;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D1;
     }(Base));
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D2;
     }(Base));
     var D3 = (function (_super) {
         __extends(D3, _super);
         function D3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D3;
     }(Base));
     var D4 = (function (_super) {
         __extends(D4, _super);
         function D4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D4;
     }(Base));
     var D5 = (function (_super) {
         __extends(D5, _super);
         function D5() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D5;
     }(Base));
     var D6 = (function (_super) {
         __extends(D6, _super);
         function D6() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D6;
     }(Base));
     var D7 = (function (_super) {
         __extends(D7, _super);
         function D7() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D7;
     }(Base));
     var D8 = (function (_super) {
         __extends(D8, _super);
         function D8() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D8;
     }(Base));
     var D9 = (function (_super) {
         __extends(D9, _super);
         function D9() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D9;
     }(Base));
@@ -297,72 +288,63 @@ var M2;
     var D1 = (function (_super) {
         __extends(D1, _super);
         function D1() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D1;
     }(Base2));
     var D2 = (function (_super) {
         __extends(D2, _super);
         function D2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D2;
     }(Base2));
     var D3 = (function (_super) {
         __extends(D3, _super);
         function D3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D3;
     }(Base2));
     var D4 = (function (_super) {
         __extends(D4, _super);
         function D4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D4;
     }(Base2));
     var D5 = (function (_super) {
         __extends(D5, _super);
         function D5() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D5;
     }(Base2));
     var D6 = (function (_super) {
         __extends(D6, _super);
         function D6() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D6;
     }(Base2));
     var D7 = (function (_super) {
         __extends(D7, _super);
         function D7() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D7;
     }(Base2));
     var D8 = (function (_super) {
         __extends(D8, _super);
         function D8() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D8;
     }(Base2));
     var D9 = (function (_super) {
         __extends(D9, _super);
         function D9() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return D9;
     }(Base2));
diff --git a/tests/baselines/reference/subtypingTransitivity.js b/tests/baselines/reference/subtypingTransitivity.js
index 9ba7ac52df58a..9c4c90117589e 100644
--- a/tests/baselines/reference/subtypingTransitivity.js
+++ b/tests/baselines/reference/subtypingTransitivity.js
@@ -33,16 +33,14 @@ var B = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(B));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(B));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures2.js b/tests/baselines/reference/subtypingWithCallSignatures2.js
index d4cd66a5e0a41..843a727c33e6b 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures2.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures2.js
@@ -187,24 +187,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures3.js b/tests/baselines/reference/subtypingWithCallSignatures3.js
index 93b1cbebd0aad..a9e7d01aab661 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures3.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures3.js
@@ -136,24 +136,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/subtypingWithCallSignatures4.js b/tests/baselines/reference/subtypingWithCallSignatures4.js
index 5cab9f1e7c483..94f549c62c18a 100644
--- a/tests/baselines/reference/subtypingWithCallSignatures4.js
+++ b/tests/baselines/reference/subtypingWithCallSignatures4.js
@@ -126,24 +126,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures2.js b/tests/baselines/reference/subtypingWithConstructSignatures2.js
index ec551f5f58cbf..1d12aeb945f73 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures2.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures2.js
@@ -187,24 +187,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures3.js b/tests/baselines/reference/subtypingWithConstructSignatures3.js
index ba833c31e7a60..78582304cb8e5 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures3.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures3.js
@@ -138,24 +138,21 @@ var Errors;
     var Derived = (function (_super) {
         __extends(Derived, _super);
         function Derived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived;
     }(Base));
     var Derived2 = (function (_super) {
         __extends(Derived2, _super);
         function Derived2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Derived2;
     }(Derived));
     var OtherDerived = (function (_super) {
         __extends(OtherDerived, _super);
         function OtherDerived() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return OtherDerived;
     }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures4.js b/tests/baselines/reference/subtypingWithConstructSignatures4.js
index 0b624fcbc51ad..17252fdb809df 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures4.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures4.js
@@ -126,24 +126,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures5.js b/tests/baselines/reference/subtypingWithConstructSignatures5.js
index 3d2d4d50d6e91..a0561606393ca 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures5.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures5.js
@@ -64,24 +64,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithConstructSignatures6.js b/tests/baselines/reference/subtypingWithConstructSignatures6.js
index 1cec204ff877e..c508781e089bf 100644
--- a/tests/baselines/reference/subtypingWithConstructSignatures6.js
+++ b/tests/baselines/reference/subtypingWithConstructSignatures6.js
@@ -67,24 +67,21 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
 var OtherDerived = (function (_super) {
     __extends(OtherDerived, _super);
     function OtherDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return OtherDerived;
 }(Base));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer.js b/tests/baselines/reference/subtypingWithNumericIndexer.js
index 2aa4d834395a4..3cf75dd83fd78 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer.js
@@ -54,16 +54,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A));
@@ -77,32 +75,28 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B4;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer3.js b/tests/baselines/reference/subtypingWithNumericIndexer3.js
index 60f463546c856..e9e8d39bf3c28 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer3.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer3.js
@@ -58,16 +58,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A));
@@ -81,40 +79,35 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B4;
     }(A));
     var B5 = (function (_super) {
         __extends(B5, _super);
         function B5() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B5;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithNumericIndexer4.js b/tests/baselines/reference/subtypingWithNumericIndexer4.js
index f40804bd55f0f..798e775083fa2 100644
--- a/tests/baselines/reference/subtypingWithNumericIndexer4.js
+++ b/tests/baselines/reference/subtypingWithNumericIndexer4.js
@@ -42,8 +42,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -57,16 +56,14 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithObjectMembers.js b/tests/baselines/reference/subtypingWithObjectMembers.js
index 420be798293c0..3675ed6a41051 100644
--- a/tests/baselines/reference/subtypingWithObjectMembers.js
+++ b/tests/baselines/reference/subtypingWithObjectMembers.js
@@ -81,16 +81,14 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Derived));
@@ -104,8 +102,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -117,8 +114,7 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A2));
@@ -130,8 +126,7 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B3;
 }(A3));
@@ -145,8 +140,7 @@ var TwoLevels;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
@@ -158,8 +152,7 @@ var TwoLevels;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A2));
@@ -171,8 +164,7 @@ var TwoLevels;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembers4.js b/tests/baselines/reference/subtypingWithObjectMembers4.js
index 0bb50afe98540..404b6cbe98857 100644
--- a/tests/baselines/reference/subtypingWithObjectMembers4.js
+++ b/tests/baselines/reference/subtypingWithObjectMembers4.js
@@ -48,8 +48,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -61,8 +60,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -74,8 +72,7 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A2));
@@ -87,8 +84,7 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js b/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
index ec3b8382ecab1..8b168ea73b5cf 100644
--- a/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
+++ b/tests/baselines/reference/subtypingWithObjectMembersAccessibility.js
@@ -48,8 +48,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -61,8 +60,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -74,8 +72,7 @@ var A2 = (function () {
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A2));
@@ -87,8 +84,7 @@ var A3 = (function () {
 var B3 = (function (_super) {
     __extends(B3, _super);
     function B3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B3;
 }(A3));
diff --git a/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js b/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
index 24f36819ff655..0a83b760218d0 100644
--- a/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
+++ b/tests/baselines/reference/subtypingWithObjectMembersAccessibility2.js
@@ -76,8 +76,7 @@ var Base = (function () {
 var Derived = (function (_super) {
     __extends(Derived, _super);
     function Derived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived;
 }(Base));
@@ -91,8 +90,7 @@ var ExplicitPublic;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
@@ -104,8 +102,7 @@ var ExplicitPublic;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A2));
@@ -117,8 +114,7 @@ var ExplicitPublic;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A3));
@@ -133,8 +129,7 @@ var ImplicitPublic;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
@@ -146,8 +141,7 @@ var ImplicitPublic;
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A2));
@@ -159,8 +153,7 @@ var ImplicitPublic;
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A3));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer.js b/tests/baselines/reference/subtypingWithStringIndexer.js
index 95a71a018d162..195b7d2192e87 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer.js
@@ -55,16 +55,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A));
@@ -78,32 +76,28 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B4;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer3.js b/tests/baselines/reference/subtypingWithStringIndexer3.js
index fd9b400cb3da8..0b2a57324ebe2 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer3.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer3.js
@@ -58,16 +58,14 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
 var B2 = (function (_super) {
     __extends(B2, _super);
     function B2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B2;
 }(A));
@@ -81,40 +79,35 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B2 = (function (_super) {
         __extends(B2, _super);
         function B2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B2;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
     var B4 = (function (_super) {
         __extends(B4, _super);
         function B4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B4;
     }(A));
     var B5 = (function (_super) {
         __extends(B5, _super);
         function B5() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B5;
     }(A));
diff --git a/tests/baselines/reference/subtypingWithStringIndexer4.js b/tests/baselines/reference/subtypingWithStringIndexer4.js
index 46178d1dc321a..2937261ad0510 100644
--- a/tests/baselines/reference/subtypingWithStringIndexer4.js
+++ b/tests/baselines/reference/subtypingWithStringIndexer4.js
@@ -42,8 +42,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return B;
 }(A));
@@ -57,16 +56,14 @@ var Generics;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(A));
     var B3 = (function (_super) {
         __extends(B3, _super);
         function B3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B3;
     }(A));
diff --git a/tests/baselines/reference/super.js b/tests/baselines/reference/super.js
index 54afddcc11913..504e8542d4d9e 100644
--- a/tests/baselines/reference/super.js
+++ b/tests/baselines/reference/super.js
@@ -58,8 +58,7 @@ var Base = (function () {
 var Sub1 = (function (_super) {
     __extends(Sub1, _super);
     function Sub1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Sub1.prototype.foo = function () {
         return "sub1" + _super.prototype.foo.call(this) + _super.prototype.bar.call(this);
@@ -69,8 +68,7 @@ var Sub1 = (function (_super) {
 var SubSub1 = (function (_super) {
     __extends(SubSub1, _super);
     function SubSub1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubSub1.prototype.foo = function () {
         return "subsub1" + _super.prototype.foo.call(this);
diff --git a/tests/baselines/reference/super1.js b/tests/baselines/reference/super1.js
index 8ef621cdf2b51..9f1289dce554c 100644
--- a/tests/baselines/reference/super1.js
+++ b/tests/baselines/reference/super1.js
@@ -84,8 +84,7 @@ var Base1 = (function () {
 var Sub1 = (function (_super) {
     __extends(Sub1, _super);
     function Sub1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Sub1.prototype.bar = function () {
         return "base";
@@ -95,8 +94,7 @@ var Sub1 = (function (_super) {
 var SubSub1 = (function (_super) {
     __extends(SubSub1, _super);
     function SubSub1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubSub1.prototype.bar = function () {
         return _super.prototype.super.foo;
@@ -115,8 +113,7 @@ var Base2 = (function () {
 var SubE2 = (function (_super) {
     __extends(SubE2, _super);
     function SubE2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubE2.prototype.bar = function () {
         return _super.prototype.prototype.foo = null;
@@ -135,8 +132,7 @@ var Base3 = (function () {
 var SubE3 = (function (_super) {
     __extends(SubE3, _super);
     function SubE3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubE3.prototype.bar = function () {
         return _super.prototype.bar.call(this);
@@ -157,8 +153,7 @@ var Base4;
     var SubSub4 = (function (_super) {
         __extends(SubSub4, _super);
         function SubSub4() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         SubSub4.prototype.x = function () {
             return _super.prototype.x.call(this);
diff --git a/tests/baselines/reference/super2.js b/tests/baselines/reference/super2.js
index 80e26c36f7c89..1d2331052db1a 100644
--- a/tests/baselines/reference/super2.js
+++ b/tests/baselines/reference/super2.js
@@ -71,8 +71,7 @@ var Base5 = (function () {
 var Sub5 = (function (_super) {
     __extends(Sub5, _super);
     function Sub5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Sub5.prototype.x = function () {
         return "SubX";
@@ -82,8 +81,7 @@ var Sub5 = (function (_super) {
 var SubSub5 = (function (_super) {
     __extends(SubSub5, _super);
     function SubSub5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubSub5.prototype.x = function () {
         return _super.prototype.x.call(this);
@@ -105,8 +103,7 @@ var Base6 = (function () {
 var Sub6 = (function (_super) {
     __extends(Sub6, _super);
     function Sub6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Sub6.prototype.y = function () {
         return "SubY";
@@ -116,8 +113,7 @@ var Sub6 = (function (_super) {
 var SubSub6 = (function (_super) {
     __extends(SubSub6, _super);
     function SubSub6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SubSub6.prototype.y = function () {
         return _super.prototype.y.call(this);
diff --git a/tests/baselines/reference/superAccess.js b/tests/baselines/reference/superAccess.js
index 8c9d93f3a36a2..0bd9d305d2eaf 100644
--- a/tests/baselines/reference/superAccess.js
+++ b/tests/baselines/reference/superAccess.js
@@ -30,8 +30,7 @@ MyBase.S1 = 5;
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MyDerived.prototype.foo = function () {
         var l3 = _super.prototype.S1; // Expected => Error: Only public instance methods of the base class are accessible via the 'super' keyword
diff --git a/tests/baselines/reference/superAccessInFatArrow1.js b/tests/baselines/reference/superAccessInFatArrow1.js
index be97707b12a55..a7f964309f736 100644
--- a/tests/baselines/reference/superAccessInFatArrow1.js
+++ b/tests/baselines/reference/superAccessInFatArrow1.js
@@ -34,8 +34,7 @@ var test;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         B.prototype.bar = function (callback) {
         };
diff --git a/tests/baselines/reference/superCallInStaticMethod.js b/tests/baselines/reference/superCallInStaticMethod.js
index 6cf9f79e7a413..b31110fdf7896 100644
--- a/tests/baselines/reference/superCallInStaticMethod.js
+++ b/tests/baselines/reference/superCallInStaticMethod.js
@@ -62,8 +62,7 @@ var Doing = (function () {
 var Other = (function (_super) {
     __extends(Other, _super);
     function Other() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     // in static method
     Other.staticMethod = function () {
diff --git a/tests/baselines/reference/superCallWithMissingBaseClass.js b/tests/baselines/reference/superCallWithMissingBaseClass.js
index 561b7300fe428..16f1108864006 100644
--- a/tests/baselines/reference/superCallWithMissingBaseClass.js
+++ b/tests/baselines/reference/superCallWithMissingBaseClass.js
@@ -18,8 +18,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var Foo = (function (_super) {
     __extends(Foo, _super);
     function Foo() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Foo.prototype.m1 = function () {
         return _super.prototype.m1.call(this);
diff --git a/tests/baselines/reference/superInCatchBlock1.js b/tests/baselines/reference/superInCatchBlock1.js
index 9eb7df62c1ab9..e1fc0f970244d 100644
--- a/tests/baselines/reference/superInCatchBlock1.js
+++ b/tests/baselines/reference/superInCatchBlock1.js
@@ -28,8 +28,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.m = function () {
         try {
diff --git a/tests/baselines/reference/superInObjectLiterals_ES5.js b/tests/baselines/reference/superInObjectLiterals_ES5.js
index adeda5835cb83..816277e4e9eb6 100644
--- a/tests/baselines/reference/superInObjectLiterals_ES5.js
+++ b/tests/baselines/reference/superInObjectLiterals_ES5.js
@@ -100,8 +100,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.f = function () {
         var _this = this;
diff --git a/tests/baselines/reference/superPropertyAccess.js b/tests/baselines/reference/superPropertyAccess.js
index b1377eb9cde35..7b5823e598b31 100644
--- a/tests/baselines/reference/superPropertyAccess.js
+++ b/tests/baselines/reference/superPropertyAccess.js
@@ -61,8 +61,7 @@ var MyBase = (function () {
 var MyDerived = (function (_super) {
     __extends(MyDerived, _super);
     function MyDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MyDerived.prototype.foo = function () {
         _super.prototype.m1.call(this, "hi"); // Should be allowed, method on base prototype
diff --git a/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js b/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
index 1397a0748ae5e..956bce4ef2eb6 100644
--- a/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
+++ b/tests/baselines/reference/superPropertyAccessInComputedPropertiesOfNestedType_ES5.js
@@ -29,8 +29,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     B.prototype.foo = function () { return 2; };
     B.prototype.bar = function () {
diff --git a/tests/baselines/reference/superPropertyAccess_ES5.js b/tests/baselines/reference/superPropertyAccess_ES5.js
index 4e817b7bbf1c5..45c32076be960 100644
--- a/tests/baselines/reference/superPropertyAccess_ES5.js
+++ b/tests/baselines/reference/superPropertyAccess_ES5.js
@@ -72,8 +72,7 @@ var A = (function () {
 var B = (function (_super) {
     __extends(B, _super);
     function B() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Object.defineProperty(B.prototype, "property", {
         set: function (value) {
diff --git a/tests/baselines/reference/superSymbolIndexedAccess5.js b/tests/baselines/reference/superSymbolIndexedAccess5.js
index 0796c912d8cfa..dd37deb5af31d 100644
--- a/tests/baselines/reference/superSymbolIndexedAccess5.js
+++ b/tests/baselines/reference/superSymbolIndexedAccess5.js
@@ -31,8 +31,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Bar.prototype[symbol] = function () {
         return _super.prototype[symbol].call(this);
diff --git a/tests/baselines/reference/superSymbolIndexedAccess6.js b/tests/baselines/reference/superSymbolIndexedAccess6.js
index ee376cec2cb27..8c8534b428ab9 100644
--- a/tests/baselines/reference/superSymbolIndexedAccess6.js
+++ b/tests/baselines/reference/superSymbolIndexedAccess6.js
@@ -31,8 +31,7 @@ var Foo = (function () {
 var Bar = (function (_super) {
     __extends(Bar, _super);
     function Bar() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Bar[symbol] = function () {
         return _super[symbol].call(this);
diff --git a/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js b/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
index ed71cebe3c78a..6815b71ce117d 100644
--- a/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
+++ b/tests/baselines/reference/super_inside-object-literal-getters-and-setters.js
@@ -57,8 +57,7 @@ var F = (function () {
 var SuperObjectTest = (function (_super) {
     __extends(SuperObjectTest, _super);
     function SuperObjectTest() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     SuperObjectTest.prototype.testing = function () {
         var test = {
diff --git a/tests/baselines/reference/switchStatements.js b/tests/baselines/reference/switchStatements.js
index 7aac6cb47e0c2..2e1aecc728830 100644
--- a/tests/baselines/reference/switchStatements.js
+++ b/tests/baselines/reference/switchStatements.js
@@ -98,8 +98,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
diff --git a/tests/baselines/reference/systemModuleWithSuperClass.js b/tests/baselines/reference/systemModuleWithSuperClass.js
index 59aff947e5c06..78c09355fa006 100644
--- a/tests/baselines/reference/systemModuleWithSuperClass.js
+++ b/tests/baselines/reference/systemModuleWithSuperClass.js
@@ -49,8 +49,7 @@ System.register(["./foo"], function (exports_1, context_1) {
             Bar = (function (_super) {
                 __extends(Bar, _super);
                 function Bar() {
-                    var _this = _super.apply(this, arguments) || this;
-                    return _this;
+                    return _super.apply(this, arguments) || this;
                 }
                 return Bar;
             }(foo_1.Foo));
diff --git a/tests/baselines/reference/thisInInvalidContexts.js b/tests/baselines/reference/thisInInvalidContexts.js
index 7fcfaf9d3174d..1fc1c7346396b 100644
--- a/tests/baselines/reference/thisInInvalidContexts.js
+++ b/tests/baselines/reference/thisInInvalidContexts.js
@@ -97,8 +97,7 @@ genericFunc(undefined); // Should be an error
 var ErrClass3 = (function (_super) {
     __extends(ErrClass3, _super);
     function ErrClass3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ErrClass3;
 }(this));
diff --git a/tests/baselines/reference/thisInInvalidContextsExternalModule.js b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
index 546863b52165a..f8cb6d695dcce 100644
--- a/tests/baselines/reference/thisInInvalidContextsExternalModule.js
+++ b/tests/baselines/reference/thisInInvalidContextsExternalModule.js
@@ -98,8 +98,7 @@ genericFunc(undefined); // Should be an error
 var ErrClass3 = (function (_super) {
     __extends(ErrClass3, _super);
     function ErrClass3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return ErrClass3;
 }(this));
diff --git a/tests/baselines/reference/thisTypeInFunctions.js b/tests/baselines/reference/thisTypeInFunctions.js
index 6eaaed5c497ec..6400f410a0926 100644
--- a/tests/baselines/reference/thisTypeInFunctions.js
+++ b/tests/baselines/reference/thisTypeInFunctions.js
@@ -227,8 +227,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D;
 }(C));
@@ -337,8 +336,7 @@ var Base1 = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base1));
@@ -352,8 +350,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/thisTypeInFunctionsNegative.js b/tests/baselines/reference/thisTypeInFunctionsNegative.js
index 08e12f49dca76..446bc15e6d9da 100644
--- a/tests/baselines/reference/thisTypeInFunctionsNegative.js
+++ b/tests/baselines/reference/thisTypeInFunctionsNegative.js
@@ -296,8 +296,7 @@ var Base1 = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base1));
@@ -311,8 +310,7 @@ var Base2 = (function () {
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base2));
diff --git a/tests/baselines/reference/tsxExternalModuleEmit1.js b/tests/baselines/reference/tsxExternalModuleEmit1.js
index 0f6b8716ed012..58e7f1c8d856e 100644
--- a/tests/baselines/reference/tsxExternalModuleEmit1.js
+++ b/tests/baselines/reference/tsxExternalModuleEmit1.js
@@ -42,8 +42,7 @@ var React = require("react");
 var Button = (function (_super) {
     __extends(Button, _super);
     function Button() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     Button.prototype.render = function () {
         return <button>Some button</button>;
@@ -64,8 +63,7 @@ var button_1 = require("./button");
 var App = (function (_super) {
     __extends(App, _super);
     function App() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     App.prototype.render = function () {
         return <button_1.Button />;
diff --git a/tests/baselines/reference/tsxStatelessFunctionComponents2.js b/tests/baselines/reference/tsxStatelessFunctionComponents2.js
index f7ac96cff1f8c..88d917235012b 100644
--- a/tests/baselines/reference/tsxStatelessFunctionComponents2.js
+++ b/tests/baselines/reference/tsxStatelessFunctionComponents2.js
@@ -52,8 +52,7 @@ function Greet(x) {
 var BigGreeter = (function (_super) {
     __extends(BigGreeter, _super);
     function BigGreeter() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     BigGreeter.prototype.render = function () {
         return <div></div>;
diff --git a/tests/baselines/reference/tsxUnionTypeComponent1.js b/tests/baselines/reference/tsxUnionTypeComponent1.js
index 56a6896f05277..3520b5af3720a 100644
--- a/tests/baselines/reference/tsxUnionTypeComponent1.js
+++ b/tests/baselines/reference/tsxUnionTypeComponent1.js
@@ -35,8 +35,7 @@ var React = require("react");
 var MyComponent = (function (_super) {
     __extends(MyComponent, _super);
     function MyComponent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MyComponent.prototype.render = function () {
         var AnyComponent = this.props.AnyComponent;
@@ -50,8 +49,7 @@ React.createElement(MyComponent, { AnyComponent: function () { return React.crea
 var MyButtonComponent = (function (_super) {
     __extends(MyButtonComponent, _super);
     function MyButtonComponent() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return MyButtonComponent;
 }(React.Component));
diff --git a/tests/baselines/reference/typeAssertions.js b/tests/baselines/reference/typeAssertions.js
index 083cb5e94b391..a57fb222a77c0 100644
--- a/tests/baselines/reference/typeAssertions.js
+++ b/tests/baselines/reference/typeAssertions.js
@@ -74,8 +74,7 @@ var SomeBase = (function () {
 var SomeDerived = (function (_super) {
     __extends(SomeDerived, _super);
     function SomeDerived() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return SomeDerived;
 }(SomeBase));
diff --git a/tests/baselines/reference/typeGuardFunction.js b/tests/baselines/reference/typeGuardFunction.js
index 45bf0853b138a..b88d1038969d2 100644
--- a/tests/baselines/reference/typeGuardFunction.js
+++ b/tests/baselines/reference/typeGuardFunction.js
@@ -102,8 +102,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionErrors.js b/tests/baselines/reference/typeGuardFunctionErrors.js
index 727640ee8af7f..6f0880ad7f59a 100644
--- a/tests/baselines/reference/typeGuardFunctionErrors.js
+++ b/tests/baselines/reference/typeGuardFunctionErrors.js
@@ -164,8 +164,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionGenerics.js b/tests/baselines/reference/typeGuardFunctionGenerics.js
index dad77edf2329b..703c809274fc7 100644
--- a/tests/baselines/reference/typeGuardFunctionGenerics.js
+++ b/tests/baselines/reference/typeGuardFunctionGenerics.js
@@ -52,8 +52,7 @@ var B = (function () {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(A));
diff --git a/tests/baselines/reference/typeGuardFunctionOfFormThis.js b/tests/baselines/reference/typeGuardFunctionOfFormThis.js
index eec648976c6cb..c052ea7d72b3c 100644
--- a/tests/baselines/reference/typeGuardFunctionOfFormThis.js
+++ b/tests/baselines/reference/typeGuardFunctionOfFormThis.js
@@ -161,8 +161,7 @@ var RoyalGuard = (function () {
 var LeadGuard = (function (_super) {
     __extends(LeadGuard, _super);
     function LeadGuard() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     LeadGuard.prototype.lead = function () { };
     ;
@@ -171,8 +170,7 @@ var LeadGuard = (function (_super) {
 var FollowerGuard = (function (_super) {
     __extends(FollowerGuard, _super);
     function FollowerGuard() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     FollowerGuard.prototype.follow = function () { };
     ;
@@ -226,8 +224,7 @@ var ArrowGuard = (function () {
 var ArrowElite = (function (_super) {
     __extends(ArrowElite, _super);
     function ArrowElite() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     ArrowElite.prototype.defend = function () { };
     return ArrowElite;
@@ -235,8 +232,7 @@ var ArrowElite = (function (_super) {
 var ArrowMedic = (function (_super) {
     __extends(ArrowMedic, _super);
     function ArrowMedic() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     ArrowMedic.prototype.heal = function () { };
     return ArrowMedic;
@@ -270,8 +266,7 @@ var MimicGuard = (function () {
 var MimicLeader = (function (_super) {
     __extends(MimicLeader, _super);
     function MimicLeader() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MimicLeader.prototype.lead = function () { };
     return MimicLeader;
@@ -279,8 +274,7 @@ var MimicLeader = (function (_super) {
 var MimicFollower = (function (_super) {
     __extends(MimicFollower, _super);
     function MimicFollower() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MimicFollower.prototype.follow = function () { };
     return MimicFollower;
diff --git a/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js b/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
index a82d3d2527fe9..a85a207a665f7 100644
--- a/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
+++ b/tests/baselines/reference/typeGuardFunctionOfFormThisErrors.js
@@ -79,8 +79,7 @@ var RoyalGuard = (function () {
 var LeadGuard = (function (_super) {
     __extends(LeadGuard, _super);
     function LeadGuard() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     LeadGuard.prototype.lead = function () { };
     ;
@@ -89,8 +88,7 @@ var LeadGuard = (function (_super) {
 var FollowerGuard = (function (_super) {
     __extends(FollowerGuard, _super);
     function FollowerGuard() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     FollowerGuard.prototype.follow = function () { };
     ;
diff --git a/tests/baselines/reference/typeGuardOfFormInstanceOf.js b/tests/baselines/reference/typeGuardOfFormInstanceOf.js
index a94d5fe93e775..a181a446a81e2 100644
--- a/tests/baselines/reference/typeGuardOfFormInstanceOf.js
+++ b/tests/baselines/reference/typeGuardOfFormInstanceOf.js
@@ -91,8 +91,7 @@ var C2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/typeGuardOfFormIsType.js b/tests/baselines/reference/typeGuardOfFormIsType.js
index 2d83a62ad3e6b..14e9259a9e781 100644
--- a/tests/baselines/reference/typeGuardOfFormIsType.js
+++ b/tests/baselines/reference/typeGuardOfFormIsType.js
@@ -56,8 +56,7 @@ var C2 = (function () {
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(C1));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMember.js b/tests/baselines/reference/typeGuardOfFormThisMember.js
index 541c03dd4b4c7..52097af34f782 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMember.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMember.js
@@ -128,8 +128,7 @@ var Test;
     var Directory = (function (_super) {
         __extends(Directory, _super);
         function Directory() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Directory;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
index b61676b40c360..c65445a3a5a80 100644
--- a/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
+++ b/tests/baselines/reference/typeGuardOfFormThisMemberErrors.js
@@ -78,8 +78,7 @@ var Test;
     var Directory = (function (_super) {
         __extends(Directory, _super);
         function Directory() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return Directory;
     }(FileSystemObject));
diff --git a/tests/baselines/reference/typeMatch2.js b/tests/baselines/reference/typeMatch2.js
index 03408c6196b0d..2cae93924bc55 100644
--- a/tests/baselines/reference/typeMatch2.js
+++ b/tests/baselines/reference/typeMatch2.js
@@ -65,8 +65,7 @@ var Animal = (function () {
 var Giraffe = (function (_super) {
     __extends(Giraffe, _super);
     function Giraffe() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Giraffe;
 }(Animal));
diff --git a/tests/baselines/reference/typeParameterAsBaseClass.js b/tests/baselines/reference/typeParameterAsBaseClass.js
index d67259304c3a8..15d1c3b396e3f 100644
--- a/tests/baselines/reference/typeParameterAsBaseClass.js
+++ b/tests/baselines/reference/typeParameterAsBaseClass.js
@@ -11,8 +11,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(T));
diff --git a/tests/baselines/reference/typeParameterAsBaseType.js b/tests/baselines/reference/typeParameterAsBaseType.js
index 24f8789a82d66..2d0962f01d77d 100644
--- a/tests/baselines/reference/typeParameterAsBaseType.js
+++ b/tests/baselines/reference/typeParameterAsBaseType.js
@@ -21,16 +21,14 @@ var __extends = (this && this.__extends) || function (d, b) {
 var C = (function (_super) {
     __extends(C, _super);
     function C() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C;
 }(T));
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(U));
diff --git a/tests/baselines/reference/typeParameterExtendingUnion1.js b/tests/baselines/reference/typeParameterExtendingUnion1.js
index 55bc51bbdbb3b..2738aa205281e 100644
--- a/tests/baselines/reference/typeParameterExtendingUnion1.js
+++ b/tests/baselines/reference/typeParameterExtendingUnion1.js
@@ -27,16 +27,14 @@ var Animal = (function () {
 var Cat = (function (_super) {
     __extends(Cat, _super);
     function Cat() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Cat;
 }(Animal));
 var Dog = (function (_super) {
     __extends(Dog, _super);
     function Dog() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Dog;
 }(Animal));
diff --git a/tests/baselines/reference/typeParameterExtendingUnion2.js b/tests/baselines/reference/typeParameterExtendingUnion2.js
index 75f62e94c679c..b3754436f2684 100644
--- a/tests/baselines/reference/typeParameterExtendingUnion2.js
+++ b/tests/baselines/reference/typeParameterExtendingUnion2.js
@@ -27,16 +27,14 @@ var Animal = (function () {
 var Cat = (function (_super) {
     __extends(Cat, _super);
     function Cat() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Cat;
 }(Animal));
 var Dog = (function (_super) {
     __extends(Dog, _super);
     function Dog() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Dog;
 }(Animal));
diff --git a/tests/baselines/reference/typeValueConflict1.js b/tests/baselines/reference/typeValueConflict1.js
index a1ecef212dae8..8711a656bf5f9 100644
--- a/tests/baselines/reference/typeValueConflict1.js
+++ b/tests/baselines/reference/typeValueConflict1.js
@@ -33,8 +33,7 @@ var M2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(M1.A));
diff --git a/tests/baselines/reference/typeValueConflict2.js b/tests/baselines/reference/typeValueConflict2.js
index a0cfeda07ecdc..7abda8110b6c6 100644
--- a/tests/baselines/reference/typeValueConflict2.js
+++ b/tests/baselines/reference/typeValueConflict2.js
@@ -40,8 +40,7 @@ var M2;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(M1.A));
@@ -52,8 +51,7 @@ var M3;
     var B = (function (_super) {
         __extends(B, _super);
         function B() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return B;
     }(M1.A));
diff --git a/tests/baselines/reference/typeofClass2.js b/tests/baselines/reference/typeofClass2.js
index b3da31103df5a..f1ec6a77b14d3 100644
--- a/tests/baselines/reference/typeofClass2.js
+++ b/tests/baselines/reference/typeofClass2.js
@@ -37,8 +37,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.baz = function (x) { };
     D.prototype.foo = function () { };
diff --git a/tests/baselines/reference/typesWithSpecializedCallSignatures.js b/tests/baselines/reference/typesWithSpecializedCallSignatures.js
index 853cb5eafd7bf..045f7b40e555c 100644
--- a/tests/baselines/reference/typesWithSpecializedCallSignatures.js
+++ b/tests/baselines/reference/typesWithSpecializedCallSignatures.js
@@ -56,16 +56,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/typesWithSpecializedConstructSignatures.js b/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
index 9931459744099..b4d42d819edb6 100644
--- a/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
+++ b/tests/baselines/reference/typesWithSpecializedConstructSignatures.js
@@ -54,16 +54,14 @@ var Base = (function () {
 var Derived1 = (function (_super) {
     __extends(Derived1, _super);
     function Derived1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived1;
 }(Base));
 var Derived2 = (function (_super) {
     __extends(Derived2, _super);
     function Derived2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return Derived2;
 }(Base));
diff --git a/tests/baselines/reference/undeclaredBase.js b/tests/baselines/reference/undeclaredBase.js
index 64117b1935a3c..4b7813231cf86 100644
--- a/tests/baselines/reference/undeclaredBase.js
+++ b/tests/baselines/reference/undeclaredBase.js
@@ -14,8 +14,7 @@ var M;
     var C = (function (_super) {
         __extends(C, _super);
         function C() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return C;
     }(M.I));
diff --git a/tests/baselines/reference/undefinedIsSubtypeOfEverything.js b/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
index 451aec91affe6..86948a2d9e668 100644
--- a/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
+++ b/tests/baselines/reference/undefinedIsSubtypeOfEverything.js
@@ -136,120 +136,105 @@ var Base = (function () {
 var D0 = (function (_super) {
     __extends(D0, _super);
     function D0() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D0;
 }(Base));
 var DA = (function (_super) {
     __extends(DA, _super);
     function DA() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return DA;
 }(Base));
 var D1 = (function (_super) {
     __extends(D1, _super);
     function D1() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1;
 }(Base));
 var D1A = (function (_super) {
     __extends(D1A, _super);
     function D1A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D1A;
 }(Base));
 var D2 = (function (_super) {
     __extends(D2, _super);
     function D2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2;
 }(Base));
 var D2A = (function (_super) {
     __extends(D2A, _super);
     function D2A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D2A;
 }(Base));
 var D3 = (function (_super) {
     __extends(D3, _super);
     function D3() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D3;
 }(Base));
 var D3A = (function (_super) {
     __extends(D3A, _super);
     function D3A() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D3A;
 }(Base));
 var D4 = (function (_super) {
     __extends(D4, _super);
     function D4() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D4;
 }(Base));
 var D5 = (function (_super) {
     __extends(D5, _super);
     function D5() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D5;
 }(Base));
 var D6 = (function (_super) {
     __extends(D6, _super);
     function D6() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D6;
 }(Base));
 var D7 = (function (_super) {
     __extends(D7, _super);
     function D7() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D7;
 }(Base));
 var D8 = (function (_super) {
     __extends(D8, _super);
     function D8() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D8;
 }(Base));
 var D9 = (function (_super) {
     __extends(D9, _super);
     function D9() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D9;
 }(Base));
 var D10 = (function (_super) {
     __extends(D10, _super);
     function D10() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D10;
 }(Base));
@@ -260,8 +245,7 @@ var E;
 var D11 = (function (_super) {
     __extends(D11, _super);
     function D11() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D11;
 }(Base));
@@ -273,8 +257,7 @@ var f;
 var D12 = (function (_super) {
     __extends(D12, _super);
     function D12() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D12;
 }(Base));
@@ -290,24 +273,21 @@ var c;
 var D13 = (function (_super) {
     __extends(D13, _super);
     function D13() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D13;
 }(Base));
 var D14 = (function (_super) {
     __extends(D14, _super);
     function D14() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D14;
 }(Base));
 var D15 = (function (_super) {
     __extends(D15, _super);
     function D15() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D15;
 }(Base));
@@ -317,16 +297,14 @@ var D15 = (function (_super) {
 var D16 = (function (_super) {
     __extends(D16, _super);
     function D16() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D16;
 }(Base));
 var D17 = (function (_super) {
     __extends(D17, _super);
     function D17() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return D17;
 }(Base));
diff --git a/tests/baselines/reference/underscoreMapFirst.js b/tests/baselines/reference/underscoreMapFirst.js
index 61f1bf2c9f9b6..c8e936af5277f 100644
--- a/tests/baselines/reference/underscoreMapFirst.js
+++ b/tests/baselines/reference/underscoreMapFirst.js
@@ -57,8 +57,7 @@ var __extends = (this && this.__extends) || function (d, b) {
 var MyView = (function (_super) {
     __extends(MyView, _super);
     function MyView() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     MyView.prototype.getDataSeries = function () {
         var data = this.model.get("data");
diff --git a/tests/baselines/reference/unionTypeEquivalence.js b/tests/baselines/reference/unionTypeEquivalence.js
index b0be82122de83..e4d0acc893cc0 100644
--- a/tests/baselines/reference/unionTypeEquivalence.js
+++ b/tests/baselines/reference/unionTypeEquivalence.js
@@ -34,8 +34,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo = function () { };
     return D;
diff --git a/tests/baselines/reference/unionTypeFromArrayLiteral.js b/tests/baselines/reference/unionTypeFromArrayLiteral.js
index 72cf61f72fd88..83ad2a343946b 100644
--- a/tests/baselines/reference/unionTypeFromArrayLiteral.js
+++ b/tests/baselines/reference/unionTypeFromArrayLiteral.js
@@ -54,8 +54,7 @@ var D = (function () {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo3 = function () { };
     return E;
@@ -63,8 +62,7 @@ var E = (function (_super) {
 var F = (function (_super) {
     __extends(F, _super);
     function F() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     F.prototype.foo4 = function () { };
     return F;
diff --git a/tests/baselines/reference/unionTypesAssignability.js b/tests/baselines/reference/unionTypesAssignability.js
index fafc4ec85fa99..231b8b27f3ba6 100644
--- a/tests/baselines/reference/unionTypesAssignability.js
+++ b/tests/baselines/reference/unionTypesAssignability.js
@@ -88,8 +88,7 @@ var C = (function () {
 var D = (function (_super) {
     __extends(D, _super);
     function D() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     D.prototype.foo1 = function () { };
     return D;
@@ -97,8 +96,7 @@ var D = (function (_super) {
 var E = (function (_super) {
     __extends(E, _super);
     function E() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     E.prototype.foo2 = function () { };
     return E;
diff --git a/tests/baselines/reference/unspecializedConstraints.js b/tests/baselines/reference/unspecializedConstraints.js
index 7d5a4b9deedf2..1343bea602e39 100644
--- a/tests/baselines/reference/unspecializedConstraints.js
+++ b/tests/baselines/reference/unspecializedConstraints.js
@@ -169,8 +169,7 @@ var ts;
     var Type = (function (_super) {
         __extends(Type, _super);
         function Type() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         Type.prototype.equals = function (that) {
             if (this === that)
diff --git a/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js b/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
index 324dc784b67f4..b82a7cbc0ae9e 100644
--- a/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
+++ b/tests/baselines/reference/untypedFunctionCallsWithTypeParameters1.js
@@ -70,8 +70,7 @@ var r4 = c2(); // should be an error
 var C2 = (function (_super) {
     __extends(C2, _super);
     function C2() {
-        var _this = _super.apply(this, arguments) || this;
-        return _this;
+        return _super.apply(this, arguments) || this;
     }
     return C2;
 }(Function)); // error
diff --git a/tests/baselines/reference/unusedClassesinNamespace4.js b/tests/baselines/reference/unusedClassesinNamespace4.js
index 3c1dd16874e5e..0ab1227bf3d04 100644
--- a/tests/baselines/reference/unusedClassesinNamespace4.js
+++ b/tests/baselines/reference/unusedClassesinNamespace4.js
@@ -36,8 +36,7 @@ var Validation;
     var c3 = (function (_super) {
         __extends(c3, _super);
         function c3() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return c3;
     }(c1));
diff --git a/tests/baselines/reference/unusedIdentifiersConsolidated1.js b/tests/baselines/reference/unusedIdentifiersConsolidated1.js
index fd7d859ac3710..dbb261e5f2a03 100644
--- a/tests/baselines/reference/unusedIdentifiersConsolidated1.js
+++ b/tests/baselines/reference/unusedIdentifiersConsolidated1.js
@@ -168,8 +168,7 @@ var Greeter;
     var class2 = (function (_super) {
         __extends(class2, _super);
         function class2() {
-            var _this = _super.apply(this, arguments) || this;
-            return _this;
+            return _super.apply(this, arguments) || this;
         }
         return class2;
     }(class1));

From e0c35f2c829079a00f73bcc9ff4abd671578c26e Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:17:11 -0700
Subject: [PATCH 35/39] Restore arrow function.

---
 src/compiler/transformers/es6.ts | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index ed5659e8a3f56..df21df5e1fbe2 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -224,7 +224,7 @@ namespace ts {
                 : visitorWorker(node);
         }
 
-        function saveStateAndInvoke<T>(node: Node, f: (node: Node) => T): T {
+        function saveStateAndInvoke<T extends Node, U>(node: T, f: (node: T) => U): U {
             const savedEnclosingFunction = enclosingFunction;
             const savedEnclosingNonArrowFunction = enclosingNonArrowFunction;
             const savedEnclosingNonAsyncFunctionBody = enclosingNonAsyncFunctionBody;
@@ -867,7 +867,7 @@ namespace ts {
             }
 
             if (constructor) {
-                const body = saveStateAndInvoke(constructor, makeTransformerForConstructorBodyAtOffset(statementOffset));
+                const body = saveStateAndInvoke(constructor, constructor => visitNodes(constructor.body.statements, visitor, isStatement, /*start*/ statementOffset));
                 addRange(statements, body);
             }
 
@@ -900,10 +900,6 @@ namespace ts {
             return block;
         }
 
-        function makeTransformerForConstructorBodyAtOffset(offset: number): (c: ConstructorDeclaration) => NodeArray<Statement> {
-            return constructor => visitNodes(constructor.body.statements, visitor, isStatement, /*start*/ offset);
-        }
-
         /**
          * We want to try to avoid emitting a return statement in certain cases if a user already returned something.
          * It would be pointless and generate dead code, so we'll try to make things a little bit prettier

From f8fbc22ef23e7c4bc5c2b75af30fb532d2208cb6 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:35:57 -0700
Subject: [PATCH 36/39] Reuse the 'captureThisForNode' function.

---
 src/compiler/transformers/es6.ts | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index df21df5e1fbe2..b0633c309eaf2 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -965,21 +965,8 @@ namespace ts {
 
                 // The constructor was generated for some reason.
                 // Create a captured '_this' variable.
-                statements.push(
-                    createVariableStatement(
-                        /*modifiers*/ undefined,
-                        createVariableDeclarationList([
-                            createVariableDeclaration(
-                                "_this",
-                                /*type*/ undefined,
-                                superReturnValueOrThis
-                            )
-                        ]),
-                    /*location*/ extendsClauseElement)
-                );
-
+                captureThisForNode(statements, constructor, superReturnValueOrThis);
                 enableSubstitutionsForCapturedThis();
-
                 return SuperCaptureResult.ReplaceSuperCapture;
             }
 

From fb4b503834456dd833b3c695a0248a228c7339cb Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:36:17 -0700
Subject: [PATCH 37/39] Removed pointlessish overloads.

---
 src/compiler/transformers/es6.ts | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index b0633c309eaf2..481857e053602 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -1290,8 +1290,6 @@ namespace ts {
             }
         }
 
-        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined): void;
-        function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined, originalStatement: Statement): void;
         function captureThisForNode(statements: Statement[], node: Node, initializer: Expression | undefined, originalStatement?: Statement): void {
             enableSubstitutionsForCapturedThis();
             const captureThisStatement = createVariableStatement(

From b5a10316851ec7943ab24ee6127178e705657f1c Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 14:41:47 -0700
Subject: [PATCH 38/39] Moved code around, fixed indent, reworded comment.

---
 src/compiler/transformers/es6.ts | 129 +++++++++++++++----------------
 1 file changed, 64 insertions(+), 65 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 481857e053602..0495e422fc327 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -161,7 +161,7 @@ namespace ts {
          * Callers should skip the current statement and avoid any returns of '_this'.
          */
         ReplaceWithReturn,
-}
+    }
 
     export function transformES6(context: TransformationContext) {
         const {
@@ -902,7 +902,7 @@ namespace ts {
 
         /**
          * We want to try to avoid emitting a return statement in certain cases if a user already returned something.
-         * It would be pointless and generate dead code, so we'll try to make things a little bit prettier
+         * It would generate obviously dead code, so we'll try to make things a little bit prettier
          * by doing a minimal check on whether some common patterns always explicitly return.
          */
         function isSufficientlyCoveredByReturnStatements(statement: Statement): boolean {
@@ -910,7 +910,6 @@ namespace ts {
             if (statement.kind === SyntaxKind.ReturnStatement) {
                 return true;
             }
-
             // An if-statement with two covered branches is covered.
             else if (statement.kind === SyntaxKind.IfStatement) {
                 const ifStatement = statement as IfStatement;
@@ -973,6 +972,68 @@ namespace ts {
             return SuperCaptureResult.NoReplacement;
         }
 
+        /**
+         * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
+         *
+         * @returns The new statement offset into the `statements` array.
+         */
+        function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, statementOffset: number) {
+            // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
+            if (!hasExtendsClause) {
+                addCaptureThisForNodeIfNeeded(statements, ctor);
+                return SuperCaptureResult.NoReplacement;
+            }
+
+            // Most of the time, a 'super' call will be the first real statement in a constructor body.
+            // In these cases, we'd like to transform these into a *single* statement instead of a declaration
+            // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
+            // we'd get:
+            //
+            //      var _this;
+            //      _this = _super.call(...) || this;
+            //
+            // instead of
+            //
+            //      var _this = _super.call(...) || this;
+            //
+            // Additionally, if the 'super()' call is the last statement, we should just avoid capturing
+            // entirely and immediately return the result like so:
+            //
+            //      return _super.call(...) || this;
+            //
+            let firstStatement: Statement;
+            let superCallExpression: Expression;
+
+            const ctorStatements = ctor.body.statements;
+            if (statementOffset < ctorStatements.length) {
+                firstStatement = ctorStatements[statementOffset];
+
+                if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
+                    const superCall = (firstStatement as ExpressionStatement).expression as CallExpression;
+                    superCallExpression = setOriginalNode(
+                        saveStateAndInvoke(superCall, visitImmediateSuperCallInBody),
+                        superCall
+                    );
+                }
+            }
+
+            // Return the result if we have an immediate super() call on the last statement.
+            if (superCallExpression && statementOffset === ctorStatements.length - 1) {
+                statements.push(createReturn(superCallExpression));
+                return SuperCaptureResult.ReplaceWithReturn;
+            }
+
+            // Perform the capture.
+            captureThisForNode(statements, ctor, superCallExpression, firstStatement);
+
+            // If we're actually replacing the original statement, we need to signal this to the caller.
+            if (superCallExpression) {
+                return SuperCaptureResult.ReplaceSuperCapture;
+            }
+
+            return SuperCaptureResult.NoReplacement;
+        }
+
         /**
          * Visits a parameter declaration.
          *
@@ -1216,68 +1277,6 @@ namespace ts {
             statements.push(forStatement);
         }
 
-        /**
-         * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
-         *
-         * @returns The new statement offset into the `statements` array.
-         */
-        function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, statementOffset: number) {
-            // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
-            if (!hasExtendsClause) {
-                addCaptureThisForNodeIfNeeded(statements, ctor);
-                return SuperCaptureResult.NoReplacement;
-            }
-
-            // Most of the time, a 'super' call will be the first real statement in a constructor body.
-            // In these cases, we'd like to transform these into a *single* statement instead of a declaration
-            // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
-            // we'd get:
-            //
-            //      var _this;
-            //      _this = _super.call(...) || this;
-            //
-            // instead of
-            //
-            //      var _this = _super.call(...) || this;
-            //
-            // Additionally, if the 'super()' call is the last statement, we should just avoid capturing
-            // entirely and immediately return the result like so:
-            //
-            //      return _super.call(...) || this;
-            //
-            let firstStatement: Statement;
-            let superCallExpression: Expression;
-
-            const ctorStatements = ctor.body.statements;
-            if (statementOffset < ctorStatements.length) {
-                firstStatement = ctorStatements[statementOffset];
-
-                if (firstStatement.kind === SyntaxKind.ExpressionStatement && isSuperCallExpression((firstStatement as ExpressionStatement).expression)) {
-                    const superCall = (firstStatement as ExpressionStatement).expression as CallExpression;
-                    superCallExpression = setOriginalNode(
-                        saveStateAndInvoke(superCall, visitImmediateSuperCallInBody),
-                        superCall
-                    );
-                }
-            }
-
-            // Return the result if we have an immediate super() call on the last statement.
-            if (superCallExpression && statementOffset === ctorStatements.length - 1) {
-                statements.push(createReturn(superCallExpression));
-                return SuperCaptureResult.ReplaceWithReturn;
-            }
-
-            // Perform the capture.
-            captureThisForNode(statements, ctor, superCallExpression, firstStatement);
-
-            // If we're actually replacing the original statement, we need to signal this to the caller.
-            if (superCallExpression) {
-                return SuperCaptureResult.ReplaceSuperCapture;
-            }
-
-            return SuperCaptureResult.NoReplacement;
-        }
-
         /**
          * Adds a statement to capture the `this` of a function declaration if it is needed.
          *

From c29ec6fe371fb4c1ff2aed13a213ead2acfc961a Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Tue, 27 Sep 2016 20:53:15 -0700
Subject: [PATCH 39/39] Consolidated 'super()' transformation logic into one
 function.

---
 src/compiler/transformers/es6.ts | 88 ++++++++++++++------------------
 1 file changed, 38 insertions(+), 50 deletions(-)

diff --git a/src/compiler/transformers/es6.ts b/src/compiler/transformers/es6.ts
index 0495e422fc327..1ed7ee9b7abf8 100644
--- a/src/compiler/transformers/es6.ts
+++ b/src/compiler/transformers/es6.ts
@@ -837,7 +837,6 @@ namespace ts {
             startLexicalEnvironment();
 
             let statementOffset = -1;
-            let superCaptureStatus = SuperCaptureResult.NoReplacement;
             if (hasSynthesizedSuper) {
                 // If a super call has already been synthesized,
                 // we're going to assume that we should just transform everything after that.
@@ -854,12 +853,9 @@ namespace ts {
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
                 Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
 
-                superCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, statementOffset);
             }
 
-            if (superCaptureStatus === SuperCaptureResult.NoReplacement) {
-                superCaptureStatus = addDefaultSuperCallIfNeeded(statements, constructor, extendsClauseElement, hasSynthesizedSuper);
-            }
+            const superCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, !!extendsClauseElement, hasSynthesizedSuper, statementOffset);
 
             // The last statement expression was replaced. Skip it.
             if (superCaptureStatus === SuperCaptureResult.ReplaceSuperCapture || superCaptureStatus === SuperCaptureResult.ReplaceWithReturn) {
@@ -929,61 +925,42 @@ namespace ts {
             return false;
         }
 
-        /**
-         * Adds a synthesized call to `_super` if it is needed.
-         *
-         * @param statements The statements for the new constructor body.
-         * @param constructor The constructor for the class.
-         * @param extendsClauseElement The expression for the class `extends` clause.
-         * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
-         *                            synthesized `super` call.
-         */
-        function addDefaultSuperCallIfNeeded(statements: Statement[], constructor: ConstructorDeclaration, extendsClauseElement: ExpressionWithTypeArguments, hasSynthesizedSuper: boolean) {
-            // If the TypeScript transformer needed to synthesize a constructor for property
-            // initializers, it would have also added a synthetic `...args` parameter and
-            // `super` call.
-            // If this is the case, or if the class has an `extends` clause but no
-            // constructor, we emit a synthesized call to `_super`.
-            if (constructor ? hasSynthesizedSuper : extendsClauseElement) {
-                const actualThis = createThis();
-                setNodeEmitFlags(actualThis, NodeEmitFlags.NoSubstitution);
-                const superCall = createFunctionApply(
-                    createIdentifier("_super"),
-                    actualThis,
-                    createIdentifier("arguments"),
-                );
-                const superReturnValueOrThis = createLogicalOr(superCall, actualThis);
-
-                if (!constructor) {
-                    // We must be here because the user didn't write a constructor
-                    // but we needed to call 'super()' anyway - but if that's the case,
-                    // we can just immediately return the result of a 'super()' call.
-                    statements.push(createReturn(superReturnValueOrThis));
-                    return SuperCaptureResult.ReplaceWithReturn;
-                }
-
-                // The constructor was generated for some reason.
-                // Create a captured '_this' variable.
-                captureThisForNode(statements, constructor, superReturnValueOrThis);
-                enableSubstitutionsForCapturedThis();
-                return SuperCaptureResult.ReplaceSuperCapture;
-            }
-
-            return SuperCaptureResult.NoReplacement;
-        }
-
         /**
          * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
          *
          * @returns The new statement offset into the `statements` array.
          */
-        function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements: Statement[], ctor: ConstructorDeclaration, hasExtendsClause: boolean, statementOffset: number) {
+        function declareOrCaptureOrReturnThisForConstructorIfNeeded(
+                    statements: Statement[],
+                    ctor: ConstructorDeclaration | undefined,
+                    hasExtendsClause: boolean,
+                    hasSynthesizedSuper: boolean,
+                    statementOffset: number) {
             // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
             if (!hasExtendsClause) {
-                addCaptureThisForNodeIfNeeded(statements, ctor);
+                if (ctor) {
+                    addCaptureThisForNodeIfNeeded(statements, ctor);
+                }
                 return SuperCaptureResult.NoReplacement;
             }
 
+            // We must be here because the user didn't write a constructor
+            // but we needed to call 'super(...args)' anyway as per 14.5.14 of the ES2016 spec.
+            // If that's the case we can just immediately return the result of a 'super()' call.
+            if (!ctor) {
+                statements.push(createReturn(createDefaultSuperCallOrThis()));
+                return SuperCaptureResult.ReplaceWithReturn;
+            }
+
+            // The constructor exists, but it and the 'super()' call it contains were generated
+            // for something like property initializers.
+            // Create a captured '_this' variable and assume it will subsequently be used.
+            if (hasSynthesizedSuper) {
+                captureThisForNode(statements, ctor, createDefaultSuperCallOrThis());
+                enableSubstitutionsForCapturedThis();
+                return SuperCaptureResult.ReplaceSuperCapture;
+            }
+
             // Most of the time, a 'super' call will be the first real statement in a constructor body.
             // In these cases, we'd like to transform these into a *single* statement instead of a declaration
             // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
@@ -1034,6 +1011,17 @@ namespace ts {
             return SuperCaptureResult.NoReplacement;
         }
 
+        function createDefaultSuperCallOrThis() {
+            const actualThis = createThis();
+            setNodeEmitFlags(actualThis, NodeEmitFlags.NoSubstitution);
+            const superCall = createFunctionApply(
+                createIdentifier("_super"),
+                actualThis,
+                createIdentifier("arguments"),
+            );
+            return createLogicalOr(superCall, actualThis);
+        }
+
         /**
          * Visits a parameter declaration.
          *