#2145. Add more local variable declaration tests (#2254)

Rename Local Variable declaration tests. Delete duplicates.

Author: sgrekhov

Language/Statements/Local_Variable_Declaration/declared_type_A01_t01.dart

@@ -0,0 +1,28 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion The declared type of a local variable with a declaration of one
+/// of the forms
+/// late? T v = e; late? final T v = e; const T v = e; is T
+///
+/// @description Checks that the declared type of a local variable with the
+/// specified type `T` is `T`
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/static_type_helper.dart';
+
+main() {
+  // We use `as dynamic` below to avoid a type promotion on an assignment
+  late num v1 = 1 as dynamic;
+  late final num v2 = 2 as dynamic;
+  num v3 = 3 as dynamic;
+  final num? v4 = 4 as dynamic;
+  const num v5 = 5 as dynamic;
+
+  v1.expectStaticType<Exactly<num>>();
+  v2.expectStaticType<Exactly<num>>();
+  v3.expectStaticType<Exactly<num>>();
+  v4.expectStaticType<Exactly<num?>>();
+  v5.expectStaticType<Exactly<num>>();
+}

Language/Statements/Local_Variable_Declaration/declared_type_A02_t01.dart

@@ -7,23 +7,40 @@
 /// as follows:
 /// • If the static type of e is Null then the declared type of v is dynamic.
 ///
-/// @description Checks that a variable declaration statement `var id;`
-/// introduces a new variable `id` with `dynamic` static type into the innermost
-/// enclosing scope.
+/// @description Checks that the variable declaration statements
+/// `late? var v = e; late? final v = e; const v = e;` introduce a new variable
+/// `v` with `dynamic` static type into the innermost enclosing scope.
 /// @author vasya
 
 import '../../../Utils/expect.dart';
 
 class C {}
 
-main() {
+test1() {
   var id;
   Expect.throws(() {
     id.whatever;
   });
   id = false;
   id = "";
   id = 2;
-  id = new C();
+  id = C();
   id = () {};
 }
+
+test2() {
+  late var id;
+  Expect.throws(() {
+    id.whatever;
+  });
+  id = false;
+  id = "";
+  id = 2;
+  id = C();
+  id = () {};
+}
+
+main() {
+  test1();
+  test2();
+}

Language/Statements/Local_Variable_Declaration/declared_type_A02_t02.dart

@@ -7,16 +7,16 @@
 /// as follows:
 /// • If the static type of e is Null then the declared type of v is dynamic.
 ///
-/// @description Checks that a variable declaration statement `var id = null;`
-/// introduces a new variable `id` with `dynamic` static type into the innermost
-/// enclosing scope.
+/// @description Checks that the variable declaration statements
+/// `late? var v = null; late? final v = null; const v = null;` introduce a new
+/// variable `v` with `dynamic` static type into the innermost enclosing scope.
 /// @author vasya
 
 import '../../../Utils/expect.dart';
 
 class C {}
 
-main() {
+test1() {
   var id = null;
   Expect.throws(() {
     id.whatever;
@@ -27,3 +27,34 @@ main() {
   id = new C();
   id = () {};
 }
+
+test2() {
+  late var id = null;
+  Expect.throws(() {
+    id.whatever;
+  });
+  id = false;
+  id = "";
+  id = 2;
+  id = new C();
+  id = () {};
+}
+
+main() {
+  late final v1 = null;
+  final v2 = null;
+  const v3 = null;
+
+  Expect.throws(() {
+    v1.whatever;
+  });
+  Expect.throws(() {
+    v2.whatever;
+  });
+  Expect.throws(() {
+    v3.whatever;
+  });
+
+  test1();
+  test2();
+}

Language/Statements/Local_Variable_Declaration/declared_type_A03_t01.dart

@@ -0,0 +1,59 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion The declared type of a local variable with a declaration of one
+/// of the forms late? var v = e; late? final v = e; const v = e; is determined
+/// as follows:
+/// ...
+/// • If the static type of e is of the form X & T where X is a type variable,
+/// the declared type of v is X. In this case v is immediately promoted to X & T
+///
+/// @description Checks that the static type of a variable declared by the
+/// statements `late? var v = e; late? final v = e;` is `X` if the static type
+/// of `e` is `X & T` where `X` is a type variable. Also test that `v` is
+/// promoted to `X & T`
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/static_type_helper.dart';
+
+test1<T>(T t) {
+  if (t is int) {
+    var v = t;
+    v.isEven;
+    T x = v;
+    v = x;
+  }
+}
+
+test2<T>(T t) {
+  if (t is int) {
+    late var v = t;
+    v.isEven;
+    T x = v;
+    v = x;
+  }
+}
+
+test3<T>(T t) {
+  if (t is int) {
+    final v = t;
+    v.isEven;
+    T x = v;
+  }
+}
+
+test4<T>(T t) {
+  if (t is int) {
+    late final v = t;
+    v.isEven;
+    T x = v;
+  }
+}
+
+main() {
+  test1<int>(1);
+  test2<num>(2);
+  test3<int>(3);
+  test4<num>(4);
+}

Language/Statements/Local_Variable_Declaration/declared_type_A03_t02.dart

@@ -0,0 +1,63 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion The declared type of a local variable with a declaration of one
+/// of the forms late? var v = e; late? final v = e; const v = e; is determined
+/// as follows:
+/// ...
+/// • If the static type of e is of the form X & T where X is a type variable,
+/// the declared type of v is X. In this case v is immediately promoted to X & T
+///
+/// @description Checks that the static type of a variable declared by the
+/// statements `late? var v = e; late? final v = e;` is `X` if the static type
+/// of `e` is where `X` is a type variable. Also check that `v` is not
+/// erroneously promoted
+/// @author sgrekhov22@gmail.com
+
+test1<T>(T t) {
+  if (t is int) {
+  }
+  var v = t;
+  v.isEven;
+//  ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+test2<T>(T t) {
+  if (t is int) {
+  }
+  late var v = t;
+  v.isEven;
+//  ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+test3<T>(T t) {
+  if (t is int) {
+  }
+  final v = t;
+  v.isEven;
+//  ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+test4<T>(T t) {
+  if (t is int) {
+  }
+  late final v = t;
+  v.isEven;
+//  ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+main() {
+  test1<int>(1);
+  test2<num>(2);
+  test3<int>(3);
+  test4<num>(4);
+}

Language/Statements/Local_Variable_Declaration/declared_type_A04_t01.dart

@@ -0,0 +1,43 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion The declared type of a local variable with a declaration of one
+/// of the forms late? var v = e; late? final v = e; const v = e; is determined
+/// as follows:
+/// ...
+/// • Otherwise, the declared type of v is the static type of e.
+///
+/// @description Checks that static type of a variable declared by the
+/// statements `late? var v = e; late? final v = e; const v = e;` is the static
+/// type of `e`
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/static_type_helper.dart';
+
+test<T>(T t) {
+  if (t is int) {
+    late final v = t;
+    v.isEven;
+    T x = v;
+  }
+}
+
+main() {
+  late var v1 = "1";
+  v1.expectStaticType<Exactly<String>>();
+
+  var v2 = 2;
+  v2.expectStaticType<Exactly<int>>();
+
+  late final v3 = 3 as num;
+  v3.expectStaticType<Exactly<num>>();
+
+  final v4 = 4 as int?;
+  v4.expectStaticType<Exactly<int?>>();
+
+  const v5 = 5 as num?;
+  v5.expectStaticType<Exactly<num?>>();
+
+  test<int>(42);
+}

Language/Statements/Local_Variable_Declaration/declared_type_A04_t02.dart

@@ -0,0 +1,30 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion The declared type of a local variable with a declaration of one
+/// of the forms late? var v = e; late? final v = e; const v = e; is determined
+/// as follows:
+/// ...
+/// • Otherwise, the declared type of v is the static type of e.
+///
+/// @description Checks that the static type of a variable declared by the
+/// statements `late? var v = e; late? final v = e; const v = e;` is the static
+/// type of `e`. Check that `v` is not erroneously promoted
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/static_type_helper.dart';
+
+test<T>(T t) {
+  if (t is int) {
+  }
+  late final v = t;
+  v.isEven;
+//  ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+main() {
+  test<num>(3.14);
+}

Language/Statements/Local_Variable_Declaration/late_await_A01_t01.dart

@@ -0,0 +1,41 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Assume that D is a local variable declaration with the modifier
+/// late that declares a variable v, which has an initializing expression e. It
+/// is a compile-time error if e contains an await expression a, unless there is
+/// a function f which is the immediately enclosing function for a, and f is not
+/// the immediately enclosing function for D.
+///
+/// @description Checks that it is a compile-time error if initializing
+/// expression of a late local variable contains an `await` expression
+/// @author sgrekhov22@gmail.com
+
+import 'dart:async';
+
+Future<T> foo<T>(T t) => Future<T>.value(t);
+
+main() async {
+  late var v1 = await Future<int>.value(1);
+//              ^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+  late final v2 = await foo<int>(2);
+//                ^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+  late String v3 = await foo<String>("3");
+//                 ^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+  late final int v4 = await Future<int>.value(4);
+//                    ^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+  return 0;
+}