Fix the fix

weswigham · weswigham · commit 636005eee84e · 2020-10-22T16:26:04.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -17402,7 +17402,7 @@ namespace ts {
                         }
                     }
                 }
-                else if (isGenericMappedType(target)) {
+                else if (isGenericMappedType(target) && (!target.declaration.nameType || relation === comparableRelation)) {
                     // A source type T is related to a target type { [P in X]: T[P] }
                     const template = getTemplateTypeFromMappedType(target);
                     const modifiers = getMappedTypeModifiers(target);

Original file line number	Diff line number	Diff line change
`@@ -17402,7 +17402,7 @@ namespace ts {`
`17402`	`17402`	`}`
`17403`	`17403`	`}`
`17404`	`17404`	`}`
`17405`		`- else if (isGenericMappedType(target)) {`
	`17405`	`+ else if (isGenericMappedType(target) && (!target.declaration.nameType \|\| relation === comparableRelation)) {`
`17406`	`17406`	`// A source type T is related to a target type { [P in X]: T[P] }`
`17407`	`17407`	`const template = getTemplateTypeFromMappedType(target);`
`17408`	`17408`	`const modifiers = getMappedTypeModifiers(target);`