Issue 28580. Relax instantiate to bounds.

pkg/analyzer/lib/src/summary/resynthesize.dart

 // Copyright (c) 2015, 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.
 
 library summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
@@ skipping 1276 matching lines @@
       // If type arguments are specified, use them.
       // Otherwise, delay until they are requested.
       if (numTypeParameters == 0) {
         return element.type;
       } else if (numTypeArguments == numTypeParameters) {
         typeArguments = _buildTypeArguments(numTypeArguments, getTypeArgument);
       }
       InterfaceTypeImpl type =
           new InterfaceTypeImpl.elementWithNameAndArgs(element, name, () {
         if (typeArguments == null) {
-          if (libraryResynthesizer.summaryResynthesizer.strongMode &&
-              instantiateToBoundsAllowed) {
+          if (libraryResynthesizer.summaryResynthesizer.strongMode) {
             InterfaceType instantiatedToBounds = libraryResynthesizer
                 .summaryResynthesizer.context.typeSystem
                 .instantiateToBounds(element.type) as InterfaceType;
             return instantiatedToBounds.typeArguments;
           } else {
             return new List<DartType>.filled(
                 numTypeParameters, DynamicTypeImpl.instance);
           }
         }
         return typeArguments;
       });
       // Mark the type as having implicit type arguments, so that we don't
       // attempt to request them during constant expression resynthesizing.
       if (typeArguments == null) {
         libraryResynthesizer.typesWithImplicitTypeArguments.add(type);
       }
       // Done.
       return type;
     } else if (element is FunctionTypedElement) {
       if (element is FunctionTypeAliasElementHandle) {
         List<DartType> typeArguments;
         if (numTypeArguments == numTypeParameters) {
           typeArguments =
               _buildTypeArguments(numTypeArguments, getTypeArgument);
-        } else if (libraryResynthesizer.summaryResynthesizer.strongMode &&
-            instantiateToBoundsAllowed) {
+        } else if (libraryResynthesizer.summaryResynthesizer.strongMode) {
           FunctionType instantiatedToBounds = libraryResynthesizer
               .summaryResynthesizer.context.typeSystem
               .instantiateToBounds(element.type) as FunctionType;
           typeArguments = instantiatedToBounds.typeArguments;
         } else {
           typeArguments = new List<DartType>.filled(
               numTypeParameters, DynamicTypeImpl.instance);
         }
         return new FunctionTypeImpl.elementWithNameAndArgs(
             element, name, typeArguments, numTypeParameters != 0);
@@ skipping 622 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }