Check function type equivalence

pkg/compiler/lib/src/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
 import '../common/resolution.dart' show Resolution, ParsingContext;
 import '../compiler.dart' show Compiler;
@@ skipping 2630 matching lines @@
             enclosing) {
     _resolvedAst = new SynthesizedResolvedAst(
         this, ResolvedAstKind.FORWARDING_CONSTRUCTOR);
   }
 
   SynthesizedConstructorElementX.forDefault(
       this.definingConstructor, Element enclosing)
       : super('', ElementKind.GENERATIVE_CONSTRUCTOR, Modifiers.EMPTY,
             enclosing) {
     functionSignature = new FunctionSignatureX(
-        type: new ResolutionFunctionType.synthesized(enclosingClass.thisType));
+        type: new ResolutionFunctionType.synthesized(
+            const ResolutionDynamicType()));
     _resolvedAst =
         new SynthesizedResolvedAst(this, ResolvedAstKind.DEFAULT_CONSTRUCTOR);
   }
 
   bool get isDefaultConstructor {
     return _resolvedAst.kind == ResolvedAstKind.DEFAULT_CONSTRUCTOR;
   }
 
   FunctionExpression parseNode(ParsingContext parsing) => null;
 
@@ skipping 939 matching lines @@
       body = node.asFunctionExpression().body;
     }
     return new ParsedResolvedAst(
         declaration,
         node,
         body,
         definingElement.treeElements,
         definingElement.compilationUnit.script.resourceUri);
   }
 }