Use entities in ParameterTypeInformation

pkg/compiler/lib/src/inferrer/node_tracer.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 compiler.src.inferrer.node_tracer;
 
 import '../common/names.dart' show Identifiers;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../elements/entities.dart';
@@ skipping 413 matching lines @@
   bool isParameterOfMapAddingMethod(ParameterElement element) {
     if (!element.isRegularParameter) return false;
     if (element.enclosingClass !=
         inferrer.closedWorld.commonElements.mapLiteralClass) {
       return false;
     }
     String name = element.enclosingElement.name;
     return (name == '[]=');
   }
 
-  bool isClosure(Element element) {
+  bool isClosure(MemberEntity element) {
     if (!element.isFunction) return false;
 
     /// Creating an instance of a class that implements [Function] also
     /// closurizes the corresponding [call] member. We do not currently
     /// track these, thus the check for [isClosurized] on such a method will
     /// return false. Instead we catch that case here for now.
     // TODO(herhut): Handle creation of closures from instances of Function.
     if (element.isInstanceMember && element.name == Identifiers.call) {
       return true;
     }
-    Element outermost = element.outermostEnclosingMemberOrTopLevel;
-    return outermost.declaration != element.declaration;
+    ClassEntity cls = element.enclosingClass;
+    return cls != null && cls.isClosure;
   }
 
   void visitMemberTypeInformation(MemberTypeInformation info) {
     if (info.isClosurized) {
       bailout('Returned from a closurized method');
     }
     if (isClosure(info.member)) {
       bailout('Returned from a closure');
     }
     if (info.member.isField &&
@@ skipping 15 matching lines @@
     }
     if (isParameterOfListAddingMethod(info.parameter) ||
         isParameterOfMapAddingMethod(info.parameter)) {
       // These elements are being handled in
       // [visitDynamicCallSiteTypeInformation].
       return;
     }
     addNewEscapeInformation(info);
   }
 }