Allow access to super fields inside a closure.

lib/compiler/implementation/closure.dart

 // Copyright (c) 2012, 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("closureToClassMapper");
 
 #import("elements/elements.dart");
 #import("leg.dart");
 #import("scanner/scannerlib.dart");
 #import("tree/tree.dart");
@@ skipping 42 matching lines @@
 
   bool isInstanceMember() => true;
   bool isAssignable() => false;
 
   String toString() => "ClosureFieldElement($name)";
 }
 
 class ClosureClassElement extends ClassElement {
   ClosureClassElement(SourceString name,
                       Compiler compiler,
+                      this.methodElement,
                       Element enclosingElement)
       : super(name,
               enclosingElement,
               // By assigning a fresh class-id we make sure that the hashcode
               // is unique, but also emit closure classes after all other
               // classes (since the emitter sorts classes by their id).
               compiler.getNextFreeClassId(),
               STATE_DONE) {
     compiler.closureClass.ensureResolved(compiler);
     supertype = compiler.closureClass.computeType(compiler);
     interfaces = const EmptyLink<DartType>();
     allSupertypes = new Link<DartType>(supertype);
   }
+
   bool isClosure() => true;
+
+  /**
+   * The most outer method this closure is declared into.
+   */
+  Element methodElement;
 }
 
 class BoxElement extends Element {
   BoxElement(SourceString name, Element enclosingElement)
       : super(name, ElementKind.VARIABLE, enclosingElement);
 }
 
 class ThisElement extends Element {
   ThisElement(Element enclosing)
       : super(const SourceString('this'), ElementKind.PARAMETER, enclosing);
@@ skipping 301 matching lines @@
         result.add(element);
       };
     }
     scopeData.boxedLoopVariables = result;
   }
 
   ClosureClassMap globalizeClosure(FunctionExpression node, Element element) {
     SourceString closureName =
         new SourceString(compiler.namer.closureName(element));
     ClassElement globalizedElement = new ClosureClassElement(
-        closureName, compiler, element.getCompilationUnit());
+        closureName, compiler, element, element.getCompilationUnit());
     FunctionElement callElement =
         new FunctionElement.from(Namer.CLOSURE_INVOCATION_NAME,
                                  element,
                                  globalizedElement);
     globalizedElement.backendMembers =
         const EmptyLink<Element>().prepend(callElement);
     // The nested function's 'this' is the same as the one for the outer
     // function. It could be [null] if we are inside a static method.
     Element thisElement = closureData.thisElement;
     return new ClosureClassMap(element, globalizedElement,
@@ skipping 90 matching lines @@
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     bool oldInTryStatement = inTryStatement;
     inTryStatement = true;
     node.visitChildren(this);
     inTryStatement = oldInTryStatement;
   }
 }