Implement complex super assignment.

sdk/lib/_internal/compiler/implementation/elements/elements.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 elements;
 
 import 'dart:uri';
 
 import 'modelx.dart';
 import '../tree/tree.dart';
@@ skipping 741 matching lines @@
   /**
    * Add a synthetic nullary constructor if there are no other
    * constructors.
    */
   void addDefaultConstructorIfNeeded(Compiler compiler);
 
   void addBackendMember(Element element);
   void reverseBackendMembers();
 
   Element lookupMember(SourceString memberName);
-  Element lookupSelector(Selector selector);
+  Element lookupSelector(Selector selector, {bool superLookup});

[kasperl, 2013/03/05 07:32:36]

Maybe it's time to refactor this a bit instead? I think we should go for
something like this:

   lookupMember(Selector selector);
   lookupMemberByName(SourceString name);
   
   lookupSuperMember(Selector selector);
   lookupSuperMemberByName(SourceString name);   

and try to get rid of lookupSuperMemberInLibrary and lookupSuperInterfaceMember.
Ideally, we could also get rid of some of the ...ByName variants.

If you want to take a small step in the right direction, I would leave
lookupSelector as it is and add a lookupSuperSelector. Inside the
implementation, it would be fine to have a single method that does the lookup
and give it a mandatory boolean argument to indicate if you want to start in the
superclass.

[ngeoffray, 2013/03/05 08:46:25]

I've added a lookupSuperSelector, and an internalLookupSelector that takes an
arbitrary argument.

 
   Element lookupLocalMember(SourceString memberName);
   Element lookupBackendMember(SourceString memberName);
   Element lookupSuperMember(SourceString memberName);
 
   Element lookupSuperMemberInLibrary(SourceString memberName,
                                      LibraryElement library);
 
   Element lookupSuperInterfaceMember(SourceString memberName,
                                      LibraryElement fromLibrary);
@@ skipping 68 matching lines @@
   int get resolutionState;
   Token get beginToken;
   Token get endToken;
 
   // TODO(kasperl): Try to get rid of these.
   void set annotatedElement(Element value);
   void set resolutionState(int value);
 
   MetadataAnnotation ensureResolved(Compiler compiler);
 }