Implement complex super assignment.

sdk/lib/_internal/compiler/implementation/elements/elements.dart

Index: sdk/lib/_internal/compiler/implementation/elements/elements.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/elements/elements.dart	(revision 19425)
+++ sdk/lib/_internal/compiler/implementation/elements/elements.dart	(working copy)
@@ -759,7 +759,7 @@
   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);