Change TypeInference to handle super calls as direct invocations.

pkg/compiler/lib/src/inferrer/inferrer_visitor.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 inferrer_visitor;
 
 import 'dart:collection' show IterableMixin;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
@@ skipping 940 matching lines @@
     if (_thisType != null) return _thisType;
     ClassElement cls = outermostElement.enclosingClass;
     ClosedWorld closedWorld = compiler.closedWorld;
     if (closedWorld.isUsedAsMixin(cls)) {
       return _thisType = types.nonNullSubtype(cls);
     } else {
       return _thisType = types.nonNullSubclass(cls);
     }
   }
 
-  T _superType;
-  T get superType {
-    if (_superType != null) return _superType;
-    return _superType =
-        types.nonNullExact(outermostElement.enclosingClass.superclass);
-  }
-
   @override
   T visitThisGet(Identifier node, _) {
     return thisType;
   }
 
   T visitIdentifier(Identifier node) {
     if (node.isThis()) {
       return thisType;
     } else if (node.isSuper()) {
-      return superType;
+      return internalError(node, 'Unexpected expression $node.');
     } else {
       Element element = elements[node];
       if (Elements.isLocal(element)) {
         LocalElement local = element;
         return locals.use(local);
       }
       return null;
     }
   }
 
@@ skipping 496 matching lines @@
     return type;
   }
 
   T visitCascade(Cascade node) {
     // Ignore the result of the cascade send and return the type of the cascade
     // receiver.
     visit(node.expression);
     return cascadeReceiverStack.removeLast();
   }
 }