Add more mixin tests and start rejecting illegal syntax.

sdk/lib/_internal/compiler/implementation/enqueue.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.
 
 part of dart2js;
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
   final CodegenEnqueuer codegen;
 
@@ skipping 180 matching lines @@
       // supertypes.
       cls.ensureResolved(compiler);
 
       void processClass(ClassElement cls) {
         if (seenClasses.contains(cls)) return;
 
         seenClasses.add(cls);
         cls.ensureResolved(compiler);
         cls.implementation.forEachMember(processInstantiatedClassMember);
         if (isResolutionQueue) {
-          compiler.resolver.checkMembers(cls);
+          compiler.resolver.checkClass(cls);
         }
 
         if (compiler.enableTypeAssertions) {
           // We need to register is checks and helpers for checking
           // assignments to fields.
           // TODO(ngeoffray): This should really move to the backend.
           cls.forEachLocalMember((Element member) {
             if (!member.isInstanceMember() || !member.isField()) return;
             DartType type = member.computeType(compiler);
             registerIsCheck(type);
@@ skipping 340 matching lines @@
     while(!queue.isEmpty) {
       // TODO(johnniwinther): Find an optimal process order for codegen.
       f(queue.removeLast());
     }
   }
 
   void _logSpecificSummary(log(message)) {
     log('Compiled ${universe.generatedCode.length} methods.');
   }
 }