Remove some warnings and errors from dart2js.

sdk/lib/_internal/compiler/implementation/ssa/optimize.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 ssa;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 189 matching lines @@
     if (operand is HConstant) {
       UnaryOperation operation = node.operation(constantSystem);
       HConstant receiver = operand;
       Constant folded = operation.fold(receiver.constant);
       if (folded != null) return graph.addConstant(folded);
     }
     return node;
   }
 
   HInstruction handleInterceptorCall(HInvokeDynamic node) {
-    if (node is !HInvokeDynamicMethod) return;
+    if (node is !HInvokeDynamicMethod) return null;

[karlklose, 2012/12/06 11:39:23]

@ngeoffray: Is this the intention?

[ngeoffray, 2012/12/06 23:05:05]

Yes, thanks Karl.

     HInstruction input = node.inputs[1];
     if (input.isString(types)
         && node.selector.name == const SourceString('toString')) {
       return node.inputs[1];
     }
     // Check if this call does not need to be intercepted.
     HType type = types[input];
     var interceptor = node.inputs[0];
     if (interceptor is !HThis && !type.canBePrimitive()) {
       // If the type can be null, and the intercepted method can be in
@@ skipping 1256 matching lines @@
     HInstruction receiver = interceptor.receiver;
     for (var user in receiver.usedBy) {
       if (user is HInterceptor && interceptor.dominates(user)) {
         user.interceptedClasses = interceptor.interceptedClasses;
       }
     }
   }
 
   // TODO(ngeoffray): Also implement it for non-intercepted calls.
 }