Take noSuchMethod into account when computing the potential targets of a call.

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 315 matching lines @@
   HInstruction visitInvokeDynamicMethod(HInvokeDynamicMethod node) {
     if (node.isInterceptedCall) {
       HInstruction folded = handleInterceptedCall(node);
       if (folded != node) return folded;
     }
 
     HType receiverType = node.getDartReceiver(compiler).instructionType;
     Selector selector = receiverType.refine(node.selector, compiler);
     Element element = compiler.world.locateSingleElement(selector);
     // TODO(ngeoffray): Also fold if it's a getter or variable.
-    if (element != null && element.isFunction()) {
+    if (element != null
+        && element.isFunction()
+        // If we found out that the only target is a [:noSuchMethod:],
+        // we just ignore it.
+        && element.name != Compiler.NO_SUCH_METHOD) {

[sra1, 2013/04/16 18:57:19]

What if I explicitly call noSuchMethod?

[ngeoffray, 2013/04/17 09:11:18]

I changed the check. Explicitly calling noSuchMethod still goes into that branch
now.

       FunctionElement method = element;
 
       if (method.isNative()) {
         HInstruction folded = tryInlineNativeMethod(node, method);
         if (folded != null) return folded;
       } else {
         // TODO(ngeoffray): If the method has optional parameters,
         // we should pass the default values.
         FunctionSignature parameters = method.computeSignature(compiler);
         if (parameters.optionalParameterCount == 0
@@ skipping 1341 matching lines @@
     HBasicBlock block = user.block;
     block.addAfter(user, interceptor);
     block.rewrite(user, interceptor);
     block.remove(user);
 
     // The interceptor will be removed in the dead code elimination
     // phase. Note that removing it here would not work because of how
     // the [visitBasicBlock] is implemented.
   }
 }