Implement is-checks with typedefs for callable objects.

sdk/lib/_internal/compiler/implementation/ssa/builder.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;
 
 /**
  * A special element for the extra parameter taken by intercepted
  * methods. We need to override [Element.computeType] because our
  * optimizers may look at its declared type.
@@ skipping 2722 matching lines @@
         return;
       }
       if (type.element.isTypeVariable()) {
         // TODO(karlklose): remove this check when the backend can deal with
         // checks of the form [:o is T:] where [:T:] is a type variable.
         stack.add(graph.addConstantBool(true, constantSystem));
         return;
       }
 
       HInstruction instruction;
-      if (RuntimeTypeInformation.hasTypeArguments(type) ||
-          type.element.isTypeVariable()) {
+      if ((RuntimeTypeInformation.hasTypeArguments(type) &&
+           type.element.isClass()) || type.element.isTypeVariable()) {

[floitsch, 2012/12/07 15:30:15]

this looks too much like && (... || ...)
please break the lines differently.

[karlklose, 2012/12/11 08:40:05]

The change was actually not necessary anymore. Removed.

         HInstruction typeInfo = getRuntimeTypeInfo(expression);
         // TODO(karlklose): make isSubtype a HInstruction to enable
         // optimizations?
         Element helper = compiler.findHelper(const SourceString('isSubtype'));
         HInstruction isSubtype = new HStatic(helper);
         add(isSubtype);
         // Build a list of representations for the type arguments.
         List<HInstruction> representations =
             buildTypeArgumentRepresentations(type);
         // For each type argument, build a call to isSubtype, with the type
@@ skipping 2236 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }