Don't cancel when naming a typedef.

frog/leg/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
   String generate(WorkItem work, HGraph graph) {
     return measure(() {
@@ skipping 969 matching lines @@
                                        || isSupertypeOfNativeClass(element))) {
         buffer.add("(");
         endParen = true;
       } else {
         beginExpression(precedence);
       }
       buffer.add('!!');
       use(input, JSPrecedence.MEMBER_PRECEDENCE);
       buffer.add('.');
       buffer.add(compiler.namer.operatorIs(node.typeExpression));
-      if (element.isNative() || isSupertypeOfNativeClass(element)) {
+      if (element.isClass() && (element.dynamic.isNative()
+                                || isSupertypeOfNativeClass(element))) {
         buffer.add(' || ');
         beginExpression(JSPrecedence.LOGICAL_AND_PRECEDENCE);
         // First check if the object is not a Dart object. If the
         // object is a Dart object, we know the property check was
         // sufficient.
         buffer.add('!');
         use(input, JSPrecedence.MEMBER_PRECEDENCE);
         buffer.add('.');
         buffer.add(compiler.namer.operatorIs(objectClass));
         buffer.add(' && ');
@@ skipping 391 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endElse(HIf node) {
     if (node.elseBlock.hasBailouts()) {
       endBailoutSwitch();
     }
   }
 }