passing and good perf

frog/var_member.dart

 // Copyright (c) 2011, 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.
 
 /** A dynamic member stub. */
 class VarMember {
   final String name;
   bool isGenerated = false;
 
   VarMember(this.name);
@@ skipping 151 matching lines @@
   }
 
   /**
    * If we have a native method overridden by a hidden native method, we need to
    * make sure the base one has an exact type test. Otherwise we don't need
    * this.
    */
   bool _needsExactTypeCheck() {
     if (member == null || member.declaringType.isObject) return false;
 
-    var members = member.declaringType.resolveMember(member.name).members;
+    var members = member.potentialMemberSet.members;
     return members.filter((m) => m != member
         && m.declaringType.isHiddenNativeType).length >= 1;
   }
 
   bool _useDirectCall(Arguments args) {
     // Create direct stubs when we can. We don't do this in some cases, such as
     // types that have native subtypes (like Object), otherwise things like
     // Object.prototype.toString$0 end up calling the toString on Object instead
     // of on the derived type.
     if (member is MethodMember && !member.declaringType.hasNativeSubtypes) {
@@ skipping 82 matching lines @@
     nameBuilder.add('\$');
     if (name.contains('\$')) {
       // Disambiguate "a:b:" from "a$b:".  Using the length works well because
       // the names can't start with digits.
       nameBuilder.add('${name.length}');
     }
     nameBuilder.add(name);
   }
   return nameBuilder.toString();
 }