Introduce OpenWorld.

pkg/compiler/lib/src/js_emitter/class_stub_generator.dart

 // Copyright (c) 2014, 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 dart2js.js_emitter;
 
 class ClassStubGenerator {
   final Namer namer;
   final Compiler compiler;
   final JavaScriptBackend backend;
@@ skipping 65 matching lines @@
 
     Map<jsAst.Name, jsAst.Expression> generatedStubs =
         <jsAst.Name, jsAst.Expression>{};
 
     // Two selectors may match but differ only in type.  To avoid generating
     // identical stubs for each we track untyped selectors which already have
     // stubs.
     Set<Selector> generatedSelectors = new Set<Selector>();
     for (Selector selector in selectors.keys) {
       if (generatedSelectors.contains(selector)) continue;
-      if (!selector.appliesUnnamed(member, compiler.closedWorld)) continue;
+      if (!selector.appliesUnnamed(member, backend)) continue;
       if (selectors[selector].applies(member, selector, compiler.closedWorld)) {
         generatedSelectors.add(selector);
 
         jsAst.Name invocationName = namer.invocationName(selector);
         Selector callSelector = new Selector.callClosureFrom(selector);
         jsAst.Name closureCallName = namer.invocationName(callSelector);
 
         List<jsAst.Parameter> parameters = <jsAst.Parameter>[];
         List<jsAst.Expression> arguments = <jsAst.Expression>[];
         if (isInterceptedMethod) {
@@ skipping 184 matching lines @@
               if (cache === void 0) cache = #tearOff(
                   this, funcs, reflectionInfo, true, [], name).prototype;
               return cache;
             }
           : tearOffGetter(funcs, reflectionInfo, name, isIntercepted);
     }''',
       {'tearOff': tearOffAccessExpression});
 
   return <jsAst.Statement>[tearOffGetter, tearOff];
 }