Introduce OpenWorld.

pkg/compiler/lib/src/universe/function_set.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.
 
 library universe.function_set;
 
 import '../common/names.dart' show Identifiers, Selectors;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../types/types.dart';
@@ skipping 107 matching lines @@
       : this.selector = selector,
         this.constraint = constraint,
         this.hashCode =
             Hashing.mixHashCodeBits(selector.hashCode, constraint.hashCode) {
     assert(constraint != null);
   }
 
   String get name => selector.name;
 
   bool applies(Element element, ClassWorld classWorld) {
-    if (!selector.appliesUnnamed(element, classWorld)) return false;
+    if (!selector.appliesUnnamed(element, classWorld.backend)) return false;
     return constraint.canHit(element, selector, classWorld);
   }
 
   bool needsNoSuchMethodHandling(ClassWorld classWorld) {
     return constraint.needsNoSuchMethodHandling(selector, classWorld);
   }
 
   bool operator ==(other) {
     if (identical(this, other)) return true;
     return selector == other.selector && constraint == other.constraint;
@@ skipping 151 matching lines @@
           } else if (classWorld.isInstantiated(cls.declaration)) {
             return new TypeMask.nonNullSubclass(cls.declaration, classWorld);
           } else {
             // TODO(johnniwinther): Avoid the need for this case.
             return const TypeMask.empty();
           }
         }),
         classWorld);
   }
 }