Teach Selector.applies about mixins.

sdk/lib/_internal/compiler/implementation/world.dart

Index: sdk/lib/_internal/compiler/implementation/world.dart
diff --git a/sdk/lib/_internal/compiler/implementation/world.dart b/sdk/lib/_internal/compiler/implementation/world.dart
index 271629bf64132666df45a3b3aba08074886ca86e..f3142f6f94060c9a4e2e49995782b59b13a89cbd 100644
--- a/sdk/lib/_internal/compiler/implementation/world.dart
+++ b/sdk/lib/_internal/compiler/implementation/world.dart
@@ -130,6 +130,14 @@ class World {
     return subclasses.contains(type.element);
   }
 
+  // Returns whether a subclass of [superclass] mixes in [other].
+  bool hasAnySubclassThatMixes(ClassElement superclass, ClassElement other) {
+    Set<MixinApplicationElement> uses = mixinUses[other];
+    return (uses != null)

[Lasse Reichstein Nielsen, 2013/02/21 09:32:05]

x ? y : false  => x && y

+        ? uses.any((each) => each.isSubclassOf(superclass))
+        : false;
+  }
+
   void registerUsedElement(Element element) {
     if (element.isInstanceMember() && !element.isAbstract(compiler)) {
       allFunctions.add(element);