Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
index b28becfe0f946d38a49401ce62826448e2d284d6..5e35a422c4815dcf247bd7ece6c575c1f31519c5 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.dart
@@ -301,14 +301,24 @@ class ClassEmitter extends CodeEmitterHelper {
     }
 
     if (backend.isNeededForReflection(classElement)) {
-      Link typeVars = classElement.typeVariables;
+      bool sameList(List a, List b) {

[Johnni Winther, 2014/02/26 14:01:54]

Put this in util.dart and reuse in dart_types.dart ?

[karlklose, 2014/02/27 09:31:41]

Done.

+        if (a.length != b.length) return false;
+        for (int index = 0; index < a.length; index++) {
+          if (a[index] != b[index]) {
+            return false;
+          }
+        }
+        return true;
+      }
+
+      List<DartType> typeVars = classElement.typeVariables;
       Iterable typeVariableProperties = task.typeVariableHandler
           .typeVariablesOf(classElement).map(js.toExpression);
 
       ClassElement superclass = classElement.superclass;
       bool hasSuper = superclass != null;
       if ((!typeVariableProperties.isEmpty && !hasSuper) ||
-          (hasSuper && superclass.typeVariables != typeVars)) {
+          (hasSuper && !sameList(superclass.typeVariables, typeVars))) {
         classBuilder.addProperty('<>',
             new jsAst.ArrayInitializer.from(typeVariableProperties));
       }