Less inequivalence on Hello World!

pkg/compiler/lib/src/elements/types.dart

Index: pkg/compiler/lib/src/elements/types.dart
diff --git a/pkg/compiler/lib/src/elements/types.dart b/pkg/compiler/lib/src/elements/types.dart
index 260ab3479c47f6818eeaaa4fdf92a5b92a22c1f6..71faca306f9dbc1b667f93a06312ed83fe1a4f48 100644
--- a/pkg/compiler/lib/src/elements/types.dart
+++ b/pkg/compiler/lib/src/elements/types.dart
@@ -789,6 +789,9 @@ abstract class DartTypes {
   /// Returns all supertypes of [cls].
   Iterable<InterfaceType> getSupertypes(ClassEntity cls);
 
+  /// Returns all types directly implemented by [cls].
+  Iterable<InterfaceType> getInterfaces(ClassEntity cls);
+
   /// Returns the type of the `call` method on [type], or `null` if the class
   /// of [type] does not have a `call` method.
   FunctionType getCallType(InterfaceType type);