Fix issue 6472 that exhibited a few crashing bugs in dart2js.

lib/compiler/implementation/universe/universe.dart

Index: lib/compiler/implementation/universe/universe.dart
===================================================================
--- lib/compiler/implementation/universe/universe.dart	(revision 14453)
+++ lib/compiler/implementation/universe/universe.dart	(working copy)
@@ -430,7 +430,7 @@
       return appliesUntyped(element, compiler);
     }
 
-    if (!self.isInterface() && self.isSubclassOf(other)) {
+    if (!self.isTypedef() && !self.isInterface() && self.isSubclassOf(other)) {

[ahe, 2012/11/05 08:33:32]

I think it would be better with a positive test, such as: self.isClass(). Also,
I'm not sure the value of testing for isInterface as classes can be used as
interfaces as well.

[ngeoffray, 2012/11/05 10:51:03]

Done.

       // Resolve an invocation of [element.name] on [self]. If it
       // is found, this selector is a candidate.
       return hasElementIn(self, element) && appliesUntyped(element, compiler);