Add more tests and fix the parser to deal with generic superclasses for mixin applications.

sdk/lib/_internal/compiler/implementation/scanner/parser.dart

Index: sdk/lib/_internal/compiler/implementation/scanner/parser.dart
diff --git a/sdk/lib/_internal/compiler/implementation/scanner/parser.dart b/sdk/lib/_internal/compiler/implementation/scanner/parser.dart
index 06ef26596c3e78c2898447adfd11f855e41ad3cb..7c7cb774062372fe2853afe09da77a217c295267 100644
--- a/sdk/lib/_internal/compiler/implementation/scanner/parser.dart
+++ b/sdk/lib/_internal/compiler/implementation/scanner/parser.dart
@@ -490,8 +490,8 @@ class Parser {
     Token extendsKeyword;
     if (optional('extends', token)) {
       extendsKeyword = token;
-      if (optional('with', token.next.next)) {
-        token = parseMixinApplication(token.next);
+      if (optional('with', peekAfterType(token.next))) {
+          token = parseMixinApplication(token.next);

[karlklose, 2013/01/25 10:12:47]

Remove whitespace.

       } else {
         token = parseType(token.next);
       }