Start adding support for mixin application syntax. We now parse the typedef variant of mixin applic…

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

Index: sdk/lib/_internal/compiler/implementation/typechecker.dart
diff --git a/sdk/lib/_internal/compiler/implementation/typechecker.dart b/sdk/lib/_internal/compiler/implementation/typechecker.dart
index b89ce75a6035b08eba8aeb99252bd008d83d5107..52b13139e230d9efc9ab274c0d1386ffa9a137de 100644
--- a/sdk/lib/_internal/compiler/implementation/typechecker.dart
+++ b/sdk/lib/_internal/compiler/implementation/typechecker.dart
@@ -800,6 +800,10 @@ class TypeCheckerVisitor implements Visitor<DartType> {
     fail(node);
   }
 
+  DartType visitMixinApplication(MixinApplication node) {
+    fail(node);
+  }
+
   DartType visitDoWhile(DoWhile node) {
     StatementType bodyType = analyze(node.body);
     checkCondition(node.condition);