Add an element for mixin applications. For now, the resolver complains about mixin applications -- …

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 1e34e04793b5df4f554fd8ac975354529ea9616a..568ae79229f3a14c7a3cde9e79e84ff009b63f3e 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -418,6 +418,17 @@ class ResolverTask extends CompilerTask {
   ClassElement currentlyResolvedClass;
   Queue<ClassElement> pendingClassesToBeResolved = new Queue<ClassElement>();
 
+  void resolveMixinApplication(MixinApplicationElement element) {
+    // TODO(kasperl): Implement this.
+    assert(element.resolutionState == STATE_NOT_STARTED);
+    element.resolutionState = STATE_STARTED;
+    compiler.reportMessage(
+        compiler.spanFromSpannable(element.cachedNode),
+        MessageKind.GENERIC.error(['unimplemented mixin application']),
+        Diagnostic.ERROR);
+    element.resolutionState = STATE_DONE;
+  }
+
   /**
    * Resolve the class [element].
    *