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

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of resolution;
 
 abstract class TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   DartType getType(Node node);
@@ skipping 400 matching lines @@
         }
       });
     }));
   }
 
   // TODO(johnniwinther): Remove this queue when resolution has been split into
   // syntax and semantic resolution.
   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].
    *
    * Before calling this method, [element] was constructed by the
    * scanner and most fields are null or empty. This method fills in
    * these fields and also ensure that the supertypes of [element] are
    * resolved.
    *
    * Warning: Do not call this method directly. Instead use
    * [:element.ensureResolved(compiler):].
@@ skipping 2966 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }