Handle deferred access as pre-step in SemanticSendVisitor.

pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart

 // Copyright (c) 2015, 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 dart2js.semantics_visitor;
 
 /// Interface for bulk handling of a [Node] in a semantic visitor.
 abstract class BulkHandle<R, A> {
   /// Handle [node] either regardless of semantics or to report that [node] is
   /// unhandled. [message] contains a message template for the latter case:
@@ skipping 2460 matching lines @@
   }
 
   @override
   R visitLogicalOr(
       Send node,
       Node left,
       Node right,
       A arg) {
     return bulkHandleNode(node, 'Lazy or `#` unhandled.', arg);
   }
+
+  @override
+  void previsitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      A arg) {
+    bulkHandleNode(node, 'Deferred access `#` unhandled.', arg);
+  }
 }
 
 /// Mixin that implements all visitor methods for `super` calls in
 /// [SemanticSendVisitor] by delegating to a bulk handler.
 ///
 /// Use this mixin to provide a trivial implementation for `super` calls
 /// visitor methods.
 abstract class SuperBulkMixin<R, A>
     implements SemanticSendVisitor<R, A>, BulkHandle<R, A> {
 
@@ skipping 1012 matching lines @@
 
 
 /// [SemanticSendVisitor] that visits subnodes.
 class TraversalSendMixin<R, A> implements SemanticSendVisitor<R, A> {
   @override
   R apply(Node node, A arg) {
     throw new UnimplementedError("TraversalMixin.apply unimplemented");
   }
 
   @override
+  void previsitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      A arg) {
+  }
+
+  @override
   R errorInvalidAssert(
       Send node,
       NodeList arguments,
       A arg) {
     apply(arguments, arg);
     return null;
   }
 
   @override
   R visitClassTypeLiteralSet(
@@ skipping 7214 matching lines @@
       NewExpression node,
       ConstructorElement constructor,
       InterfaceType type,
       NodeList arguments,
       CallStructure callStructure,
       A arg) {
     return handleConstructorInvoke(
         node, constructor, type, arguments, callStructure, arg);
   }
 }