Process typedefs, referenced from the program.

lib/compiler/implementation/dart_backend/placeholder_collector.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.
 
 class SendVisitor extends ResolvedVisitor {
   final PlaceholderCollector collector;
 
   SendVisitor(this.collector, TreeElements elements) : super(elements);
 
   visitSuperSend(Send node) {}
@@ skipping 115 matching lines @@
           tryMakePrivateIdentifier(
               definition.asSendSet().selector.asIdentifier());
         } else {
           assert(false); // Unreachable.
         }
       }
     }
   }
   
   void collect(Element element, TreeElements elements) {
-    // Skip AbstractFieldElement, it has no node.
-    // Instead getters and setters should be processed explicitly.
-    if (element is AbstractFieldElement) return;
     treeElements = elements;
     Node elementNode;
     if (element is FunctionElement) {
       currentElement = element;
       elementNode = currentElement.parseNode(compiler);
       collectFunctionDeclarationPlaceholders(element, elementNode);
     } else if (element.isField()) {
       // TODO(smok): In the future make sure we don't process same
       // variable list element twice, better merge this with emitter logic.
       currentElement = element.variables;
@@ skipping 73 matching lines @@
         final send = node.typeName.asSend();
         final hasPrefix = element.lookupConstructor(
           send.receiver.source, send.selector.source) === null;
         if (!hasPrefix) target = send.receiver;
       }
     }
     makeTypePlaceholder(target, type);
     node.visitChildren(this);
   }
 }