Various token issues fixed in the compiler

lib/compiler/implementation/tree/nodes.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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitBreakStatement(BreakStatement node);
   R visitCascade(Cascade node);
   R visitCascadeReceiver(CascadeReceiver node);
   R visitCaseMatch(CaseMatch node);
@@ skipping 338 matching lines @@
     return new SendSet(newReceiver, selector, assignmentOperator,
                        argumentsNode);
   }
 
   Token getBeginToken() {
     if (isPrefix) return assignmentOperator.getBeginToken();
     return super.getBeginToken();
   }
 
   Token getEndToken() {
-    if (isPrefix) return super.getEndToken();
-    return assignmentOperator.getEndToken();
+    if (isPostfix) return assignmentOperator.getEndToken();
+    return super.getEndToken();
   }
 }
 
 class NewExpression extends Expression {
   /** The token NEW or CONST */
   final Token newToken;
 
   // Note: we expect that send.receiver is null.
   final Send send;
 
@@ skipping 1369 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send !== null) return f(send.arguments.head);
 }