Improve parser error recovery.

dart/sdk/lib/_internal/compiler/implementation/scanner/parser.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 scanner;
 
 class FormalParameterType {
   final String type;
   const FormalParameterType(this.type);
   bool get isRequired => this == REQUIRED;
@@ skipping 807 matching lines @@
 
     Token token = parseIdentifier(name);
 
     int fieldCount = 1;
     token = parseVariableInitializerOpt(token);
     while (optional(',', token)) {
       token = parseIdentifier(token.next);
       token = parseVariableInitializerOpt(token);
       ++fieldCount;
     }
-    expectSemicolon(token);
+    Token semicolon = token;
+    token = expectSemicolon(token);
     if (isTopLevel) {
-      listener.endTopLevelFields(fieldCount, start, token);
+      listener.endTopLevelFields(fieldCount, start, semicolon);
     } else {
-      listener.endFields(fieldCount, start, token);
+      listener.endFields(fieldCount, start, semicolon);
     }
-    return token.next;
+    return token;
   }
 
   Token parseTopLevelMethod(Token start,
                             Link<Token> modifiers,
                             Token type,
                             Token getOrSet,
                             Token name) {
     Token externalModifier;
     for (Token modifier in modifiers) {
       if (externalModifier == null && optional('external', modifier)) {
@@ skipping 1600 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }