Fix bugs in cascade implementation.

lib/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.
 
 /**
  * An event generating parser of Dart programs. This parser expects
  * all tokens in a linked list.
  */
 class Parser {
   final Listener listener;
@@ skipping 906 matching lines @@
         tokenLevel = info.precedence;
       }
     }
     return token;
   }
 
   Token parseCascadeExpression(Token token) {
     listener.beginCascade(token);
     assert(optional('..', token));
     Token cascadeOperator = token;
+    token = token.next;
     if (optional('[', token)) {
       token = parseArgumentOrIndexStar(token);
     } else if (isIdentifier(token)) {
       token = parseSend(token);
       listener.handleBinaryExpression(cascadeOperator);
     } else {
       return listener.unexpected(token);
     }
     Token mark;
     do {
       mark = token;
       if (optional('.', token)) {
         Token period = token;
-        token = parseSend(token);
+        token = parseSend(token.next);
         listener.handleBinaryExpression(period);
       }
       token = parseArgumentOrIndexStar(token);
     } while (mark !== token);
 
     if (token.info.precedence === ASSIGNMENT_PRECEDENCE) {
       Token assignment = token;
-      token = parsePrecedenceExpression(token, CASCADE_PRECEDENCE + 1);
+      token = parsePrecedenceExpression(token.next, CASCADE_PRECEDENCE + 1);
       listener.handleAssignmentExpression(assignment);
     }
     listener.endCascade();
     return token;
   }
 
   Token parseUnaryExpression(Token token) {
     String value = token.stringValue;
     // Prefix:
     if (value === '+') {
@@ skipping 659 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }