Support static/global field initializations.

frog/leg/scanner/partial_parser.dart

 // Copyright (c) 2011, 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 PartialParser extends Parser {
   PartialParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => skipBlock(token);
 
   Token fullParseClassBody(Token token) => super.parseClassBody(token);
 
-  Token parseExpression(Token token) => skipExpression(token);
-
   Token skipExpression(Token token) {
     while (true) {
       final kind = token.kind;
       final value = token.stringValue;
       if ((kind === EOF_TOKEN) ||
           (value === ';') ||
           (value === ',') ||
           (value === ']'))
         return token;
       if (!mayParseFunctionExpressions && value === '{')
         return token;
       if ((value !== '<') && (token is BeginGroupToken)) {
         BeginGroupToken begin = token;
         token = (begin.endGroup !== null) ? begin.endGroup : token;
       }
       token = token.next;
     }
   }
 
   Token parseFunctionBody(Token token, bool isExpression) {
     assert(!isExpression);
     String value = token.stringValue;
     if (value === ';') {
       // No body.
     } else if (value === '=>') {
-      token = parseExpression(token.next);
+      token = skipExpression(token.next);
       expectSemicolon(token);
     } else {
       token = skipBlock(token);
     }
     // There is no "skipped function body event", so we use
     // handleNoFunctionBody instead.
     listener.handleNoFunctionBody(token);
     return token;
   }
 
   Token parseFormalParameters(Token token) => skipFormals(token);
 
   Token skipFormals(BeginGroupToken token) {
     listener.beginOptionalFormalParameters(token);
     expect('(', token);
     Token endToken = token.endGroup;
     listener.endFormalParameters(0, token, endToken);
     return endToken.next;
   }
 }