Parse function expressions correctly.

dart/frog/leg/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 983 matching lines @@
         return parseLiteralNull(token);
       } else if (value === 'this') {
         return parseThisExpression(token);
       } else if (value === 'super') {
         return parseSuperExpression(token);
       } else if (value === 'new') {
         return parseNewExpression(token);
       } else if (value === 'const') {
         return parseConstExpression(token);
       } else if (value === 'void') {
-        return parseFunction(token, null);
+        return parseFunctionExpression(token);
       } else if (isIdentifier(token)) {
         return parseSendOrFunctionLiteral(token);
       } else {
         return listener.expectedExpression(token);
       }
     } else if (kind === OPEN_PAREN_TOKEN) {
       return parseParenthesizedExpressionOrFunctionLiteral(token);
     } else if ((kind === LT_TOKEN) ||
                (kind === OPEN_SQUARE_BRACKET_TOKEN) ||
                (kind === OPEN_CURLY_BRACKET_TOKEN) ||
@@ skipping 564 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }