Fix for parsing annotations before variables in for-loop with Fasta.

pkg/front_end/lib/src/fasta/parser/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.
 
 library fasta.parser.parser;
 
 import '../fasta_codes.dart'
     show
         FastaCode,
         FastaMessage,
@@ skipping 3361 matching lines @@
       }
       return parseForRest(forKeyword, leftParenthesis, token);
     }
   }
 
   Token parseVariablesDeclarationOrExpressionOpt(Token token) {
     final String value = token.stringValue;
     if (identical(value, ';')) {
       listener.handleNoExpression(token);
       return token;
-    } else if (isOneOf3(token, 'var', 'final', 'const')) {
+    } else if (isOneOf4(token, '@', 'var', 'final', 'const')) {
       return parseVariablesDeclarationNoSemicolon(token);
     }
     Token identifier = peekIdentifierAfterType(token);
     if (identifier != null) {
       assert(identifier.isIdentifier());
       if (isOneOf4(identifier.next, '=', ';', ',', 'in')) {
         return parseVariablesDeclarationNoSemicolon(token);
       }
     }
     return parseExpression(token);
@@ skipping 462 matching lines @@
     previous.setNext(firstToken);
     beforeToken = firstToken;
   }
 }
 
 typedef FastaMessage NoArgument(Uri uri, int charOffset);
 
 typedef FastaMessage TokenArgument(Uri uri, int charOffset, Token token);
 
 typedef FastaMessage StringArgument(Uri uri, int charOffset, String string);