fix parser error

frog/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.
 
 // TODO(jimhug): Error recovery needs major work!
 /**
  * A simple recursive descent parser for the dart language.
  *
  * This parser is designed to be more permissive than the official
  * Dart grammar.  It is expected that many grammar errors would be
@@ skipping 955 matching lines @@
         }
     }
   }
 
   finishCallOrLambdaExpression(expr) {
     if (_atClosureParameters()) {
       var formals = formalParameterList();
       var body = functionBody(true);
       return _makeFunction(expr, formals, body);
     } else {
+      if (expr is DeclaredIdentifier) {
+        _error('illegal target for call, did you mean to declare a function?',
+          expr.span);
+      }
       var args = arguments();
       return finishPostfixExpression(
           new CallExpression(expr, args, _makeSpan(expr.span.start)));
     }
   }
 
   /** Checks if the given expression is a binary op of the given kind. */
   _isBin(expr, kind) {
     return expr is BinaryExpression && expr.op.kind == kind;
   }
@@ skipping 694 matching lines @@
   int _pos = 0;
   next() {
     var token = tokens[_pos];
     ++_pos;
     if (_pos == tokens.length) {
       parser.tokenizer = previousTokenizer;
     }
     return token;
   }
 }