Fix syntax check of literal duplication in FormalParameterList (strict mode).

Related issue: #381

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

tests/jerry/regression-test-issue-381.js

@@ -0,0 +1,22 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+function f_0(){
+    'use strict';
+    var v_0 = {
+        p_0: function(a_0, a_1) {}
+    };
+    f_1(function(a_2) {});
+}

tests/jerry/strict.js

@@ -69,3 +69,8 @@ try
 {
   assert (e instanceof TypeError);
 }
+
+(function (a) {
+  (function (a) {
+  });
+});