1// Copyright JS Foundation and other contributors, http://js.foundation
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15function checkSyntax (str) {
16  try {
17    eval (str);
18    assert (false);
19  } catch (e) {
20    assert (e instanceof SyntaxError);
21  }
22}
23
24// Only \u200C-Zero width non-joiner, and \u200D-Zero width joiner are allowed
25
26checkSyntax ("_\u200b\u200d");
27checkSyntax ("_\u200c\u200e");
28
29var _\u200c\u200d = 5;
30
31assert (_\u200c\u200d === 5);
32