| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 9.5.4 |
| description: > |
| Throws a TypeError exception if boolean trap result is true and target is |
| extensible. |
| info: | |
| [[PreventExtensions]] ( ) |
| |
| ... |
| 10. If booleanTrapResult is true, then |
| ... |
| c. If targetIsExtensible is true, throw a TypeError exception. |
| 11. Return booleanTrapResult. |
| ... |
| features: [Proxy] |
| ---*/ |
| |
| var p = new Proxy({}, { |
| preventExtensions: function(t) { |
| return true; |
| } |
| }); |
| |
| assert.throws(TypeError, function() { |
| Object.preventExtensions(p); |
| }); |