| // Copyright (C) 2017 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys |
| description: > |
| The returned list must not contain any duplicate entries. |
| info: | |
| [[OwnPropertyKeys]] ( ) |
| |
| ... |
| 9. If trapResult contains any duplicate entries, throw a TypeError exception. |
| features: [Proxy] |
| ---*/ |
| |
| var p = new Proxy({}, { |
| ownKeys: function() { |
| return ["a", "a"]; |
| } |
| }); |
| |
| assert.throws(TypeError, function() { |
| Object.keys(p); |
| }); |