| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 19.1.2.1 |
| description: Invoked with a source whose own property keys cannot be retrieved |
| info: | |
| [...] |
| 5. For each element nextSource of sources, in ascending index order, |
| a. If nextSource is undefined or null, let keys be an empty List. |
| b. Else, |
| i. Let from be ToObject(nextSource). |
| ii. ReturnIfAbrupt(from). |
| iii. Let keys be from.[[OwnPropertyKeys]](). |
| iv. ReturnIfAbrupt(keys). |
| features: [Proxy] |
| ---*/ |
| |
| var source = new Proxy({}, { |
| ownKeys: function() { |
| throw new Test262Error(); |
| } |
| }); |
| |
| assert.throws(Test262Error, function() { |
| Object.assign({}, source); |
| }); |