| // Copyright (C) 2015 André Bargull. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| info: Operator --x evaluates its reference expression once. |
| description: > |
| The operand expression is evaluated exactly once. Operand expression is |
| MemberExpression: base[prop]. ToPropertyKey(prop) is not called multiple |
| times. |
| ---*/ |
| |
| var propKeyEvaluated = false; |
| var base = {}; |
| var prop = { |
| toString: function() { |
| assert(!propKeyEvaluated); |
| propKeyEvaluated = true; |
| return 1; |
| } |
| }; |
| |
| --base[prop]; |
