| // 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]--; |