| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-runtime-semantics-forin-div-ofbodyevaluation-lhs-stmt-iterator-lhskind-labelset |
| description: > |
| If the left-hand side is not a lexical binding and the assignment produces |
| an error, the iterator should be closed and the error forwarded to the |
| runtime. |
| info: | |
| ... |
| If destructuring is false, then |
| If lhsRef is an abrupt completion, then |
| Let status be lhsRef. |
| Else if lhsKind is lexicalBinding, then |
| Let status be InitializeReferencedBinding(lhsRef, nextValue). |
| Else, |
| Let status be PutValue(lhsRef, nextValue). |
| ... |
| |
| features: [for-of, Symbol.iterator] |
| ---*/ |
| |
| var callCount = 0; |
| var iterationCount = 0; |
| var iterable = {}; |
| var x = { |
| set attr(_) { |
| throw new Test262Error(); |
| } |
| }; |
| |
| iterable[Symbol.iterator] = function() { |
| return { |
| next: function() { |
| return { done: false, value: 0 }; |
| }, |
| return: function() { |
| callCount += 1; |
| } |
| } |
| }; |
| |
| assert.throws(Test262Error, function() { |
| for (x.attr of iterable) { |
| iterationCount += 1; |
| } |
| }); |
| |
| assert.sameValue(iterationCount, 0, 'The loop body is not evaluated'); |
| assert.sameValue(callCount, 1, 'Iterator is closed'); |