| // This file was procedurally generated from the following sources: |
| // - src/dstr-assignment/array-rest-lref.case |
| // - src/dstr-assignment/default/for-of.template |
| /*--- |
| description: Reference is evaluated during assignment (For..of statement) |
| esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation |
| features: [Symbol.iterator, destructuring-binding] |
| flags: [generated] |
| info: | |
| IterationStatement : |
| for ( LeftHandSideExpression of AssignmentExpression ) Statement |
| |
| 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », |
| AssignmentExpression, iterate). |
| 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, |
| keyResult, assignment, labelSet). |
| |
| 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation |
| |
| [...] |
| 4. If destructuring is true and if lhsKind is assignment, then |
| a. Assert: lhs is a LeftHandSideExpression. |
| b. Let assignmentPattern be the parse of the source text corresponding to |
| lhs using AssignmentPattern as the goal symbol. |
| [...] |
| |
| ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ] |
| |
| [...] |
| 5. Let result be the result of performing |
| IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with |
| iteratorRecord as the argument |
| 6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, |
| result). |
| |
| AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget |
| |
| 1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an |
| ArrayLiteral, then |
| a. Let lref be the result of evaluating DestructuringAssignmentTarget. |
| b. ReturnIfAbrupt(lref). |
| [...] |
| |
| ---*/ |
| var nextCount = 0; |
| var returnCount = 0; |
| var iterable = {}; |
| var iterator = { |
| next: function() { |
| nextCount += 1; |
| return { done: true }; |
| }, |
| return: function() { |
| returnCount += 1; |
| } |
| }; |
| var obj = {}; |
| iterable[Symbol.iterator] = function() { |
| return iterator; |
| }; |
| |
| var counter = 0; |
| |
| for ([...obj['a' + 'b']] of [iterable]) { |
| assert.sameValue(nextCount, 1); |
| assert.sameValue(returnCount, 0); |
| assert(!!obj.ab); |
| assert.sameValue(obj.ab.length, 0); |
| counter += 1; |
| } |
| |
| assert.sameValue(counter, 1); |