| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding-for-await/ary-init-iter-close.case |
| // - src/dstr-binding-for-await/default/for-await-of-async-func-var-async.template |
| /*--- |
| description: Iterator is closed when not exhausted by pattern evaluation (for-await-of statement) |
| esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation |
| features: [Symbol.iterator, destructuring-binding, async-iteration] |
| flags: [generated, async] |
| info: | |
| IterationStatement : |
| for await ( ForDeclaration of AssignmentExpression ) Statement |
| |
| [...] |
| 2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, |
| lexicalBinding, labelSet, async). |
| |
| 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation |
| |
| [...] |
| 4. Let destructuring be IsDestructuring of lhs. |
| [...] |
| 6. Repeat |
| [...] |
| j. If destructuring is false, then |
| [...] |
| k. Else |
| i. If lhsKind is assignment, then |
| [...] |
| ii. Else if lhsKind is varBinding, then |
| [...] |
| iii. Else, |
| 1. Assert: lhsKind is lexicalBinding. |
| 2. Assert: lhs is a ForDeclaration. |
| 3. Let status be the result of performing BindingInitialization |
| for lhs passing nextValue and iterationEnv as arguments. |
| [...] |
| |
| 13.3.3.5 Runtime Semantics: BindingInitialization |
| |
| BindingPattern : ArrayBindingPattern |
| |
| [...] |
| 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, |
| result). |
| [...] |
| |
| ---*/ |
| var doneCallCount = 0; |
| var iter = {}; |
| iter[Symbol.iterator] = function() { |
| return { |
| next() { |
| return { value: null, done: false }; |
| }, |
| return() { |
| doneCallCount += 1; |
| return {}; |
| } |
| }; |
| }; |
| |
| var iterCount = 0; |
| var asyncIter = (async function*() { |
| yield* [iter]; |
| })(); |
| |
| async function fn() { |
| for await (var [x] of asyncIter) { |
| assert.sameValue(doneCallCount, 1); |
| |
| iterCount += 1; |
| } |
| } |
| |
| fn() |
| .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) |
| .then($DONE, $DONE); |