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async-gen-decl-dstr-array-elem-iter-nrml-close-skip.js (1962B)


      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-assignment-for-await/array-elem-iter-nrml-close-skip.case
      4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
      5 /*---
      6 description: IteratorClose is not called when assignment evaluation has exhausted the iterator (for-await-of statement in an async generator declaration)
      7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      8 features: [Symbol.iterator, destructuring-binding, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    IterationStatement :
     12      for await ( LeftHandSideExpression of AssignmentExpression ) Statement
     13 
     14    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     15       AssignmentExpression, iterate).
     16    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     17       keyResult, assignment, labelSet).
     18 
     19    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     20 
     21    [...]
     22    5. If destructuring is true and if lhsKind is assignment, then
     23       a. Assert: lhs is a LeftHandSideExpression.
     24       b. Let assignmentPattern be the parse of the source text corresponding to
     25          lhs using AssignmentPattern as the goal symbol.
     26    [...]
     27 
     28    ArrayAssignmentPattern : [ AssignmentElementList ]
     29 
     30    [...]
     31    4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
     32    5. Return result.
     33 
     34 ---*/
     35 let nextCount = 0;
     36 let returnCount = 0;
     37 let _;
     38 let iterator = {
     39  next() {
     40    nextCount += 1;
     41    return { done: true };
     42  },
     43  return() {
     44    returnCount += 1;
     45    return {};
     46  }
     47 };
     48 let iterable = {
     49  [Symbol.iterator]() {
     50    return iterator;
     51  }
     52 };
     53 
     54 let iterCount = 0;
     55 async function * fn() {
     56  for await ([ _ ] of [iterable]) {
     57    assert.sameValue(nextCount, 1);
     58    assert.sameValue(returnCount, 0);
     59 
     60    iterCount += 1;
     61  }
     62 }
     63 
     64 let iter = fn();
     65 
     66 iter.next().then(() => {
     67  assert.sameValue(iterCount, 1);
     68 }).then($DONE, $DONE);