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async-gen-decl-dstr-array-elem-trlg-iter-list-nrml-close.js (2899B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-assignment-for-await/array-elem-trlg-iter-list-nrml-close.case
      4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
      5 /*---
      6 description: IteratorClose is invoked when evaluation of AssignmentElementList completes without exhausting 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 :
     29        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
     30 
     31    [...]
     32    2. Let iteratorRecord be Record {[[iterator]]: iterator, [[done]]: false}.
     33    3. Let status be the result of performing
     34       IteratorDestructuringAssignmentEvaluation of AssignmentElementList using
     35       iteratorRecord as the argument.
     36    4. If status is an abrupt completion, then
     37       a. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     38          status).
     39       b. Return Completion(status).
     40 
     41    7.4.6 IteratorClose ( iterator, completion )
     42 
     43    [...]
     44    5. Let innerResult be Call(return, iterator, « »).
     45    [...]
     46 
     47 ---*/
     48 let nextCount = 0;
     49 let returnCount = 0;
     50 let thisValue = null;
     51 let args = null;
     52 let x;
     53 let iterator = {
     54  next() {
     55    nextCount += 1;
     56    // Set an upper-bound to limit unnecessary iteration in non-conformant
     57    // implementations
     58    return { done: nextCount > 10 };
     59  },
     60  return() {
     61    returnCount += 1;
     62    thisValue = this;
     63    args = arguments;
     64    return {};
     65  }
     66 };
     67 let iterable = {
     68  [Symbol.iterator]() {
     69    return iterator;
     70  }
     71 };
     72 
     73 let iterCount = 0;
     74 async function * fn() {
     75  for await ([ x , ] of [iterable]) {
     76    assert.sameValue(nextCount, 1);
     77    assert.sameValue(returnCount, 1);
     78    assert.sameValue(thisValue, iterator, 'correct `this` value');
     79    assert(!!args, 'arguments object provided');
     80    assert.sameValue(args.length, 0, 'zero arguments specified');
     81 
     82    iterCount += 1;
     83  }
     84 }
     85 
     86 let iter = fn();
     87 
     88 iter.next()
     89  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
     90  .then($DONE, $DONE);