tor-browser

The Tor Browser
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async-gen-decl-dstr-array-elem-iter-rtrn-close-null.js (2699B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-assignment-for-await/array-elem-iter-rtrn-close-null.case
      4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
      5 /*---
      6 description: IteratorClose throws a TypeError when `return` returns a non-Object value (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, generators, 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    7.4.6 IteratorClose( iterator, completion )
     35 
     36    [...]
     37    5. Let innerResult be Call(return, iterator, « »).
     38    6. If completion.[[Type]] is throw, return Completion(completion).
     39    7. If innerResult.[[Type]] is throw, return Completion(innerResult).
     40    8. If Type(innerResult.[[Value]]) is not Object, throw a TypeError exception.
     41 
     42 ---*/
     43 let unreachable = 0;
     44 let nextCount = 0;
     45 let returnCount = 0;
     46 let iterator = {
     47  next() {
     48    nextCount += 1;
     49    return {done: false, value: undefined};
     50  },
     51  return() {
     52    returnCount += 1;
     53    return null;
     54  }
     55 };
     56 let iterable = {
     57  [Symbol.iterator]() {
     58    return iterator;
     59  }
     60 };
     61 
     62 let iterCount = 0;
     63 async function * fn() {
     64  for await ([ {} = yield ] of [iterable]) {
     65    unreachable += 1;
     66    iterCount += 1;
     67  }
     68 }
     69 
     70 let iter = fn();
     71 
     72 iter.next().then(result => {
     73  assert.sameValue(nextCount, 1);
     74  assert.sameValue(returnCount, 0);
     75  assert.sameValue(result.value, undefined);
     76  assert.sameValue(result.done, false);
     77 
     78  iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
     79    assert.sameValue(nextCount, 1);
     80    assert.sameValue(returnCount, 1);
     81    assert.sameValue(unreachable, 0);
     82    assert.sameValue(constructor, TypeError);
     83  }).then($DONE, $DONE);
     84 }, $DONE).catch($DONE);