tor-browser

The Tor Browser
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async-gen-decl-dstr-array-rest-lref.js (2458B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-assignment-for-await/array-rest-lref.case
      4 // - src/dstr-assignment-for-await/async-generator/async-gen-decl.template
      5 /*---
      6 description: Reference is evaluated during assignment (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 : [ Elisionopt AssignmentRestElement ]
     29 
     30    [...]
     31    4. Let result be the result of performing
     32      IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
     33      with iteratorRecord as the argument.
     34    5. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
     35 
     36 
     37    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
     38 
     39    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
     40       ArrayLiteral, then
     41       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
     42       b. ReturnIfAbrupt(lref).
     43    [...]
     44 
     45 ---*/
     46 let nextCount = 0;
     47 let returnCount = 0;
     48 let iterator = {
     49  next() {
     50    nextCount += 1;
     51    return { done: true };
     52  },
     53  return() {
     54    returnCount += 1;
     55  }
     56 };
     57 let obj = {};
     58 let iterable = {
     59  [Symbol.iterator]() {
     60    return iterator;
     61  }
     62 };
     63 
     64 let iterCount = 0;
     65 async function * fn() {
     66  for await ([...obj['a' + 'b']] of [iterable]) {
     67    assert.sameValue(nextCount, 1);
     68    assert.sameValue(returnCount, 0);
     69    assert(!!obj.ab);
     70    assert.sameValue(obj.ab.length, 0);
     71 
     72    iterCount += 1;
     73  }
     74 }
     75 
     76 let iter = fn();
     77 
     78 iter.next()
     79  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
     80  .then($DONE, $DONE);