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async-gen-dstr-var-ary-ptrn-elem-id-iter-val-err.js (2538B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-binding-for-await/ary-ptrn-elem-id-iter-val-err.case
      4 // - src/dstr-binding-for-await/error/for-await-of-async-gen-var.template
      5 /*---
      6 description: Error forwarding when IteratorValue returns an abrupt completion (for-await-of statement)
      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 ( ForDeclaration of AssignmentExpression ) Statement
     13 
     14    [...]
     15    2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     16      lexicalBinding, labelSet, async).
     17 
     18    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     19 
     20    [...]
     21    4. Let destructuring be IsDestructuring of lhs.
     22    [...]
     23    6. Repeat
     24       [...]
     25       j. If destructuring is false, then
     26          [...]
     27       k. Else
     28          i. If lhsKind is assignment, then
     29             [...]
     30          ii. Else if lhsKind is varBinding, then
     31              [...]
     32          iii. Else,
     33               1. Assert: lhsKind is lexicalBinding.
     34               2. Assert: lhs is a ForDeclaration.
     35               3. Let status be the result of performing BindingInitialization
     36                  for lhs passing nextValue and iterationEnv as arguments.
     37          [...]
     38 
     39    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     40 
     41    SingleNameBinding : BindingIdentifier Initializer_opt
     42 
     43    [...]
     44    3. If iteratorRecord.[[done]] is false, then
     45       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     46       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     47       c. ReturnIfAbrupt(next).
     48       d. If next is false, set iteratorRecord.[[done]] to true.
     49       e. Else,
     50          i. Let v be IteratorValue(next).
     51          ii. If v is an abrupt completion, set iteratorRecord.[[done]] to
     52              true.
     53          iii. ReturnIfAbrupt(v).
     54 
     55 ---*/
     56 var poisonedValue = Object.defineProperty({}, 'value', {
     57  get: function() {
     58    throw new Test262Error();
     59  }
     60 });
     61 var g = {};
     62 g[Symbol.iterator] = function() {
     63  return {
     64    next() {
     65      return poisonedValue;
     66    }
     67  };
     68 };
     69 
     70 async function * gen() {
     71  for await (var [x] of [g]) {
     72    return;
     73  }
     74 }
     75 
     76 gen().next()
     77  .then(_ => {
     78    throw new Test262Error("Expected async function to reject, but resolved.");
     79  }, ({ constructor }) => {
     80    assert.sameValue(constructor, Test262Error);
     81    
     82  })
     83  .then($DONE, $DONE);