JSTests/test262/test/language/expressions/array/spread-err-mult-err-itr-step.js

// This file was procedurally generated from the following sources:
// - src/spread/mult-err-itr-step.case
// - src/spread/error/array.template
/*---
description: Spread operator following other arguments when IteratorStep fails (Array initializer)
esid: sec-runtime-semantics-arrayaccumulation
features: [Symbol.iterator]
flags: [generated]
info: |
    SpreadElement : ...AssignmentExpression

    1. Let spreadRef be the result of evaluating AssignmentExpression.
    2. Let spreadObj be ? GetValue(spreadRef).
    3. Let iterator be ? GetIterator(spreadObj).
    4. Repeat
       a. Let next be ? IteratorStep(iterator).
       b. If next is false, return nextIndex.
       c. Let nextValue be ? IteratorValue(next).
       d. Let status be CreateDataProperty(array, ToString(ToUint32(nextIndex)),
          nextValue).
       e. Assert: status is true.
       f. Let nextIndex be nextIndex + 1.

    12.3.6.1 Runtime Semantics: ArgumentListEvaluation

    ArgumentList : ArgumentList , ... AssignmentExpression

    1. Let precedingArgs be the result of evaluating ArgumentList.
    2. Let spreadRef be the result of evaluating AssignmentExpression.
    3. Let iterator be GetIterator(GetValue(spreadRef) ).
    4. ReturnIfAbrupt(iterator).

    7.4.5 IteratorStep ( iterator )

    1. Let result be IteratorNext(iterator).
    2. ReturnIfAbrupt(result).

    7.4.2 IteratorNext ( iterator, value )

    1. If value was not passed, then
       a. Let result be Invoke(iterator, "next", « »).
    [...]
    3. ReturnIfAbrupt(result).
---*/
var iter = {};
iter[Symbol.iterator] = function() {
  return {
    next: function() {
      throw new Test262Error();
    }
  };
};

assert.throws(Test262Error, function() {
  [0, ...iter];
});