test262/test/language/expressions/array/spread-err-mult-err-iter-get-value.js

// This file was procedurally generated from the following sources:
// - src/spread/mult-err-iter-get-value.case
// - src/spread/error/array.template
/*---
description: Spread operator following other arguments when GetIterator fails (@@iterator function return value) (Array initializer)
esid: sec-runtime-semantics-arrayaccumulation
es6id: 12.2.5.2
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).

    7.4.1 GetIterator ( obj, method )

    [...]
    2. Let iterator be ? Call(method, obj).
    3. If Type(iterator) is not Object, throw a TypeError exception.
---*/
var iter = {};
Object.defineProperty(iter, Symbol.iterator, {
  get: function() {
    return null;
  }
});

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