JSTests/test262/test/language/expressions/call/spread-sngl-iter.js

// This file was procedurally generated from the following sources:
// - src/spread/sngl-iter.case
// - src/spread/default/call-expr.template
/*---
description: Spread operator applied to the only argument with a valid iterator (CallExpression)
esid: sec-function-calls-runtime-semantics-evaluation
features: [Symbol.iterator]
flags: [generated]
info: |
    CallExpression : MemberExpression Arguments

    [...]
    9. Return EvaluateDirectCall(func, thisValue, Arguments, tailCall).

    12.3.4.3 Runtime Semantics: EvaluateDirectCall

    1. Let argList be ArgumentListEvaluation(arguments).
    [...]
    6. Let result be Call(func, thisValue, argList).
    [...]

    12.3.6.1 Runtime Semantics: ArgumentListEvaluation

    ArgumentList : ... AssignmentExpression

    1. Let list be an empty List.
    2. Let spreadRef be the result of evaluating AssignmentExpression.
    3. Let spreadObj be GetValue(spreadRef).
    4. Let iterator be GetIterator(spreadObj).
    5. ReturnIfAbrupt(iterator).
    6. Repeat
       a. Let next be IteratorStep(iterator).
       b. ReturnIfAbrupt(next).
       c. If next is false, return list.
       d. Let nextArg be IteratorValue(next).
       e. ReturnIfAbrupt(nextArg).
       f. Append nextArg as the last element of list.
---*/
var iter = {};
iter[Symbol.iterator] = function() {
  var nextCount = 0;
  return {
    next: function() {
      nextCount += 1;
      return { done: nextCount === 3, value: nextCount };
    }
  };
};

var callCount = 0;

(function() {
  assert.sameValue(arguments.length, 2);
  assert.sameValue(arguments[0], 1);
  assert.sameValue(arguments[1], 2);
  callCount += 1;
}(...iter));

assert.sameValue(callCount, 1);