lazy-methods-reentry-not-close-iterator.js

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// |reftest| skip-if(!this.hasOwnProperty('Iterator'))

const methods = [

  [iter => iter.map, x => x],

  [iter => iter.filter, x => true],

  [iter => iter.flatMap, x => [x]],

];

for (const method of methods) {

  const iter = [1, 2, 3].values();

  const iterMethod = method[0](iter);

  let iterHelper;

  let reentered = false;

  iterHelper = iterMethod.call(iter, x => {

    if (x == 2) {

      // Reenter the currently running generator.

      reentered = true;

      assertThrowsInstanceOf(() => iterHelper.next(), TypeError);

    return method[1](x);

});

  let result = iterHelper.next();

  assertEq(result.value, 1);

  assertEq(result.done, false);

  assertEq(reentered, false);

  result = iterHelper.next();

  assertEq(reentered, true);

  assertEq(result.value, 2);

  assertEq(result.done, false);

  result = iterHelper.next();

  assertEq(result.value, 3);

  assertEq(result.done, false);

  result = iterHelper.next();

  assertEq(result.value, undefined);

  assertEq(result.done, true);

if (typeof reportCompare == 'function')

  reportCompare(0, 0);