Function TestYieldStarWithoutReturn

deps/v8/test/mjsunit/es6/iterator-close.js:1314–1337

(get_iterable)

// yield*, argument's return method is "undefined".
function TestYieldStarWithoutReturn(get_iterable) {
  assertTrue(get_iterable().return == undefined);

  function* g() { yield* get_iterable() }

  {
    let gen = g();
    assertEquals({value: 1, done: false}, gen.next());
    assertEquals({value: undefined, done: true}, gen.return());
  }

  assertEquals(42, (() => {
    for (let x of g()) break;
    return 42;
  })());

  assertEquals(42, (() => {
    for (let x of g()) return 42;
  })());

  assertThrowsEquals(() => {
    for (let x of g()) throw 42;
  }, 42);
}
{
  let get_iterable1 = () => [1, 2];
  let get_iterable2 = function*() { yield 1; yield 2 };