// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

js> version(170)
170
js> var foo = {
  >   __iterator__ : function(onlyKeys) {
  >     print(onlyKeys);
  >     yield [0, "a"];
  >   }
  > };
js> for each (let f in foo) {}
false
js> for (let f in foo) {}
true