// Test for-of with iter.next and monkeypatching. function* g(n) { for (var i=0; i<n; i++) yield i; } var GeneratorObjectPrototype = Object.getPrototypeOf(g).prototype; var GeneratorObjectPrototype_next = GeneratorObjectPrototype.next; // Monkeypatch next on an iterator. var inner = g(20); var n = 0; for (let x of inner) { if (n == 0) { assertEq(x, n++); } else if (n == 1) { assertEq(x, n++); inner.next = function() { return { value: 42, done: false }; }; } else if (n == 2) { assertEq(x, 42); inner.next = function() { return { value: 100, done: true }; }; } else throw 'not reached'; } // Monkeypatch next on the prototype. var inner = g(20); var n = 0; for (let x of inner) { if (n == 0) { assertEq(x, n++); } else if (n == 1) { assertEq(x, n++); GeneratorObjectPrototype.next = function() { return { value: 42, done: false }; }; } else if (n == 2) { n++; assertEq(x, 42); GeneratorObjectPrototype.next = GeneratorObjectPrototype_next; } else if (n <= 20) { assertEq(x, n++ - 1); } else throw 'not reached'; }