Back out 97036ab72558 which inappropriately compared turds to third parties.
1 // 'this' in generator-expression in strict-mode toplevel
2 // is the same as global 'this'.
6 var it1 = (this for (x of [0]));
7 assertEq(it1.next(), this);
9 var it2 = (this for (x of (this for (y of (this for (z of [0]))))));
10 assertEq(it2.next(), this);