src/third_party/mozjs-45/js/src/jit-test/tests/basic/bug737251.js

a = {}
a.getOwnPropertyDescriptor = Array;
b = Proxy.create(a)
for (x in this)
try {
  (function() {
    "use strict";
    b[2] = x // don't assert
  })()
} catch (e) {}