text: Function.prototype.X = 42;
  function ownProperties() {
      var props = {};
      var r = function () {};
      for (var a in r) {
          let (a = function() { for (var r=0;r<6;++r) ++a; }) {
              a();
          }
          props[a] = true;
      }
  }
  ownProperties();
  