Added more non-standard tests

* `Date.prototype.toLocaleFormat`
* error `columnNumber`
* `__lookupGetter__`
* String generics
* `for each...in`
* Iterator
* `__iterator__`
* Generators (JS 1.8)
* Array comprehensions
* Generator comprehensions

(Oh, well, if you mean "just that one line" rather than the entire set of checks in the test, then, well, OK, mostly I wrote it like that for visual consistency with the lines below - but it does seem leery.)