Bug 1070465 - Give JS_UNINITIALIZED_LEXICAL constants unknown type sets in Ion. (r=jandem)
Bug 1073702 - Check for uninitialized lexical bindings in FetchName and friends. (r=jandem)
Bug 1074504 - Consider TDZ uses effectful in the frontend. (r=Waldo)
Bug 1074571 - Make the delete operator trigger TDZ. (r=Waldo)