tkNone_to_s      1745 ext/tk/tkutil/tkutil.c     rb_define_singleton_method(TK_None, "to_s", tkNone_to_s, 0);
tkNone_to_s      1746 ext/tk/tkutil/tkutil.c     rb_define_singleton_method(TK_None, "inspect", tkNone_to_s, 0);