ip_unset_variable2 9615 ext/tk/tcltklib.c     return ip_unset_variable2(self, varname, Qnil, flag);
ip_unset_variable2 9673 ext/tk/tcltklib.c     return ip_unset_variable2(self, varname, index,
ip_unset_variable2 10983 ext/tk/tcltklib.c     rb_define_method(ip, "_unset_variable2", ip_unset_variable2, 3);