ip_unset_variable2 8718 ext/tk/tcltklib.c     return ip_unset_variable2(self, varname, Qnil, flag);
ip_unset_variable2 8776 ext/tk/tcltklib.c     return ip_unset_variable2(self, varname, index, 
ip_unset_variable2 10067 ext/tk/tcltklib.c     rb_define_method(ip, "_unset_variable2", ip_unset_variable2, 3);