fgdbm_delete_if  1206 ext/gdbm/gdbm.c     rb_define_method(rb_cGDBM, "delete_if", fgdbm_delete_if, 0);
fgdbm_delete_if  1207 ext/gdbm/gdbm.c     rb_define_method(rb_cGDBM, "reject!", fgdbm_delete_if, 0);