fsdbm_has_key    1058 ext/sdbm/init.c     rb_define_method(rb_cDBM, "has_key?", fsdbm_has_key, 1);
fsdbm_has_key    1059 ext/sdbm/init.c     rb_define_method(rb_cDBM, "include?", fsdbm_has_key, 1);
fsdbm_has_key    1060 ext/sdbm/init.c     rb_define_method(rb_cDBM, "key?", fsdbm_has_key, 1);
fsdbm_has_key    1061 ext/sdbm/init.c     rb_define_method(rb_cDBM, "member?", fsdbm_has_key, 1);