SCM_MAYBE_P 1328 ext/net/netlib.c if (!SCM_MAYBE_P(SCM_STRINGP, nodename_scm)) Scm_Error("const C string or #f required, but got %S", nodename_scm); SCM_MAYBE_P 1331 ext/net/netlib.c if (!SCM_MAYBE_P(SCM_STRINGP, servname_scm)) Scm_Error("const C string or #f required, but got %S", servname_scm);