clo_scm          5895 src/extlib.c     ScmObj clo_scm;
clo_scm          5898 src/extlib.c     clo_scm = SCM_ARGREF(0);
clo_scm          5899 src/extlib.c     if (!SCM_CLOSUREP(clo_scm)) Scm_Error("closure required, but got %S", clo_scm);
clo_scm          5900 src/extlib.c     clo = SCM_CLOSURE(clo_scm);