SCM_PROMISEP     2991 src/extlib.c     if (!SCM_PROMISEP(p_scm)) Scm_Error("promise required, but got %S", p_scm);
SCM_PROMISEP     3010 src/extlib.c     if (!SCM_PROMISEP(p_scm)) Scm_Error("promise required, but got %S", p_scm);
SCM_PROMISEP      119 src/promise.c          if (SCM_PROMISEP(result)) {
SCM_PROMISEP      138 src/promise.c      if (!SCM_PROMISEP(obj)) {