Scm_MakePromise  2974 src/extlib.c    SCM_RESULT = (Scm_MakePromise(TRUE, obj));
Scm_MakePromise  2443 src/gauche.h   SCM_EXTERN ScmObj Scm_MakePromise(int forced, ScmObj code);
Scm_MakePromise  1974 src/vm.c                       VAL0 = Scm_MakePromise(FALSE, VAL0);