Scm_BignumSubN   2068 src/gauche.h   SCM_EXTERN ScmObj Scm_BignumSubN(ScmBignum *bx, ScmObj args);
Scm_BignumSubN    999 src/number.c                       return Scm_BignumSubN(SCM_BIGNUM(big), args);
Scm_BignumSubN   1003 src/number.c                   return Scm_BignumSubN(SCM_BIGNUM(big), Scm_Cons(arg1, args));
Scm_BignumSubN   1022 src/number.c               return Scm_BignumSubN(SCM_BIGNUM(arg0), Scm_Cons(arg1, args));