Scm_BignumAdd    2063 src/gauche.h   SCM_EXTERN ScmObj Scm_BignumAdd(ScmBignum *bx, ScmBignum *by);
Scm_BignumAdd     896 src/number.c                   arg0 = Scm_BignumAdd(SCM_BIGNUM(Scm_MakeBignumFromSI(result_int)),
Scm_BignumAdd    1449 src/number.c                       return Scm_BignumAdd(SCM_BIGNUM(y), SCM_BIGNUM(rem));