Scm_BignumLogXor 2078 src/gauche.h   SCM_EXTERN ScmObj Scm_BignumLogXor(ScmBignum *bx, ScmBignum *by);
Scm_BignumLogXor 1852 src/number.c       return Scm_BignumLogXor(SCM_BIGNUM(x), SCM_BIGNUM(y));