mantissa          193 src/bignum.c       ScmObj mantissa, b;
mantissa          199 src/bignum.c       mantissa = Scm_DecodeFlonum(val, &exponent, &sign);
mantissa          200 src/bignum.c       if (!SCM_NUMBERP(mantissa)) {
mantissa          203 src/bignum.c       b = Scm_Ash(mantissa, exponent);