bignum.c:38
static VALUE
bignew_1(klass, len, sign)
    VALUE klass;
    long len;
    char sign;
{
    NEWOBJ(big, struct RBignum);
    OBJSETUP(big, klass, T_BIGNUM);
    big->sign = sign;
    big->len = len;
    big->digits = ALLOC_N(BDIGIT, len);

    return (VALUE)big;
}
