Arguments should be BigNumRef and not BigNum

//!

use bn::{BigNum, BigNumRef};

use bn::BigNumRef;

use {cvt, cvt_n, cvt_p};

use ec::EcKeyRef;

use error::ErrorStack;

use ffi;

use foreign_types::{ForeignType, ForeignTypeRef};

use pkey::{Private, Public};

use std::mem;

foreign_type_and_impl_send_sync! {

    /// OpenSSL documentation at [`ECDSA_SIG_set0`]

    ///

    /// [`ECDSA_SIG_set0`]: https://www.openssl.org/docs/man1.1.0/crypto/ECDSA_SIG_set0.html

    pub fn from_private_components(r: BigNum, s: BigNum) -> Result<EcdsaSig, ErrorStack> {

    pub fn from_private_components(r: &BigNumRef, s: &BigNumRef) -> Result<EcdsaSig, ErrorStack> {

        unsafe {

            let sig = cvt_p(ffi::ECDSA_SIG_new())?;

            cvt(compat::set_numbers(sig, r.as_ptr(), s.as_ptr()))?;

            mem::forget((r, s));

            Ok(EcdsaSig::from_ptr(sig as *mut _))

        }

    }

        let r = res.private_component_r().unwrap().to_owned().unwrap();

        let s = res.private_component_s().unwrap().to_owned().unwrap();

        let res2 = EcdsaSig::from_private_components(r, s).unwrap();

        let res2 = EcdsaSig::from_private_components(&r, &s).unwrap();

        let verification2 = res2.verify(data.as_bytes(), &public_key).unwrap();

        assert!(verification2);

    }