Function _nfloat_set_mpn_2exp 

pub unsafe extern "C" fn _nfloat_set_mpn_2exp(
    res: nfloat_ptr,
    x: nn_srcptr,
    xn: slong,
    exp: slong,
    xsgnbit: c_int,
    ctx: *mut gr_ctx_struct,
) -> c_int