Remove nested groups in use.

use ffi;

use foreign_types::ForeignType;

use libc::{c_int, c_uchar};

use pkey::{PKey, Private, Public};

use std::cmp;

use symm::Cipher;

use {

    cvt, cvt_p,

    pkey::{PKey, Private, Public},

};

use {cvt, cvt_p};

/// Represents a EVP_Seal context.

pub struct EvpSeal {

#[cfg(test)]

mod test {

    use super::*;

    use {pkey::PKey, symm::Cipher};

    use pkey::PKey;

    use symm::Cipher;

    #[test]

    fn public_encrypt_private_decrypt() {