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    // Copyright 2018 Developers of the Rand project.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.
    extern crate std;

    use crate::{error::UNKNOWN_IO_ERROR, Error};
    use core::convert::From;
    use core::num::NonZeroU32;
    use std::io;

    impl From<io::Error> for Error {
        fn from(err: io::Error) -> Self {
            if let Some(errno) = err.raw_os_error() {
                if let Some(code) = NonZeroU32::new(errno as u32) {
                    return Error::from(code);
                }
            }
            UNKNOWN_IO_ERROR
        }
    }

    impl From<Error> for io::Error {
        fn from(err: Error) -> Self {
            match err.raw_os_error() {
                Some(errno) => io::Error::from_raw_os_error(errno),
                None => io::Error::new(io::ErrorKind::Other, err),
            }
        }
    }

    impl std::error::Error for Error {}

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