You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: input.rs
    path of file: ./repos/hexyl/src
    
    the code of the file until where you have to start completion: use std::convert::TryFrom;
use std::fs;
use std::io::{self, copy, sink, Read, Seek, SeekFrom};

pub enum Input<'a> {
    File(fs::File),
    Stdin(io::StdinLock<'a>),
}

impl<'a> Read for Input<'a> {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        match *self {
            Input::File(ref mut file) => file.read(buf),
            Input::Stdin(ref mut stdin) => stdin.read(buf),
        }
    }
}

impl<'a> Seek for Input<'a> {
    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
        fn try_skip<R>(reader: R, pos: SeekFrom, err_desc: &'static str) -> io::Result<u64>
        where
            R: Read,
        {
            let cant_seek_abs_err = || Err(io::Error::new(io::ErrorKind::Other, err_desc));

            let offset = match pos {
                SeekFrom::Current(o) => u64::try_from(o).or_else(|_e| cant_seek_abs_err())?,
   
    
    fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
        fn try_skip<R>(reader: R, pos: SeekFrom, err_desc: &'static str) -> io::Result<u64>
        where
            R: Read,
        {
            let cant_seek_abs_err = || Err(io::Error::new(io::ErrorKind::Other, err_desc));

            let offset = match pos {
                SeekFrom::Current(o) => u64::try_from(o).or_else(|_e| cant_seek_abs_err())?,
                SeekFrom::Start(_) | SeekFrom::End(_) => cant_seek_abs_err()?,
            };

            copy(&mut reader.take(offset), &mut sink())
        }

        match *self {
            Input::File(ref mut file) => {
                let seek_res = file.seek(pos);
                if let Err(Some(libc::ESPIPE)) = seek_res.as_ref().map_err(|err| err.raw_os_error())
                {
                    try_skip(
                        file,
                        pos,
                        "Pipes only support seeking forward with a relative offset",
                    )
                } else {
                    seek_res
                }
            }
            Input::Stdin(ref mut stdin) => try_skip(
                stdin,
                pos,
                "STDIN only supports seeking forward with a relative offset",
            ),
        }
    }