use git_features::hash;use std::io; pub(crate) struct Write<T> {    pub hash: hash::Sha1,    pub inner: T,} impl<T> io::Write for Write<T>where    T: io::Write,{    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {        self.hash.update(buf);        self.inner.write(buf)    }     fn flush(&mut self) -> io::Result<()> {        self.inner.flush()    }} impl<T> Write<T>where    T: io::Write,{    pub fn new(inner: T, kind: git_hash::Kind) -> Self {        match kind {            git_hash::Kind::Sha1 => Write {                inner,                hash: hash::Sha1::default(),            },        }    }}