use std::sync::atomic::AtomicBool; use crate::File; mod error {    /// The error returned by [File::verify_integrity()][super::File::verify_integrity()].    #[derive(Debug, thiserror::Error)]    #[allow(missing_docs)]    pub enum Error {        #[error("Could not read index file to generate hash")]        Io(#[from] std::io::Error),        #[error("Index checksum should have been {expected}, but was {actual}")]        ChecksumMismatch {            actual: git_hash::ObjectId,            expected: git_hash::ObjectId,        },        #[error("Checksum of in-memory index wasn't computed yet")]        NoChecksum,    }}pub use error::Error; impl File {    /// Verify the integrity of the index to assure its consistency.    pub fn verify_integrity(&self) -> Result<(), Error> {        let checksum = self.checksum.ok_or(Error::NoChecksum)?;        let num_bytes_to_hash = self.path.metadata()?.len() - checksum.as_bytes().len() as u64;        let should_interrupt = AtomicBool::new(false);        let actual = git_features::hash::bytes_of_file(            &self.path,            num_bytes_to_hash as usize,            checksum.kind(),            &mut git_features::progress::Discard,            &should_interrupt,        )?;        (actual == checksum).then(|| ()).ok_or(Error::ChecksumMismatch {            actual,            expected: checksum,        })    }}