use std::collections::HashSet; use git_hash::ObjectId;use git_revision::spec::parse; use crate::{bstr::BStr, revision::Spec, Repository}; mod types;pub use types::{Error, ObjectKindHint, Options, RefsHint}; ///pub mod error; impl<'repo> Spec<'repo> {    /// Parse `spec` and use information from `repo` to resolve it, using `opts` to learn how to deal with ambiguity.    ///    /// Note that it's easier and to use [`repo.rev_parse()`][Repository::rev_parse()] instead.    pub fn from_bstr<'a>(spec: impl Into<&'a BStr>, repo: &'repo Repository, opts: Options) -> Result<Self, Error> {        let mut delegate = Delegate::new(repo, opts);        match git_revision::spec::parse(spec.into(), &mut delegate) {            Err(parse::Error::Delegate) => Err(delegate.into_err()),            Err(err) => Err(err.into()),            Ok(()) => delegate.into_rev_spec(),        }    }} struct Delegate<'repo> {    refs: [Option<git_ref::Reference>; 2],    objs: [Option<HashSet<ObjectId>>; 2],    /// The originally encountered ambiguous objects for potential later use in errors.    ambiguous_objects: [Option<HashSet<ObjectId>>; 2],    idx: usize,    kind: Option<git_revision::spec::Kind>,     opts: Options,    err: Vec<Error>,    /// The ambiguous prefix obtained during a call to `disambiguate_prefix()`.    prefix: [Option<git_hash::Prefix>; 2],    /// If true, we didn't try to do any other transformation which might have helped with disambiguation.    last_call_was_disambiguate_prefix: [bool; 2],     repo: &'repo Repository,} mod delegate;