//! Revisions is the generalized notion of a commit.//!//! This module provides utilities to walk graphs of revisions and specify revisions and ranges of revisions. pub use git_revision as plumbing; ///pub mod walk;pub use walk::iter::Walk; ///pub mod spec; /// The specification of a revision as parsed from a revision specification like `HEAD@{1}` or `v1.2.3...main`./// It's typically created by [`repo.rev_parse()`][crate::Repository::rev_parse()].////// See the [official git documentation](https://git-scm.com/docs/git-rev-parse#_specifying_revisions) for reference on how/// to specify revisions and revision ranges.#[derive(Clone, Debug)]pub struct Spec<'repo> {    pub(crate) inner: git_revision::Spec,    /// The first name of a reference as seen while parsing a `RevSpec`, for completeness.    pub(crate) first_ref: Option<git_ref::Reference>,    /// The second name of a reference as seen while parsing a `RevSpec`, for completeness.    pub(crate) second_ref: Option<git_ref::Reference>,    pub(crate) repo: &'repo crate::Repository,}