use crate::pack;use std::io; #[derive(thiserror::Error, Debug)]pub enum Error {    #[error("An IO error occurred when reading the pack or creating a temporary file")]    Io(#[from] io::Error),    #[error("A pack entry could not be extracted")]    PackEntryDecode(#[from] pack::data::iter::Error),    #[error("Indices of type {} cannot be written, only {} are supported", *.0 as usize, pack::index::Kind::default() as usize)]    Unsupported(pack::index::Kind),    #[error("Ref delta objects are not supported as there is no way to look them up. Resolve them beforehand.")]    IteratorInvariantNoRefDelta,    #[error("The iterator failed to set a trailing hash over all prior pack entries in the last provided entry")]    IteratorInvariantTrailer,    #[error("Did not encounter a single base")]    IteratorInvariantBasesPresent,    #[error("Only u32::MAX objects can be stored in a pack, found {0}")]    IteratorInvariantTooManyObjects(usize),    #[error("{pack_offset} is not a valid offset for pack offset {distance}")]    IteratorInvariantBaseOffset { pack_offset: u64, distance: u64 },    #[error(transparent)]    Tree(#[from] pack::tree::Error),    #[error(transparent)]    TreeTraversal(#[from] pack::tree::traverse::Error),}