rust: remove newly redundant `use` statements with the 2021 edition prelude

https://doc.rust-lang.org/edition-guide/rust-2021/prelude.html

rust/hg-core/src/ancestors.rs

@@ -357,7 +357,6 b' mod tests {'
 
     use super::*;
     use crate::testing::{SampleGraph, VecGraph};
-    use std::iter::FromIterator;
 
     fn list_ancestors<G: Graph>(
         graph: G,

rust/hg-core/src/dirstate/entry.rs

@@ -1,7 +1,6 b''
 use crate::dirstate_tree::on_disk::DirstateV2ParseError;
 use crate::errors::HgError;
 use bitflags::bitflags;
-use std::convert::{TryFrom, TryInto};
 use std::fs;
 use std::io;
 use std::time::{SystemTime, UNIX_EPOCH};

rust/hg-core/src/dirstate/parsers.rs

@@ -9,7 +9,6 b' use crate::{dirstate::EntryState, Dirsta'
 use byteorder::{BigEndian, WriteBytesExt};
 use bytes_cast::{unaligned, BytesCast};
 use micro_timer::timed;
-use std::convert::TryFrom;
 
 /// Parents are stored in the dirstate as byte hashes.
 pub const PARENT_SIZE: usize = 20;

rust/hg-core/src/dirstate_tree/on_disk.rs

@@ -17,7 +17,6 b' use bytes_cast::BytesCast;'
 use format_bytes::format_bytes;
 use rand::Rng;
 use std::borrow::Cow;
-use std::convert::{TryFrom, TryInto};
 use std::fmt::Write;
 
 /// Added at the start of `.hg/dirstate` when the "v2" format is used.

rust/hg-core/src/dirstate_tree/status.rs

@@ -24,8 +24,6 b' use once_cell::sync::OnceCell;'
 use rayon::prelude::*;
 use sha1::{Digest, Sha1};
 use std::borrow::Cow;
-use std::convert::TryFrom;
-use std::convert::TryInto;
 use std::io;
 use std::path::Path;
 use std::path::PathBuf;

rust/hg-core/src/matchers.rs

@@ -27,7 +27,6 b' use crate::filepatterns::normalize_path_'
 use std::borrow::ToOwned;
 use std::collections::HashSet;
 use std::fmt::{Display, Error, Formatter};
-use std::iter::FromIterator;
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
 

rust/hg-core/src/revlog/index.rs

@@ -1,4 +1,3 b''
-use std::convert::TryInto;
 use std::ops::Deref;
 
 use byteorder::{BigEndian, ByteOrder};

rust/hg-core/src/revlog/node.rs

@@ -10,7 +10,6 b''
 
 use crate::errors::HgError;
 use bytes_cast::BytesCast;
-use std::convert::{TryFrom, TryInto};
 use std::fmt;
 
 /// The length in bytes of a `Node`

rust/hg-core/src/revlog/revlog.rs

@@ -1,5 +1,4 b''
 use std::borrow::Cow;
-use std::convert::TryFrom;
 use std::io::Read;
 use std::ops::Deref;
 use std::path::Path;

rust/hg-core/src/utils/hg_path.rs

@@ -8,7 +8,6 b''
 use crate::utils::SliceExt;
 use std::borrow::Borrow;
 use std::borrow::Cow;
-use std::convert::TryFrom;
 use std::ffi::{OsStr, OsString};
 use std::fmt;
 use std::ops::Deref;

rust/hg-cpython/src/conversion.rs

@@ -10,7 +10,6 b''
 
 use cpython::{ObjectProtocol, PyObject, PyResult, Python};
 use hg::Revision;
-use std::iter::FromIterator;
 
 /// Utility function to convert a Python iterable into various collections
 ///

rust/hg-cpython/src/dirstate/dirstate_map.rs

@@ -9,7 +9,6 b''
 //! `hg-core` package.
 
 use std::cell::{RefCell, RefMut};
-use std::convert::TryInto;
 
 use cpython::{
     exc, PyBool, PyBytes, PyClone, PyDict, PyErr, PyList, PyNone, PyObject,

rust/hg-cpython/src/utils.rs

@@ -1,7 +1,6 b''
 use cpython::exc::ValueError;
 use cpython::{PyBytes, PyDict, PyErr, PyObject, PyResult, PyTuple, Python};
 use hg::revlog::Node;
-use std::convert::TryFrom;
 
 #[allow(unused)]
 pub fn print_python_trace(py: Python) -> PyResult<PyObject> {

rust/rhg/src/commands/cat.rs

@@ -4,7 +4,6 b' use format_bytes::format_bytes;'
 use hg::operations::cat;
 use hg::utils::hg_path::HgPathBuf;
 use micro_timer::timed;
-use std::convert::TryFrom;
 
 pub const HELP_TEXT: &str = "
 Output the current or given revision of files