rust-status: fix a future compilation error
This was the warning by clippy 1.82.0, which explains the change:
```
warning: this function depends on never type fallback being `()`
--> hg-core/src/dirstate_tree/status.rs:397:5
|
397 | / fn traverse_fs_directory_and_dirstate<'ancestor>(
398 | | &self,
399 | | has_ignored_ancestor: &'ancestor HasIgnoredAncestor<'ancestor>,
400 | | dirstate_nodes: ChildNodesRef<'tree, 'on_disk>,
... |
404 | | is_at_repo_root: bool,
405 | | ) -> Result<bool, DirstateV2ParseError> {
| |___________________________________________^
|
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
= help: specify the types explicitly
note: in edition 2024, the requirement `!: rayon::iter::FromParallelIterator<()>` will fail
--> hg-core/src/dirstate_tree/status.rs:453:28
|
453 | .collect::<Result<_, _>>()?;
| ^^^^^^^^^^^^
= note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
```
syntax: glob
*.elc
*.tmp
*.orig
*.rej
*~
*.mergebackup
*.o
*.so
*.dll
*.exe
*.pyd
*.pyc
*.pyo
*$py.class
*.swp
*.prof
*.zip
\#*\#
.\#*
result/
tests/artifacts/cache/big-file-churn.hg
tests/.coverage*
tests/.testtimes*
# the file is written in the CWD when run-tests is run.
.testtimes
tests/.hypothesis
tests/hypothesis-generated
tests/annotated
tests/exceptions
tests/python3
tests/*.err
tests/htmlcov
build
contrib/chg/chg
contrib/hgsh/hgsh
contrib/vagrant/.vagrant
contrib/merge-lists/target/
dist
packages
doc/common.txt
doc/commandlist.txt
doc/extensionlist.txt
doc/topiclist.txt
doc/*.mk
doc/*.[0-9]
doc/*.[0-9].txt
doc/*.[0-9].gendoc.txt
doc/*.[0-9].{x,ht}ml
doc/build
doc/html
doc/man
MANIFEST
MANIFEST.in
patches
mercurial/__modulepolicy__.py
mercurial/__version__.py
mercurial/hgpythonlib.h
mercurial.egg-info
.DS_Store
tags
cscope.*
.vscode/*
.idea/*
.asv/*
.pytype/*
.mypy_cache
i18n/hg.pot
locale/*/LC_MESSAGES/hg.mo
hgext/__index__.py
rust/target/
rust/*/target/
# Generated wheels
wheelhouse/
syntax: rootglob
# See Profiling in rust/README.rst
.cargo/config
syntax: regexp
^\.pc/
^\.(pydev)?project
# hackable windows distribution additions
^hg-python
^hg.py$