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&gt; = 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 ```