diff rust/hg-core/src/matchers.rs @ 44973:26114bd6ec60

rust: do a clippy pass

This is the result of running `cargo clippy` on hg-core/hg-cpython and fixing
the lints that do not require too much code churn (and would warrant a separate
commit/complete refactor) and only come from our code (a lot of warnings in
hg-cpython come from `rust-cpython`).

Most of those were good lints, two of them was the linter not being smart
enough (or compiler to get up to `clippy`'s level depending on how you see it).

Maybe in the future we could have `clippy` be part of the CI.

Differential Revision: https://phab.mercurial-scm.org/D8635

--- a/rust/hg-core/src/matchers.rs	Mon Jun 15 15:14:16 2020 -0400
+++ b/rust/hg-core/src/matchers.rs	Mon Jun 15 18:26:40 2020 +0200
@@ -164,7 +164,7 @@
         files: &'a [impl AsRef<HgPath>],
     ) -> Result<Self, DirstateMapError> {
         Ok(Self {
-            files: HashSet::from_iter(files.iter().map(|f| f.as_ref())),
+            files: HashSet::from_iter(files.iter().map(AsRef::as_ref)),
             dirs: DirsMultiset::from_manifest(files)?,
         })
     }
@@ -190,10 +190,10 @@
         if self.files.is_empty() || !self.dirs.contains(&directory) {
             return VisitChildrenSet::Empty;
         }
-        let dirs_as_set = self.dirs.iter().map(|k| k.deref()).collect();
+        let dirs_as_set = self.dirs.iter().map(Deref::deref).collect();
 
         let mut candidates: HashSet<&HgPath> =
-            self.files.union(&dirs_as_set).map(|k| *k).collect();
+            self.files.union(&dirs_as_set).cloned().collect();
         candidates.remove(HgPath::new(b""));
 
         if !directory.as_ref().is_empty() {
@@ -470,7 +470,7 @@
                 _ => unreachable!(),
             })?
             .iter()
-            .map(|k| k.to_owned()),
+            .map(ToOwned::to_owned),
     );
     parents.extend(
         DirsMultiset::from_manifest(&roots)
@@ -479,7 +479,7 @@
                 _ => unreachable!(),
             })?
             .iter()
-            .map(|k| k.to_owned()),
+            .map(ToOwned::to_owned),
     );
 
     Ok(RootsDirsAndParents {
@@ -523,7 +523,7 @@
         let match_subinclude = move |filename: &HgPath| {
             for prefix in prefixes.iter() {
                 if let Some(rel) = filename.relative_to(prefix) {
-                    if (submatchers.get(prefix).unwrap())(rel) {
+                    if (submatchers[prefix])(rel) {
                         return true;
                     }
                 }