style: avoid using .to_owned()/.to_vec() on owned objects

`.clone()` is more explicit when we already have an object
of the right type.

Cargo.toml

@@ -134,6 +134,7 @@ testutils = { path = "lib/testutils" }
 
 [workspace.lints.clippy]
 explicit_iter_loop = "deny"
+implicit_clone = "deny"
 semicolon_if_nothing_returned = "deny"
 uninlined_format_args = "deny"
 

cli/src/commands/fix.rs

@@ -173,7 +173,7 @@ pub(crate) fn cmd_fix(
     // reliably produce well formatted code anyway. Deduplicating inputs helps
     // to prevent quadratic growth in the number of tool executions required for
     // doing this in long chains of commits with disjoint sets of modified files.
-    let commits: Vec<_> = RevsetExpression::commits(root_commits.to_vec())
+    let commits: Vec<_> = RevsetExpression::commits(root_commits.clone())
         .descendants()
         .evaluate_programmatic(tx.base_repo().as_ref())?
         .iter()

cli/src/config.rs

@@ -323,7 +323,7 @@ impl LayeredConfigs {
                         config_vals.push(AnnotatedValue {
                             path,
                             value: value.to_owned(),
-                            source: source.to_owned(),
+                            source: source.clone(),
                             // Note: Value updated below.
                             is_overridden: false,
                         });
@@ -888,8 +888,8 @@ mod tests {
     fn test_layered_configs_resolved_config_values_empty() {
         let empty_config = config::Config::default();
         let layered_configs = LayeredConfigs {
-            default: empty_config.to_owned(),
-            env_base: empty_config.to_owned(),
+            default: empty_config.clone(),
+            env_base: empty_config.clone(),
             user: None,
             repo: None,
             env_overrides: empty_config,
@@ -919,7 +919,7 @@ mod tests {
             .build()
             .unwrap();
         let layered_configs = LayeredConfigs {
-            default: empty_config.to_owned(),
+            default: empty_config.clone(),
             env_base: env_base_config,
             user: None,
             repo: Some(repo_config),
@@ -1042,8 +1042,8 @@ mod tests {
             .build()
             .unwrap();
         let layered_configs = LayeredConfigs {
-            default: empty_config.to_owned(),
-            env_base: empty_config.to_owned(),
+            default: empty_config.clone(),
+            env_base: empty_config.clone(),
             user: Some(user_config),
             repo: Some(repo_config),
             env_overrides: empty_config,

cli/tests/test_config_command.rs

@@ -183,7 +183,7 @@ fn test_config_list_layer() {
     let mut test_env = TestEnvironment::default();
     test_env.jj_cmd_ok(test_env.env_root(), &["git", "init", "repo"]);
     let user_config_path = test_env.config_path().join("config.toml");
-    test_env.set_config_path(user_config_path.to_owned());
+    test_env.set_config_path(user_config_path.clone());
     let repo_path = test_env.env_root().join("repo");
 
     // User
@@ -456,7 +456,7 @@ fn test_config_set_for_user() {
     test_env.jj_cmd_ok(test_env.env_root(), &["git", "init", "repo"]);
     // Point to a config file since `config set` can't handle directories.
     let user_config_path = test_env.config_path().join("config.toml");
-    test_env.set_config_path(user_config_path.to_owned());
+    test_env.set_config_path(user_config_path.clone());
     let repo_path = test_env.env_root().join("repo");
 
     test_env.jj_cmd_ok(
@@ -840,7 +840,7 @@ fn test_config_show_paths() {
     let mut test_env = TestEnvironment::default();
     test_env.jj_cmd_ok(test_env.env_root(), &["git", "init", "repo"]);
     let user_config_path = test_env.config_path().join("config.toml");
-    test_env.set_config_path(user_config_path.to_owned());
+    test_env.set_config_path(user_config_path.clone());
     let repo_path = test_env.env_root().join("repo");
 
     test_env.jj_cmd_ok(

cli/tests/test_operations.rs

@@ -738,7 +738,7 @@ fn test_op_recover_from_bad_gc() {
     let repo_path = test_env.env_root().join("repo");
     let git_object_path = |hex: &str| {
         let (shard, file_name) = hex.split_at(2);
-        let mut file_path = repo_path.to_owned();
+        let mut file_path = repo_path.clone();
         file_path.extend([".git", "objects", shard, file_name]);
         file_path
     };

lib/src/git_backend.rs

@@ -957,7 +957,7 @@ impl Backend for GitBackend {
             .map_err(|err| to_read_object_err(err, id))?;
         let target = String::from_utf8(blob.take_data())
             .map_err(|err| to_invalid_utf8_err(err.utf8_error(), id))?
-            .to_owned();
+            .clone();
         Ok(target)
     }
 

lib/src/local_backend.rs

@@ -388,7 +388,7 @@ fn commit_from_proto(mut proto: crate::protos::local_store::Commit) -> Commit {
         MergedTreeId::Merge(merge_builder.build())
     } else {
         assert_eq!(proto.root_tree.len(), 1);
-        MergedTreeId::Legacy(TreeId::new(proto.root_tree[0].to_vec()))
+        MergedTreeId::Legacy(TreeId::new(proto.root_tree[0].clone()))
     };
     let change_id = ChangeId::new(proto.change_id);
     Commit {

lib/src/repo.rs

@@ -1131,7 +1131,7 @@ impl MutableRepo {
                 let commit = self
                     .new_commit(
                         settings,
-                        new_commit_ids.to_vec(),
+                        new_commit_ids.clone(),
                         merged_parents_tree.id().clone(),
                     )
                     .write()?;

lib/src/settings.rs

@@ -171,7 +171,7 @@ impl UserSettings {
     pub const USER_EMAIL_PLACEHOLDER: &'static str = "(no email configured)";
 
     pub fn commit_timestamp(&self) -> Option<Timestamp> {
-        self.timestamp.to_owned()
+        self.timestamp
     }
 
     pub fn operation_timestamp(&self) -> Option<Timestamp> {

lib/src/workspace.rs

@@ -609,8 +609,8 @@ impl WorkspaceLoader for DefaultWorkspaceLoader {
     ) -> Result<Box<dyn WorkingCopy>, WorkspaceLoadError> {
         Ok(working_copy_factory.load_working_copy(
             store.clone(),
-            self.workspace_root.to_owned(),
-            self.working_copy_state_path.to_owned(),
+            self.workspace_root.clone(),
+            self.working_copy_state_path.clone(),
         )?)
     }
 }

lib/tests/test_local_working_copy.rs

@@ -234,7 +234,7 @@ fn test_checkout_file_transitions(backend: TestRepoBackend) {
             let path = RepoPathBuf::from_internal_string(format!("{left_kind:?}_{right_kind:?}"));
             write_path(&settings, repo, &mut left_tree_builder, *left_kind, &path);
             write_path(&settings, repo, &mut right_tree_builder, *right_kind, &path);
-            files.push((*left_kind, *right_kind, path.to_owned()));
+            files.push((*left_kind, *right_kind, path.clone()));
         }
     }
     let left_tree_id = left_tree_builder.write_tree(&store).unwrap();