chore: misc clippy lints

cli/loader/src/lib.rs

@@ -68,7 +68,7 @@ impl PathsJSON {
         }
     }
 
-    fn is_empty(&self) -> bool {
+    const fn is_empty(&self) -> bool {
         matches!(self, Self::Empty)
     }
 }
@@ -141,6 +141,7 @@ pub struct TreeSitterJSON {
 }
 
 impl TreeSitterJSON {
+    #[must_use]
     pub fn from_file(path: &Path) -> Option<Self> {
         if let Ok(file) = fs::File::open(path.join("tree-sitter.json")) {
             Some(serde_json::from_reader(file).ok()?)
@@ -149,6 +150,7 @@ impl TreeSitterJSON {
         }
     }
 
+    #[must_use]
     pub fn has_multiple_language_configs(&self) -> bool {
         self.grammars.len() > 1
     }
@@ -366,7 +368,6 @@ impl<'a> CompileConfig<'a> {
     }
 }
 
-unsafe impl Send for Loader {}
 unsafe impl Sync for Loader {}
 
 impl Loader {
@@ -1004,7 +1005,7 @@ impl Loader {
                 let mut command = match source {
                     EmccSource::Docker => Command::new("docker"),
                     EmccSource::Podman => Command::new("podman"),
-                    _ => unreachable!(),
+                    EmccSource::Native => unreachable!(),
                 };
                 command.args(["run", "--rm"]);
 
@@ -1344,7 +1345,7 @@ impl Loader {
     }
 }
 
-impl<'a> LanguageConfiguration<'a> {
+impl LanguageConfiguration<'_> {
     #[cfg(feature = "tree-sitter-highlight")]
     pub fn highlight_config(
         &self,