Reduce clones in crate input file calculation

Author: Xanewok

rls/src/build/rustc.rs

@@ -188,11 +188,10 @@ impl rustc_driver::Callbacks for RlsRustcCalls {
                 RustcEdition::Edition2018 => Edition::Edition2018,
             },
         };
-        let files = fetch_input_files(sess);
 
         let mut input_files = self.input_files.lock().unwrap();
-        for file in &files {
-            input_files.entry(file.to_path_buf()).or_default().insert(krate.clone());
+        for file in fetch_input_files(sess) {
+            input_files.entry(file).or_default().insert(krate.clone());
         }
 
         // Guaranteed to not be dropped yet in the pipeline thanks to the
@@ -285,7 +284,6 @@ fn fetch_input_files(sess: &Session) -> Vec<PathBuf> {
         .filter(|fmap| !fmap.is_imported())
         .map(|fmap| fmap.name.to_string())
         .map(|fmap| src_path(Some(cwd), fmap).unwrap())
-        .map(PathBuf::from)
         .collect()
 }