Update compiler/rustc_session/src/search_paths.rs

Co-authored-by: Ben Kimock <kimockb@gmail.com>

Author: osiewicz

compiler/rustc_session/src/search_paths.rs

@@ -27,8 +27,7 @@ impl FilesIndex {
     ) -> Option<impl Iterator<Item = (String, &'this SearchPathFile)> + use<'this, 'prefix, 'suffix>>
     {
         let start = self.0.partition_point(|(k, _)| {
-            let k: &str = &k;
-            k < prefix
+            **k < *prefix
         });
         if start == self.0.len() {
             return None;