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

@@ -32,13 +32,8 @@ impl FilesIndex {
         if start == self.0.len() {
             return None;
         }
-        let prefixed_items;
         let end = self.0[start..].partition_point(|(k, _)| k.starts_with(prefix));
-        if end + start == self.0.len() {
-            prefixed_items = &self.0[start..];
-        } else {
-            prefixed_items = &self.0[start..start + end];
-        }
+        let prefixed_items = &self.0[start..][..end];
 
         let ret = prefixed_items.into_iter().filter_map(move |(k, v)| {
             k.ends_with(suffix).then(|| {