Use a named type

crates/ruff_db/src/system/memory_fs.rs

@@ -241,7 +241,7 @@ impl MemoryFileSystem {
     pub fn read_directory(
         &self,
         path: impl AsRef<SystemPath>,
-    ) -> Result<impl Iterator<Item = Result<DirectoryEntry>> + '_> {
+    ) -> Result<std::vec::IntoIter<Result<DirectoryEntry>>> {
         let by_path = self.inner.by_path.read().unwrap();
         let normalized = self.normalize_path(path.as_ref());
         let entry = by_path.get(&normalized).ok_or_else(not_found)?;