internal: prepare to track changes to mem_docs

crates/rust-analyzer/src/reload.rs

@@ -403,7 +403,7 @@ impl GlobalState {
             let mut load = |path: &AbsPath| {
                 let _p = profile::span("GlobalState::load");
                 let vfs_path = vfs::VfsPath::from(path.to_path_buf());
-                if !mem_docs.contains_key(&vfs_path) {
+                if !mem_docs.contains(&vfs_path) {
                     let contents = loader.handle.load_sync(path);
                     vfs.set_file_contents(vfs_path.clone(), contents);
                 }