1 files changed, 6 insertions, 4 deletions

diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index 81fd08c91..dda318e43 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -305,7 +305,6 @@ fn loop_turn(
         log::info!("queued count = {}", queue_count);
     }
 
-    let mut state_changed = false;
     match event {
         Event::Task(task) => {
             on_task(task, &connection.sender, &mut loop_state.pending_requests, world_state);
@@ -313,7 +312,6 @@ fn loop_turn(
         }
         Event::Vfs(task) => {
             world_state.vfs.write().handle_task(task);
-            state_changed = true;
         }
         Event::Lib(lib) => {
             world_state.add_lib(lib);
@@ -338,7 +336,6 @@ fn loop_turn(
                     &mut loop_state.subscriptions,
                     not,
                 )?;
-                state_changed = true;
             }
             Message::Response(resp) => {
                 let removed = loop_state.pending_responses.remove(&resp.id);
@@ -349,7 +346,12 @@ fn loop_turn(
         },
     };
 
-    loop_state.pending_libraries.extend(world_state.process_changes());
+    let mut state_changed = false;
+    if let Some(changes) = world_state.process_changes() {
+        state_changed = true;
+        loop_state.pending_libraries.extend(changes);
+    }
+
     while loop_state.in_flight_libraries < MAX_IN_FLIGHT_LIBS
         && !loop_state.pending_libraries.is_empty()
     {