4 files changed, 41 insertions, 33 deletions

diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 867f2bd1f0e..818aab35157 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -723,7 +723,10 @@ impl Config {
         FilesConfig {
             watcher: match self.data.files_watcher.as_str() {
                 "notify" => FilesWatcher::Notify,
-                "client" | _ => FilesWatcher::Client,
+                "client" if self.did_change_watched_files_dynamic_registration() => {
+                    FilesWatcher::Client
+                }
+                _ => FilesWatcher::Notify,
             },
             exclude: self.data.files_excludeDirs.iter().map(|it| self.root_path.join(it)).collect(),
         }
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index 7ba56971762..b14b3dbcfa9 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -241,38 +241,33 @@ impl GlobalState {
         }
 
         if let FilesWatcher::Client = self.config.files().watcher {
-            if self.config.did_change_watched_files_dynamic_registration() {
-                let registration_options = lsp_types::DidChangeWatchedFilesRegistrationOptions {
-                    watchers: self
-                        .workspaces
-                        .iter()
-                        .flat_map(|ws| ws.to_roots())
-                        .filter(|it| it.is_local)
-                        .flat_map(|root| {
-                            root.include.into_iter().flat_map(|it| {
-                                [
-                                    format!("{}/**/*.rs", it.display()),
-                                    format!("{}/**/Cargo.toml", it.display()),
-                                    format!("{}/**/Cargo.lock", it.display()),
-                                ]
-                            })
-                        })
-                        .map(|glob_pattern| lsp_types::FileSystemWatcher {
-                            glob_pattern,
-                            kind: None,
+            let registration_options = lsp_types::DidChangeWatchedFilesRegistrationOptions {
+                watchers: self
+                    .workspaces
+                    .iter()
+                    .flat_map(|ws| ws.to_roots())
+                    .filter(|it| it.is_local)
+                    .flat_map(|root| {
+                        root.include.into_iter().flat_map(|it| {
+                            [
+                                format!("{}/**/*.rs", it.display()),
+                                format!("{}/**/Cargo.toml", it.display()),
+                                format!("{}/**/Cargo.lock", it.display()),
+                            ]
                         })
-                        .collect(),
-                };
-                let registration = lsp_types::Registration {
-                    id: "workspace/didChangeWatchedFiles".to_string(),
-                    method: "workspace/didChangeWatchedFiles".to_string(),
-                    register_options: Some(serde_json::to_value(registration_options).unwrap()),
-                };
-                self.send_request::<lsp_types::request::RegisterCapability>(
-                    lsp_types::RegistrationParams { registrations: vec![registration] },
-                    |_, _| (),
-                );
-            }
+                    })
+                    .map(|glob_pattern| lsp_types::FileSystemWatcher { glob_pattern, kind: None })
+                    .collect(),
+            };
+            let registration = lsp_types::Registration {
+                id: "workspace/didChangeWatchedFiles".to_string(),
+                method: "workspace/didChangeWatchedFiles".to_string(),
+                register_options: Some(serde_json::to_value(registration_options).unwrap()),
+            };
+            self.send_request::<lsp_types::request::RegisterCapability>(
+                lsp_types::RegistrationParams { registrations: vec![registration] },
+                |_, _| (),
+            );
         }
 
         let mut change = Change::new();
diff --git a/crates/rust-analyzer/tests/slow-tests/support.rs b/crates/rust-analyzer/tests/slow-tests/support.rs
index a8c2a5bb615..6e7ecec5b2b 100644
--- a/crates/rust-analyzer/tests/slow-tests/support.rs
+++ b/crates/rust-analyzer/tests/slow-tests/support.rs
@@ -101,6 +101,14 @@ impl<'a> Project<'a> {
         let mut config = Config::new(
             tmp_dir_path,
             lsp_types::ClientCapabilities {
+                workspace: Some(lsp_types::WorkspaceClientCapabilities {
+                    did_change_watched_files: Some(
+                        lsp_types::DidChangeWatchedFilesClientCapabilities {
+                            dynamic_registration: Some(true),
+                        },
+                    ),
+                    ..Default::default()
+                }),
                 text_document: Some(lsp_types::TextDocumentClientCapabilities {
                     definition: Some(lsp_types::GotoCapability {
                         link_support: Some(true),
diff --git a/crates/rust-analyzer/tests/slow-tests/testdir.rs b/crates/rust-analyzer/tests/slow-tests/testdir.rs
index c7e5c218064..3bec23a9117 100644
--- a/crates/rust-analyzer/tests/slow-tests/testdir.rs
+++ b/crates/rust-analyzer/tests/slow-tests/testdir.rs
@@ -52,7 +52,9 @@ impl Drop for TestDir {
         if self.keep {
             return;
         }
-        remove_dir_all(&self.path).unwrap()
+        remove_dir_all(&self.path).unwrap_or_else(|err| {
+            panic!("failed to remove temporary directory {}: {}", self.path.display(), err)
+        })
     }
 }