Pop an error notification when flycheck can't be restarted

crates/flycheck/src/lib.rs

@@ -125,6 +125,7 @@ pub enum Progress {
     DidCheckCrate(String),
     DidFinish(io::Result<()>),
     DidCancel,
+    DidFailToRestart(String),
 }
 
 enum Restart {
@@ -193,10 +194,11 @@ fn run(mut self, inbox: Receiver<Restart>) {
                             self.progress(Progress::DidStart);
                         }
                         Err(error) => {
-                            tracing::error!(
-                                command = ?self.check_command(),
-                                %error, "failed to restart flycheck"
-                            );
+                            self.progress(Progress::DidFailToRestart(format!(
+                                "Failed to run the following command: {:?} error={}",
+                                self.check_command(),
+                                error
+                            )));
                         }
                     }
                 }

crates/rust-analyzer/src/main_loop.rs

@@ -529,6 +529,13 @@ fn handle_flycheck_msg(&mut self, message: flycheck::Message) {
                     }
                     flycheck::Progress::DidCheckCrate(target) => (Progress::Report, Some(target)),
                     flycheck::Progress::DidCancel => (Progress::End, None),
+                    flycheck::Progress::DidFailToRestart(err) => {
+                        self.show_and_log_error(
+                            "cargo check failed".to_string(),
+                            Some(err.to_string()),
+                        );
+                        return;
+                    }
                     flycheck::Progress::DidFinish(result) => {
                         if let Err(err) = result {
                             self.show_and_log_error(