more fixes

src/engine/dispatcher.rs

@@ -85,7 +85,7 @@ pub fn dispatcher_loop(
         let current_us = link.clock_micros() as SyncTime;
         while let Some(cmd) = queue.peek() {
             if cmd.target_time_us <= current_us + SPIN_THRESHOLD_US {
-                let cmd = queue.pop().unwrap();
+                let cmd = queue.pop().expect("pop after peek");
                 wait_until_dispatch(cmd.target_time_us, &link, has_rt);
                 dispatch_midi(cmd.command, &midi_tx);
             } else {
@@ -149,8 +149,8 @@ mod tests {
             target_time_us: 200,
         });
 
-        assert_eq!(heap.pop().unwrap().target_time_us, 100);
-        assert_eq!(heap.pop().unwrap().target_time_us, 200);
-        assert_eq!(heap.pop().unwrap().target_time_us, 300);
+        assert_eq!(heap.pop().expect("heap non-empty").target_time_us, 100);
+        assert_eq!(heap.pop().expect("heap non-empty").target_time_us, 200);
+        assert_eq!(heap.pop().expect("heap non-empty").target_time_us, 300);
     }
 }