diff --git a/hostcontrol/src/main.rs b/hostcontrol/src/main.rs
index a3f97a8..4b1eb15 100644
--- a/hostcontrol/src/main.rs
+++ b/hostcontrol/src/main.rs
@@ -54,14 +54,9 @@ fn main() {
     sleep(Duration::from_secs(5));
 }
 
+#[derive(Default)]
 struct App {}
 
-impl Default for App {
-    fn default() -> Self {
-        App {}
-    }
-}
-
 impl eframe::App for App {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         egui::CentralPanel::default().show(ctx, |ui| {
diff --git a/hostcontrol/src/stage_io.rs b/hostcontrol/src/stage_io.rs
index d0cec47..1ffca22 100644
--- a/hostcontrol/src/stage_io.rs
+++ b/hostcontrol/src/stage_io.rs
@@ -35,7 +35,7 @@ impl StageIO {
             let mut buf = [0u8; 1];
             self.serial
                 .read_exact(&mut buf)
-                .map_err(|e| StageIOError::Read(e))?;
+                .map_err(StageIOError::Read)?;
             res.push(buf[0]);
             if res.ends_with(needle.as_ref().as_bytes()) {
                 return Ok(String::from_utf8_lossy(&res).to_string());
@@ -48,7 +48,7 @@ impl StageIO {
         debug!("->: {:?}", command.as_ref());
         self.serial
             .write_all(command.as_ref().as_bytes())
-            .map_err(|e| StageIOError::Write(e))?;
+            .map_err(StageIOError::Write)?;
         let response = self.receive_until("\n")?;
         debug!("<-: {:?}", response);
         Ok(response.trim().to_string())