diff --git a/src/compositor.rs b/src/compositor.rs
index ba0f4ad34..67f6062b8 100644
--- a/src/compositor.rs
+++ b/src/compositor.rs
@@ -25,20 +25,21 @@ pub trait CompositorHandler: Sized {
     /// The surface has either been moved into or out of an output and the output has a different scale factor.
     fn scale_factor_changed(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        surface: &wl_surface::WlSurface,
-        new_factor: i32,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _surface: &wl_surface::WlSurface,
+        _new_factor: i32,
+    ) { /* No-op default impl */ }
 
     /// The surface has either been moved into or out of an output and the output has different transform.
     fn transform_changed(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        surface: &wl_surface::WlSurface,
-        new_transform: wl_output::Transform,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _surface: &wl_surface::WlSurface,
+        _new_transform: wl_output::Transform,
+    ) { /* No-op default impl */ }
+
 
     /// A frame callback has been completed.
     ///
@@ -52,29 +53,30 @@ pub trait CompositorHandler: Sized {
     /// for other values to more easily dispatch rendering for specific surface types.
     fn frame(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        surface: &wl_surface::WlSurface,
-        time: u32,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _surface: &wl_surface::WlSurface,
+        _time: u32,
+    ) { /* No-op default impl */ }
+
 
     /// The surface has entered an output.
     fn surface_enter(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        surface: &wl_surface::WlSurface,
-        output: &wl_output::WlOutput,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _surface: &wl_surface::WlSurface,
+        _output: &wl_output::WlOutput,
+    ) { /* No-op default impl */ }
 
     /// The surface has left an output.
     fn surface_leave(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        surface: &wl_surface::WlSurface,
-        output: &wl_output::WlOutput,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _surface: &wl_surface::WlSurface,
+        _output: &wl_output::WlOutput,
+    ) { /* No-op default impl */ }
 }
 
 pub trait SurfaceDataExt: Send + Sync {
diff --git a/src/output.rs b/src/output.rs
index c2dc47446..24c7a0279 100644
--- a/src/output.rs
+++ b/src/output.rs
@@ -28,28 +28,28 @@ pub trait OutputHandler: Sized {
     /// A new output has been advertised.
     fn new_output(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        output: wl_output::WlOutput,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _output: wl_output::WlOutput,
+    ) { /* No-op default impl */ }
 
     /// An existing output has changed.
     fn update_output(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        output: wl_output::WlOutput,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _output: wl_output::WlOutput,
+    ) { /* No-op default impl */ }
 
     /// An output is no longer advertised.
     ///
     /// The info passed to this function was the state of the output before destruction.
     fn output_destroyed(
         &mut self,
-        conn: &Connection,
-        qh: &QueueHandle<Self>,
-        output: wl_output::WlOutput,
-    );
+        _conn: &Connection,
+        _qh: &QueueHandle<Self>,
+        _output: wl_output::WlOutput,
+    ) { /* No-op default impl */ }
 }
 
 type ScaleWatcherFn =