wayland.backend.egl: derive Debug for Format

src/backend/graphics/egl/wayland.rs

@@ -137,6 +137,7 @@ impl ::std::error::Error for TextureCreationError {
 /// Texture format types
 #[repr(i32)]
 #[allow(non_camel_case_types)]
+#[derive(Debug)]
 pub enum Format {
     /// RGB format
     RGB = ffi::egl::TEXTURE_RGB as i32,