Derive Debug for Router instead of implementing manually (#463)

axum/src/routing/mod.rs

@@ -62,6 +62,7 @@ impl RouteId {
 }
 
 /// The router type for composing handlers and services.
+#[derive(Debug)]
 pub struct Router<B = Body> {
     routes: HashMap<RouteId, Route<B>>,
     node: Node,
@@ -87,16 +88,6 @@ where
     }
 }
 
-impl<B> fmt::Debug for Router<B> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Router")
-            .field("routes", &self.routes)
-            .field("node", &self.node)
-            .field("fallback", &self.fallback)
-            .finish()
-    }
-}
-
 pub(crate) const NEST_TAIL_PARAM: &str = "axum_nest";
 const NEST_TAIL_PARAM_CAPTURE: &str = "/*axum_nest";