Improve opaque error message for Handler::layer (#1336)

davidpdrsn · web-flow · commit 3f92f7d25404 · 2022-08-28T22:17:05.000+02:00
diff --git a/axum/src/handler/mod.rs b/axum/src/handler/mod.rs
@@ -140,7 +140,7 @@ pub trait Handler<T, S, B = Body>: Clone + Send + Sized + 'static {
     /// ```
     fn layer<L>(self, layer: L) -> Layered<L, Self, T, S, B>
     where
-        L: Layer<WithState<Self, T, S, B>>,
+        L: Layer<WithState<Self, T, S, B>> + Clone,
     {
         Layered {
             layer,

Original file line number	Diff line number	Diff line change
`@@ -140,7 +140,7 @@ pub trait Handler<T, S, B = Body>: Clone + Send + Sized + 'static {`
`140`	`140`	/// ```
`141`	`141`	`fn layer<L>(self, layer: L) -> Layered<L, Self, T, S, B>`
`142`	`142`	`where`
`143`		`- L: Layer<WithState<Self, T, S, B>>,`
	`143`	`+ L: Layer<WithState<Self, T, S, B>> + Clone,`
`144`	`144`	`{`
`145`	`145`	`Layered {`
`146`	`146`	`layer,`