swarm-derive: Specify NetworkBehaviour by full path (libp2p#2932)

Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
Co-authored-by: Max Inden <mail@max-inden.de>

swarm-derive/CHANGELOG.md

@@ -2,8 +2,10 @@
 
 - Fix an issue where the derive would generate bad code if the type parameters between the behaviour and a custom
   out event differed. See [PR 2907].
+- Fix an issue where the derive would generate incorrect code depending on available imports. See [PR 2921].
 
 [PR 2907]: https://github.com/libp2p/rust-libp2p/pull/2907
+[PR 2921]: https://github.com/libp2p/rust-libp2p/pull/2921
 
 # 0.30.0
 

swarm-derive/src/lib.rs

@@ -125,7 +125,7 @@ fn build_struct(ast: &DeriveInput, data_struct: &DataStruct) -> TokenStream {
                             )
                             .unwrap();
                             let ty = &field.ty;
-                            quote! {#variant(<#ty as NetworkBehaviour>::OutEvent)}
+                            quote! {#variant(<#ty as #trait_to_impl>::OutEvent)}
                         })
                         .collect::<Vec<_>>();
                     let visibility = &ast.vis;