Disambiguate calls to NetworkBehaviour::inject_event

[thomaseizinger]

There is a gnarly edge-case with the custom-derive where rustc cannot disambiguate the call if:

• The NetworkBehaviourEventProcess trait is imported
• We nest NetworkBehaviours that use the custom-derive

Without this patch, the test errors with:

error[E0034]: multiple applicable items in scope
   --> misc/core-derive/tests/test.rs:219:14
    |
219 |     #[derive(NetworkBehaviour)]
    |              ^^^^^^^^^^^^^^^^ multiple `inject_event` found
    |
note: candidate #1 is defined in an impl of the trait `libp2p_swarm::behaviour::NetworkBehaviourEventProcess` for the type `nested_derives_with_import::Foo`
   --> misc/core-derive/tests/test.rs:225:9
    |
225 |         fn inject_event(&mut self, _: libp2p::ping::PingEvent) {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: candidate #2 is defined in an impl of the trait `libp2p_swarm::behaviour::NetworkBehaviour` for the type `nested_derives_with_import::Foo`
   --> misc/core-derive/tests/test.rs:213:14
    |
213 |     #[derive(NetworkBehaviour)]
    |              ^^^^^^^^^^^^^^^^
help: disambiguate the method call for candidate #1
    |
219 |     #[derive(libp2p_swarm::behaviour::NetworkBehaviourEventProcess::inject_event(&mut NetworkBehaviour, NetworkBehaviour, NetworkBehaviour, NetworkBehaviour))]
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: disambiguate the method call for candidate #2
    |
219 |     #[derive(libp2p_swarm::behaviour::NetworkBehaviour::inject_event(&mut NetworkBehaviour, NetworkBehaviour, NetworkBehaviour, NetworkBehaviour))]
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[tomaka]

Small nit

[tomaka]

I pushed a fix on your branch.

[thomaseizinger]

Thanks! Sorry, I didn't realize the build was broken :s