/libp2p-troubleshoot

Primary LanguageRust

This repository serves the purpose of showcasing a broken interaction between libp2p 0.49.0 and libp2p-swarm-derive when using both of those dependencies within a library. See libp2p/rust-libp2p#3176 for context.

cargo check works for this project because that command considers the Cargo.lock file. libp2p-swarm-derive is locked to 0.30.1 via Cargo.lock, which is compatible with libp2p 0.49.0.

cargo package does not work for this project because that command does not consider the Cargo.lock file. Disregarding the lockfile causes cargo to use libp2p-swarm-derive 0.30.2 due to the [dependencies.libp2p-swarm-derive] version = "0.30.1" section of libp2p 0.49.0 's Cargo.toml. libp2p-swarm-derive 0.30.2 is supposed to be compatible with libp2p 0.49.0, but actually isn't; a fix for that is underway.

Here's the error message for cargo package:

error[E0433]: failed to resolve: could not find `derive_prelude` in `swarm`
 --> src/lib.rs:4:10
  |
4 | #[derive(NetworkBehaviour)]
  |          ^^^^^^^^^^^^^^^^ could not find `derive_prelude` in `swarm`
  |
  = note: this error originates in the derive macro `NetworkBehaviour` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0432]: unresolved import `libp2p`
 --> src/lib.rs:4:10
  |
4 | #[derive(NetworkBehaviour)]
  |          ^^^^^^^^^^^^^^^^ could not find `derive_prelude` in `swarm`
  |
  = note: this error originates in the derive macro `NetworkBehaviour` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0433]: failed to resolve: could not find `derive_prelude` in `swarm`
 --> src/lib.rs:4:10
  |
4 | #[derive(NetworkBehaviour)]
  |          ^^^^^^^^^^^^^^^^ not found in `libp2p::swarm::derive_prelude`
  |
  = note: this error originates in the derive macro `NetworkBehaviour` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this trait
  |
1 | use libp2p_swarm::NetworkBehaviour;
  |
help: if you import `NetworkBehaviour`, refer to it directly
  |
4 | #[derive(NetworkBehaviour)]
  |

error[E0433]: failed to resolve: could not find `derive_prelude` in `swarm`
 --> src/lib.rs:4:10
  |
4 | #[derive(NetworkBehaviour)]
  |          ^^^^^^^^^^^^^^^^ not found in `libp2p::swarm::derive_prelude`
  |
  = note: this error originates in the derive macro `NetworkBehaviour` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this enum
  |
1 | use libp2p_swarm::NetworkBehaviourAction;
  |
help: if you import `NetworkBehaviourAction`, refer to it directly
  |
4 | #[derive(NetworkBehaviour)]
  |