examples/ping build errors

[wvdji]

error[E0432]: unresolved import libp2p::ping
--> src/main.rs:26:24
|
26 | use libp2p::{identity, ping, Multiaddr, PeerId};
| ^^^^ no ping in the root

error[E0432]: unresolved import libp2p_swarm
--> src/main.rs:27:5
|
27 | use libp2p_swarm::keep_alive;
| ^^^^^^^^^^^^ use of undeclared crate or module libp2p_swarm

error[E0433]: failed to resolve: use of undeclared crate or module async_std
--> src/main.rs:30:3
|
30 | #[async_std::main]
| ^^^^^^^^^ use of undeclared crate or module async_std

error[E0425]: cannot find function development_transport in crate libp2p
--> src/main.rs:36:29
|
36 | let transport = libp2p::development_transport(local_key).await?;
| ^^^^^^^^^^^^^^^^^^^^^ not found in libp2p

error[E0599]: no method named select_next_some found for struct Swarm in the current scope
--> src/main.rs:53:21
|
53 | match swarm.select_next_some().await {
| ^^^^^^^^^^^^^^^^ method not found in Swarm<Behaviour>

[umgefahren]

Could you give a bit more context here? What exactly is the issue and could you give the complete code? From the first look of it you copy-and-pastet the ping example into a project of your own, but you forgot to enable the necessary features of libp2p and add the libp2p_swarm dependency.

[dariusc93]

I agree with @umgefahren, Although the errors dont provide much context, it only make me assume you didnt have all of the dependencies apart of your project as well as having the features enabled in your Cargo.toml.

[thomaseizinger]

Related: #3111

[wvdji]

Sorry, I'm new to Rust. Problem solved.

[umgefahren]

No problem

Part of the problem might be the fact that the ping example uses libp2p_swarm instead of libp2p.