chore: deprecate async-io support in mDNS crate

protocols/mdns/Cargo.toml

@@ -28,6 +28,7 @@ hickory-proto = { workspace = true, features = ["mdns"] }
 [features]
 tokio = ["dep:tokio", "if-watch/tokio"]
 async-io = ["dep:async-io", "dep:async-std", "if-watch/smol"]
+# async-io feature is deprecated and will be removed in a future release
 
 [dev-dependencies]
 async-std = { version = "1.9.0", features = ["attributes"] }

protocols/mdns/src/behaviour.rs

@@ -79,7 +79,10 @@ pub trait Abort {
 }
 
 /// The type of a [`Behaviour`] using the `async-io` implementation.
-#[cfg(feature = "async-io")]
+#[cfg(feature = "async-io")]#[deprecated(
+    since = "0.47.0",
+    note = "async-io has been discontinued. Please use the tokio feature instead."
+)]
 pub mod async_io {
     use std::future::Future;
 

protocols/mdns/src/behaviour/socket.rs

@@ -51,6 +51,10 @@ pub trait AsyncSocket: Unpin + Send + 'static {
 }
 
 #[cfg(feature = "async-io")]
+#[deprecated(
+    since = "0.47.0",
+    note = "async-io has been discontinued. Please use the tokio feature instead."
+)]
 pub(crate) mod asio {
     use async_io::Async;
     use futures::FutureExt;

protocols/mdns/src/behaviour/timer.rs

@@ -41,6 +41,10 @@ pub trait Builder: Send + Unpin + 'static {
 }
 
 #[cfg(feature = "async-io")]
+#[deprecated(
+    since = "0.47.0",
+    note = "async-io has been discontinued. Please use the tokio feature instead."
+)]
 pub(crate) mod asio {
     use std::{
         pin::Pin,

protocols/mdns/src/lib.rs

@@ -41,6 +41,10 @@ use std::{
 
 mod behaviour;
 #[cfg(feature = "async-io")]
+#[deprecated(
+    since = "0.47.0",
+    note = "async-io has been discontinued. Please use the tokio feature instead."
+)]
 pub use crate::behaviour::async_io;
 #[cfg(feature = "tokio")]
 pub use crate::behaviour::tokio;