Update to 2021 edition

Cargo.toml

@@ -2,7 +2,7 @@
 name = "zeromq"
 version = "0.3.3"
 authors = ["Alexei Kornienko <[email protected]>"]
-edition = "2018"
+edition = "2021"
 description = "A native Rust implementation of ZeroMQ"
 license = "MIT"
 repository = "https://github.com/zeromq/zmq.rs"

benches/req_rep.rs

@@ -41,7 +41,7 @@ fn criterion_benchmark(c: &mut Criterion) {
     bench(&mut group, "IPC", "ipc://req_rep.sock", &mut rt);
 
     fn bench(group: &mut BenchGroup, bench_name: &str, endpoint: &str, rt: &mut Runtime) {
-        #[allow(unused)]
+        #[allow(unused, clippy::redundant_locals)]
         let rt = rt;
 
         #[cfg(feature = "tokio-runtime")]

src/fair_queue.rs

@@ -55,7 +55,7 @@ impl<K: Clone> Eq for ReadyEvent<K> {}
 
 impl<K: Clone> PartialOrd for ReadyEvent<K> {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        other.priority.partial_cmp(&self.priority)
+        Some(self.cmp(other))
     }
 }
 impl<K: Clone> Ord for ReadyEvent<K> {

src/lib.rs

@@ -227,7 +227,7 @@ pub trait Socket: Sized + Send {
     /// Returns the endpoint resolved to the exact bound location if applicable
     /// (port # resolved, for example).
     async fn bind(&mut self, endpoint: &str) -> ZmqResult<Endpoint> {
-        let endpoint = endpoint.try_into()?;
+        let endpoint = TryIntoEndpoint::try_into(endpoint)?;
 
         let cloned_backend = self.backend();
         let cback = move |result| {
@@ -300,7 +300,7 @@ pub trait Socket: Sized + Send {
     /// Connects to the given endpoint.
     async fn connect(&mut self, endpoint: &str) -> ZmqResult<()> {
         let backend = self.backend();
-        let endpoint = endpoint.try_into()?;
+        let endpoint = TryIntoEndpoint::try_into(endpoint)?;
 
         let result = match util::connect_forever(endpoint).await {
             Ok((socket, endpoint)) => match util::peer_connected(socket, backend).await {