Don't use DNS in server::Builder::listen

DNS doesn't make sense when specifying a local address.

quinn-h3/benches/bench.rs

@@ -116,7 +116,7 @@ impl Context {
             PORTS.lock().unwrap().next().unwrap(),
         );
         let mut server = self.server_config.clone();
-        server.listen(addr).unwrap();
+        server.listen(addr);
         debug!("server bind");
         let handle = thread::spawn(move || {
             let my_span = span!(Level::TRACE, "server");

quinn-h3/src/server.rs

@@ -1,7 +1,7 @@
 use std::{
     future::Future,
-    io, mem,
-    net::{SocketAddr, ToSocketAddrs},
+    mem,
+    net::SocketAddr,
     pin::Pin,
     task::{Context, Poll},
 };
@@ -58,14 +58,9 @@ impl Builder {
         }
     }
 
-    pub fn listen<S: ToSocketAddrs>(&mut self, socket: S) -> Result<&mut Self, io::Error> {
-        self.listen = Some(
-            socket
-                .to_socket_addrs()?
-                .next()
-                .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "no socket found"))?,
-        );
-        Ok(self)
+    pub fn listen(&mut self, addr: SocketAddr) -> &mut Self {
+        self.listen = Some(addr);
+        self
     }
 
     pub fn certificate(

quinn-h3/src/tests/helpers.rs

@@ -52,9 +52,7 @@ impl Helper {
         let Certs { chain, key, cert } = CERTS.clone();
         let mut server = server::Builder::default();
         server.certificate(chain, key).expect("server certs");
-        server
-            .listen(SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), port))
-            .unwrap();
+        server.listen(SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), port));
 
         let mut client = client::Builder::default();
         client.add_certificate_authority(cert.clone()).unwrap();