Fix compiling net::udp::UdpSocket doctest with Rust 1.71

0001-Fix-compiling-net-udp-UdpSocket-doctest-with-Rust-1..patch

@@ -0,0 +1,31 @@
+From a09c71a8c1a4fcf992606dedc65cd2a50e90fdee Mon Sep 17 00:00:00 2001
+From: Fabio Valentini <decathorpe@gmail.com>
+Date: Sun, 23 Jul 2023 22:56:50 +0200
+Subject: [PATCH] Fix compiling net::udp::UdpSocket doctest with Rust 1.71
+
+With Rust 1.71 this doctest fails to compile because of a new
+`dropping_copy_types` warning, which is elevated to a hard
+error because of "deny(warnings)".
+
+This PR changes the doctest from calling "drop(buffer)"
+to using the "assign to underscore to drop" trick.
+---
+ src/net/udp.rs | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/net/udp.rs b/src/net/udp.rs
+index c5c3ba9..a750da1 100644
+--- a/src/net/udp.rs
++++ b/src/net/udp.rs
+@@ -79,7 +79,7 @@ use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket}
+ ///                 let num_recv = echoer_socket.recv(&mut buffer)?;
+ ///                 println!("echo {:?} -> {:?}", buffer, num_recv);
+ ///                 buffer = [0; 9];
+-///                 # drop(buffer); // Silence unused assignment warning.
++///                 # let _ = buffer; // Silence unused assignment warning.
+ ///                 # return Ok(());
+ ///             }
+ ///             _ => unreachable!()
+-- 
+2.41.0
+

rust-mio0.7.spec

@@ -14,6 +14,8 @@ URL:            https://crates.io/crates/mio
 Source:         %{crates_source}
 # Automatically generated patch to strip foreign dependencies
 Patch:          mio-fix-metadata-auto.diff
+# https://github.com/tokio-rs/mio/pull/1693
+Patch:          0001-Fix-compiling-net-udp-UdpSocket-doctest-with-Rust-1..patch
 
 BuildRequires:  rust-packaging >= 21