net: use &self with TcpListener::accept (#2919)

Uses the infrastructure added by #2828 to enable switching
`TcpListener::accept` to use `&self`.

This also switches `poll_accept` to use `&self`. While doing introduces
a hazard, `poll_*` style functions are considered low-level. Most users
will use the `async fn` variants which are more misuse-resistant.

TcpListener::incoming() is temporarily removed as it has the same
problem as `TcpSocket::by_ref()` and will be implemented later.

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/print_each_packet.rs b/examples/print_each_packet.rs
index d650b5bd..b3e1b17e 100644
--- a/examples/print_each_packet.rs
+++ b/examples/print_each_packet.rs
@@ -74,7 +74,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     // above and must be associated with an event loop, so we pass in a handle
     // to our event loop. After the socket's created we inform that we're ready
     // to go and start accepting connections.
-    let mut listener = TcpListener::bind(&addr).await?;
+    let listener = TcpListener::bind(&addr).await?;
     println!("Listening on: {}", addr);
 
     loop {