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, 2 insertions, 2 deletions

diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs
index a6a739be..22109f7d 100644
--- a/tokio/src/runtime/mod.rs
+++ b/tokio/src/runtime/mod.rs
@@ -25,7 +25,7 @@
 //!
 //! #[tokio::main]
 //! async fn main() -> Result<(), Box<dyn std::error::Error>> {
-//!     let mut listener = TcpListener::bind("127.0.0.1:8080").await?;
+//!     let listener = TcpListener::bind("127.0.0.1:8080").await?;
 //!
 //!     loop {
 //!         let (mut socket, _) = listener.accept().await?;
@@ -73,7 +73,7 @@
 //!
 //!     // Spawn the root task
 //!     rt.block_on(async {
-//!         let mut listener = TcpListener::bind("127.0.0.1:8080").await?;
+//!         let listener = TcpListener::bind("127.0.0.1:8080").await?;
 //!
 //!         loop {
 //!             let (mut socket, _) = listener.accept().await?;