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/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs
index 280e90ea..d7aca572 100644
--- a/tokio/src/task/spawn.rs
+++ b/tokio/src/task/spawn.rs
@@ -37,7 +37,7 @@ doc_rt_core! {
     ///
     /// #[tokio::main]
     /// async fn main() -> io::Result<()> {
-    ///     let mut listener = TcpListener::bind("127.0.0.1:8080").await?;
+    ///     let listener = TcpListener::bind("127.0.0.1:8080").await?;
     ///
     ///     loop {
     ///         let (socket, _) = listener.accept().await?;