stream: add `next` and `map` utility fn (#1962)

Introduces `StreamExt` trait. This trait will be used to add utility functions
to make working with streams easier. This patch includes two functions:

* `next`: a future returning the item in the stream.
* `map`: transform each item in the stream.

1 files changed, 1 insertions, 3 deletions

diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs
index 2cddf24b..3e0e0f7d 100644
--- a/tokio/src/net/tcp/listener.rs
+++ b/tokio/src/net/tcp/listener.rs
@@ -250,9 +250,7 @@ impl TcpListener {
     /// # Examples
     ///
     /// ```no_run
-    /// use tokio::net::TcpListener;
-    ///
-    /// use futures::StreamExt;
+    /// use tokio::{net::TcpListener, stream::StreamExt};
     ///
     /// #[tokio::main]
     /// async fn main() {