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, 2 insertions, 2 deletions

diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs
index e1f99595..7e5c60e2 100644
--- a/tokio/tests/sync_mpsc.rs
+++ b/tokio/tests/sync_mpsc.rs
@@ -42,7 +42,7 @@ fn send_recv_with_buffer() {
 
 #[tokio::test]
 async fn send_recv_stream_with_buffer() {
-    use futures::StreamExt;
+    use tokio::stream::StreamExt;
 
     let (mut tx, mut rx) = mpsc::channel::<i32>(16);
 
@@ -147,7 +147,7 @@ async fn async_send_recv_unbounded() {
 
 #[tokio::test]
 async fn send_recv_stream_unbounded() {
-    use futures::StreamExt;
+    use tokio::stream::StreamExt;
 
     let (tx, mut rx) = mpsc::unbounded_channel::<i32>();