Don't use prelude in the example
@@ -746,8 +746,8 @@ pub trait StreamExt: Stream {
/// ```
/// #![feature(async_await, await_macro)]
/// # futures::executor::block_on(async {
- /// use futures::prelude::*;
/// use futures::channel::oneshot;
+ /// use futures::stream::{self, StreamExt};
///
/// let (send_one, recv_one) = oneshot::channel();
/// let (send_two, recv_two) = oneshot::channel();
