add must_use attributes on Future and Stream

rust-lang · Sep 5, 2019 · ad7830d · ad7830d
1 parent 632838c
commit ad7830d
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diff --git a/src/future/mod.rs b/src/future/mod.rs
@@ -174,6 +174,7 @@ use {Poll, stream};
 /// More information about combinators can be found [on tokio.rs].
 ///
 /// [on tokio.rs]: https://tokio.rs/docs/going-deeper-futures/futures-mechanics/
+#[must_use = "futures do nothing unless polled"]
 pub trait Future {
     /// The type of value that this future will resolved with if it is
     /// successful.

diff --git a/src/stream/mod.rs b/src/stream/mod.rs
@@ -180,6 +180,7 @@ if_std! {
 /// please feel welcome to comment on [the issue][being considered]!
 ///
 /// [being considered]: https://github.com/rust-lang-nursery/futures-rs/issues/206
+#[must_use = "streams do nothing unless polled"]
 pub trait Stream {
     /// The type of item this stream will yield on success.
     type Item;