add a few blanket future impls to std

2 files changed, 23 insertions, 0 deletions

diff --git a/src/libcore/future.rs b/src/libcore/future.rs
index b4d087f8edb..a8c8f69411e 100644
--- a/src/libcore/future.rs
+++ b/src/libcore/future.rs
@@ -15,6 +15,7 @@
 //! Asynchronous values.
 
 use mem::PinMut;
+use marker::Unpin;
 use task::{self, Poll};
 
 /// A future represents an asychronous computation.
@@ -91,3 +92,19 @@ pub trait Future {
     /// about the behavior of `poll` after a future has completed.
     fn poll(self: PinMut<Self>, cx: &mut task::Context) -> Poll<Self::Output>;
 }
+
+impl<'a, F: ?Sized + Future + Unpin> Future for &'a mut F {
+    type Output = F::Output;
+
+    fn poll(mut self: PinMut<Self>, cx: &mut task::Context) -> Poll<Self::Output> {
+        F::poll(PinMut::new(&mut **self), cx)
+    }
+}
+
+impl<'a, F: ?Sized + Future> Future for PinMut<'a, F> {
+    type Output = F::Output;
+
+    fn poll(mut self: PinMut<Self>, cx: &mut task::Context) -> Poll<Self::Output> {
+        F::poll((*self).reborrow(), cx)
+    }
+}
diff --git a/src/libcore/task.rs b/src/libcore/task.rs
index e46a6d41d7a..ab1c1da5790 100644
--- a/src/libcore/task.rs
+++ b/src/libcore/task.rs
@@ -32,6 +32,12 @@ pub enum Poll<T> {
     Pending,
 }
 
+impl<T> From<T> for Poll<T> {
+    fn from(t: T) -> Poll<T> {
+        Poll::Ready(t)
+    }
+}
+
 /// A `Waker` is a handle for waking up a task by notifying its executor that it
 /// is ready to be run.
 ///