diff options
Diffstat (limited to 'src/libstd')
| -rw-r--r-- | src/libstd/future.rs | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libstd/future.rs b/src/libstd/future.rs index 22900c3067b..d1203be3cf0 100644 --- a/src/libstd/future.rs +++ b/src/libstd/future.rs @@ -33,7 +33,9 @@ impl<T: Generator<Yield = ()>> !Unpin for GenFuture<T> {} impl<T: Generator<Yield = ()>> Future for GenFuture<T> { type Output = T::Return; fn poll(self: Pin<&mut Self>, lw: &LocalWaker) -> Poll<Self::Output> { - set_task_waker(lw, || match unsafe { Pin::get_unchecked_mut(self).0.resume() } { + // Safe because we're !Unpin + !Drop mapping to a ?Unpin value + let gen = unsafe { Pin::map_unchecked_mut(self, |s| &mut s.0) }; + set_task_waker(lw, || match gen.resume() { GeneratorState::Yielded(()) => Poll::Pending, GeneratorState::Complete(x) => Poll::Ready(x), }) |