Add more Unpin bounds to FuturesUnordered::iter_mut

Author: MajorBreakfast

futures-util/src/stream/futures_unordered/iter_mut.rs

@@ -4,7 +4,7 @@ use super::node::Node;
 
 #[derive(Debug)]
 /// Mutable iterator over all futures in the unordered set.
-pub struct IterMut<'a, F: 'a> {
+pub struct IterMut<'a, F: 'a + Unpin> {
     pub(super) node: *const Node<F>,
     pub(super) len: usize,
     pub(super) _marker: PhantomData<&'a mut FuturesUnordered<F>>

futures-util/src/stream/futures_unordered/mod.rs

@@ -149,7 +149,7 @@ impl<T> FuturesUnordered<T> {
     }
 
     /// Returns an iterator that allows modifying each future in the set.
-    pub fn iter_mut(&mut self) -> IterMut<T> {
+    pub fn iter_mut(&mut self) -> IterMut<T> where T: Unpin {
         IterMut {
             node: self.head_all,
             len: self.len,