Make sure Unpin is implemented for StackListener

Signed-off-by: John Nunley <dev@notgull.net>

src/lib.rs

@@ -1357,6 +1357,7 @@ pub mod __private {
     pin_project_lite::pin_project! {
         /// Space on the stack where a stack-based listener can be allocated.
         #[doc(hidden)]
+        #[project(!Unpin)]
         pub struct StackSlot<'ev, T> {
             #[pin]
             listener: InnerListener<T, &'ev Inner<T>>
@@ -1370,6 +1371,9 @@ pub mod __private {
         }
     }
 
+    impl<T> core::panic::UnwindSafe for StackSlot<'_, T> {}
+    impl<T> core::panic::RefUnwindSafe for StackSlot<'_, T> {}
+
     impl<'ev, T> StackSlot<'ev, T> {
         /// Create a new `StackSlot` on the stack.
         #[inline]
@@ -1402,6 +1406,10 @@ pub mod __private {
         slot: Pin<&'stack mut StackSlot<'ev, T>>,
     }
 
+    impl<T> core::panic::UnwindSafe for StackListener<'_, '_, T> {}
+    impl<T> core::panic::RefUnwindSafe for StackListener<'_, '_, T> {}
+    impl<T> Unpin for StackListener<'_, '_, T> {}
+
     impl<T> fmt::Debug for StackListener<'_, '_, T> {
         #[inline]
         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {