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-rw-r--r--src/libcore/pin.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/pin.rs b/src/libcore/pin.rs
index aca6fb20138..676d2c784ac 100644
--- a/src/libcore/pin.rs
+++ b/src/libcore/pin.rs
@@ -672,6 +672,7 @@ impl<'a, T: ?Sized> Pin<&'a T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked<U, F>(self, func: F) -> Pin<&'a U>
     where
+        U: ?Sized,
         F: FnOnce(&T) -> &U,
     {
         let pointer = &*self.pointer;
@@ -763,6 +764,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked_mut<U, F>(self, func: F) -> Pin<&'a mut U>
     where
+        U: ?Sized,
         F: FnOnce(&mut T) -> &mut U,
     {
         let pointer = Pin::get_unchecked_mut(self);