diff options
| -rw-r--r-- | library/core/src/pin.rs | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/library/core/src/pin.rs b/library/core/src/pin.rs index 6b319b4355c..94c682b615a 100644 --- a/library/core/src/pin.rs +++ b/library/core/src/pin.rs @@ -572,7 +572,10 @@ impl<P: Deref> Pin<P> { /// // though we have previously pinned it! We have violated the pinning API contract. /// } /// ``` - /// A value, once pinned, must remain pinned forever (unless its type implements `Unpin`). + /// A value, once pinned, must remain pinned until it is dropped (unless its type implements + /// `Unpin`). Because `Pin<&mut T>` does not own the value, dropping the `Pin` will not drop + /// the value and will not end the pinning contract. So moving the value after dropping the + /// `Pin<&mut T>` is still a violation of the API contract. /// /// Similarly, calling `Pin::new_unchecked` on an `Rc<T>` is unsafe because there could be /// aliases to the same data that are not subject to the pinning restrictions: |