error[E0751]: found both positive and negative implementation of trait `Clone` for type `&mut MyType<'_>`: --> $DIR/pin-unsound-issue-66544-clone.rs:7:1 | LL | impl<'a> Clone for &'a mut MyType<'a> { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ positive implementation here | = note: negative implementation in crate `core` error: aborting due to previous error For more information about this error, try `rustc --explain E0751`.