error[E0277]: the trait bound `B: Clone` is not satisfied --> $DIR/issue-79224.rs:18:29 | LL | impl Display for Cow<'_, B> { | ^^^^^^^^^^ the trait `Clone` is not implemented for `B` | = note: required for `B` to implement `ToOwned` help: consider further restricting this bound | LL | impl Display for Cow<'_, B> { | +++++++++++++++++++ error[E0277]: the trait bound `B: Clone` is not satisfied --> $DIR/issue-79224.rs:20:12 | LL | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ^^^^^ the trait `Clone` is not implemented for `B` | = note: required for `B` to implement `ToOwned` help: consider further restricting this bound | LL | impl Display for Cow<'_, B> { | +++++++++++++++++++ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.