1 error[E0277]: the trait bound `U: std::marker::Copy` is not satisfied
2 --> $DIR/wf-in-fn-where-clause.rs:9:4
4 LL | trait MustBeCopy<T:Copy> {
5 | ------------------------ required by `MustBeCopy`
8 | ^^^ the trait `std::marker::Copy` is not implemented for `U`
9 LL | where T: MustBeCopy<U>
10 | - help: consider further restricting type parameter `U`: `, U: std::marker::Copy`
12 error: aborting due to previous error
14 For more information about this error, try `rustc --explain E0277`.