error[E0277]: the trait bound `T: Copy` is not satisfied --> $DIR/issue-27675-unchecked-bounds.rs:15:31 | LL | fn copy(from: &U::From) -> U::From { | ----- required by this bound in `copy` ... LL | copy::>(t) | ^ the trait `Copy` is not implemented for `T` | help: consider restricting type parameter `T` | LL | pub fn copy_any(t: &T) -> T { | ^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.