error[E0204]: the trait `Copy` cannot be implemented for this type
  --> $DIR/missing-bound-in-manual-copy-impl-2.rs:16:18
   |
LL | struct Wrapper<T>(T);
   |                   - this field does not implement `Copy`
...
LL | impl<S> Copy for Wrapper<OnlyCopyIfDisplay<S>> {}
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: the `Copy` impl for `OnlyCopyIfDisplay<S>` requires that `S: std::fmt::Display`
  --> $DIR/missing-bound-in-manual-copy-impl-2.rs:4:19
   |
LL | struct Wrapper<T>(T);
   |                   ^
help: consider restricting type parameter `S`
   |
LL | impl<S: std::fmt::Display> Copy for Wrapper<OnlyCopyIfDisplay<S>> {}
   |       +++++++++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0204`.