error[E0204]: the trait `Copy` cannot be implemented for this type
  --> $DIR/issue-27340.rs:2:10
   |
LL | #[derive(Copy, Clone)]
   |          ^^^^
LL |
LL | struct Bar(Foo);
   |            --- this field does not implement `Copy`
   |
   = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

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