Do not suggest `#[derive(Copy)]` when we wanted a `!Copy` type. Do not say "`Copy` is not implemented for `T` but `Copy` is". Do not talk about `Trait` having no implementations when `!Trait` was desired.
Do not suggest `#[derive(Copy)]` when we wanted a `!Copy` type. Do not say "`Copy` is not implemented for `T` but `Copy` is". Do not talk about `Trait` having no implementations when `!Trait` was desired.