error: `derive` may only be applied to structs, enums and unions
  --> $DIR/issue-36617.rs:1:1
   |
LL | #![derive(Copy)]
   | ^^^^^^^^^^^^^^^^ help: try an outer attribute: `#[derive(Copy)]`

error: cannot determine resolution for the derive macro `Copy`
  --> $DIR/issue-36617.rs:1:11
   |
LL | #![derive(Copy)]
   |           ^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: aborting due to 2 previous errors