Cannot derive `eq` and `show`

I currently have the following data type:

```ocaml
open Stdint

type fixed_int =
  | U8 of Uint8.t
  | U16 of Uint16.t
  | U32 of Uint32.t
  | U64 of Uint64.t
[@@deriving eq, show]
```

`@@deriving` panics because there is no `equal` and `show` methods for those integer types. I expect the above code to just compile.