How to derive show for pairs, lists, etc.?

Learning
1

Hi, I’m using ppx_deriving to derive a show_foo for my type:
type foo = A of int | B of string [@@deriving show]

Now I would like to have a show function for lists of foos, pairs of foos, etc.
Is this possible, similar to how we can derive a Show (a, b) instance from Show a, Show b in Haskell?
Perhaps this is simple but I couldn’t find any information on this. Thanks!

2

According to GitHub - ocaml-ppx/ppx_deriving: Type-driven code generation for OCaml

It’s also possible for many plugins to derive a function directly from a type, without declaring it first.

open OUnit2
let test_list_sort ctxt =
  let sort = List.sort [%derive.ord: int * int] in
  assert_equal ~printer:[%derive.show: (int * int) list]
               [(1,1);(2,0);(3,5)] (sort [(2,0);(3,5);(1,1)])