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(* TEST
 flags = " -w -a ";
 setup-ocamlc.byte-build-env;
 ocamlc.byte;
 check-ocamlc.byte-output;
*)

(* PR5057 *)

module TT = struct
  module IntSet = Set.Make(struct type t = int let compare = compare end)
end

let () =
  let f flag =
    let module T = TT in
    let _ = match flag with `A -> 0 | `B r -> r in
    let _ = match flag with `A -> T.IntSet.mem | `B r -> r in
    ()
  in
  f `A