(* TEST
flags = "-i"
ocamlc_byte_exit_status = "2"
* setup-ocamlc.byte-build-env
** ocamlc.byte
*** check-ocamlc.byte-output
*)

let t =
  (function `A | `B -> () : 'a) (`A : [`A]);
  (failwith "dummy" : 'a) (* to know how 'a is unified *)