sig
  type t =
      [ `Compactions
      | `Cycles
      | `Major_allocated
      | `Major_collections
      | `Minor_allocated
      | `Minor_collections
      | `Nanos
      | `One
      | `Promoted
      | `Runs ]
  val t_of_sexp : Sexplib.Sexp.t -> Bench.Variable.t
  val __t_of_sexp__ : Sexplib.Sexp.t -> Bench.Variable.t
  val sexp_of_t : Bench.Variable.t -> Sexplib.Sexp.t
end