type t = Compcert.Memtype.permission =
| Freeable
| Writable
| Readable
| Nonempty
val to_yojson : t -> Yojson.Safe.t
val of_yojson : Yojson.Safe.t -> t Ppx_deriving_yojson_runtime.error_or
val _ : Yojson.Safe.t -> t Ppx_deriving_yojson_runtime.error_or
val opt_to_int : t option -> int
val pp : Stdlib.Format.formatter -> t -> unit
module Infix : sig ... end