Module Process.Pi

module type MGR = sig ... end
type Eio.Resource.pi +=
  1. | Mgr_unix : ('t, (module MGR with type t = 't), [> mgr_ty ]) Eio.Resource.pi
val mgr_unix : (module MGR with type t = 't and type tag = 'tag) -> ('t, 'tag Eio.Process.mgr_ty) Eio.Resource.handler