This module is used to implement Context_free.V1.map_top_down
val convert : 'a t Ppxlib__.Import.list ‑> loc:Location.t ‑> path:Ppxlib__.Import.string ‑> Ppxlib__.Import.extension ‑> 'a Ppxlib__.Import.option
val convert_inline : 'a t Ppxlib__.Import.list ‑> loc:Location.t ‑> path:Ppxlib__.Import.string ‑> Ppxlib__.Import.extension ‑> 'a Ppxlib__.Import.list Ppxlib__.Import.option