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