Ppxlib.Context_freeContext free rewriting, to define local rewriting rules that will all be applied at once by the driver.
module Rule : sig ... endLocal rewriting rules.
class map_top_down : ?expect_mismatch_handler:Expect_mismatch_handler.t -> ?generated_code_hook:
  Generated_code_hook.t -> ?embed_errors:bool -> Rule.t list -> object ... end