+external load : t -> unit
+ = "ocaml_augeas_load"
+external mv : t -> path -> path -> unit
+ = "ocaml_augeas_mv"
+external set : t -> path -> value option -> unit
+ = "ocaml_augeas_set"
+external setm : t -> path -> string option -> value option -> int
+ = "ocaml_augeas_setm"
+external transform : t -> string -> string -> transform_mode -> unit
+ = "ocaml_augeas_transform"
+external source : t -> path -> path option
+ = "ocaml_augeas_source"