val rule : offset:Offset.t -> ('test, 'v) Ty.t -> 'test Test.t -> Parse.message -> operation
val name : offset:Offset.t -> string -> operation
val use : offset:Offset.t -> invert:bool -> string -> operation
val mime : string -> operation
val elt : ?filename:string -> ?line:int -> operation -> elt
val node : (elt * t) list -> t
val leaf : t
