sig
type t = string
type desc = Nolabel | Labelled of string | Optional of string
val explode : Ast_convenience_402.Label.t -> Ast_convenience_402.Label.desc
val nolabel : Ast_convenience_402.Label.t
val labelled : string -> Ast_convenience_402.Label.t
val optional : string -> Ast_convenience_402.Label.t
end