Convenience.1-X
type ('i, 'o) t
type error
val eval : 'a -> 'a -> ('a, 'a) t -> [ `Await of ('a, 'a) t | `Flush of ('a, 'a) t | `End of ('a, 'a) t | `Error of ('a, 'a) t * error ]
val refill : int -> int -> ('i, 'o) t -> ('i, 'o) t
val flush : int -> int -> ('i, 'o) t -> ('i, 'o) t
val used_out : ('i, 'o) t -> int