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type ('a, 's) io
type 's scheduler = {
bind: 'a 'b. ('a, 's) io -> ('a -> ('b, 's) io) -> ('b, 's) io
; return: 'a. 'a -> ('a, 's) io
}
type ('f, 's, 'e) seek = {
lseek: 'f -> int -> [ `SET | `CUR | `END ] -> ((int, 'e) result, 's) io
}
module type X = sig
type 'a s
type t
external inj : 'a s -> ('a, t) io = "%identity"
external prj : ('a, t) io -> 'a s = "%identity"
end
module Common = struct
type t
external inj : 'a -> 'b = "%identity"
external prj : 'a -> 'b = "%identity"
end
module type FUNCTOR = sig
type 'a t
end
module Make (T : FUNCTOR) = struct
type 'a s = 'a T.t
include Common
end
type ('f, 'b, 's, 'e) input =
'f -> 'b -> off:int -> len:int -> ((int, 'e) result, 's) io
type ('f, 'b, 's, 'e) output =
'f -> 'b -> off:int -> len:int -> ((int, 'e) result, 's) io