OCaml library : Result

`sig
type ('a, 'e) t = ('a, 'e) Stdlib.result = Ok of 'a | Error of 'e
val ok : 'a -> ('a, 'e) Stdlib.result
val error : 'e -> ('a, 'e) Stdlib.result
val value : ('a, 'e) Stdlib.result -> default:'a -> 'a
val get_ok : ('a, 'e) Stdlib.result -> 'a
val get_error : ('a, 'e) Stdlib.result -> 'e
val bind :
('a, 'e) Stdlib.result ->
('a -> ('b, 'e) Stdlib.result) -> ('b, 'e) Stdlib.result
val join :
(('a, 'e) Stdlib.result, 'e) Stdlib.result -> ('a, 'e) Stdlib.result
val map : ('a -> 'b) -> ('a, 'e) Stdlib.result -> ('b, 'e) Stdlib.result
val map_error :
('e -> 'f) -> ('a, 'e) Stdlib.result -> ('a, 'f) Stdlib.result
val fold :
ok:('a -> 'c) -> error:('e -> 'c) -> ('a, 'e) Stdlib.result -> 'c
val iter : ('a -> unit) -> ('a, 'e) Stdlib.result -> unit
val iter_error : ('e -> unit) -> ('a, 'e) Stdlib.result -> unit
val is_ok : ('a, 'e) Stdlib.result -> bool
val is_error : ('a, 'e) Stdlib.result -> bool
val equal :
ok:('a -> 'a -> bool) ->
error:('e -> 'e -> bool) ->
('a, 'e) Stdlib.result -> ('a, 'e) Stdlib.result -> bool
val compare :
ok:('a -> 'a -> int) ->
error:('e -> 'e -> int) ->
('a, 'e) Stdlib.result -> ('a, 'e) Stdlib.result -> int
val to_option : ('a, 'e) Stdlib.result -> 'a option
val to_list : ('a, 'e) Stdlib.result -> 'a list
val to_seq : ('a, 'e) Stdlib.result -> 'a Stdlib.Seq.t
end`