module Result: Resulttype('a, 'e)t =('a, 'e) result=
| | | Ok of  | 
| | | Error of  | 
The type for result values. Either a value Ok v or an error Error e.
val ok : 'a -> ('a, 'e) resultok v is Ok v.
val error : 'e -> ('a, 'e) resulterror e is Error e.
val value : ('a, 'e) result -> default:'a -> 'avalue r ~default is v if r is Ok v and default otherwise.
val get_ok : ('a, 'e) result -> 'aget_ok r is v if r is Ok v and raise otherwise.
Invalid_argument if r is Error _.val get_ok' : ('a, string) result -> 'aget_ok' is like Result.get_ok but in case of error uses the
    error message for raising Invalid_argument.
val get_error : ('a, 'e) result -> 'eget_error r is e if r is Error e and raise otherwise.
Invalid_argument if r is Ok _.val error_to_failure : ('a, string) result -> 'aerror_to_failure r is v if r is Ok v and raises Failure e
    if r is Error e.
val bind : ('a, 'e) result ->
       ('a -> ('b, 'e) result) -> ('b, 'e) resultbind r f is f v if r is Ok v and r if r is Error _.
val join : (('a, 'e) result, 'e) result -> ('a, 'e) resultjoin rr is r if rr is Ok r and rr if rr is Error _.
val map : ('a -> 'b) -> ('a, 'e) result -> ('b, 'e) resultmap f r is Ok (f v) if r is Ok v and r if r is Error _.
val product : ('a, 'e) result ->
       ('b, 'e) result -> ('a * 'b, 'e) resultproduct r0 r1 is Ok (v0, v1) if r0 is Ok v0 and r1 is Ok v2
    and otherwise returns the error of r0, if any, or the error of r1.
val map_error : ('e -> 'f) -> ('a, 'e) result -> ('a, 'f) resultmap_error f r is Error (f e) if r is Error e and r if
    r is Ok _.
val fold : ok:('a -> 'c) -> error:('e -> 'c) -> ('a, 'e) result -> 'cfold ~ok ~error r is ok v if r is Ok v and error e if r
    is Error e.
val retract : ('a, 'a) result -> 'aretract r is v if r is Ok v or Error v.
val iter : ('a -> unit) -> ('a, 'e) result -> unititer f r is f v if r is Ok v and () otherwise.
val iter_error : ('e -> unit) -> ('a, 'e) result -> unititer_error f r is f e if r is Error e and () otherwise.
val is_ok : ('a, 'e) result -> boolis_ok r is true if and only if r is Ok _.
val is_error : ('a, 'e) result -> boolis_error r is true if and only if r is Error _.
val equal : ok:('a -> 'a -> bool) ->
       error:('e -> 'e -> bool) ->
       ('a, 'e) result -> ('a, 'e) result -> boolequal ~ok ~error r0 r1 tests equality of r0 and r1 using ok
    and error to respectively compare values wrapped by Ok _ and
    Error _.
val compare : ok:('a -> 'a -> int) ->
       error:('e -> 'e -> int) ->
       ('a, 'e) result -> ('a, 'e) result -> intcompare ~ok ~error r0 r1 totally orders r0 and r1 using ok and
    error to respectively compare values wrapped by Ok _  and Error _.
    Ok _ values are smaller than Error _ values.
val to_option : ('a, 'e) result -> 'a optionto_option r is r as an option, mapping Ok v to Some v and
    Error _ to None.
val to_list : ('a, 'e) result -> 'a listto_list r is [v] if r is Ok v and [] otherwise.
val to_seq : ('a, 'e) result -> 'a Seq.tto_seq r is r as a sequence. Ok v is the singleton sequence
    containing v and Error _ is the empty sequence.
module Syntax:sig..end
Binding operators.