val (let+) : ('a, 'b) Stdlib.result -> ('a -> 'c) -> ('c, 'b) Stdlib.result
val (let*) :
('a, 'b) Stdlib.result ->
('a -> ('c, 'b) Stdlib.result) ->
('c, 'b) Stdlib.result
val (let-) :
('a, 'b) Stdlib.result ->
('b -> ('a, 'c) Stdlib.result) ->
('a, 'c) Stdlib.result