Delayed_result.Syntax
val (let**) : ('a, 'b) t -> ('a -> ('c, 'b) t) -> ('c, 'b) t
val (let++) : ('a, 'b) t -> ('a -> 'c) -> ('c, 'b) t
val (let+*) : ('a, 'b) t -> ('a -> ('c, 'b) Result.t) -> ('c, 'b) t