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This Let_syntax allows you to write expressions like

let open Incr.Let_syntax in
let%map_open some_incr = watch some_variable
and another_incr = ...
and ...
...expression involving some_incr, another_incr, etc...

Note that this is less efficient than using map3, map4, etc., as the latter produces fewer intermediate nodes. You can also use let%mapn syntax to use n-ary map functions efficiently.

val (>>|) : ('a, 'w) t -> ('a -> 'b) -> ('b, 'w) t
val (>>=) : ('a, 'w) t -> ('a -> ('b, 'w) t) -> ('b, 'w) t
module Let_syntax : sig ... end