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These are convenient to have in scope when programming with a monad:

val return : 'a -> 'a Lwt.t
val (>>=) : 'a Lwt.t -> ('a -> 'b Lwt.t) -> 'b Lwt.t

t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does t to yield a value v, and then runs the computation returned by f v.

val (>>|) : 'a Lwt.t -> ('a -> 'b) -> 'b Lwt.t

t >>| f is t >>= (fun a -> return (f a)).

module Let_syntax : sig ... end