You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = 'a Lwt.t
module Or_error : sig ... end
val return : 'a -> 'a t
val after : float -> unit t
val catch : (unit -> 'a t) -> 'a Or_error.t
val async : unit t -> unit
val (>>=) : 'a t -> ('a -> 'b t) -> 'b t
val (>>|) : 'a t -> ('a -> 'b) -> 'b t
val (>>=?) : ('a, 'c) result t -> ('a -> ('b, 'c) result t) -> ('b, 'c) result t