You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = 'a Lwd.t
val return : 'a -> 'a t
type (-'a, 'b) ft = 'a -> 'b
val fmap : ('a, 'b) ft -> 'a t -> 'b t
type 'a tlist = 'a Lwd.t list
val nil : unit -> 'a tlist
val singleton : 'a t -> 'a tlist
val cons : 'a t -> 'a tlist -> 'a tlist
val append : 'a tlist -> 'a tlist -> 'a tlist
val map : ('a, 'b) ft -> 'a tlist -> 'b tlist