You can search for identifiers within the package.
in-package search v0.2.0
type ('a, 'b) t = 'a * 'b
type 'a s = ('a, 'a) t
val assemble : 'a -> 'b -> ('a, 'b) t
val fst : ('a, 'b) t -> 'a
val snd : ('a, 'b) t -> 'b
val get : 'a s -> int -> 'a