You can search for identifiers within the package.
in-package search v0.2.0
exception At of (int * int) * exn
val ($) : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b
val identity : 'a -> 'a
val flip : ('a -> 'b -> 'c) -> 'b -> 'a -> 'c
val tuck : 'a list ref -> 'a -> unit
val option_list : 'a option -> 'a list
val fail : ('a, unit, string, 'b) format4 -> 'a
val failed : at:(int * int) -> ('a, unit, string, 'b) format4 -> 'a
val printfn : ('a, unit, string, unit) format4 -> 'a
val eprintfn : ('a, unit, string, unit) format4 -> 'a