You can search for identifiers within the package.
in-package search v0.2.0
type block = [
| `S of string
| `P of string
| `Pre of string
| `I of string * string
| `Noblank
| `Blocks of block list
]
type env
type info
module Arg : sig ... end
type arg_list = (string list * Arg.spec * info) list
type sub