You can search for identifiers within the package.
in-package search v0.2.0
type json = [
| `Null
| `Bool of bool
| `Float of float
| `String of string
| `List of json list
| `Assoc of (string * json) list
]
module type IO = sig ... end
module type Json_encoder_decoder = sig ... end
module Make (IO : IO) : Json_encoder_decoder with module IO := IO