You can search for identifiers within the package.
in-package search v0.2.0
type filename = string
val with_in_file : filename -> (Stdlib.in_channel -> 'a) -> 'a0
val with_out_file : filename -> (Stdlib.out_channel -> 'a) -> 'a0
val save : filename -> 'a -> unit
val restore : filename -> 'a