You can search for identifiers within the package.
in-package search v0.2.0
val validate_list : ([> `Index of int ] as 'a list -> 'b -> 'c option) -> 'a list -> 'b list -> 'c option
val validate_array : ([> `Index of int ] as 'a list -> 'b -> 'c option) -> 'a list -> 'd array -> 'c option
val validate_option : ('a -> 'b -> 'c option) -> 'd -> 'e option -> 'c option