Function classify_visibility 

pub fn classify_visibility(
    module: &ModuleName,
    hidden: bool,
    test_only: bool,
    public_modules: &[ModuleName],
    internal_modules: &[ModuleName],
) -> Visibility

Resolves a module’s Visibility from its name, the config’s public and internal module lists, an out-of-band hidden hint (Erlang %% @hidden or -doc(hidden), Elixir @moduledoc false), and whether its only exports are -ifdef(TEST)-guarded. An explicit internal listing wins; a public listing overrides the hidden hint.