MyApp.Cldr.unknown_locale_names

You're seeing just the function unknown_locale_names, go back to MyApp.Cldr module for more information.

Specs

unknown_locale_names() :: [Cldr.Locale.locale_name()]

Returns a list of the locales names that are configured, but not known in CLDR.

Since there is a compile-time exception raised if there are any unknown locales this function should always return an empty list.