Phpstan tool found some deprecation issues, that are not ok for php8.1. All of the same kind: "the return type of method is not covariant with tentative return type of parent method". Php8.1 requires declaration of return type otherwise you will get the deprecation notice.
Problems are located in these files:
- modules/contrib/language_hierarchy/includes/LocaleContextHierarchy.class.inc
- modules/contrib/language_hierarchy/includes/LocaleHierarchy.class.inc
Use the #[\ReturnTypeWillChange] attribute to temporarily suppress the error.
I think this is just what has already been reported at 📌 PHP 8.1 compatibility - phpstan notices Needs review , where there is already a potential fix? Feel free to help out there! Please do check that issues don't already exist for something you wish to report. Thanks!