fails:Kernel#extend requires multiple arguments
fails:Kernel#extend calls extend_object on argument
fails:Kernel#extend does not calls append_features on arguments metaclass
fails:Kernel#extend calls extended on argument
fails:Kernel#extend makes the class a kind_of? the argument
fails:Kernel#extend raises an ArgumentError when no arguments given
fails:Kernel#extend on frozen instance raises an ArgumentError when no arguments given
fails:Kernel#extend on frozen instance raises a RuntimeError
