Support for the Ruby 2.4 series has ended. See here for reference.
ItemBase
# File rss/maker/0.9.rb, line 259 def to_feed(rss) item = Rss::Channel::Item.new setup_values(item) _not_set_required_variables = not_set_required_variables if _not_set_required_variables.empty? rss.items << item set_parent(item, rss.channel) setup_other_elements(rss, item) elsif variable_is_set? raise NotSetError.new("maker.items", _not_set_required_variables) end end