Support for the Ruby 2.4 series has ended. See here for reference.
# File rss/maker/feed.rb, line 148 def to_feed(feed) logo = feed.class::Logo.new class << logo alias_method(:url=, :content=) end set = setup_values(logo) class << logo remove_method(:url=) end if set feed.logo = logo set_parent(logo, feed) setup_other_elements(feed, logo) elsif variable_is_set? raise NotSetError.new("maker.image", not_set_required_variables) end end