hyphenator= (Text::Format)

         # File lib/text/format.rb, line 318
    318:     def hyphenator=(h)
    319:       raise ArgumentError, "#{h.inspect} is not a valid hyphenator." unless h.respond_to?(:hyphenate_to)
    320:       arity = h.method(:hyphenate_to).arity
    321:       raise ArgumentError, "#{h.inspect} must have exactly two or three arguments." unless [2, 3].include?(arity)
    322:       @hyphenator = h
    323:       @hyphenator_arity = arity
    324:     end