# File lib/mime/types.rb, line 190
190:     def docs=(d)
191:       if d
192:         a = d.scan(%r{use-instead:#{MEDIA_TYPE_RE}})
193: 
194:         if a.empty?
195:           @use_instead = nil
196:         else
197:           @use_instead = a.map { |el| "#{el[0]}/#{el[1]}" }
198:         end
199:       end
200:     end