    # File lib/yard/options.rb, line 169
        def method_missing(meth, *args, &block)
          if meth.to_s =~ /^(.+)=$/
            log.debug "Attempting to set unregistered key #{$1} on #{self.class}"
            instance_variable_set("@#{$1}", args.first)
          elsif args.size == 0
            log.debug "Attempting to access unregistered key #{meth} on #{self.class}"
            instance_variable_get("@#{meth}")
          else
            super
          end
        end