# File lib/main/parameter.rb, line 167
    def check_arity 
      return true if not given? and optional?

      ex = values.size == 0 ? NotGiven : Arity

      (raise ex, "#{ typename })" if values.size.zero? and argument_required?) unless arity == -1

      if arity >= 0
        min = arity
        sign = ''
      else
        min = arity.abs - 1
        sign = '-'
      end

      arity = min

??
      if values.size < arity
        if argument_optional?
          raise ex, "#{ typename }) #{ values.size }/#{ sign }#{ arity }" if(values.size < arity and values.size > 0)
        elsif argument_required? or argument_none?
          raise ex, "#{ typename }) #{ values.size }/#{ sign }#{ arity }" if(values.size < arity)
        end
      end
    end