# File lib/mongo/auth.rb, line 109
      def initialize(user, used_mechanism = nil)
        specified_mechanism = if user.mechanism
          " (mechanism: #{user.mechanism})"
        else
          ''
        end
        used_mechanism = if used_mechanism
          " (used mechanism: #{used_mechanism})"
        else
          ''
        end
        msg = "User #{user.name}#{specified_mechanism} is not authorized to access #{user.database}#{used_mechanism}"
        super(msg)
      end