# File lib/nanoc/extra/checking/checker_cli.rb, line 89
    def checker_classes_named(n)
      classes = n.map do |a|
        klass = Nanoc::Extra::Checking::Checker.named(a)
        raise Nanoc::Errors::GenericTrivial, "Unknown checker: #{a}" if klass.nil?
        klass
      end
    end