You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: runner.rb
    path of file: ./repos/nanoc/nanoc-checking/lib/nanoc/checking
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Nanoc
  module Checking
    # Runner is reponsible for running issue checks.
    #
    # @api private
    class Runner
      # @param [Nanoc::Core::Site] site The Nanoc site this runner is for
      def ini
    
      def print_issues(issues)
        require 'colored'

        return if issues.empty?

        puts 'Issues found!'
        issues.group_by(&:subject).to_a.sort_by { |s| subject_to_s(s.first) }.each do |pair|
          subject = pair.first
          issues  = pair.last
          next if issues.empty?

          puts "  #{subject_to_s(subject)}:"
          issues.each do |i|
            puts "    [ #{'ERROR'.red} ] #{i.check_class.identifier} - #{i.description}"
          end
        end
      end