# File lib/yard/rubygems/backports/source_index.rb, line 109
  def load_gems_in(*spec_dirs)
    @gems.clear

    spec_dirs.reverse_each do |spec_dir|
      spec_files = Dir.glob File.join(spec_dir, '*.gemspec')

      spec_files.each do |spec_file|
        gemspec = Gem::Specification.load spec_file
        add_spec gemspec if gemspec
      end
    end

    self
  end