# File lib/rubygems/source_index.rb, line 124
    def load_gems_in(*spec_dirs)
      @gems.clear
      specs = Dir.glob File.join("{#{spec_dirs.join(',')}}", "*.gemspec")
      specs.each do |file_name|
        gemspec = self.class.load_specification(file_name.untaint)
        add_spec(gemspec) if gemspec
      end
      self
    end