Support for the Ruby 2.4 series has ended. See here for reference.
# File rubygems/commands/stale_command.rb, line 23 def execute gem_to_atime = {} Gem::Specification.each do |spec| name = spec.full_name Dir["#{spec.full_gem_path}/**/*.*"].each do |file| next if File.directory?(file) stat = File.stat(file) gem_to_atime[name] ||= stat.atime gem_to_atime[name] = stat.atime if gem_to_atime[name] < stat.atime end end gem_to_atime.sort_by { |_, atime| atime }.each do |name, atime| say "#{name} at #{atime.strftime '%c'}" end end