in lib/rubocop/config_patch.rb [3:11]
def reject_obsolete_cops
RuboCop::Config::OBSOLETE_COPS.each do |cop_name, message|
next unless key?(cop_name) || key?(cop_name.split('/').last)
message += "\n(obsolete configuration found in #{loaded_path}, please" \
' update it)'
$stderr.puts message
end
end