function configuration_hash_user_role in Configuration Management 7
File
- includes/configuration.user.inc, line 421 
Code
function configuration_hash_user_role($identifier) {
  // Export just the field we're tracking.
  module_load_include('inc', 'configuration', 'configuration.export');
  $data = user_role_configuration_export_options();
  // Export the field we just saved and evaluate the export to hash
  $code = user_role_configuration_export_render('configuration', array(
    $identifier,
  ));
  eval(array_pop($code));
  return md5(serialize($roles[$identifier]));
}