/**
 * Implements hook_field_attach_rename_bundle().
 */
function {{ machine_name }}_field_attach_rename_bundle($entity_type, $bundle_old, $bundle_new) {
  // Update the extra weights variable with new information.
  if ($bundle_old !== $bundle_new) {
    $extra_weights = variable_get('field_extra_weights', array());
    if (isset($info[$entity_type][$bundle_old])) {
      $extra_weights[$entity_type][$bundle_new] = $extra_weights[$entity_type][$bundle_old];
      unset($extra_weights[$entity_type][$bundle_old]);
      variable_set('field_extra_weights', $extra_weights);
    }
  }
}