code: function validateFragmentProps(fragment) {
    currentlyValidatingElement = fragment;
  
    var keys = Object.keys(fragment.props);
    for (var i = 0; i < keys.length; i++) {
      var key = keys[i];
      if (!VALID_FRAGMENT_PROPS.has(key)) {
        warning(false, 'Invalid prop `%s` supplied to `React.Fragment`. ' + 'React.Fragment can only have `key` and `children` props.%s', key, getStackAddendum());
        break;
      }
    }
  
    if (fragment.ref !== null) {
      warning(false, 'Invalid attribute `ref` supplied to `React.Fragment`.%s', getStackAddendum());
    }
  
    currentlyValidatingElement = null;
  }
docs: Given a fragment, validate that it can only be provided with fragment props
  @param {ReactElement} fragment