public static function create($comment) {
    $comment = trim($comment);
    $lines = array_map('trim', explode("\n", $comment));
    $text = "/**\n";
    foreach ($lines as $i => $line) {
      $text .= ' * ' . $line . "\n";
    }
    $text .= ' */';
    return new DocCommentNode(T_DOC_COMMENT, $text);
  }