@Contract("null -> false")
  private static boolean isStringLiteral(@Nullable PsiLanguageInjectionHost element) {
    if (element instanceof GrStringContent) {
      return true;
    }
    else if (element instanceof GrLiteral) {
      final IElementType type = GrLiteralImpl.getLiteralType((GrLiteral)element);
      return TokenSets.STRING_LITERALS.contains(type);
    }
    return false;
  }
@Contract("null -> false")
  private static boolean isStringLiteral(@Nullable PsiLanguageInjectionHost element)