PhpParser\Lexer::errorMayHaveOccurred PHP Method

    private function errorMayHaveOccurred()
    {
        if (defined('HHVM_VERSION')) {
            // In HHVM token_get_all() does not throw warnings, so we need to conservatively
            // assume that an error occurred
            return true;
        }
        $error = error_get_last();
        return null !== $error && false === strpos($error['message'], 'Undefined variable');
    }