Antlr4.Runtime.FailedPredicateException.FormatMessage C# (CSharp) 메소드

        private static string FormatMessage(string predicate, string message)
        {
            if (message != null)
            {
                return message;
            }
            return string.Format(CultureInfo.CurrentCulture, "failed predicate: {{{0}}}?", predicate);
        }