Antlr.Runtime.NoViableAltException.ToString C# (CSharp) Метод

        public override string ToString()
        {
            if ( Input is ICharStream )
            {
                return "NoViableAltException('" + (char)UnexpectedType + "'@[" + GrammarDecisionDescription + "])";
            }
            else
            {
                return "NoViableAltException(" + UnexpectedType + "@[" + GrammarDecisionDescription + "])";
            }
        }