private Signal ScanLiteralSignal()
        {
            LexerToken token = tokenizer.MatchGet(TokenTypes.Literal);
            Signal     s     = LiteralValue.Constant(token.Text);

            system.AddSignal(s);
            return(s);
        }
        public Guid BuildSignal(string label, bool hold, bool isSource)
        {
            Signal s = Binder.CreateSignal();

            _system.AddSignal(s);
            _signalMappings.Add(s.InstanceId, s);
            return(s.InstanceId);
        }