Show HN: A Lisp interpreter in C# 7

Re:Show HN: A Lisp interpreter in C# 7 by hestefisk on Sunday July 01, 2018 @04:36PM (#17437412)

Neat work! Also good demonstration of new C# 7.0 features.

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Re:Show HN: A Lisp interpreter in C# 7 by suzuki on Monday July 02, 2018 @07:22AM (#17440746)

Thank you. I appreciated especially the pattern matching feature of C# 7 while programming the interpreter. For example:

        /// <summary>Evaluate a Lisp expression in an environment.</summary>
        public object Eval(object x, Cell env) {
            try {
                for (;;) {
                    switch (x) {
                    case Arg xarg:
                        return xarg.GetValue(env);
                    case Sym xsym:
                        try {
                            return Globals[xsym];
                        } catch (KeyNotFoundException) {
                            throw new EvalException("void variable", x);
                        }
                    case Cell xcell:

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