As for the EmptyList stuff there was no real fundamental decision behind it, just ease of use of Pairs in our code. I also feel like it’s the way to do when representing nil in language such as Scheme but it’s only my taste !

@DS Blank: good catch on the pair?/list? I will correct that. I will be sure to see your code too .

> (pair? ‘())
#f
> (list? ‘())
#t

So this is a special case.

We are also working on Scheme interpreter in C#, but we have written it in Scheme, and it gets automatically transformed into C# through first-principles.

It is brand new, and has a long way to go, but feel free to try it and comment, and send patches! See http://wiki.roboteducation.org/PyjamaScheme

We have exceptions, proper tail-call recursion, try/except, and big plans…

I have a few questions:

1) Why are there empty directories? Is this for files that still have to be implemented?

2) In the definition of Pair I see this:

public static readonly Pair EmptyList = new Pair(null, null);

Why did you choose this representation instead of just null?

3) Do you support macros?

4) Do you support something like defstruct?

* The Italian version is that it was invented by Medici’s Tuscan cooks who brought it to France from Italy in the seventeenth century, Sauce Béchamel was a slow simmering of milk, veal stock and seasonings, strained, with an enrichment of cream.

* It was created by Philippe de Mornay, who also is reputed to have invented Mornay sauce, Lyonnaise sauce, and Porto sauce.

* It was invented by Marquis Louis de Béchamel (1630–1703), a seventeenth century financier who held the honorary post of chief steward to Louis XIV (1643-1715).

* It was created by François Pierre de la Varenne (1615-1678) who was chef to the court of Louis XIV (1643-1715) , during the time that Louis de Béchamel was there. It is believed that La Varenne named the sauce in his honour.

source: http://en.wikipedia.org/wiki/Bechamel