[racket] happy april fools day: arctangent 0.1

From: Danny Yoo (dyoo at cs.wpi.edu)
Date: Mon Apr 2 09:12:12 EDT 2012

> BTW, Arc does seem like a pretty good example to use in a tutorial, since
> you can mostly use the normal Racket reader, yet the language looks
> different enough, and the implementation is nontrivial.  Chapter 2 of the
> tutorial uses the example of translating Python? :)

We've got the lexer:


and a parser:


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