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Dybvig Danfest 2004

"The macro writers bill of rights"[1].

Check out KFFD hygienic expansion algo[4].  This lead me to hygienic
macros on top of unhygienic ones[2].

Apparently my letrec is wrong: all evaluations need to happen before
all assignments.

Optimizations: constant folding, copy propagation, inlining, dead code
elimnation.  Inlining (deciding to inline) isn't as easy as copy
propagation: you want your compiler to terminate and prevent code
explosion.

[1] http://video.google.com/videoplay?docid=-6899972066795135270
[2] http://p-cos.net/documents/hygiene.pdf
[3] http://people.csail.mit.edu/jaffer/r4rs_12.html
[4] http://www.cs.ucdavis.edu/~devanbu/teaching/260/kohlbecker.pdf


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