[racket] stumped by a little macro exercise

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Sat Oct 9 15:47:46 EDT 2010

After two steps, do you not get something that looks like this?

[image: mtc.png]

The two mtc's are in different colors.

That is because each came from a different sweep of transformation, so they
have different marks (colors).  That's precisely the hygiene algorithm at
work: names introduced together are colored together, names introduced
separately are colored separately.

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