I tried this, and I'm not sure things played out as you said. After walking the Macro Stepper through "(cas-cad-e 2 ((1) 3))," I saw the unbound identifier error without really seeing two different colorings of mtc. But no big deal: I obviously don't understand hygiene as well as I thought I did, so I'll try to learn more about it on my own.
Incidentally, I was surprised to get the same error when I made mtc a literal, along with go! and break. Does hygiene explain this too? On Sat, Oct 9, 2010 at 2:58 PM, Shriram Krishnamurthi <s...@cs.brown.edu>wrote: > Unfortunately, each of those mtc's is different. > > Let me suggest you do this instead. Put the expression you typed at > the > prompt in the Definitions window, and click on the Macro Stepper > button. Step twice. The coloring is extremely significant (the only > good use of syntax coloring I've seen in my life) -- it represents the > hygienic macro expansion algorithm. > > If this coloring doesn't make sense to you, then you might want to > write a much simpler macro just to explore how hygiene works. > > If this coloring does make sense to you, then you can go back to > understanding its implication for your macro. > > Shriram >
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