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- To: JPG at MIT-MC, JONL at MIT-MC
- Subject: Automatic Conversion
- From: Mark L. Miller <MILLER at MIT-AI>
- Date: Sun, 20 Apr 80 22:17:00 GMT
- Cc: BUG-LISP at MIT-AI, BUG-LISPM at MIT-AI, EJS at MIT-MC, H at MIT-MC, KMP at MIT-MC, HENRY at MIT-MC
- Original-date: 20 April 1980 17:17-EST
Why not a several stage conversion process as follows:
0. The current state of affairs (one DO supports both old and new).
1. Rename the current function POSSIBLE-OLD-STYLE-DO and keep supporting it.
Users wanting automatic upwards-compatibility can use MM REPLACE to
change their current code to that. (Using Query Replace, one could even
optionally chose to NOT rename obviously-new-style DO's.)
POSSIBLE-OLD-STYLE-DO would do what DO does now, but be autoloading
and not necessarily efficient. Keep current DO also for a while.
2. Redefine DO to support only the new style after much warning.
3. Eventually delete the autoload property for POSSIBLE-OLD-STYLE-DO from the
This sort of scheme might turn out to be useful for other changes as well.