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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Question about GC in C code.
Date: Wed, 13 Nov 2002 23:10:01 -0500
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    How about if alloc.c was modified so other code could register a function
    to be called when GC occurs?  That function could then mark lisp
    objects as needed.

Would it really make a big difference?  I don't see it.  It would be a
simplification in something already simple, that is only done very
rarely.  Why do you think this would be a big improvement?