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Re: when GC is permitted

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   From: tb@xxxxxxxxxx (Thomas Bushnell, BSG)
   Date: 11 Jan 2004 15:37:24 -0800

   This is would be the first SRFI to say "if your Scheme is too fancy,
   you can't implement this."

Nope, that honor belongs to SRFI-0.  SRFI-0 assumes that a
Scheme implementation implements a fixed set of SRFIs that
are all always available.  There is no sensible way to
implement it in a system with optional modules, as are found
in PLT and Scheme 48.  This was pointed out during the
discussion period and it was finalized anyway.

There may be others, but SRFI-0 is definitely the first.

                                    -Richard Kelsey