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Michael Sperber wrote:

felix> Note that the Chicken FFI (for example) does not allow GC during the
felix> invocation of foreign code,

Sure, and that *greatly* simplifies a lot of issues.  It's also an
unacceptable restriction for many Scheme systems.

Well, I wonder what that should be. Could you provide an example?
(Note that callbacks can GC, so I don't see the slightest reason
why this should be a restricition, condidering that it once and
for all solves most hairy issues).