> OK, I think I've got the idea now. But still, I'm surprised that `setq'
> is not among the list of "destructive functions". What's that about?
You're right: `setq' is also destructive. But it's slightly different (the
difference has to do with the notion of "pointer aliasing").
In Scheme destructive operations are traditionally named with a "!" suffix,
so `setq' is actually called `set!'.
As for me, I'd rather get rid of `setq' and `set!' altogether.
That's basically what SSA does behind the scenes ;-)
Stefan
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