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Re: A proper tail version of with-fluids
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From: |
Ludovic Courtès |
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Subject: |
Re: A proper tail version of with-fluids |
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Date: |
Fri, 04 Jan 2013 00:36:42 +0100 |
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User-agent: |
Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.2 (gnu/linux) |
Hi Stefan,
Stefan Israelsson Tampe <address@hidden> skribis:
> (define f (lambda (n) (if (= n 0) (fluid-ref a) (with-fluids ((a n)) (f (-
> n 1))))))
>
> with the modified VM:
> scheme@(guile-user)> (f 10000000)
> $2 = 1
>
> with the old VM, it craches. It works!
Hmm, I can’t see how ‘with-fluids’ or ‘parameterize’ could be
tail-recursive given that it uses ‘dynamic-wind’. Am I missing
something?
Ludo’.