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Re: [Chicken-users] [Chicken-hackers] 4.9.0rc1: Error: (assv) bad argume

From: Andy Bennett
Subject: Re: [Chicken-users] [Chicken-hackers] 4.9.0rc1: Error: (assv) bad argument type: null
Date: Sun, 04 May 2014 13:33:32 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.4.0


> The error on 4.9.0rc1 is likely due to 0a52536, which made `assoc`,
> `member` et al. signal errors when their second arguments aren't lists
> instead of just returning #f (or the sentinel value). This is new
> behavior since 4.7.0, and IIRC there were a couple of places in CHICKEN
> itself that required updating after this change too, since they were
> also relying on these cases returning #f.
> Anyway, when passed `eqv?` as a comparator *before* importing numbers,
> `alist-ref` uses CHICKEN's built-in `assq` for the search, including
> this new behavior. *After* importing numbers, however, you're really
> passing the numbers extension's version of `eqv?`, which `alist-ref`
> doesn't take as a signal to use the built-in `assq` and instead falls
> back to a search function that matches the pre-0a52536 (i.e. 4.7.0)
> behavior and returns #f/the sentinel value.

Thanks for the detailed reply Evan! :-)

Of course, my code is wrong but it was the inconsistent behaviour with
and without numbers that I was worried about. I shall change my code to
be correct.

This should mean that I will be able to use 4.9.0rc1 to build working
binaries for Knodium that I will deploy at

Are the CHICKEN web services currently built with 4.9.0rc1?

> @ -hackers: I think `alist-ref`'s fallback search function should match
> the behavior of core's versions. Objections?

I agree.
Thanks for the patch Peter.



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