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bug#40693: 28.0.50; json-encode-alist changes alist
From: |
Basil L. Contovounesios |
Subject: |
bug#40693: 28.0.50; json-encode-alist changes alist |
Date: |
Sun, 19 Apr 2020 01:33:55 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Michael Heerdegen <michael_heerdegen@web.de> writes:
> Why? Isn't this a classical example of modifiable code? After some
> iterations
>
> (symbol-function 'fun-withdraw)
>
> =>
>
> (closure
> (t)
> (amount)
> (json-encode-alist
> (cons
> (cons 'tamount amount)
> '((const . some-constant)
> (tamount . 12)
> (tamount . 12)
> (tamount . 12)))))
>
> So the problem is in the implementation of `fun-withdraw', not in that
> of `json-encode-alist' or `sort'.
>
> I mean, it's really an example of an ugly trap, but how is
> `json-encode-alist' different from other functions working with lists
> that would exploit the same problem?
A library function that encodes arbitrary Elisp objects as JSON
shouldn't destructively modify its argument; it should be possible to
call json-encode on the same object twice and get the same result.
--
Basil
- bug#40693: 28.0.50; json-encode-alist changes alist, Ivan Andrus, 2020/04/17
- bug#40693: 28.0.50; json-encode-alist changes alist, Dmitry Gutov, 2020/04/18
- bug#40693: 28.0.50; json-encode-alist changes alist, Basil L. Contovounesios, 2020/04/18
- bug#40693: 28.0.50; json-encode-alist changes alist, Basil L. Contovounesios, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Eli Zaretskii, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Dmitry Gutov, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Eli Zaretskii, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Dmitry Gutov, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Eli Zaretskii, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Dmitry Gutov, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Eli Zaretskii, 2020/04/29
- bug#40693: 28.0.50; json-encode-alist changes alist, Basil L. Contovounesios, 2020/04/29