GNU bug report logs -
#25166
It shouldn't be possible to set the function cell of t
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Reported by: Philipp <p.stephani2 <at> gmail.com>
Date: Sun, 11 Dec 2016 09:47:02 UTC
Severity: wishlist
Tags: wontfix
Found in version 26.0.50
Done: Noam Postavsky <npostavs <at> users.sourceforge.net>
Bug is archived. No further changes may be made.
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Glenn Morris wrote:
> Philipp wrote:
>
>> You can set the function cell of nil and t using `fset' and friends.
>> But you can't call the `nil' function using (nil) (it does work with
>> (t)). I think that attempting to set the function cell of nil and t is
>> almost always a bug -- probably the programmer wanted to set a real
>> symbol, but some of the constants got passed. I propose to signal an
>> error (e.g. `setting-constant') whenever the function cell of nil and t
>> is modified; maybe the same should happen for keywords.
>
> I just did this yesterday...
> See https://debbugs.gnu.org/25110, ba8e883, and 3fd4433.
And now see also ffb1302. :)
Anyway, I only did "nil", since as you say "t" can actually be called as
a function. But you are right that it's probably unintended.
This bug report was last modified 7 years and 267 days ago.
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