* bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists
@ 2014-09-25 4:05 Leo Liu
2014-09-25 7:21 ` Andreas Schwab
2019-09-30 2:39 ` Stefan Kangas
0 siblings, 2 replies; 3+ messages in thread
From: Leo Liu @ 2014-09-25 4:05 UTC (permalink / raw)
To: 18555
(nbutlast '(1 2 . 3))
throws an error due to `length' which can be fixed
by using safe-length instead.
(butlast '(1 2 . 3))
still throws an error due to copy-sequence not taking
improper list.
What is the right thing to do?
Leo
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists
2014-09-25 4:05 bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists Leo Liu
@ 2014-09-25 7:21 ` Andreas Schwab
2019-09-30 2:39 ` Stefan Kangas
1 sibling, 0 replies; 3+ messages in thread
From: Andreas Schwab @ 2014-09-25 7:21 UTC (permalink / raw)
To: Leo Liu; +Cc: 18555
Leo Liu <sdl.web@gmail.com> writes:
> (nbutlast '(1 2 . 3))
>
> throws an error due to `length' which can be fixed
> by using safe-length instead.
>
> (butlast '(1 2 . 3))
>
> still throws an error due to copy-sequence not taking
> improper list.
>
> What is the right thing to do?
Don't do that then.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists
2014-09-25 4:05 bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists Leo Liu
2014-09-25 7:21 ` Andreas Schwab
@ 2019-09-30 2:39 ` Stefan Kangas
1 sibling, 0 replies; 3+ messages in thread
From: Stefan Kangas @ 2019-09-30 2:39 UTC (permalink / raw)
To: Andreas Schwab; +Cc: 18555, Leo Liu
tags 18555 + notabug wontfix
close 18555
quit
Andreas Schwab <schwab@suse.de> writes:
> Leo Liu <sdl.web@gmail.com> writes:
>
>> (nbutlast '(1 2 . 3))
>>
>> throws an error due to `length' which can be fixed
>> by using safe-length instead.
>>
>> (butlast '(1 2 . 3))
>>
>> still throws an error due to copy-sequence not taking
>> improper list.
>>
>> What is the right thing to do?
>
> Don't do that then.
Agreed. Both butlast and nbutlast are documented to work on lists, and
throwing a malformed list at them should correctly signal an error.
I'm therefore closing this bug report.
Best regards,
Stefan Kangas
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-09-30 2:39 UTC | newest]
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2014-09-25 4:05 bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists Leo Liu
2014-09-25 7:21 ` Andreas Schwab
2019-09-30 2:39 ` Stefan Kangas
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