GNU bug report logs - #6878
bool-vectors of length 0 signal error when aref/aset the 0th element

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Package: emacs;

Reported by: MON KEY <monkey <at> sandpframing.com>

Date: Wed, 18 Aug 2010 04:19:02 UTC

Severity: minor

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: MON KEY <monkey <at> sandpframing.com>, 6878 <at> debbugs.gnu.org
Subject: bug#6878: bool-vectors of length 0 signal error when aref/aset the 0th element
Date: Thu, 19 Aug 2010 16:47:36 +0200

>> Maybe, but this is not what the manual has to say of the particular type of
>> array that is a bool-vector, again (note the "must"):
>> ,---- (info "(elisp)Bool-Vector Type")
>> | "A "bool-vector" is a one-dimensional array of elements that must be `t'
>> | or `nil'."
> All elements of (make-bool-vector 0 t) are either t or nil.

Indeed, this is trivially (and vacuously) true.  Actually, we can even
say that all elements of a 0-length vector (bool or not) are both nil
and t at the same time.


        Stefan
This bug report was last modified 14 years and 355 days ago.

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