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bug#34085: autoscan reports a warning
From: |
Danny Milosavljevic |
Subject: |
bug#34085: autoscan reports a warning |
Date: |
Wed, 16 Jan 2019 17:29:16 +0100 |
Hi,
On Tue, 15 Jan 2019 10:43:49 -0500
Joshua Branson <address@hidden> wrote:
> I'm not certain if this is the right list to report this to, but I just
> installed autoscan version 2.21, and it gave me this warning:
>
> #BEGIN_SRC sh
> autoscan
> #END_SRC
>
> Unescaped left brace in regex is deprecated here (and will be fatal in Perl
> 5.30), passed through in regex; marked by <-- HERE in m/\${ <-- HERE [^\}]*}/
> at /home/joshua/.guix-profile/bin/autoscan line 361.
>
>
> Should I report this upstream instead?
I think so, yes.
autoscan is part of autoconf 2.21, so the bug report should go to the autoconf
package.
The regexp in question is
s/\${[^\}]*}//g;
Perl is complaining because perl regexp use curly braces to specify a range of
valid repeats.
Maybe the easiest way to understand it is that the following equivalences hold
in regexps:
? is equivalent to {0,1}
+ is equivalent to {1,}
* is equivalent to {0,}
The above (at the end of the regexp "\${[^\}]*}") probably means a literal curly
brace--but they don't escape it - hence the warning.
It's only a warning because no valid repeat range can start with a closing curly
brace.
So perl can still figure out what you meant.
But it's obviously not recommended to use unescaped closing curly braces to
match a literal closing curly brace regardless.
pgpDHtfrdtlBJ.pgp
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