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Postings from July 2022
On Fri, Jul 22, 2022 at 01:23:04PM +0000, Konovalov, Vadim via perl5-porters wrote:
> My scripts suddenly stopped working in newer perl because they use $00 variable.
>
> $ perl -we '$00'
> Numeric variables with more than one digit may not start with '0' at -e line 1.
I'm confused by why you ever thought this would work. perlvar clearly
says
Variable names in Perl can have several formats. Usually, they must
begin with a letter or underscore ...
Perl variable names may also be a sequence of digits, a single
punctuation character, or the two-character sequence: "^" (caret or
CIRCUMFLEX ACCENT) followed by any one of the characters "[][A-Z^_?\]".
These names are all reserved for special uses by Perl; for example, the
all-digits names are used to hold data captured by backreferences after
a regular expression match.
git blame says that section was last modified in 2015, but there is
similar language saying that identifiers need to start with a letter
or underscore in perldata in perl 5.004, which dates back to 1997.
> This works well in 5.26.0
>
> What this behaviour degrade was for?
It seems to me the change that broke your scripts was actually fixing
a bug that was allowing illegal variable names that are reserved by
Perl for regex backreferences.
Walt
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