Subject: Re: bug#66178: 30.0.50; cperl-mode inconsistent hash key fontification

From: Mauro Aranda <[email-masked]>
Date: Sun, 24 Sep 2023 19:21:02 -0300

tags 66178 notabug
close 66178
quit

On 24/9/23 10:44, Harald Jörg wrote:
 > tags 66178 + wontfix
 > thanks
 >
 > Mauro Aranda <[email-masked]> writes:
 >
 >> emacs -Q
 >> C-x C-f bug.pl
 >> M-x cperl-mode
 >> my %factorial = (
 >>           0 => 1,
 >>           zero => 1
 >>          );
 >>
 >> zero is recognized as a string, 0 is not.
 >
 > This might look surprising, but it is intentional.
 >
 > zero is a bareword which undergoes hash-key stringification.
 >
 > The digit 0, on the other hand, is converted to a string according to
 > Perl's type conversion rules.  That is a different thing: Perl's type
 > conversion converts all of 0, 000, 0.0, 0E0 to the hash key "0".
 >
 > Let me expand your example to demonstrate some more cases where the hash
 > key is (correctly) not fontified as a string:
 >
 > my %hash = (
 >      "0"    => 'The string "0"',
 >      "00"   => 'The string "00"',
 >      0      => 'A number which is converted to the string "0"',
 >      00     => 'A number which is converted to the string "0"',
 >      0.0    => 'A number which is converted to the string "0"',
 >      0E0    => 'A number which is converted to the string "0"',
 >      zero   => "A bareword which is stringified",
 >      zero() => "The function's return value is the key",
 >      +zero  => "The function's return value is the key",
 > );

Thank you for the explanation, it makes more sense to me now.  I'm
tagging this one as notabug and closing.