Update: After enabling warnings in the command line, I got the same warnings in 5.39.4. So, disregard this node.

You don't show enough for us to answer. I tried the following in two different versions of Perl (one of them older and one newer than 5.36).

I saved the following script as 2.pl: 

#!/usr/bin/perl
use strict;
use feature qw{ say };
use warnings;

my $x = 10;
for my $i (1 .. 10) {
    $x += $i;
}

[download]

I then ran 

perl -d 2.pl

[download]
using both the Perl versions.

5.26.1: 

  DB<1> @lines=@{"_<2.pl"} ; for my $i (0 .. $#lines) { CORE::say $lin
+es[$i] == 0 }
1
1



1



1

[download]

5.39.4 (blead): 

  DB<1> @lines=@{"_<2.pl"} ; for my $i (0 .. $#lines) { CORE::say $lin
+es[$i] == 0 }
1
1
1
1
1
1



1

[download]

The output is different, but there's no warning.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Perl 5.36 warns for magic comparison by choroba
in thread Perl 5.36 warns for magic comparison by hurricup

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.