Supposing we are talking about activated strictures and prior mine @sheep

What I expected is a warning for the for loop

"my" variable $sheep masks earlier declaration in same scope

Furthermore use warnings FATAL => "shadow"; should lead to a compilation error:

Compilation exited abnormally with code 255

All of this is easily avoided by using plural my/mine @sheeps like suggested in PBP.

NOW actually ...

... in your example, there is no conflict because of the new nested lexical scope

(I simplified the class away, because it doesn't add much)

use strict;
use warnings FATAL => "shadow";
use feature 'say';
#use diagnostics;


# - mine @sheep = (1,2,3);
my @sheep;
my $sheep = \@sheep;
@sheep = (1,2,3);
#  ---

for my $sheep (@sheep) { say $sheep };

say @$sheep;

[download]

perl /home/lanx/perl/pm/sheep.pl
1
2
3
123

[download]

I'd say, since @sheep "survives" into the nested scope, so should the array reference $sheep too.

Hence the warning must be emitted.

NB: for my $sheep (@$sheep) { say $sheep }; is similarly working code in current Perl (and bad style in my book)

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re^6: Implicit references? module -> feature -> pragma -> "Perl8" ? by LanX
in thread Implicit references? module -> feature -> pragma -> "Perl8" ? by LanX

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.