That's not what I get nor what I would expect (but this is not in debug mode):

Win8 Strawberry (32) Sun 10/11/2020 21:47:54 C:\@Work\Perl\monks >perl -Mwarnings my $a=$x=$y=$z = 1; print "|$a|$x|$y|$z|"; ^Z |1|1|1|1| Win8 Strawberry (64) Sun 10/11/2020 21:45:55 C:\@Work\Perl\monks >perl -Mwarnings use v5.10; my $a=$x=$y=$z = 1; say "|$a|$x|$y|$z|"; ^Z |1|1|1|1|


What about

my $a=$x=$y=$z = foo()
With respect to this specific statement:
Win8 Strawberry (32) Sun 10/11/2020 21:48:09 C:\@Work\Perl\monks >perl -Mstrict -Mwarnings use Data::Dump qw(dd); sub foo { return 9, 8, 7; } my ($x, $y, $z); my $a = $x = $y = $z = foo; dd $a, $x, $y, $z; ^Z (7, 7, 7, 7)
Same result under version

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: What's happening in this expression? (Updated) by AnomalousMonk
in thread What's happening in this expression? by zapdos

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, 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, 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.