It seems to be more complicated than just "PAR wraps your script in a subroutine, and that's the source of the problem." If that were the case, then any program that uses the cache/closure idea should cause the warnings.

The toy script in the OP generates the warnings, but another script where I did something similar did not.

So I'll have to work up an example along the lines of the toy script, but doesn't generate the warnings, and show the minimum tweak that does generate the warnings. (Or some kind soul can chime in with a satisfying explanation.)

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to Re^2: PAR: Variable %x will not stay shared by QM
in thread PAR: Variable %x will not stay shared by QM

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.