You need a reference to $var, that's the only possibility.

PadWalker can only help here if you know at least one function using var from the outer scope( see closed_over() )

Sounds very fragile.

Theoretically you could dive into B and try to localize $var from the OP tree but that's a maintenance nightmare.

If its your module just export 

our $varref=\$var

[download]
this doesn't confuse the ref count and is the cleanest approach.

Update: and if you love source filter hacking you could require manually, that is find the module, read the text, append the above line and eval all.

Interesting discussion, though that was most likely an XY Problem... :)

HTH

Cheers Rolf

(addicted to the Perl Programming Language and ☆☆☆☆ :)

PS: I even doubt you can retrieve the ref of a var using B , but I'd love to know.

In reply to Re: Accessing a lexical variable of another file. by LanX
in thread Accessing a lexical variable of another file. by Superfox il Volpone

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.