Could it be that filehandle IN is related to an intermediate file created by the program? Given that the other bug mentioned is also about the same line.

In reply to Re^2: Use of uninitialized value in subroutine entry at /home/roarce/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0/Seeder/Finder.pm line 476, <IN> line 8192. by bliako
in thread Use of uninitialized value in subroutine entry at /home/roarce/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0/Seeder/Finder.pm line 476, <IN> line 8192. by roarce92

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.