perl is smart enough that multiple use statements will not result in the warning you describe - each package will be compiled and each namespace will be populated only once. This includes cases with circular dependency, though resolving that is likely worth your time. My guess is that at some point during a refactor, the programmer forgot to delete the old version of the subroutine in the original module. Something which is the structural equivalent of 

#!/usr/bin/perl
use strict;
use warnings;

use Scalar::Util qw(looks_like_number);

sub looks_like_number($) {
    1;
}

[download]

It may be innocuous, but chances are good that the subroutines are not identical. A simple file search for sub someSubNameHere will likely show you all occurrences and lead you to the appropriate solution.

In reply to Re: How to located cause of 'Subroutine SomeSubName redefined...' warnings by kennethk
in thread How to located cause of 'Subroutine SomeSubName redefined...' warnings by Anonymous Monk

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.