I don't get any such warnings. And I don't see anything that should cause the warning you describe. Could you provide the exact error message? Are you sure the .pm files you think are being loaded are actually the ones being loaded?
>perl -lw sand_parent.pl
5
6
>perl -v
This is perl, v5.8.8 built for MSWin32-x86-multi-thread
(with 25 registered patches, see perl -V for more detail)
$ perl -lw sand_parent.pl
5
6
$ perl -v
This is perl, v5.8.4 built for i386-linux-thread-multi
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