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/usr/share/perl/5.14.2/open3.pl is in perl-modules 5.14.2-6ubuntu2.

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warn "Legacy library @{[(caller(0))[6]]} will be removed from the Perl core distribution in the next major release. Please install the separate libperl4-corelibs-perl package. It is being used at @{[(caller)[1]]}, line @{[(caller)[2]]}.\n";

# This legacy library is deprecated and will be removed in a future
# release of perl.
#
# This is a compatibility interface to IPC::Open3.  New programs should
# do
#
#     use IPC::Open3;
#
# instead of
#
#     require 'open3.pl';

package main;
use IPC::Open3 'open3';
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