/usr/share/perl5/Rex/Exporter.pm is in rex 1.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# (c) Jan Gehring <jan.gehring@gmail.com>
#
# vim: set ts=2 sw=2 tw=0:
# vim: set expandtab:
package Rex::Exporter;
use strict;
use warnings;
our $VERSION = '1.4.1'; # VERSION
use Data::Dumper;
our @EXPORT;
no strict 'refs';
sub import {
  my ( $mod_to_register, %option ) = @_;
  my ( $mod_to_register_in, $file, $line ) = caller;
  if ( exists $option{register_in} && $option{register_in} ) {
    $mod_to_register_in = $option{register_in};
  }
  my $no_import = "";
  if ( exists $option{"-no"} && $option{"-no"} ) {
    $no_import = "," . join( ",", @{ $option{"-no"} } ) . ",";
  }
  for my $reg_func ( @{ $_[0] . "::EXPORT" } ) {
    if ( $no_import =~ m/,$reg_func,/ ) {
      next;
    }
    *{ $mod_to_register_in . "::" . $reg_func } =
      *{ $mod_to_register . "::" . $reg_func };
  }
}
use strict;
1;
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