sorry, my memory was wrong one gets a

Name "main::x" used only once: possible typo at ... warning.

But putting the require into a begin block really helps. 8)

> cat mod.pm tren prog.pl tren; perl prog.pl
$x="X";
 
1;
------------------------
use strict;
use warnings;
 
#our $x;
#BEGIN { 
  require mod; 
#}
 
 
print $::x;
------------------------
Name "main::x" used only once: possible typo at prog.pl line 10.
X
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