# File: Mod.pm
package Mod;
sub import { print `date`; sleep 10 };
1;

# File: code.pl
BEGIN { print `date` }
use Mod;
I'm a little tea pot.

# Command line-
moo@cow~>perl code.pl || date
Fri Mar 30 09:37:09 PDT 2018
Fri Mar 30 09:37:09 PDT 2018
syntax error at code.pl line 3, at EOF
Execution of code.pl aborted due to compilation errors.
Fri Mar 30 09:37:19 PDT 2018