if(require "module/that/does/not/exist") { 
  print "loaded module ok\n"; 
}else{ 
  print "could not load module $@\n"; } 

##</code><code>##

eval { require "module/that/does/not/exist"; }

##</code><code>##

print petrol "hello there !"; 

##</code><code>##

use warnings;
use strict;