use warnings;

use blah;

sprintf("%d\n", 1); #this is always warned, as it is in a scope with "use warnings" declared

##</code><code>##

package blah;

sprintf("%d\n;", 1); 
1;

##</code><code>##

Useless use of a constant in void context at test1.pl line 5.

##</code><code>##

Useless use of a constant in void context at blah.pm line 3.
Useless use of a constant in void context at test1.pl line 5.