Useless use of log in void context

Question

What is wrong with this code?

I get an error: Useless use of log in void context at ./test.pl line 12.

#!/usr/bin/perl

use strict;
use warnings;

log();

sub log {
    print "Test";
    return;
}

Answer 1

log is a built-in Perl function. One way to solve this is to rename your sub:

use strict;
use warnings;

mylog();

sub mylog {
    print "Test";
    return;
}