# noname1.pm:
use strict;
use warnings;

package noname1;

sub get_value {
    return $missingVar // 'Bogus value';
}

1;

##</code><code>##

# noname.pl:

use warnings;
use strict;
use lib '.';
use noname1;

print noname1::get_value();

##</code><code>##

Compilation started at Sun Dec 13 22:16:46

C:/Perl_524/bin\perl.exe -w d:/tmp/pm/noname_strictures/noname.pl 
Global symbol "$missingVar" requires explicit package name (did you forget to declare "my $missingVar"?) at noname1.pm line 9.
Compilation failed in require at d:/tmp/pm/noname_strictures/noname.pl line 6.
BEGIN failed--compilation aborted at d:/tmp/pm/noname_strictures/noname.pl line 6.

Compilation exited abnormally with code 255 at Sun Dec 13 22:16:46