beanryu, I think you may have 2 separate issues:

1. Don't name your module "test". I think there's already a std module with that name.

2. You don't need to use Exporter. Just do this:

In MyTest.pm:

package MyTest;
use Modern::Perl; # or strict, warnings
our $x = 'hi';
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and in main.pl:

use Modern::Perl;
use MyTest;
say $MyTest::x;
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Finally, if main.pl fails to find MyTest.pm, you'll need a use lib 'path/to/your/modules' line before the use MyTest.