Hello wanna_code_perl,

Note that use MODULE LIST is equivalent to BEGIN { require MODULE; MODULE->import( LIST ); }; so, if you have:

use Exporter::Easy (
    OK      => [ keys %subs ],
    TAGS    => 
        all => [ keys %subs ],
    ],
);
[download]

the implicit BEGIN block invokes a reference to the %subs hash before it has been initialised. Changing to require works for me (i.e., it passes your test script with either use Foo qw/subA subB Abus Bbus/; or use Foo ':all';):

require Exporter::Easy;
Exporter::Easy->import(
    OK      => [ keys %subs ],
    TAGS    => [
        all => [ keys %subs ],
    ],
);
[download]

Hope that helps,