Well, that explains it. use Foo does this: 
BEGIN {
    require Foo;
    Foo->import;
}

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If you use OO, require will find your module, but of course the module will still create the Data::Validator::OO package and not an OO package, causing the following OO->import to fail (silently).

Makeshifts last the longest.

In reply to Re^3: use constant and exporter by Aristotle
in thread use constant and exporter by Flame

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