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  1. or download this
    package Pileofrogs::Util;
*{"Pileofrogs::Frob::frob"} = \*{"Pileofrogs::Util::frob"};
...
package main;
Pileofrogs::Frob->frob;
Pileofrogs::Util->frob;
  2. or download this
    package Pileofrogs::Frob;
use Carp 'carp';
...
    carp "You should really use Pileofrogs::Util::frob";
    Pileofrogs::Util->frob( @_ );
}