May not be appropriate, but you can use the if pragma to conditionally load a module.
use if $some_condition, Three;
(That's page 1019 in the Fourth Edition of The Camel, in case you have a dead tree version, which I do.)
Alex / talexb / Toronto
Thanks PJ. We owe you so much. Groklaw -- RIP -- 2003 to 2013.
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