Howdy Perl Studs

I'm beating my head against the wall trying to remember where I saw this / how to do this:

In some documentation I remember seeing a use statement that had some sort of condition.

Its the same idea as how:

 use Foo if $WE_DO_WANT_FOO;

reads (but of course that doesn't work)

It seemed to involve a comma but my old age is sucking away the brain cells faster than I can count...

It did not involve an eval, and it was like:

use Foo, ???;

I seem to think is was in documentation for a pragma or diagnostic/devel type module...

Any memory jogs would be most appreciated!

TIA

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