You've hit a tricky question. That syntax is associated with attributes, base, and other half-formed parts of perl. You may want to avoid that until it stabilizes.

What I know about the subject is covered in the thread my Dog $spot;.

After Compline,
Zaxo

In reply to Re: Knowledge about typed lexicals and the access check by Zaxo
in thread Knowledge about typed lexicals and the access check by Tobiwan

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