I agree with this very much. But I think it is a hard problem. The intention of this pragma would be to make cycles caused via capture easier to spot in code review.
Its not really that hard :) Devel::Cycle - Find memory cycles in objects
It is easy to modify perlcritic ProhibitConditionalDeclarations to alert yo to closures for a code , and then you can further investigate to decide if they're really trouble, or ok
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