I was going to propose a very similar angle, only I'd use B::Xref as it does 90% of what you need for this job. Its output is also more consistent and easier to parse for as this task.

Makeshifts last the longest.

In reply to Re^2: Check a perl script for repeat "my" declarations (use B::Xref) by Aristotle
in thread Check a perl script for repeat "my" declarations by graff

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