I was thinking about that yesterday, but I couldn't figure out where to look to get the required info in a reliable fashion.
The obvious place to look is in %INC. But that gives you munged names, and only on a per file included basis. Files that define multiple packages would not be handled properly.
Based on my investigation of perlguts and perlapi each namespace has a stash associated with it. So if you have a list of all the stashes, you can get their names, and if you have their names, you have all the namespaces you want to add a perverse DESTROY method to.
Do you have any idea where to find either a list of active namespaces or stashes?
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