if you really want to do it, you can use a CHECK block to browse all the symbol tables once all the modules and the script have been loaded and parsed, examining with packages subclass your special classes and that they don't redefine the methods you want to protect.

You can even use a subrutine attribute to do it (as :final).

Though modules could still work around that defining new methods at runtime via eval or just playing with the symbol tables.

In reply to Re^2: checking a method is not subclassed by salva
in thread checking a method is not subclassed by water

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