Is there any documentation for that somewhere?

Well, as I indicated in my first posting in this thread, caller() would usually return something::__ANON__. So I guess that chromatic's idea is basically, 'Why not just make __ANON__ an alias to what we need?'.

I don't know if this is documented; and probably I wouldn't have been able to work this out myself.

In reply to Re^3: How to fool caller() / use NEXT within a dynamic sub by betterworld
in thread How to fool caller() / use NEXT within a dynamic sub by betterworld

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