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I'm not happy about the behaviour of join here, because there is no way how CORE::join() will ever assign to the lvalue.
So it should act like handling copies. I'm aware that we can override built-ins like join, so accessing the alias should still be possible. Theoretically that is.
UpdateOn second thought, a general new Warning in case of side effects of altered repeated variables as arguments may be more effective.
Cheers Rolf In reply to Re^4: ${^POSTMATCH} problem
by LanX
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