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@-interpolation in a string dates back to Perl version 5.000.
Oh, you young'uns. (:
It dates back way before that. I've personally used @-interpolation in strings in Perl v3.
What changed with Perl5 was that the DWIM of optional interpolation was removed.
The only reason the second example needs to be fatal in Perl5 is so that the change in behavior was not a "silent change".
I suspect you know all of this, but your node was at least misleading so I felt clarification was in order.
In reply to Re^2: Use B::Deparse to see why (age)