I checked your snippet with same results like you. So I'm now more unillumined as before my post. I played a little bit with your code and find that there must be a local $@ in the code hierarchy. I'm relative sure that is not explicit set inside of my code. Maybe in a module I use but I do not understand why it is localized. Can someone please give me a hint how to find the place where $@ is maybe localized. Thanks in advance.

In reply to Re^2: 5.10 shows uninitialized $@ warning by pmSwim
in thread 5.10 shows uninitialized $@ warning by pmSwim

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