Thanks starbolin, to fix the cause of the problem is for me the the best solution. Your doubts are right. Between my "global" sig `die` handler and the one shown was a place where I make 
local $SIG{'__DIE__'};

[download]
As I removed this, the real error message occurs from "global" handler and was fixed easily.

In reply to Re^4: 5.10 shows uninitialized $@ warning by pmSwim
in thread 5.10 shows uninitialized $@ warning by pmSwim

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