String eval has some sort of counter associated with it: 
C:\>perl -le "eval q!die!;print $@"

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output: 
Died at (eval 1) line 1.

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another example: 
C:\>perl -le "eval q!print $^O! for 1..10; eval q!die!;print $@"

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output: 
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
MSWin32
Died at (eval 11) line 1.

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The question is, can I access that counter somehow? For example, I may do some evals myself, but some other code can also do that, so I can't use a simple $counter++ before eval()ing.

In reply to is it possible to access eval() counter? by Anonymous Monk

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