Thanks for your answers. Switching to a for solved that problem (I could not have rewritten it with a simple loop, as I have a lot of when in a Lex-like code).

If I understand correctly the fact that in v5.16 the same code gives an infinite loop, it's that the given's version of $_ have been "fixed", in the sense that a new scalar is now created for each iteration (hence the pos() function and the matching are in accord). But the same thing with the for loop will still work as I expect ?

If the when construct does not care from where does the $_ variable comes from, do you know what was the need to introduce given rather than just stick with for ?

Anyway, thanks for your help!

In reply to Re^2: Using pos() inside given/when by Anonymous Monk
in thread Using pos() inside given/when by Anonymous Monk

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