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That's not quite correct... IO::Prompt returns an object, in that object bool is overloaded, and bool sets $_. (which is run for each iteration of the while to decided if it's a true or false value) Which means that while ($z = prompt "") { will set $_ and $z. This is a bad idea. What if the code is used in an inner loop? when the outer loop uses $_ for example? If one wants to get the same behaviour then it would be enough to do a simple assignment in the subroutine to $_ and return the value of $_. Example code that is similar to the code in IO::Prompt
Update: added relevant part of IO::Prompt In reply to Re^2: sub that sets $_
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