Oh, you're right.

I found this from http://perldoc.perl.org/perlop.html#Auto-increment-and-Auto-decrement:

Note that just as in C, Perl doesn't define when the variable is incremented or decremented. You just know it will be done sometime before or after the value is returned. This also means that modifying a variable twice in the same statement will lead to undefined behavior.

In reply to Re^3: question 1st - undefined behaviour by Riales
in thread question 1st - undefined behaviour by rumos2

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