Say, you have a defined order of evaluation, and you define the order of evaluation for comma in list context from left to right. You also have lazy evaluation.

Now, in the following expression, which one will be evaluated first, g() or h():

    sub f ($$) {$_ [1] && $_ [0]}
    f (g (), h ())
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The biggest problem I have with defining the order of evaluation is that people will start to write code that depends on it. It will mean that the code is fragile, and. specially in combination with lazy evaluation, hard to understand. If the order of evaluation is undefined, the code has to be correct, no matter in which order it's evaluated. That makes code easier to understand (because any order I choose is ok).

Abigail