From perlsyn (5.22.1 at least): 
    As a special case, if the test in the "for" loop (or the corresponding
    "while" loop) is empty, it is treated as true. That is, both

        for (;;) {
            ...
        }

    and

        while () {
            ...
        }

    are treated as infinite loops.

In reply to Re: Why is the null while-loop condition expression true? by Paladin
in thread Why is the null while-loop condition expression true? by AnomalousMonk

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