You can't have more than one statement modifier (if, unless, for, foreach, while, until, .. am I missing any?) at a time. One reason you can't is that trying to figure it out in one's head is next to impossible, so trying to get a computer to do it in a way that users (perl programmers) expect would be a futile excersise.
Which is about the same reason why I think perl 6 still doesn't allow it.
Use more grouping constructs. In general, that would mean parenthesis, but in this case it means braces.
I'd offer an alternative, but I can't quite get my head around what you perceive the precedence of the unless and if are to each other.
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