[perl #132711] [LTA] Stupidly using `is assoc` with unary prefix operator has an error message from the deep

[brian d foy]

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I stupidly did this:

    sub prefix:<²>  ( Int:D \m --> Int:D )
        is assoc<right>
        { m ** m }

    put ²(²2);

And got this error:

    ===SORRY!===
    MVMArray: Can't pop from an empty array

I figure that associativity doesn't make any sense for unary prefix
operators but that error message is from pretty deep in the swamp. I'd
rather have something like "Don't do stupid things that make no sense"
sort of error.