Well, then I guess it's a bug since then it should probably emit a parser error.

But note that this works:

sub CLASS_DEFINITION:

    ATTRIBUTES:
        PRIVATE:    pvt_at1 pvt_at2 pvt_at3
        PROTECTED:  ptc_at1 ptc_at2 ptc_at3
        PUBLIC:     pub_at1 pub_at2 pub_at3
    
    METHODS:
        PRIVATE:    pvt_mt1 pvt_mt2 pvt_mt3
        PROTECTED:  ptc_mt1 ptc_mt2 ptc_mt3
        PUBLIC:     pub_mt1 pub_mt2 pub_mt3

;
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code edited: missing ':'
It gets interpreted to a lot of attributes. And it spans multiple lines.

Just a side note, but I actually wrote code that handles this sort of attribute depiction and creates the accessors methods and such.

Somehow, yesterday this all seemed like a very good idea but today it seems like a brain-dead way to do things.
But I'm still curious about all of this. Should I report it as a bug or something like that?