Well, it's just the first test of this kind -- we don't really test that a submatcher is interoperable with other submatchers. Of course this doesn't mean this sort of test wouldn't be useful -- it would be -- but it means 1) we'd have to go through and add it to every other submatcher and 2) if someone adds a new submatcher they'd have to remember to add this test to stay consistent. I'm not sure it's practical to go that far, so I'd rather not have this kind of test here.