[Haskell-cafe] Use of Data.Generics.everywhere'

Hi, I'm looking into SYB, and I'm trying to find examples where people have used everywhere' (note: not everywhere, but with a \prime) - unfortunately I can't find any. I've tried Google Code Search, and it comes up with one rather trivial example which could equally have been everywhere. The original SYB paper doesn't give an example of everywhere' in use. So is everywhere' useful for anything? Has anyone used everywhere' in practice? Thanks Neil