[Haskell-cafe] Template Haskell vs Rewrite Rules?

I'm working on getting annotated versions of all instances of a function of a typeclass, and was wondering what are the relation/differences between Template Haskell and the Rewrite Rules section. Of course this is specific to GHC. Another question, in Racket, primitive function application is denoted #%app. And using macros I can re-export #%app to be a different function f, so a program: (g a) is rewritten into (f g a) is there a way to do the same thing using TH or Rewrite Rules? Thanks -- Ismael