RE: [Haskell-cafe] rewrite rules

| I have a rewrite rule as follows: | | {-# RULES | "transform/transform" forall (f::forall m. Monoid m => (a -> m) -> (b - | > m)) | (g::forall m. Monoid m => (b -> m) -> (c | -> m)) | (l::FMList c). transform f (transform g | l) = transform (g.f) l | #-} | | It fires on this code: | | print $ transform (. (*2)) (transform (. (+1)) (upto 10)) | | But it doesn't fire on this code: | | print $ map (*2) (map (+1) (upto 10))) That's odd. It works for me. Specifically, I compiled the attached code with GHC 6.10, and I get two firings of transform/transform. Does that not happen for you? Simon