[jhc] How to fire jhc rules

Dear haskellers, In learning to use rules with jhc 0.7.6-3, I am trying to compile the following test program with flags -f global-optimize -f rules, but it seems I cannot get rule "hf" to fire. I've compiled the program with ghc and the rule is applied in that case. -------------------------- {-# NOINLINE f #-} f x = x ++ "f" {-# NOINLINE h #-} h x = x++"h" {-# RULES "hf" forall x. h (f x) = x #-} main = putStr (h (f "1")) -------------------------- Rule "hf" is not preserving semantics so I can see if the rule is applied by executing the result. I would be thankful for any hint on how to get the rule applied as well as how to get jhc to report which rules it has applied during compilation. Best, Facundo