Thanks. I've fixed this. Ian: pls merge if time. Simon Fri Oct 2 12:15:49 BST 2009 simonpj@microsoft.com * Fix pretty-printing precedence for equality constraints M ./compiler/types/TypeRep.lhs -1 +7 From: glasgow-haskell-users-bounces@haskell.org [mailto:glasgow-haskell-users-bounces@haskell.org] On Behalf Of Sean Leather Sent: 15 September 2009 12:51 To: GHC Users List Subject: Malformed class assertion with GHCi's output (a -> a ~ T a) I queried (:t) the type of something in GHCi, and it told me the value should have the constraint (a -> a ~ T a) among others. When I tried to use this in code, I got a "malformed class assertion." So, I put parentheses around the function type, ((a -> a) ~ T a), and everybody is happy again. Is there something off about the precedence of (~) vs. (->)? Should GHCi print the parentheses? I'm using GHC 6.10.1, so this might already be fixed. Regards, Sean