Dear GHC team, I tried ghc-6.12.0.20091010-src.tar.bz2 on Linux, Debian, i386-* And it cannot compile my Dumatel project. It fails at the segment: module Bug where compose :: [a -> a] -> a -> a compose = foldr (.) id class Compose a where compose1 :: a -> a -> a ghc -c -O Bug.hs reports /tmp/ghc29984_0/ghc29984_0.s: Assembler messages: /tmp/ghc29984_0/ghc29984_0.s:23:0: Error: symbol `Bug_compose1_closure' is already defined /tmp/ghc29984_0/ghc29984_0.s:102:0: Error: symbol `Bug_compose1_info' is already defined `-O' is essential here. Regards, ----------------- Serge Mechveliani mechvel@botik.ru