[Haskell-cafe] type class constraints headache

When writing a command-line interface I ran into type class conflicts I don't understand. Could anyone explain why ghc 6.10.4 compiles this

methods :: (Eq a) => [(String, a)] methods = [ ("method1", undefined ) , ("method2", undefined) ]

but not the following?

methods :: (Eq a) => [(String, a)] methods = [ ("method1", undefined ) , ("method2", undefined) ]

enumerateMethodNames :: [String] enumerateMethodNames = map fst methods

thanks, Marcus -- View this message in context: http://old.nabble.com/type-class-constraints-headache-tp27752745p27752745.ht... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.