Re: [Haskell-cafe] deriving Data.HashTable - stack overflow

I chose not to introduce another dependency. I just implemented the hash function by delegating to the Show instance of the nested type: data ValType = FloatType | IntType | StringType deriving (Show,Eq) data VarName = VarName ValType String deriving (Show,Eq) instance Hashable VarName where hash (VarName t n) = hash (show t ++ n) Not super-efficient, but it'll be fine. The printString function (defined in that other package) uses a single character prefix for each ValType. - Lyle