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

Here's another way to do it: data ValType = FloatType | IntType | StringType deriving (Show,Eq) instance Hashable ValType where hash FloatType = 0 hash IntType = 1 hash StringType = 2 data VarName = VarName ValType String deriving (Show,Eq) instance Hashable VarName where hash (VarName t n) = hash (t, n)