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)
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