I tried this: instance Show Operace where show (Op op str inv) = show str But I still … The above does indeed work in GHCi: > :t abs' abs' :: (Num a, Ord a) => a -> a For other expressions, such as do blocks, you'll need to use the non-layout syntax with curly braces and semicolons (eugh). I'm not aware of any single definition in Haskell that must be written on multiple lines. 5.

Viewed 27k times 30. I have this type definition: data Operace = Op (Int->Int->Int) String (Int->Int->Int) deriving Show I want to print this type into the interactive shell (GHCi). Haskell: Deriving Show for custom type. All that should be printed is the String field.

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