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How to fix “variable not in scope” error in GHCI?

I see you are defining your function in interactive shell. Most of Haskell’s REPLs read and eval instructions line-by-line, so when you type potencia :: Integer -> Integer -> Integer it is interpreted right at this moment, so compiler complains that potencia is lacking implementation. You should either: Define it in external file and load it using :l (recommended) Type :set … Read more

Error haskell: not in scope. What does that mean?

Did error happen when you type the function type in GHCi? If it is the case, you have to use multiple line input And noted , before mod Alternatively, for better workflow, you can save your code to a file and load in GHCi using :load

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