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My favorite error handling pattern was Windows 'call a function, check the result, if null call a different function to get the last error, then another function to format that error into a string".

it's like the function is screaming MU! at you

no problem: {fun (foo) -> bar end}

erlang and its siblings tend to use {:ok, value} and {:error, error} tuples as return values (I think elixir is a little more consistent)