[Haskell-beginners] formatting?

Hi, tensDigit.hs tensDigit :: Integral a => a ->a tensDigit x = d   where xLast = x `div` 10             d         = xLast `mod` 10 prelude> load tensDigit.hs parse error on input ‘=’ Perhaps you need a 'let' in a 'do' block? e.g. 'let x = 5' instead of 'x = 5' 4 |             d         = xLast `mod` 10   |                       ^ [1 of 1] Compiling Main             ( chapter7_8.hs, interpreted ) Failed, no modules loaded. I suspect this has something to do with the spacing (since this is example code) if so could someone explain to me what the rules on spacing are so I can get past this. I am using a simple text editor so if someone has a recommendation for an IDE that simply takes care of this, much obliged!! best,