@@ -13,7 +13,7 @@ module Maybe where
1313-}
1414
1515import Basics (not, (.))
16−import List (foldr)
16+import List (foldr, (::))
1717
1818{-| The Maybe datatype. Useful when a computation may or may not
1919result in a value (e.g. logarithm is defined only for positive