tracks/haskell/exercises/zebra-puzzle/src/ZebraPuzzle.hs in trackler-2.0.6.11 vs tracks/haskell/exercises/zebra-puzzle/src/ZebraPuzzle.hs in trackler-2.0.6.12

@@ -6,7 +6,7 @@
 data Solution = Solution { waterDrinker :: Resident
                          , zebraOwner :: Resident
                          } deriving (Eq, Show)
 
 solve :: Solution
-solve = undefined
+solve = error "You need to implement this function."