tracks/haskell/exercises/bank-account/src/BankAccount.hs in trackler-2.0.6.11 vs tracks/haskell/exercises/bank-account/src/BankAccount.hs in trackler-2.0.6.12

@@ -7,15 +7,15 @@
     ) where
 
 data BankAccount = Dummy
 
 closeAccount :: BankAccount -> IO ()
-closeAccount = undefined
+closeAccount = error "You need to implement this function."
 
 getBalance :: BankAccount -> IO (Maybe Integer)
-getBalance = undefined
+getBalance = error "You need to implement this function."
 
 incrementBalance :: BankAccount -> Integer -> IO (Maybe Integer)
-incrementBalance = undefined
+incrementBalance = error "You need to implement this function."
 
 openAccount :: IO BankAccount
-openAccount = undefined
+openAccount = error "You need to implement this function."