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evalReservation :: ReservationExpr ty -> IO ty
evalReservation = evalCmd
evalCmd :: ReservationExpr ty -> IO ty
evalCmd (Log msg) = putStrLn msg
evalCmd (Pure val) = pure val
evalCmd (Bind val next) = evalCmd val >>= evalCmd . next
evalCmd (SearchTrain time) = searchTrainAt time
evalCmd (GetTypology trainId) = getTypologyOf trainId
evalCmd (Reserve command) = confirmCommand command
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