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| data ReservationExpr a where | |
| SearchTrain :: DateTime -> ReservationExpr [TrainId] | |
| GetTypology :: TrainId -> ReservationExpr (Maybe TrainTypology) | |
| Reserve :: Reservation -> ReservationExpr (Maybe Reservation) | |
| Log :: String -> ReservationExpr () | |
| Pure :: ta -> ReservationExpr ta | |
| Bind :: ReservationExpr ta -> (ta -> ReservationExpr tb) -> ReservationExpr tb |
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