Safe Haskell	None
Language	Haskell2010

Agda.Utils.Empty

Description

An empty type with some useful instances.

Synopsis

Documentation

data Empty Source #

Instances

Instances details

Eq Empty Source #
Instance details Defined in Agda.Utils.Empty Methods (==) :: Empty -> Empty -> Bool # (/=) :: Empty -> Empty -> Bool #
Data Empty Source #
Instance details Defined in Agda.Utils.Empty Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Empty -> c Empty # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Empty # toConstr :: Empty -> Constr # dataTypeOf :: Empty -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Empty) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Empty) # gmapT :: (forall b. Data b => b -> b) -> Empty -> Empty # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Empty -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Empty -> r # gmapQ :: (forall d. Data d => d -> u) -> Empty -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Empty -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Empty -> m Empty # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Empty -> m Empty # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Empty -> m Empty #
Ord Empty Source #
Instance details Defined in Agda.Utils.Empty Methods compare :: Empty -> Empty -> Ordering # (<) :: Empty -> Empty -> Bool # (<=) :: Empty -> Empty -> Bool # (>) :: Empty -> Empty -> Bool # (>=) :: Empty -> Empty -> Bool # max :: Empty -> Empty -> Empty # min :: Empty -> Empty -> Empty #
Show Empty Source #
Instance details Defined in Agda.Utils.Empty Methods showsPrec :: Int -> Empty -> ShowS # show :: Empty -> String # showList :: [Empty] -> ShowS #
EmbPrj Empty Source #
Instance details Defined in Agda.TypeChecking.Serialise.Instances.Common Methods icode :: Empty -> S Int32 Source # icod_ :: Empty -> S Int32 Source # value :: Int32 -> R Empty Source #

absurd :: Empty -> a Source #

toImpossible :: Empty -> IO Impossible Source #

toImpossible e extracts the Impossible value raised via IMPOSSIBLE to create the element e of type Empty. It proceeds by evaluating e to weak head normal form and catching the exception. We are forced to wrap things in a Maybe because of catchImpossible's type.