Agda-2.6.1.1: A dependently typed functional programming language and proof assistant
Safe HaskellSafe-Inferred
LanguageHaskell2010

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

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.