nothing -package:xmonad-contrib

Analogous to Nothing and equivalent to mzero
A prism on the Nothing element of a Maybe.
NULL value.
nothing :: Prism' (Maybe a) ()
A prism on the Nothing element of a Maybe.
Match nothing, universal rejector.
>>> prove $ \(s :: SString) -> sNot (s `match` nothing)
Q.E.D.
Record with polymorphic phantom type of SQL null value. Semantics of comparing is unsafe.
Assert that some value is Nothing.
A predicate checking if the input is Nothing
>>> Nothing `shouldSatisfy` P.nothing
Nothing bound to the Maybe Int type encoded as an Expr. This is an alias to nothingInt.
Traversal on the Nothing element of a Maybe.
nothing_ :: Traversal' (Maybe a) ()
Traversal on the Nothing element of a Maybe.
Gets the nothing action. This is an action that does nothing and where activating it always fails.
Return either a 'QExpr (Maybe x)' representing Nothing or a nullable Table or PrimaryKey filled with Nothing.
>>> runTP nothingBetweenZeroAndOne
Lemma: nothingBetweenZeroAndOne         Q.E.D.
[Proven] nothingBetweenZeroAndOne :: Ɐm ∷ Nat → Bool
The Opaleye analogue of Nothing.