dhall-1.4.2: Prelude/Optional/any

{-
Returns `True` if the supplied function returns `True` for a present element and
`False` otherwise

Examples:

```
./any Natural Natural/even ([+2] : Optional Natural) = True

./any Natural Natural/even ([] : Optional Natural) = False
```
-}
let any : ∀(a : Type) → (a → Bool) → Optional a → Bool
    =   λ(a : Type)
    →   λ(f : a → Bool)
    →   λ(xs : Optional a)
    →   Optional/fold a xs Bool f False

in  any