dhall-1.3.0: Prelude/List/head

{-
Retrieve the first element of the list

Examples:

```
./head Integer ([0, 1, 2] : List Integer) = [0] : Optional Integer

./head Integer ([] : List Integer) = [] : Optional Integer
```
-}
let head : ∀(a : Type) → List a → Optional a
    =   List/head

in  head