datatype option a = None | Some of a
val none_Hi : option string = None
val some_Hi = Some "Hi"
val none_some_Hi : option (option string) = None
val some_some_Hi = Some some_Hi
val show = fn x => case x of None => "None" | Some x => x
val show2 = fn x => case x of None => "None'" | Some x => show x
val page = fn x => return
{cdata (show x)}
val page2 = fn x => return
{cdata (show2 x)}
val main : unit -> transaction page = fn () => return
None1
Some1
None2
Some2