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fun isNil (t ::: Type) (ls : list t) =
case ls of
Nil => True
| _ => False
fun delist (ls : list string) : xbody =
case ls of
Nil => <xml>Nil</xml>
| Cons (h, t) => <xml>{[h]} :: {delist t}</xml>
fun main () = return <xml><body>
{[isNil (Nil : list bool)]},
{[isNil (Cons (1, Nil))]},
{[isNil (Cons ("A", Cons ("B", Nil)))]}
<p>{delist (Cons ("X", Cons ("Y", Cons ("Z", Nil))))}</p>
</body></xml>
|
