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fun sum [fs ::: {Unit}] (fl : folder fs) (x : $(mapU int fs)) =
@foldUR [int] [fn _ => int]
(fn [nm :: Name] [rest :: {Unit}] [[nm] ~ rest] n acc => n + acc)
0 fl x
fun main () = return <xml><body>
{[sum {}]}<br/>
{[sum {A = 0, B = 1}]}<br/>
{[sum {C = 2, D = 3, E = 4}]}
</body></xml>
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