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fun sum (t ::: Type) (_ : num t) (fs ::: {Unit}) (fl : folder fs) (x : $(mapUT t fs)) =
foldUR [t] [fn _ => t]
(fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc)
zero [fs] fl x
fun main () = return <xml><body>
{[sum (Folder.cons [#A] [()] ! (Folder.cons [#B] [()] ! Folder.nil)) {A = 0, B = 1}]}<br/>
{[sum (Folder.cons [#D] [()] ! (Folder.cons [#C] [()] ! (Folder.cons [#E] [()] ! Folder.nil))) {C = 2.1, D = 3.2, E = 4.3}]}
</body></xml>
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