fun sum (fs ::: {Unit}) (x : $(mapUT int fs)) = foldUR [int] [fn _ => int] (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] n acc => n + acc) 0 [fs] x fun main () = return {[sum {}]}
{[sum {A = 0, B = 1}]}
{[sum {C = 2, D = 3, E = 4}]}