1 files changed, 9 insertions, 0 deletions
diff --git a/demo/sum.ur b/demo/sum.ur
new file mode 100644
index 00000000..96a45891
--- /dev/null
+++ b/demo/sum.ur
@@ -0,0 +1,9 @@
+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 <xml><body>
+  {[sum [[A, B]] {A = 0, B = 1}]}<br/>
+  {[sum [[C, D, E]] {C = 2, D = 3, E = 4}]}
+</body></xml>