1 files changed, 13 insertions, 0 deletions
diff --git a/tests/listGroupBy.ur b/tests/listGroupBy.ur
new file mode 100644
index 00000000..c2419ce1
--- /dev/null
+++ b/tests/listGroupBy.ur
@@ -0,0 +1,13 @@
+fun lister () = List.tabulateM (fn _ => n <- rand; return (n % 100)) 8
+
+fun main () : transaction page =
+    inp <- source [];
+    return <xml><body>
+      <button value="Compute" onclick={fn _ =>
+                                          ls <- rpc (lister ());
+                                          set inp ls}/>
+
+      <dyn signal={inp <- signal inp; return (txt inp)}/>
+      -&gt;
+      <dyn signal={inp <- signal inp; return (txt (List.groupBy (fn n m => n % 2 = m % 2) inp))}/>
+    </body></xml>