ListShop skeleton

1 files changed, 15 insertions, 0 deletions

diff --git a/demo/list.ur b/demo/list.ur
new file mode 100644
index 00000000..c2dfce22
--- /dev/null
+++ b/demo/list.ur
@@ -0,0 +1,15 @@
+datatype list t = Nil | Cons of t * list t
+
+fun length' (t ::: Type) (ls : list t) (acc : int) =
+    case ls of
+        Nil => acc
+      | Cons (_, ls') => length' ls' (acc + 1)
+
+fun length (t ::: Type) (ls : list t) = length' ls 0
+
+fun rev' (t ::: Type) (ls : list t) (acc : list t) =
+    case ls of
+        Nil => acc
+      | Cons (x, ls') => rev' ls' (Cons (x, acc))
+
+fun rev (t ::: Type) (ls : list t) = rev' ls Nil