From d07c91bf275874a5f6f13af5f338def78eea7ae0 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Tue, 8 Sep 2009 10:18:19 -0400
Subject: dragList almost kinda works

---
 lib/ur/list.ur | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib/ur/list.ur')

diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index 3d4134ea..9e2550ca 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -44,6 +44,16 @@ fun foldlAbort [a] [b] f =
         foldlAbort'
     end
 
+val length = fn [a] =>
+                let
+                    fun length' acc (ls : list a) =
+                        case ls of
+                            [] => acc
+                          | _ :: ls => length' (acc + 1) ls
+                in
+                    length' 0
+                end
+
 val rev = fn [a] =>
              let
                  fun rev' acc (ls : list a) =
-- 
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