From 9239ce8a90f9c983881216cfece4161a831216d4 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adam@chlipala.net>
Date: Sun, 21 Aug 2011 13:41:57 -0400
Subject: Fix another list unurlification segfault bug; List.foldlMi

---
 lib/ur/list.ur | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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

diff --git a/lib/ur/list.ur b/lib/ur/list.ur
index 35440de2..6a754287 100644
--- a/lib/ur/list.ur
+++ b/lib/ur/list.ur
@@ -255,6 +255,18 @@ fun foldlM [m] (_ : monad m) [a] [b] f =
         foldlM'
     end
 
+fun foldlMi [m] (_ : monad m) [a] [b] f =
+    let
+        fun foldlMi' i acc ls =
+            case ls of
+                [] => return acc
+              | x :: ls =>
+                acc <- f i x acc;
+                foldlMi' (i + 1) acc ls
+    in
+        foldlMi' 0
+    end
+
 fun all [m] f =
     let
         fun all' ls =
-- 
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