From 7865cb372d95c42542d59cbcf83ba541b0ab3f8a Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Tue, 24 Feb 2009 12:01:24 -0500
Subject: Switch to TDisjoint from CDisjoint; still need to implement
 obligation generation at EDisjoint uses

---
 lib/ur/top.ur  | 12 ++++++++++++
 lib/ur/top.urs |  2 ++
 2 files changed, 14 insertions(+)

(limited to 'lib/ur')

diff --git a/lib/ur/top.ur b/lib/ur/top.ur
index 5d2ae606..79d30354 100644
--- a/lib/ur/top.ur
+++ b/lib/ur/top.ur
@@ -17,6 +17,18 @@ structure Folder = struct
              (f : nm :: Name -> v :: K -> r :: {K} -> tf r
                   -> fn [[nm] ~ r] => tf ([nm = v] ++ r))
              (i : tf []) = f [nm] [v] [r] (fold [tf] f i)
+
+    fun concat K (r1 ::: {K}) (r2 ::: {K}) [r1 ~ r2]
+        (f1 : folder r1) (f2 : folder r2)
+        (tf :: {K} -> Type)
+        (f : nm :: Name -> v :: K -> r :: {K} -> tf r
+             -> fn [[nm] ~ r] => tf ([nm = v] ++ r))
+        (i : tf []) =
+        f1 [fn r1' [r1' ~ r2] => tf (r1' ++ r2)] 0
+           (*(fn (nm :: Name) (v :: K) (r1' :: {K}) (acc : fn [r1' ~ r2] => tf (r1' ++ r2))
+                            [[nm] ~ r1'] [[nm = v] ++ r1' ~ r2] =>
+               f [nm] [v] [r1' ++ r2] acc)
+           (f2 [tf] f i)*)
 end
 
 
diff --git a/lib/ur/top.urs b/lib/ur/top.urs
index d4cd34f4..563f6afd 100644
--- a/lib/ur/top.urs
+++ b/lib/ur/top.urs
@@ -10,6 +10,8 @@ structure Folder : sig
     val nil : K --> folder (([]) :: {K})
     val cons : K --> r ::: {K} -> nm :: Name -> v :: K
                -> fn [[nm] ~ r] => folder r -> folder ([nm = v] ++ r)
+    val concat : K --> r1 ::: {K} -> r2 ::: {K}
+                 -> fn [r1 ~ r2] => folder r1 -> folder r2 -> folder (r1 ++ r2)
 end
 
 
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