From f20dbafa3e49c35414640e01c3549ad1c802d331 Mon Sep 17 00:00:00 2001
From: filliatr
Date: Fri, 3 Dec 1999 09:09:37 +0000
Subject:  - global_reference traite des variables  - construct_reference, avec
 environnement en argument  - link de Class  - Definition et Check au toplevel

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@193 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 lib/util.ml  | 2 ++
 lib/util.mli | 1 +
 2 files changed, 3 insertions(+)

(limited to 'lib')

diff --git a/lib/util.ml b/lib/util.ml
index e1e524cf4a..b96eca3ae3 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -65,6 +65,8 @@ let stringmap_dom m = Stringmap.fold (fun s _ l -> s::l) m []
 
 (* Lists *)
 
+let list_add_set x l = if List.mem x l then l else x::l
+
 let list_intersect l1 l2 = 
   List.filter (fun x -> List.mem x l2) l1
 
diff --git a/lib/util.mli b/lib/util.mli
index 2060b73758..b26d6a1d7f 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -41,6 +41,7 @@ val stringmap_dom : 'a Stringmap.t -> string list
 
 (*s Lists. *)
 
+val list_add_set : 'a -> 'a list -> 'a list
 val list_intersect : 'a list -> 'a list -> 'a list
 val list_union : 'a list -> 'a list -> 'a list
 val list_unionq : 'a list -> 'a list -> 'a list
-- 
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