From 74d4434db27828d2a6a6f76211260108c12834a8 Mon Sep 17 00:00:00 2001
From: Steffen Forkmann <sforkmann@gmail.com>
Date: Mon, 24 Nov 2014 15:44:17 +0100
Subject: [PATCH] Make ListModule independent

---
 ExtCore/Collections.List.fs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/ExtCore/Collections.List.fs b/ExtCore/Collections.List.fs
index 5a303b5..9b0e56a 100644
--- a/ExtCore/Collections.List.fs
+++ b/ExtCore/Collections.List.fs
@@ -1,4 +1,4 @@
-(*
+(*
 
 Copyright 2010-2012 TidePowerd Ltd.
 Copyright 2013 Jack Pappas
@@ -23,8 +23,10 @@ module ExtCore.Collections.List
 
 open LanguagePrimitives
 open OptimizedClosures
-open ExtCore
 
+let private checkNonNull name value =
+    if value = Unchecked.defaultof<_> then 
+        raise <| System.ArgumentNullException(name)
 
 /// <summary>A curried "cons" operator.</summary>
 /// <param name="list"></param>
@@ -776,4 +778,3 @@ let distinct (list : 'T list) : 'T list =
 
     // Return the result list.
     result
-