# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1586461503 -7200
# Node ID c0eb073378e797a17d924d205b41f8b58084e1e2
# Parent  98fb36b068e4f57ed7b3ce120e9a4f19f9b6924f
patch 8.2.0539: comparing two NULL list fails

Commit: https://github.com/vim/vim/commit/7b293c730b07d1586688e622b8d9cbbb4a52379b
Author: Bram Moolenaar <Bram@vim.org>
Date:   Thu Apr 9 21:33:22 2020 +0200

    patch 8.2.0539: comparing two NULL list fails

    Problem:    Comparing two NULL list fails.
    Solution:   Change the order of comparing two lists.

diff --git a/src/list.c b/src/list.c
--- a/src/list.c
+++ b/src/list.c
@@ -368,12 +368,15 @@ list_equal(
 {
     listitem_T	*item1, *item2;
 
-    if (l1 == NULL || l2 == NULL)
-	return FALSE;
     if (l1 == l2)
 	return TRUE;
     if (list_len(l1) != list_len(l2))
 	return FALSE;
+    if (list_len(l1) == 0)
+	// empty and NULL list are considered equal
+	return TRUE;
+    if (l1 == NULL || l2 == NULL)
+	return FALSE;
 
     range_list_materialize(l1);
     range_list_materialize(l2);
diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -36,6 +36,9 @@ func Test_assert_equal()
   call assert_equal(0, assert_equal(4, n))
   let l = [1, 2, 3]
   call assert_equal(0, assert_equal([1, 2, 3], l))
+  call assert_equal(test_null_list(), test_null_list())
+  call assert_equal(test_null_list(), [])
+  call assert_equal([], test_null_list())
 
   let s = 'foo'
   call assert_equal(1, assert_equal('bar', s))
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    539,
+/**/
     538,
 /**/
     537,