# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1587575704 -7200
# Node ID 831b1ea43020a75389ab115482b1435fe6aca020
# Parent  4d065d193bf691cadee9b5d679a2f34033a23a5c
patch 8.2.0618: echoing a null list results in no output

Commit: https://github.com/vim/vim/commit/db950e4c0318c084c31bc7b50665284f4a47c285
Author: Bram Moolenaar <Bram@vim.org>
Date:   Wed Apr 22 19:13:19 2020 +0200

    patch 8.2.0618: echoing a null list results in no output

    Problem:    Echoing a null list results in no output. (Yegappan Lakshmanan)
    Solution:   Return "[]" instead of NULL in echo_string_core().

diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -4528,8 +4528,9 @@ echo_string_core(
 	case VAR_LIST:
 	    if (tv->vval.v_list == NULL)
 	    {
+		// NULL list is equivalent to empty list.
 		*tofree = NULL;
-		r = NULL;
+		r = (char_u *)"[]";
 	    }
 	    else if (copyID != 0 && tv->vval.v_list->lv_copyID == copyID
 		    && tv->vval.v_list->lv_len > 0)
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -76,6 +76,7 @@ func Test_echomsg()
   call assert_equal("\n12345", execute(':echomsg 12345'))
   call assert_equal("\n[]", execute(':echomsg []'))
   call assert_equal("\n[1, 2, 3]", execute(':echomsg [1, 2, 3]'))
+  call assert_equal("\n[1, 2, []]", execute(':echomsg [1, 2, test_null_list()]'))
   call assert_equal("\n{}", execute(':echomsg {}'))
   call assert_equal("\n{'a': 1, 'b': 2}", execute(':echomsg {"a": 1, "b": 2}'))
   if has('float')
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    618,
+/**/
     617,
 /**/
     616,