# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1583596806 -3600
# Node ID fe827d6267c226320154ec36b035fa52ce90904e
# Parent  2f6e8d14ad36d803109f8643cf26f673b9aeb259
patch 8.2.0361: internal error when using "0" for a callback

Commit: https://github.com/vim/vim/commit/14e57909e662a43a42438e2701654af48af49b03
Author: Bram Moolenaar <Bram@vim.org>
Date:   Sat Mar 7 16:59:25 2020 +0100

    patch 8.2.0361: internal error when using "0" for a callback

    Problem:    Internal error when using "0" for a callback.
    Solution:   Give a normal error. (closes https://github.com/vim/vim/issues/5743)

diff --git a/src/evalvars.c b/src/evalvars.c
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3643,7 +3643,8 @@ f_setbufvar(typval_T *argvars, typval_T 
     callback_T
 get_callback(typval_T *arg)
 {
-    callback_T res;
+    callback_T  res;
+    int		r = OK;
 
     res.cb_free_name = FALSE;
     if (arg->v_type == VAR_PARTIAL && arg->vval.v_partial != NULL)
@@ -3655,17 +3656,21 @@ get_callback(typval_T *arg)
     else
     {
 	res.cb_partial = NULL;
-	if (arg->v_type == VAR_FUNC || arg->v_type == VAR_STRING)
+	if (arg->v_type == VAR_STRING && arg->vval.v_string != NULL
+					       && isdigit(*arg->vval.v_string))
+	    r = FAIL;
+	else if (arg->v_type == VAR_FUNC || arg->v_type == VAR_STRING)
 	{
 	    // Note that we don't make a copy of the string.
 	    res.cb_name = arg->vval.v_string;
 	    func_ref(res.cb_name);
 	}
 	else if (arg->v_type == VAR_NUMBER && arg->vval.v_number == 0)
-	{
 	    res.cb_name = (char_u *)"";
-	}
 	else
+	    r = FAIL;
+
+	if (r == FAIL)
 	{
 	    emsg(_("E921: Invalid callback argument"));
 	    res.cb_name = NULL;
diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -422,4 +422,8 @@ func Test_timer_garbage_collect()
   call timer_stop(timer)
 endfunc
 
+func Test_timer_invalid_callback()
+  call assert_fails('call timer_start(0, "0")', 'E921')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
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 */
 /**/
+    361,
+/**/
     360,
 /**/
     359,