patch 8.2.2670: Vim9: error for append(0, text) Commit: https://github.com/vim/vim/commit/b2ac7d0663ef31a335c50c6afca042ed9ace5059 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 28 15:46:16 2021 +0200 patch 8.2.2670: Vim9: error for append(0, text) Problem: Vim9: error for append(0, text). Solution: Check for negative number. (closes https://github.com/vim/vim/issues/8022)

--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -123,6 +123,10 @@ def Test_append()
   var res2: bool = append(3, 'two')
   assert_equal(false, res2)
   assert_equal(['0', 'one', '1', 'two', '2'], getline(1, 6))
+
+  append(0, 'zero')
+  assert_equal('zero', getline(1))
+  bwipe!
 enddef
 
 def Test_balloon_show()