patch 8.2.4295: Vim9: concatenating two lists may result in wrong type Commit: https://github.com/vim/vim/commit/46950b225fab2e10245a04952b2c238e0362e1b7 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Feb 4 11:36:51 2022 +0000 patch 8.2.4295: Vim9: concatenating two lists may result in wrong type Problem: Vim9: concatenating two lists may result in wrong type. Solution: Remove the type instead of using list<any>. (closes https://github.com/vim/vim/issues/9692)

--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1500,6 +1500,12 @@ def Test_expr5_list_add()
       assert_equal([[1, 2]], lln)
   END
   v9.CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      var ln: list<number> = [0]
+      var lln: list<list<number>> = [ln + []]
+  END
+  v9.CheckDefAndScriptSuccess(lines)
 enddef
 
 " test multiply, divide, modulo