patch 8.2.4634: Vim9: cannot initialize a variable to null_list Commit: https://github.com/vim/vim/commit/ec15b1cfdc5faadb529dedda58adf7fc98c839ed Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 27 16:29:53 2022 +0100 patch 8.2.4634: Vim9: cannot initialize a variable to null_list Problem: Vim9: cannot initialize a variable to null_list. Solution: Give negative count to NEWLIST. (closes https://github.com/vim/vim/issues/10027) Also fix inconsistencies in comparing with null values.

--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -122,13 +122,13 @@ def Test_add_blob()
   END
   v9.CheckDefExecFailure(lines, 'E1131:', 2)
 
-  # Getting variable with NULL blob allocates a new blob at script level
+  # Getting variable with NULL blob fails
   lines =<< trim END
       vim9script
       var b: blob = test_null_blob()
       add(b, 123)
   END
-  v9.CheckScriptSuccess(lines)
+  v9.CheckScriptFailure(lines, 'E1131:', 3)
 enddef
 
 def Test_add_list()