patch 8.2.2693: Vim9: locked script variable can be changed Commit: https://github.com/vim/vim/commit/dcf29ac87f4d7a62c503ba6de0d92c7779446bf2 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Apr 2 14:44:02 2021 +0200 patch 8.2.2693: Vim9: locked script variable can be changed Problem: Vim9: locked script variable can be changed. Solution: Check legacy script variable for being locked. (issue https://github.com/vim/vim/issues/8031)

--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -1942,6 +1942,9 @@ call_def_function(
 			store_var(name, STACK_TV_BOT(0));
 		    else
 		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			if (var_check_permission(di, name) == FAIL)
+			    goto on_error;
 			clear_tv(&di->di_tv);
 			di->di_tv = *STACK_TV_BOT(0);
 		    }