patch 9.0.1074: class members are not supported yet

Problem:    Class members are not supported yet.
Solution:   Add initial support for class members.
diff --git a/src/vim9cmds.c b/src/vim9cmds.c
index ecf31dc..4fbae4f 100644
--- a/src/vim9cmds.c
+++ b/src/vim9cmds.c
@@ -1013,7 +1013,7 @@
 	    if (dest != dest_local)
 	    {
 		if (generate_store_var(cctx, dest, opt_flags, vimvaridx,
-						     0, 0, type, name) == FAIL)
+						     type, name, NULL) == FAIL)
 		    goto failed;
 	    }
 	    else if (varlen == 1 && *arg == '_')