patch 9.0.1060: private and public object members are not implemented yet

problem:    Private and public object members are not implemented yet.
Solution:   Implement private and public object members.
diff --git a/src/errors.h b/src/errors.h
index 2cf29cc..6299ccd 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3378,4 +3378,14 @@
 	INIT(= N_("E1329: Cannot get object member type from initializer: %s"));
 EXTERN char e_invalid_type_for_object_member_str[]
 	INIT(= N_("E1330: Invalid type for object member: %s"));
+EXTERN char e_public_must_be_followed_by_this[]
+	INIT(= N_("E1331: Public must be followed by \"this\""));
+EXTERN char e_public_object_member_name_cannot_start_with_underscore_str[]
+	INIT(= N_("E1332: Public object member name cannot start with underscore: %s"));
+EXTERN char e_cannot_access_private_object_member_str[]
+	INIT(= N_("E1333: Cannot access private object member: %s"));
+EXTERN char e_object_member_not_found_str[]
+	INIT(= N_("E1334: Object member not found: %s"));
+EXTERN char e_object_member_is_not_writable_str[]
+	INIT(= N_("E1335: Object member is not writable: %s"));
 #endif