void msg_location_remove_columns (struct msg_location *);
void msg_location_merge (struct msg_location **, const struct msg_location *);
+struct msg_location *msg_location_merged (const struct msg_location *,
+ const struct msg_location *);
bool msg_location_is_empty (const struct msg_location *);
void msg_location_format (const struct msg_location *, struct string *);