enum msg_category category; /* Message category. */
enum msg_severity severity; /* Message severity. */
char *file_name; /* Name of file containing error, or NULL. */
+ char *command_name; /* Name of erroneous command, or NULL. */
int first_line; /* 1-based line number, or 0 if none. */
int last_line; /* 1-based exclusive last line (0=none). */
int first_column; /* 1-based first column, or 0 if none. */
/* Working with messages. */
struct msg *msg_dup (const struct msg *);
void msg_destroy(struct msg *);
-char *msg_to_string (const struct msg *, const char *command_name);
+char *msg_to_string (const struct msg *);
/* Emitting messages. */
void vmsg (enum msg_class class, const char *format, va_list args)