function name, plus a user-specific message. */
#define PANIC(...) debug_panic (__FILE__, __LINE__, __func__, __VA_ARGS__)
-void debug_enable (char *classes);
void debug_panic (const char *file, int line, const char *function,
const char *message, ...) PRINTF_FORMAT (4, 5) NO_RETURN;
void debug_backtrace (void);