Set *signal;
} ExitStatusSet;
-const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level);
+const char* exit_status_to_string(ExitStatus status, ExitStatusLevel level) _const_;
bool is_clean_exit(int code, int status, ExitStatusSet *success_status);
bool is_clean_exit_lsb(int code, int status, ExitStatusSet *success_status);