isc_assertiontype_t
default_callback(const char *, int, isc_assertiontype_t, const char *);
isc_assertion_failed(const char *file, int line, isc_assertiontype_t type,
isc_assertion_typetotext(isc_assertiontype_t type) {
default_callback(const char *file, int line, isc_assertiontype_t type,
typedef void (*isc_assertioncallback_t)(const char *, int, isc_assertiontype_t,
__dead void isc_assertion_failed(const char *, int, isc_assertiontype_t,
isc_assertion_typetotext(isc_assertiontype_t type);