in lib/src/default.dart [41:50]
T withClock<T>(Clock clock, T Function() callback,
{@deprecated bool isFinal = false}) {
if ((Zone.current[_isFinalKey] ?? false) == true) {
throw StateError(
'Cannot call withClock() within a call to withClock(isFinal = true).');
}
return runZoned(callback,
zoneValues: {_clockKey: clock, _isFinalKey: isFinal});
}