public sealed class SchedulerTimeoutException : Exception, ISerializable, _Exception
Exception designed not to be caught by tests (which may deliberately expect a timeout of another kind, for example).
This exception indicates that the scheduler timed out either in simulated time (e.g. a busy loop with a condition
never being satisfied) or in wall time (e.g. user code was waiting for a task which was never going to complete, due
to a deadlock).