void SetTimedOut() =>
_taskSource.TrySetException(new TimeoutException($"Timed out after expecting event of type {_eventType} for {_timeout.TimeSpan}"));
public static bool TrySetFromTask <T>(this TaskSource <T> target, Task <T> source, CancellationToken candidateToken)
=> source.IsCanceled
? target.TrySetCanceled(candidateToken.IsCancellationRequested ? candidateToken : CancellationToken.None)
: source.Exception != null
? target.TrySetException(source.Exception)
: target.TrySetResult(source.Result);
