Why does AsFailedTask use TaskCompletionSource instead of Task FromException

[zms9110750]

	public static Task<A> AsFailedTask<A>(this Exception ex)
	{
		return Task.FromException<A>(ex); 
	}

[louthy]

I don't remember entirely, but I think that FromException didn't exist in early .netcore/netstandard.

[zms9110750]

https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task.fromexception?view=net-8.0
Core 1.0 , Framework 4.6 , Standard 1.3.

[zms9110750]

TaskCompletionSource was first introduced on. net5.
https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.taskcompletionsource?view=net-8.0