public static Task <T> FromCanceled <T>(this CancellationToken cancellationToken)
{
MiscellaneousUtils.Assert(cancellationToken.IsCancellationRequested);
#pragma warning disable CS8653 // A default expression introduces a null value for a type parameter.
return(new Task <T>(() => default, cancellationToken));
// From 4.6 on we could use Task.FromCanceled(), but we need an equivalent for
// previous frameworks.
public static Task FromCanceled(this CancellationToken cancellationToken)
{
MiscellaneousUtils.Assert(cancellationToken.IsCancellationRequested);
return(new Task(() => {}, cancellationToken));
}