IEvaluatableObservable<T>
                
                
                
                
using System.
Runtime.
CompilerServices;
namespace System.
Reactive
{
    [
System.
Runtime.
CompilerServices.
NullableContext(
1)]
    
internal interface IEvaluatableObservable<[
System.
Runtime.
CompilerServices.
Nullable(
2)] 
out T>
    {
        
IObservable<
T> 
Eval();
    }
}