/// <summary>
/// Provides handling logic for abstract Effect awaiters.
/// </summary>
/// <typeparam name="TResult">The result type of the abstract effect.</typeparam>
/// <param name="awaiter">The effect awaiter to be completed with a value.</param>
/// <returns>A task waiting on the asynchronous handler.</returns>
/// <remarks>
/// Typically a pattern match against subtypes of <see cref="Effect{TResult}"/>
/// that are recognized by the particular effect handler implementation.
/// </remarks>
public abstract ValueTask Handle <TResult>(EffectAwaiter <TResult> awaiter);
/// <summary>
/// An effect handler that always throws.
/// </summary>
/// <exception cref="NotSupportedException" />
public override ValueTask Handle <TResult>(EffectAwaiter <TResult> awaiter)
{
throw new NotSupportedException("Abstract effects not supported by this handler.");
}