namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Delegate, AllowMultiple = false, Inherited = false)]
    public sealed class AsyncMethodBuilderAttribute : Attribute
    {
        public AsyncMethodBuilderAttribute(Type builderType);
    }
}