namespace System.Runtime.CompilerServices { [System.AttributeUsage( AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Struct, AllowMultiple = false, Inherited = false)] public sealed class NullableContextAttribute : Attribute { public readonly byte Flag; public NullableContextAttribute(byte flag) { Flag = flag; } } }