namespace System.Runtime.CompilerServices { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false)] public sealed class CompilerFeatureRequiredAttribute : Attribute { public const string RefStructs = "RefStructs"; public const string RequiredMembers = "RequiredMembers"; public string FeatureName { get; } public bool IsOptional { get; set; } public CompilerFeatureRequiredAttribute(string featureName) { FeatureName = featureName; } } }