NullableAttributes.cs

// 提供給 .NET 6 使用的 nullable 屬性 polyfill
// BepInEx.Unity.IL2CPP.dll 內含 NullableContextAttribute 參考,但 .NET 6.0.7 runtime 沒有
namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Method | AttributeTargets.Interface | AttributeTargets.Module, AllowMultiple = false, Inherited = false)]
    internal sealed class NullableContextAttribute : Attribute
    {
        public byte Flag;
        public NullableContextAttribute(byte flag) { Flag = flag; }
    }

    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Parameter | AttributeTargets.ReturnValue | AttributeTargets.Method | AttributeTargets.Interface | AttributeTargets.Module, AllowMultiple = false, Inherited = false)]
    internal sealed class NullableAttribute : Attribute
    {
        public readonly byte[] NullableFlags;
        public NullableAttribute(byte flag) { NullableFlags = new byte[] { flag }; }
        public NullableAttribute(byte[] flags) { NullableFlags = flags; }
    }
}