oh dear

mscorlib/System/Runtime/InteropServices/OptionalAttribute.cs

@@ -0,0 +1,21 @@
+using System;
+using Cpp2IlInjected;
+
+namespace System.Runtime.InteropServices
+{
+	/// <summary>Indicates that a parameter is optional.</summary>
+	// Token: 0x02000574 RID: 1396
+	[Token(Token = "0x2000574")]
+	[AttributeUsage(AttributeTargets.Parameter)]
+	[ComVisible(true)]
+	public sealed class OptionalAttribute : Attribute
+	{
+		/// <summary>Initializes a new instance of the <see langword="OptionalAttribute" /> class with default values.</summary>
+		// Token: 0x06002AA1 RID: 10913 RVA: 0x00002050 File Offset: 0x00000250
+		[Token(Token = "0x6002AA1")]
+		[Address(RVA = "0x4093D0", Offset = "0x4081D0", VA = "0x1804093D0")]
+		public OptionalAttribute()
+		{
+		}
+	}
+}