oh dear

mscorlib/System/IAsyncResult.cs

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+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+using Cpp2IlInjected;
+
+namespace System
+{
+	/// <summary>Represents the status of an asynchronous operation.</summary>
+	// Token: 0x02000101 RID: 257
+	[Token(Token = "0x2000101")]
+	[ComVisible(true)]
+	public interface IAsyncResult
+	{
+		/// <summary>Gets a value that indicates whether the asynchronous operation has completed.</summary>
+		/// <returns>
+		///   <see langword="true" /> if the operation is complete; otherwise, <see langword="false" />.</returns>
+		// Token: 0x170000CC RID: 204
+		// (get) Token: 0x06000996 RID: 2454
+		[Token(Token = "0x170000CC")]
+		bool IsCompleted
+		{
+			[Token(Token = "0x6000996")]
+			[Address(Slot = "0")]
+			get;
+		}
+
+		/// <summary>Gets a <see cref="T:System.Threading.WaitHandle" /> that is used to wait for an asynchronous operation to complete.</summary>
+		/// <returns>A <see cref="T:System.Threading.WaitHandle" /> that is used to wait for an asynchronous operation to complete.</returns>
+		// Token: 0x170000CD RID: 205
+		// (get) Token: 0x06000997 RID: 2455
+		[Token(Token = "0x170000CD")]
+		WaitHandle AsyncWaitHandle
+		{
+			[Token(Token = "0x6000997")]
+			[Address(Slot = "1")]
+			get;
+		}
+
+		/// <summary>Gets a user-defined object that qualifies or contains information about an asynchronous operation.</summary>
+		/// <returns>A user-defined object that qualifies or contains information about an asynchronous operation.</returns>
+		// Token: 0x170000CE RID: 206
+		// (get) Token: 0x06000998 RID: 2456
+		[Token(Token = "0x170000CE")]
+		object AsyncState
+		{
+			[Token(Token = "0x6000998")]
+			[Address(Slot = "2")]
+			get;
+		}
+
+		/// <summary>Gets a value that indicates whether the asynchronous operation completed synchronously.</summary>
+		/// <returns>
+		///   <see langword="true" /> if the asynchronous operation completed synchronously; otherwise, <see langword="false" />.</returns>
+		// Token: 0x170000CF RID: 207
+		// (get) Token: 0x06000999 RID: 2457
+		[Token(Token = "0x170000CF")]
+		bool CompletedSynchronously
+		{
+			[Token(Token = "0x6000999")]
+			[Address(Slot = "3")]
+			get;
+		}
+	}
+}