oh dear

mscorlib/System/Threading/WaitOrTimerCallback.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System.Threading
+{
+	/// <summary>Represents a method to be called when a <see cref="T:System.Threading.WaitHandle" /> is signaled or times out.</summary>
+	/// <param name="state">An object containing information to be used by the callback method each time it executes.</param>
+	/// <param name="timedOut">
+	///   <see langword="true" /> if the <see cref="T:System.Threading.WaitHandle" /> timed out; <see langword="false" /> if it was signaled.</param>
+	// Token: 0x02000336 RID: 822
+	// (Invoke) Token: 0x06001DE8 RID: 7656
+	[Token(Token = "0x2000336")]
+	[ComVisible(true)]
+	public delegate void WaitOrTimerCallback(object state, bool timedOut);
+}