oh dear

mscorlib/System/Predicate.cs

@@ -0,0 +1,15 @@
+using System;
+using Cpp2IlInjected;
+
+namespace System
+{
+	/// <summary>Represents the method that defines a set of criteria and determines whether the specified object meets those criteria.</summary>
+	/// <param name="obj">The object to compare against the criteria defined within the method represented by this delegate.</param>
+	/// <typeparam name="T">The type of the object to compare.</typeparam>
+	/// <returns>
+	///   <see langword="true" /> if <paramref name="obj" /> meets the criteria defined within the method represented by this delegate; otherwise, <see langword="false" />.</returns>
+	// Token: 0x020000AB RID: 171
+	// (Invoke) Token: 0x060004D6 RID: 1238
+	[Token(Token = "0x20000AB")]
+	public delegate bool Predicate<in T>(T obj);
+}