oh dear

mscorlib/System/Collections/IHashCodeProvider.cs

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+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System.Collections
+{
+	/// <summary>Supplies a hash code for an object, using a custom hash function.</summary>
+	// Token: 0x020005BC RID: 1468
+	[Token(Token = "0x20005BC")]
+	[Obsolete]
+	[Obsolete("Please use IEqualityComparer instead.")]
+	[ComVisible(true)]
+	public interface IHashCodeProvider
+	{
+		/// <summary>Returns a hash code for the specified object.</summary>
+		/// <param name="obj">The <see cref="T:System.Object" /> for which a hash code is to be returned.</param>
+		/// <returns>A hash code for the specified object.</returns>
+		/// <exception cref="T:System.ArgumentNullException">The type of <paramref name="obj" /> is a reference type and <paramref name="obj" /> is <see langword="null" />.</exception>
+		// Token: 0x06002C7C RID: 11388
+		[Token(Token = "0x6002C7C")]
+		[Address(Slot = "0")]
+		int GetHashCode(object obj);
+	}
+}