oh dear

mscorlib/System/Collections/IStructuralComparable.cs

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+using System;
+using Cpp2IlInjected;
+
+namespace System.Collections
+{
+	/// <summary>Supports the structural comparison of collection objects.</summary>
+	// Token: 0x020005BE RID: 1470
+	[Token(Token = "0x20005BE")]
+	public interface IStructuralComparable
+	{
+		/// <summary>Determines whether the current collection object precedes, occurs in the same position as, or follows another object in the sort order.</summary>
+		/// <param name="other">The object to compare with the current instance.</param>
+		/// <param name="comparer">An object that compares members of the current collection object with the corresponding members of <paramref name="other" />.</param>
+		/// <returns>A signed integer that indicates the relationship of the current collection object to <paramref name="other" /> in the sort order: - If less than 0, the current instance precedes <paramref name="other" />. - If 0, the current instance and <paramref name="other" /> are equal. - If greater than 0, the current instance follows <paramref name="other" />.  
+		///   Return value  
+		///
+		///   Description  
+		///
+		///   -1  
+		///
+		///   The current instance precedes <paramref name="other" />.  
+		///
+		///   0  
+		///
+		///   The current instance and <paramref name="other" /> are equal.  
+		///
+		///   1  
+		///
+		///   The current instance follows <paramref name="other" />.</returns>
+		/// <exception cref="T:System.ArgumentException">This instance and <paramref name="other" /> are not the same type.</exception>
+		// Token: 0x06002C88 RID: 11400
+		[Token(Token = "0x6002C88")]
+		[Address(Slot = "0")]
+		int CompareTo(object other, IComparer comparer);
+	}
+}