oh dear

mscorlib/System/IFormattable.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System
+{
+	/// <summary>Provides functionality to format the value of an object into a string representation.</summary>
+	// Token: 0x0200010A RID: 266
+	[Token(Token = "0x200010A")]
+	[ComVisible(true)]
+	public interface IFormattable
+	{
+		/// <summary>Formats the value of the current instance using the specified format.</summary>
+		/// <param name="format">The format to use.  
+		///  -or-  
+		///  A null reference (<see langword="Nothing" /> in Visual Basic) to use the default format defined for the type of the <see cref="T:System.IFormattable" /> implementation.</param>
+		/// <param name="formatProvider">The provider to use to format the value.  
+		///  -or-  
+		///  A null reference (<see langword="Nothing" /> in Visual Basic) to obtain the numeric format information from the current locale setting of the operating system.</param>
+		/// <returns>The value of the current instance in the specified format.</returns>
+		// Token: 0x060009B2 RID: 2482
+		[Token(Token = "0x60009B2")]
+		[Address(Slot = "0")]
+		string ToString(string format, IFormatProvider formatProvider);
+	}
+}