oh dear

mscorlib/System/Runtime/InteropServices/UnmanagedFunctionPointerAttribute.cs

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+using System;
+using Cpp2IlInjected;
+
+namespace System.Runtime.InteropServices
+{
+	/// <summary>Controls the marshaling behavior of a delegate signature passed as an unmanaged function pointer to or from unmanaged code. This class cannot be inherited.</summary>
+	// Token: 0x02000565 RID: 1381
+	[Token(Token = "0x2000565")]
+	[ComVisible(true)]
+	[AttributeUsage(AttributeTargets.Delegate)]
+	public sealed class UnmanagedFunctionPointerAttribute : Attribute
+	{
+		/// <summary>Initializes a new instance of the <see cref="T:System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute" /> class with the specified calling convention.</summary>
+		/// <param name="callingConvention">The specified calling convention.</param>
+		// Token: 0x06002A95 RID: 10901 RVA: 0x00002050 File Offset: 0x00000250
+		[Token(Token = "0x6002A95")]
+		[Address(RVA = "0x4D83A0", Offset = "0x4D71A0", VA = "0x1804D83A0")]
+		public UnmanagedFunctionPointerAttribute(CallingConvention callingConvention)
+		{
+		}
+
+		// Token: 0x040018A8 RID: 6312
+		[FieldOffset(Offset = "0x10")]
+		[Token(Token = "0x40018A8")]
+		private CallingConvention m_callingConvention;
+
+		/// <summary>Indicates how to marshal string parameters to the method, and controls name mangling.</summary>
+		// Token: 0x040018A9 RID: 6313
+		[FieldOffset(Offset = "0x14")]
+		[Token(Token = "0x40018A9")]
+		public CharSet CharSet;
+
+		/// <summary>Enables or disables best-fit mapping behavior when converting Unicode characters to ANSI characters.</summary>
+		// Token: 0x040018AA RID: 6314
+		[FieldOffset(Offset = "0x18")]
+		[Token(Token = "0x40018AA")]
+		public bool BestFitMapping;
+
+		/// <summary>Enables or disables the throwing of an exception on an unmappable Unicode character that is converted to an ANSI "?" character.</summary>
+		// Token: 0x040018AB RID: 6315
+		[FieldOffset(Offset = "0x19")]
+		[Token(Token = "0x40018AB")]
+		public bool ThrowOnUnmappableChar;
+
+		/// <summary>Indicates whether the callee calls the <see langword="SetLastError" /> Win32 API function before returning from the attributed method.</summary>
+		// Token: 0x040018AC RID: 6316
+		[FieldOffset(Offset = "0x1A")]
+		[Token(Token = "0x40018AC")]
+		public bool SetLastError;
+	}
+}