Quite confusing error message CS0282

Version Used: Microsoft (R) Visual C# Compiler version 2.8.2.62916 (2ad4aabc)

Steps to Reproduce:

1. Compile following code

using System;
using System.Runtime.InteropServices;

partial class Exception2
{
	protected event Action a;
}

[StructLayout (LayoutKind.Sequential)]
partial class Exception2
{
	protected event Action b;
}

Expected Behavior:

A warning which makes sense

Actual Behavior:

warning CS0282: There is no defined ordering between fields in multiple declarations of partial struct 'Exception2'. To specify an ordering, all instance fields must be in the same declaration.

• there is no struct 'Exception2' (it's a class)
• referring to events underlying implementation fields is also confusing