Proposal: Attribute on auto-properties for backing fields

[zdimension]

Recently, I started writing some game engin that reads some 15 years old file format (Tomb Raider II levels) and these levels are made of structures (look here) that contains arrays. Most are fixed-size.
So I needed to do something like that:

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
public ushort[] SomeArray { get; set; }

It works, but if I replace ushort by a structure, here tr2_colour, I get an error.

public struct tr2_colour
{
    public byte Red;
    public byte Green;
    public byte Blue;
}

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
public tr2_colour[] Palette { get; set; }

I get this error: Attribute 'System.Runtime.InteropServices.MarshalAsAttribute' is not valid on this declaration type. It is valid on Field, Parameter, ReturnValue only.
So I need to make that property a property with backing field so that I can put the MarshalAs on the field that looks like that private tr2_colour[] _palette; and then it works.
It'd be great if it was possible to put attributes on auto-properties so that they go automatically on the backing field.

[HaloFour]

Check out #7004.

[zdimension]

Ah I'm sorry I didn't see it. I think I can close this one.