Attempt to access deleted object with static append field

[Fusioon]

The issue happens due to the extension defining another append field, if the field in extension is not append its without issues

Code to reproduce:

static class Foo
{
	internal static append String s_ContentPath;

	public static StringView ContentPath => s_ContentPath;

	public static void Set(StringView resourcePath)
	{
		s_ContentPath.Set(resourcePath); // Error at runtime "Attempted to access deleted object"
	}
}

extension Foo
{
	internal static append String extPath;
}

class Program
{
	static void Main()
	{
		Foo.Set("bar");
		Console.WriteLine(Foo.ContentPath);
	}
}

Tested with: (Nightly 10/28/2022)

[Fusioon]

It's probably not issue with extensions, defining multiple static append fields seems to do the same

Code

static class Foo
{
	internal static append String s_ContentPath;
	internal static append String s_ContentPath1;
	internal static append String s_ContentPath2;

	public static StringView ContentPath => s_ContentPath;

	public static void Set(StringView resourcePath)
	{
		s_ContentPath.Set(resourcePath);
		s_ContentPath1.Set(resourcePath);
		s_ContentPath2.Set(resourcePath);
	}
}

class Program
{
	static void Main()
	{
		Foo.Set("bar");
		Console.WriteLine(Foo.ContentPath);
	}
}

[kallisto56]

On latest nigthly (https://github.com/beefytech/Beef/commit/7b29a4facb656eb5d6a87526e2b8a60b2128be42) this is still an issue. I've prepared a ready-for-testing project, that is slightly different: bug.1750.zip

What I've noticed, is that:

• This issue happens only when text is long enough;
• EAV happens AFTER we exit Main(), not inside String.Set(...);

Here is the code inside the project:

namespace bug1750;

using System;
using System.Diagnostics;


static class Foo
{
	internal static append String sFirst;
	internal static append String sSecond;
	internal static append String sThird;

	static public StringView sValue => Self.sFirst;

	static public void Set (StringView value)
	{
		Self.sThird.Set(value);
		Self.sSecond.Set(value);
		Self.sFirst.Set(value);
	}
}


class Program
{
	static void Main()
	{
		// This works fine
		Foo.Set("123456789");

		// But this will trigger EAV
		Foo.Set("1234567890");
	}
}

[kallisto56]

Also, this issue exhibits the same thing as in #1216, where DbgVis is failing to view variable state.

static public void Set (StringView value)
{
	// Place breakpoint here and hover mouse cursor over 'value' argument.
	Self.sThird.Set(value);
	Self.sSecond.Set(value);
	Self.sFirst.Set(value);
}

[bfiete]

Fixed at ec34aa3d43056edc50d3600fa61c3ebfdb72f924