dispisable_struct_using.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
public class C {
    public void Main()
    {
        var str = new DisposableStruct();
        
        using(str) {
            Console.WriteLine(str.isDisposed);
        }
    }
}

struct DisposableStruct : IDisposable {
    public bool isDisposed;
    public void Dispose() { isDisposed = true; }
}

​dispisable_struct_using.decompiled.cs

using System;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Security;
using System.Security.Permissions;

[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.Default | DebuggableAttribute.DebuggingModes.DisableOptimizations | DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints | DebuggableAttribute.DebuggingModes.EnableEditAndContinue)]
[assembly: SecurityPermission(SecurityAction.RequestMinimum, SkipVerification = true)]
[assembly: AssemblyVersion("0.0.0.0")]
[module: UnverifiableCode]
public class C
{
    public void Main()
    {
        DisposableStruct disposableStruct = default(DisposableStruct);
        DisposableStruct disposableStruct2 = disposableStruct;
        try
        {
            Console.WriteLine(disposableStruct.isDisposed);
        }
        finally
        {
            ((IDisposable)disposableStruct2).Dispose();
        }
    }
}
internal struct DisposableStruct : IDisposable
{
    public bool isDisposed;

    public void Dispose()
    {
        isDisposed = true;
    }
}

​​.sharplab.json

{
    "version": 1,
    "target": "C#",
    "mode": "Debug"
}