delegate_circuits.cs

using System;
using System.Collections.Generic;
public class C {
    public void M() {
        var actions = new List<Action>();
        
        for(var i = 0; i<10; i++)
        {
            actions.Add(() => Console.WriteLine(i));
        }
        
        for(var i = 0; i<10; i++)
        {
            var index = i;
            actions.Add(() => Console.WriteLine(index));
        }
    }
}

​delegate_circuits.decompiled.cs

using System;
using System.Collections.Generic;
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
{
    [CompilerGenerated]
    private sealed class <>c__DisplayClass0_0
    {
        public int i;

        internal void <M>b__0()
        {
            Console.WriteLine(i);
        }
    }

    [CompilerGenerated]
    private sealed class <>c__DisplayClass0_1
    {
        public int index;

        internal void <M>b__1()
        {
            Console.WriteLine(index);
        }
    }

    public void M()
    {
        List<Action> list = new List<Action>();
        <>c__DisplayClass0_0 <>c__DisplayClass0_ = new <>c__DisplayClass0_0();
        <>c__DisplayClass0_.i = 0;
        while (<>c__DisplayClass0_.i < 10)
        {
            list.Add(new Action(<>c__DisplayClass0_.<M>b__0));
            <>c__DisplayClass0_.i++;
        }
        int num = 0;
        while (num < 10)
        {
            <>c__DisplayClass0_1 <>c__DisplayClass0_2 = new <>c__DisplayClass0_1();
            <>c__DisplayClass0_2.index = num;
            list.Add(new Action(<>c__DisplayClass0_2.<M>b__1));
            num++;
        }
    }
}

​​.sharplab.json

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