//Original code
namespace ConsoleApplication4
{
    class Program
    {
        static Action F()
        {
            var d = new Dictionary<string, string>();
            var freakingLargeDictionary = new Dictionary<string, string>();

            //Filling our freakingLargeDictionary with some random data.

            var a1 = new Action(() => { d.Add("a1", "a1"); freakingLargeDictionary.Add("a1", "a1"); });
            var a2 = new Action(() => { d.Add("a2", "a2"); });

            return a2;
        }

        static void Main(string[] args)
        {
            //You've just captured a couple of useless gigabytes with "a", right?
            var a = F();
        }
    }
}

//Disassembly
namespace ConsoleApplication4
{
	internal class Program
	{
		[CompilerGenerated]
		private sealed class <>c__DisplayClass2
		{
			public Dictionary<string, string> d;
			public Dictionary<string, string> freakingLargeDictionary;
			public void <F>b__0()
			{
				this.d.Add("a1", "a1");
				this.freakingLargeDictionary.Add("a1", "a1");
			}
			public void <F>b__1()
			{
				this.d.Add("a2", "a2");
			}
		}
		private static Action F()
		{
			Program.<>c__DisplayClass2 <>c__DisplayClass = new Program.<>c__DisplayClass2();
			<>c__DisplayClass.d = new Dictionary<string, string>();
			<>c__DisplayClass.freakingLargeDictionary = new Dictionary<string, string>();
			Action a = new Action(<>c__DisplayClass.<F>b__0);
			return new Action(<>c__DisplayClass.<F>b__1);
		}
		private static void Main(string[] args)
		{
			Action a = Program.F();
		}
	}
}