using System;

using System.Collections.Generic;

using System.Linq;

​

public class Options {

  public int Foo { get; set; }

  public int Bar { get; set; }

}

​

public class Program

{

  public static void DoStuff(Options options) {

    // ...

  }

​

  public static void Main()

  {

    // This compiles, using C#9's new partial type inference 

    // <https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-9.0/target-typed-new>

    DoStuff(new() { Foo = 123 });

  }

  // But if you uncomment this overload, it doesn't any more,

  // as the call on line 19 becomes ambiguous   

  //public static void DoStuff(string blah) {}

}

​