C# feature request: implement interfaces on anonymous types

Question

I am wondering what it would take to make something like this work:

using System;

class Program
{
    static void Main()
    {
        var f = new IFoo { 
              


        

Answer 1

This wouldn't be possible currently.

What would be the difference between this and simply making IFoo a concrete class instead? Seems like that might be the better option.

What it would take? A new compiler and tons of checks to ensure they didn't break the other features. Personally, I think it'd just be easier to require developers to just create a concrete version of their class.