C# wish list: Partial Implementation of Interfaces

CSharp_Partial_Implementation.cs

/*
for C# wish list
----------------

partial implementation of interface while coding
(something can be done with DynamicMethod, IL generation
but I'd like a language feature)
*/

interface IMyInterface {
  int DoOperation1();

  string DoOperation2();

  void DoOperation3();
}

class ConsumerOfMyInterface {
  public void Consume(IMyInterface value) { // ...
  }
}


var partialImpl = new<IMyInterface> {
  DoOperation2() => return "hello, partial impl!";
  //other method -> default empty stub with: throw new NotImplemented();
}

new ConsumerOfInterface().Consume(partialImpl); // this is valid!