Package functions cannot be abstract?!

[Benjamin Schaaf]

On Wednesday, 30 January 2019 at 04:05:15 UTC, Jonathan Levi 
wrote:
> Do you have a recommendation on how to do what I am trying to 
> do?

So you want a public class that has private abstract methods that 
you share across private implementations. Why not use an 
interface?

     interface F {
         void foo();
     }

     private abstract class Base : F {
         abstract void bar() {
             ...
         }
     }

     class Impl : Base { ... }