D-lang Multiple Inheritance mimickry

main.d

import std.stdio;

interface Abstract1 {
    void overrideMe1();
    void sayHello();

    mixin template Abstract1Impl() {
        void sayHello() { import std.stdio; writeln("Hello"); }
    }
}

interface Abstract2 {
    void overrideMe2();
    void sayGoodbye();

    mixin template Abstract2Impl() {
        void sayGoodbye() { import std.stdio; writeln("Goodbye"); }
    }
}

class MyClass : Abstract1, Abstract2 {
  mixin Abstract1Impl;
  mixin Abstract2Impl;
  override void overrideMe1() { writeln("overrode 1"); }
  override void overrideMe2() { writeln("overrode 2"); }
}

void main() {
    auto it = new MyClass();
    it.sayHello();
    it.sayGoodbye();
    it.overrideMe1();
    it.overrideMe2();
}