!7

sS extensionCode = [[
  sclass existing {
    svoid bla {
      print("I was overwritten");
    }
  }

  sclass ext {
    svoid yo {
      print("Yo!");
      existing.bla();
    }
  }
]];

sclass existing {
  svoid bla {
    print("I exist");
  }
}

p {
  liveWire(extensionCode);
  call(getClass("main$ext"), "yo");
}