code: private void computeInitialPositions() {
      positions.putAll(output.getPreExistingLocations());
      for (Key<?> key : output.getImplicitlyBoundKeys()) {
        GinjectorBindings initialPosition = computeInitialPosition(key);
  
        PrettyPrinter.log(logger, TreeLogger.DEBUG, PrettyPrinter.format(
            "Initial highest visible position of %s is %s", key, initialPosition));
  
        positions.put(key, initialPosition);
      }
    }
docs: Place an initial guess in the position map that places each implicit binding as high as
  possible in the injector tree without causing double binding.