@Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (!(o instanceof NullabilityProblem<?> problem)) return false;
      return myKind.equals(problem.myKind) && getAnchor().equals(problem.getAnchor()) &&
             Objects.equals(myDereferencedExpression, problem.myDereferencedExpression);
    }
@Override
    public boolean equals(Object o)