private void checkNullableStuffForMethod(PsiMethod method, final ProblemsHolder holder) {
    Annotated annotated = check(method, holder, method.getReturnType());

    List<PsiMethod> superMethods = ContainerUtil.map(
      method.findSuperMethodSignaturesIncludingStatic(true), MethodSignatureBackedByPsiMethod::getMethod);

    final NullableNotNullManager nullableManager = NullableNotNullManager.getInstance(holder.getProject());

    checkSupers(method, holder, annotated, superMethods);
    checkParameters(method, holder, superMethods, nullableManager);
    checkOverriders(method, holder, annotated, nullableManager);
  }
private void checkNullableStuffForMethod(PsiMethod method, final ProblemsHolder holder)