private static void checkNotNull(PsiElement @NotNull [] elements,
                                   @NotNull FindUsagesHandler handler,
                                   @NonNls @NotNull String methodName) {
    for (PsiElement element : elements) {
      if (element == null) {
        LOG.error(handler + "." + methodName + " has returned array with null elements: " + Arrays.asList(elements));
      }
    }
  }
private static void checkNotNull(PsiElement @NotNull [] elements,
                                   @NotNull FindUsagesHandler handler,
                                   @NonNls @NotNull String methodName)