private static boolean allOccurrencesInOneMethod(PsiElement @NotNull [] occurrences, PsiElement scope) {
    if (occurrences.length == 0) return true;
    GrMember container = GrIntroduceFieldHandler.getContainer(occurrences[0], scope);
    if (container == null) return false;
    for (int i = 1; i < occurrences.length; i++) {
      GrMember other = GrIntroduceFieldHandler.getContainer(occurrences[i], scope);
      if (other != container) return false;
    }
    return true;
  }
private static boolean allOccurrencesInOneMethod(PsiElement @NotNull [] occurrences, PsiElement scope)