@Override
  public @NotNull IntentionAction createChangeToAppendFix(@NotNull IElementType sign,
                                                          @NotNull PsiType type,
                                                          @NotNull PsiAssignmentExpression assignment) {
    return new ChangeToAppendFix(sign, type, assignment).asIntention();
  }
@Override
  public @NotNull IntentionAction createChangeToAppendFix(@NotNull IElementType sign,
                                                          @NotNull PsiType type,
                                                          @NotNull PsiAssignmentExpression assignment)