@Override
    public void visitReferenceExpression(@NotNull PsiReferenceExpression expression) {
      super.visitReferenceExpression(expression);
      if (expression.getParent() instanceof PsiExpressionStatement) {
        invalidCode = true;
        stopWalking();
      }
    }
@Override
    public void visitReferenceExpression(@NotNull PsiReferenceExpression expression)