validation errors holder 验证错误收集器
The editor will mark the validation errors with red marks on the left and right sides, and add a red wavy underline to the invalid syntax.
编辑器会左右两侧用红色标记标明验证错误，并给无效的语法加一条红色波浪型的下划线。
UC4: Notify operator of validation errors.
UC 4：通知操作员校验失败。
Typical examples of such situation are validation errors.
这种情形的典型例子就是验证错误。
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