hasFeedback not work in Input component with addonBefore attr

[hirohe]

Environment(required)

• antd version: 2.8.0
• OS and its version: Windows 10
• Browser and its version: Chrome 56

What did you do? Please provide steps to re-produce your problem.

<Form.Item
    hasFeedback
    validateStatus="validating"
>
    <Input
        addonBefore={<Icon type="user"/>}
    />
</Form.Item>

What happen?

hasFeedback not working

Re-producible online demo

codepen

[lock]

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