指定一个反应组件作为另一个组件的默认属性

我有两个组件, Section 和 Button . 我想要 截面 接受 纽扣 或A String 因为它是儿童道具。我如何指定 纽扣 作为节的默认子属性。

const Button = () =>
    <button type="button">Test</button>

const Section = props => {
  const { children } = props
    return (
      <div>{children}</div>
    )
}

Section.defaultProps = {
    children: /* ??? */
}

Section.propTypes = {
    children: PropTypes.node
}

我尝试了以下方法:

Section.defaultProps = {
    children: 'Section Test'     //Works fine
}

但是:

Section.defaultProps = {
    children: Button /* does not work */
}

我得到以下错误:

Warning: Functions are not valid as a React child. This may happen if you return a Component instead of <Component /> from render. Or maybe you meant to call this function rather than return it.