static defaultProps breaks prefer-stateless-function

[evandavis]

The following is not caught by prefer-stateless-function:

import React from 'react';
import PropTypes from 'prop_types';

export default class Thing extends React.Component {
  static defaultProps = {
     foo: ''
  };

  static propTypes = {
    foo: PropTypes.string
  };

  render() {
    return <div>{this.props.foo}</div>;
  }
}

However, by removing static defaultProps, the error is reported:

import React from 'react';
import PropTypes from 'prop_types';

export default class Thing extends React.Component {
  static propTypes = {
    foo: PropTypes.string
  };

  render() {
    return <div>{this.props.foo}</div>;
  }
}

This is happening in 7.4.0.

[ljharb]

Thanks for the report!