{
  'children' => [
    {
      'children' => [
        {
          'children' => [
            'a'
          ],
          'nodename' => 'expr1'
        }
      ],
      'nodename' => 'expr'
    },
    {
      'children' => [
        {
          'children' => [
            'b'
          ],
          'nodename' => 'expr2'
        }
      ],
      'nodename' => 'expr'
    }
  ],
  'nodename' => 'exprs'
}
