List all pages below subsection

Based on this GitHub comment I found a very easy solution:

list.html

  {{ range .Sections }}
    <li>
        <a href="{{.Permalink}}">{{.Title}}</a>
    </li>
      {{ partial "lists/recursive.html" . }}
  {{ end }}

partials/lists/recursive.html

{{ $child_pages := union .Sections .Pages }}
{{ range $child_pages }}
  <li><a href="{{.Permalink}}">{{.Title}}</a></li>
  {{ partial "lists/recursive.html" . }}
{{ end }}