@in[p posts]{
 <h2>@(post-title p)</h2>
 <p>@(post-body p)</p>
 <ul>
  @in[c (post-comments p)]{
   <li>@|c|</li>
  }
 </ul>
}

<h1>New Post</h1>
<form action="@|k-url|">
 <input name="title" />
 <input name="body" />
 <input type="submit" />
</form>