Are

s allowed inside H1?

I was wondering if there would be any problems if I added a list inside a H1 heading:

<h1>
 <ul>
  <li><a href="...">some link</a></li>
  <li><a href="...">another link</a></li>
  <li>current page</li>
 </ul>
</h1>

the list is a "breadcrumb" type navigation.

Or is it better to insert it inside the list?

<ul>
 <li><a href="...">some link</a></li>
 <li><a href="...">another link</a></li>
 <li><h1>current page</h1></li>
</ul>