auto_link issue with email address inside <a>

I think there is a bug in auto_link_email_addresses, if an e-mail
address is already linked.

This works fine:
<% p = "<a href=\"mailto:name@test.com\">name@test.com</a>" %>
<%= auto_link(p) %>

This fails:
<% p = "<a href=\"mailto:name@test.com\">Some Other Text</a>" %>
<%= auto_link(p) %>

And results in:

<a href="mailto:<a href="mailto:rname@test.com">name@test.com</

">Some Other Text</a>

Or do I overlook something?