List item with reference definition and laziness

[jgm]

- [foo]: bar
baz

is currently parsed by the reference implementations as

<ul>
<li>baz</li>
</ul>

It should presumably be

<ul>
<li></li>
</ul>
<p>baz</p>

We should add an example like this to the spec.

[jgm]

A related issue is whether reference link definitions can be wrapped lazily. I think the answer is no, given current definitions of laziness, but the reference implementaiton allows it:

> [foo]:
bar

- [hi]:
lo

[foo]
[hi]
<blockquote>
</blockquote>
<ul>
<li></li>
</ul>
<p><a href="bar">foo</a>
<a href="lo">hi</a></p>