<h2 id="toc">[TOC]</h2>
<h1 id="header-1">Header 1</h1>
<p>The TOC marker cannot be inside a header. This test makes sure markdown doesn't
crash when it encounters this errant syntax. The unexpected output should
clue the author in that s/he needs to add a blank line between the TOC and
the <code><hr></code>.</p>