corresponding to a start node of a code block. Using this, when there is a code block, frontend can keep the correspondence between start/exit nodes of a code block.</p></dd></dl><dl><dt class="spec value" id="val-get_code_block_exit"><a href="#val-get_code_block_exit" class="anchor"></a><code><span class="keyword">val</span> get_code_block_exit : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><a href="index.html#type-t">t</a> option</span></code></dt><dd><p>Get an exit node corresponding to