{# src/examen/templates/_code_block.html #}
{# Required context: block = {filename, lineno_start, highlighted_html} #}
<figure class="code-block">
  <figcaption class="code-block__filename">{{ block.filename }}</figcaption>
  <pre class="code-block__body"><code>{% for line in block.highlighted_html.splitlines() -%}
<span class="code-block__ln">{{ block.lineno_start + loop.index0 }}</span><span class="code-block__src">{{ line|safe }}</span>
{% endfor -%}</code></pre>
</figure>