a href="#exception-Unsupported_vcd"><code>Unsupported_vcd</code></a> in case of failure (if there's no corresponding VCD type)</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-vcd_value"><a href="#val-vcd_value" class="anchor"></a><code><span><span class="keyword">val</span> vcd_value : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="../../../../Vcd_types/index.html#type-vcd_value">Vcd_types.vcd_value</a></span></code></div><div class="spec-do