ace"><a href="#vcd-interface" class="anchor"></a>VCD interface</h4><div class="odoc-spec"><div class="spec exception anchored" id="exception-Unsupported_vcd"><a href="#exception-Unsupported_vcd" class="anchor"></a><code><span><span class="keyword">exception</span> </span><span><span class="exception">Unsupported_vcd</span> <span class="keyword">of</span> <a href="#type-t">t</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-vcd_type"><a href="#val-vcd_type" class="a