 href="../Pulselib/PulseBasicInterface/Attributes/index.html#type-t">Pulselib.PulseBasicInterface.Attributes.t</a> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'a</span>)</span> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-check_valid"><a href="#val-check_valid" class="anchor"></a><code><