instruction is single trace, then the function mutates the state and returns the same state.</p><p>Otherwise the state is locked (if not) and new states are returned</p><p>In any case the returned states are unlocked.</p></dd></dl><dl><dt class="spec value" id="val-skip"><a href="#val-skip" class="anchor"></a><code><span class="keyword">val</span> skip : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="../../State/index.html#type-t">State.t</a> <span>&#45;&gt;</span> <span><a href="../../St