ss="spec value anchored" id="val-nop"><a href="#val-nop" class="anchor"></a><code><span><span class="keyword">val</span> nop : <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p><code>nop</code> is an attribute that does nothing.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-string"><a href="#val-string" class="anchor"></a><code><span><span class="keyword">val</span> string : <span>string <span class="arrow">&#45;&gt;</span></span> <span>string <span class="