/div></details></div><div class="odoc-spec"><div class="spec value" id="val-exists2" class="anchored"><a href="#val-exists2" class="anchor"></a><code><span><span class="keyword">val</span> exists2 : <span><span>( <span><a href="#type-key">key</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-value">value</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-key">key</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-value">value</a> <span class="arrow">&#4