="spec value" id="val-and+"><a href="#val-and+" class="anchor"></a><code><span class="keyword">val</span> and+ : <span><span class="type-var">'a</span> <a href="../index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="../index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span> * <span class="type-var">'b</span>)</span> <a href="../index.html#type-t">t</a></span></code></dt><dd><p><code>let+ x = t and+ y = t' in f x 