span> list</span> <span>&#45;&gt;</span> <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> list</span></code></dt><dd><p>Applicative let binding. <code>let+ x = xl in e = let* x = xl in return e</code></p></dd></dl><dl><dt class="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.h