"val-let+"><a href="#val-let+" class="anchor"></a><code><span class="keyword">val</span> let+ : <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">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="../index.html#type-t">t</a></span></code></dt><dd><p><code>let+ x = t in f x</code> is <code>map ~f t</code></p></dd></dl><dl><dt class