a</span> list</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> list</span></code></dt><dt class="spec value" id="val-cart_prod"><a href="#val-cart_prod" class="anchor"></a><code><span class="keyword">val</span> cart_prod : <span><span class="type-var">'a</span> list</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> list</span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span> * <span class="type-var">'b</span>)</span> list</span></code></dt><dt class