"index.html#type-check">check</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-check">check</a></span></code></dt><dt class="spec value" id="val-check"><a href="#val-check" class="anchor"></a><code><span class="keyword">val</span> check : <span><span class="type-var">'a</span> <a href="index.html#type-check">check</a></span> <span>&#45;&gt;</span> <span>?&#8288;name:string</span> <span>&#45;&gt;</span> <span c