/a><code><span class="keyword">val</span> validate : <span>(<span>(<a href="index.html#type-kind">kind</a> * <a href="B/index.html#type-t">B.t</a>)</span> * <span>(<a href="index.html#type-kind">kind</a> * <a href="B/index.html#type-t">B.t</a>)</span>)</span> <span>&#45;&gt;</span> <span>(<a href="index.html#type-kind">kind</a> * <a href="B/index.html#type-t">B.t</a>)</span> * <span>(<a href="index.html#type-kind">kind</a> * <a href="B/index.html#type-t">B.t</a>)</span></code></dt><dt class="spec value" id=