<a href="#val-check_variadic_sentinel" class="anchor"></a><code><span><span class="keyword">val</span> check_variadic_sentinel : 
  <span><span class="optlabel">?fails_on_nil</span>:bool <span class="arrow">&#45;&gt;</span></span>
  <span>int <span class="arrow">&#45;&gt;</span></span>
  <span><span>(int * int)</span> <span class="arrow">&#45;&gt;</span></span>
  <a href="../Builtin/index.html#type-t">Builtin.t</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-chec