s="anchor"></a><code><span class="keyword">val</span> force_until_first_some : <span><span><span><span class="type-var">'a</span> option</span> lazy_t</span> list</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> option</span></code></dt><dd><p><code>force_until_first_some xs</code> forces the computation of each element of <code>xs</code> and returns the first that matches (Some _); or, if no such element exists, it returns None.</p></dd></dl><dl><dt class="spec value" id="val-eval_until