ref="#module-Unsafe" class="anchor"></a><code><span class="keyword">module</span> <a href="Unsafe/index.html">Unsafe</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><dl><dt class="spec value" id="val-is_ok"><a href="#val-is_ok" class="anchor"></a><code><span class="keyword">val</span> is_ok : <span><span>(<span class="type-var">'a</span>, <span class="type-var">'b</span>)</span> Stdlib.result</span> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="va