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+<title>is_none — Ludic</title>
+<meta name="description" content="True when an option is empty.">
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">is_none</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-builtin">function</span>
+    <h1 id="top">is_none</h1>
+  </div>
+  <code class="sig">is_none(o: option) -&gt; bool</code>
+  <div class="desc"><p>Returns true when an <code>option</code> is empty (it is <a href="fn-none"><code>none</code></a>). The complement of <a href="fn-is_some"><code>is_some</code></a>.</p></div>
+  <div class="params"><h2>Parameters</h2><div class="param" id="param-o"><code class="pname">o</code><span class="pdesc">the option to test</span></div></div>
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program AI {
+  handler Step phase Update {
+    let target = none()
+    if is_none(target) { wander() }
+  }
+}</pre></div>
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