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+<title>is_err — Ludic</title>
+<meta name="description" content="True when a result carries a failure.">
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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_err</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-builtin">function</span>
+    <h1 id="top">is_err</h1>
+  </div>
+  <code class="sig">is_err(r: result) -&gt; bool</code>
+  <div class="desc"><p>Tests a <code>result</code>'s tag: <code>true</code> when it was built with <a href="fn-err"><code>err</code></a>, <code>false</code> when it was built with <a href="fn-ok"><code>ok</code></a>. Use it to detect the failure case explicitly — for example to count or log failures — while <a href="kw-try"><code>try</code></a>/<code>else</code> handles recovering a value. It is the exact negation of <a href="fn-is_ok"><code>is_ok</code></a>.</p></div>
+  <div class="params"><h2>Parameters</h2><div class="param" id="param-r"><code class="pname">r</code><span class="pdesc">the result to test</span></div></div>
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Retry {
+  function step(n: int) -&gt; result {
+    if n &lt; 3 { return err("not ready") }
+    return ok(n)
+  }
+  test "is_err detects the failure case" {
+    expect(is_err(step(1)))
+    expect(not is_err(step(5)))
+  }
+}</pre></div>
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