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⟨ 2 4 ⟩
</pre>
<p>If no header is compatible, the call results in an error.</p>
-<pre> <span class='Number'>3</span> <span class='Function'>CaseAdd</span> <span class='Number'>3</span>
-<span class='Function'>ERROR</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=MyBDYXNlQWRkIDM=">↗️</a><pre> <span class='Number'>3</span> <span class='Function'>CaseAdd</span> <span class='Number'>3</span>
+ERROR
</pre>
<h3 id="case-headers">Case headers</h3>
<p>A special rule allows for convenient case-matching syntax for one-argument functions. In any function header with one argument, the function name can be omitted as long as the argument is <em>not</em> a plain identifier—it must be <code><span class='Value'>𝕩</span></code> or a compound value like a list to distinguish it from an immediate block label.</p>