>Version 2.5.0</span></div><div class="result"><table class="table errors"><tbody><tr><td class="line">Line 5:</td><td class="msg">'a' was used before it was defined.</td></tr></tbody></table></div></div><iframe></iframe></div>
<h3 id="why-do-i-get-this-error-">Why do I get this error?</h3>
<p>This error is raised to highlight <strong>potentially dangerous code</strong>. Your code may
run without error, depending on the identifier in question, but is likely to
cause confusion to other developers and could i