<html>
<head>
<base href="https://bugs.webkit.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - Non-helpful SyntaxError message for duplicate parameters in strict mode"
href="https://bugs.webkit.org/show_bug.cgi?id=106176#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - Non-helpful SyntaxError message for duplicate parameters in strict mode"
href="https://bugs.webkit.org/show_bug.cgi?id=106176">bug 106176</a>
from <span class="vcard"><a class="email" href="mailto:joepeck@webkit.org" title="Joseph Pecoraro <joepeck@webkit.org>"> <span class="fn">Joseph Pecoraro</span></a>
</span></b>
<pre>Compare to our error message for classes and arrow functions which force the stricter parsing, these are more helpful because they even note the duplicate parameter:
js> (class { f(a,a){} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (class { f(a,a){''} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (class { f(a,a){return a} })
Cannot declare a parameter named 'a' in strict mode as it has already been declared.:1
js> (a,a) => {}
Duplicate parameter 'a' not allowed in an arrow function.:1
js> (a,a) => {''}
Duplicate parameter 'a' not allowed in an arrow function.:1
js> (a,a) => {return a}
Duplicate parameter 'a' not allowed in an arrow function.:1</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>