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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - calling super() a second time in a constructor should throw"
href="https://bugs.webkit.org/show_bug.cgi?id=151113#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - calling super() a second time in a constructor should throw"
href="https://bugs.webkit.org/show_bug.cgi?id=151113">bug 151113</a>
from <span class="vcard"><a class="email" href="mailto:rniwa@webkit.org" title="Ryosuke Niwa <rniwa@webkit.org>"> <span class="fn">Ryosuke Niwa</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=151113#c2">comment #2</a>)
<span class="quote">> I'm working on patch for this issue.
> I've created new op code - op_is_empty to check if thisRegister is empty or
> unassigned before assign value returned from parent constructor(super). I
> implemented op_is_empty in LLInt and currently working on implementing it in
> JITOpcodes & DFG</span >
Why do you need a new op code for this? Can't we just use check_tdz?</pre>
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