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    <body><span class="vcard"><a class="email" href="mailto:sbarati&#64;apple.com" title="Saam Barati &lt;sbarati&#64;apple.com&gt;"> <span class="fn">Saam Barati</span></a>
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              <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>
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           <td style="text-align:right;">Attachment #276660 Flags</td>
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           <td>review+
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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#c39">Comment # 39</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:sbarati&#64;apple.com" title="Saam Barati &lt;sbarati&#64;apple.com&gt;"> <span class="fn">Saam Barati</span></a>
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        <pre>Comment on <span class=""><a href="attachment.cgi?id=276660&amp;action=diff" name="attach_276660" title="Patch">attachment 276660</a> <a href="attachment.cgi?id=276660&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=276660&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=276660&amp;action=review</a>

r=me with comments.

<span class="quote">&gt; Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h:1101
&gt; +            if (!(child.m_type &amp; SpecEmpty)) {</span >

You also want this one to check child.m_type &amp;&amp; ...

<span class="quote">&gt; Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp:4419
&gt; +        m_jit.comparePtr(JITCompiler::Equal, value.gpr(), TrustedImm32(ValueEmpty), result.gpr());</span >

I think this is probably correct, but I think it's way clearer as:
m_jit.comparePtr(Equal, value.gpr(), TrustedImm64(JSValue::encode(JSValue())), result.gpr())

<span class="quote">&gt; Source/JavaScriptCore/jit/JITOpcodes.cpp:185
&gt; +    compare64(Equal, regT0, TrustedImm32(ValueEmpty), regT0);</span >

ditto.</pre>
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