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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 - [ES2016] Allow assignment in for-in head in not-strict mode"
   href="https://bugs.webkit.org/show_bug.cgi?id=160955">bug 160955</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #286755 Flags</td>
           <td>review?, commit-queue?
           </td>
           <td>review+, commit-queue-
           </td>
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES2016] Allow assignment in for-in head in not-strict mode"
   href="https://bugs.webkit.org/show_bug.cgi?id=160955#c14">Comment # 14</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES2016] Allow assignment in for-in head in not-strict mode"
   href="https://bugs.webkit.org/show_bug.cgi?id=160955">bug 160955</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>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=286755&amp;action=diff" name="attach_286755" title="Patch">attachment 286755</a> <a href="attachment.cgi?id=286755&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=286755&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=286755&amp;action=review</a>

<span class="quote">&gt; JSTests/stress/for-in-tests.js:161
&gt; +    var foo = function(a, b, first) {
&gt; +        {   
&gt; +            let p = 'some-value';
&gt; +            for (var p = b in a) {}
&gt; +            if (first)
&gt; +                return p;
&gt; +        }
&gt; +        return p;
&gt; +    };</span >

can you also add this test to make sure if throws a runtime exception when we write to the const variable:
foo = function(a, b) {
    {
        const p = 'some-value';
        for (var p = b in a) { }
    }
}</pre>
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