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    <body><span class="vcard"><a class="email" href="mailto:mclow.lists@gmail.com" title="Marshall Clow (home) <mclow.lists@gmail.com>"> <span class="fn">Marshall Clow (home)</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Possible bug in std::sort"
   href="https://bugs.llvm.org/show_bug.cgi?id=47903">bug 47903</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>INVALID
           </td>
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        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Possible bug in std::sort"
   href="https://bugs.llvm.org/show_bug.cgi?id=47903#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Possible bug in std::sort"
   href="https://bugs.llvm.org/show_bug.cgi?id=47903">bug 47903</a>
              from <span class="vcard"><a class="email" href="mailto:mclow.lists@gmail.com" title="Marshall Clow (home) <mclow.lists@gmail.com>"> <span class="fn">Marshall Clow (home)</span></a>
</span></b>
        <pre>Sorry, not a bug.

Your predicate:

    const auto cmp = [](const std::string &s1, const std::string &s2) {
        bool isLess = s1 < s2;
        isLess = !isLess;
        return isLess;
    };

does not impose a strict weak ordering on the data.
In particular, it returns true when comparing a string to itself.</pre>
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