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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - std::inplace_merge seems to be unstable."
   href="https://llvm.org/bugs/show_bug.cgi?id=31166">31166</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>std::inplace_merge seems to be unstable.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>denis.yaroshevskij@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=17649" name="attach_17649" title="Code that reproduces the bug.">attachment 17649</a> <a href="attachment.cgi?id=17649&action=edit" title="Code that reproduces the bug.">[details]</a></span>
Code that reproduces the bug.

The standard requires std::inplace_merge to be stable. If I am correct, it's
not in the version of the library that I'm using. In the attached example:
Expected output:
[{1,0}, {2,0}, {2,1}, {3,0}, {4,0}, ]
Real output:
[{1,0}, {2,1}, {2,0}, {3,0}, {4,0}, ]</pre>
        </div>
      </p>
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