<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=http://email.email.llvm.org/c/eJylk8uu2yAQhp8Gb1AsG-zEXrDIrd1X2ZxVBWZsUxGTAk6UPn3HjqO0p0ddtBIIhsvMxz-Dcvoujlfwd9q4Acdohm6ahujHJho3EPZJhmC64QxDpK13Z0rW2TiY7yN8vUSPBo1uWgu99KCfa2agfYyXQPgWXWDrnFbOxtT5Dq0f2LV_c0f_eX2loXej1bSVxqb01AO9eKcsnGU0DW1kgEDR9-QqO5AMHW7_wvgHDd-fCD9OUB_gT5vljpSHxxHC9lQO-h_jKET91dvHATV4cwX9W9g5nnKxp66lt940_awGjSgGYQyPvCHNLGxApvMFpUGF6M3gFVw-PXbx6EIszRDT5RnLY6ovYGXEwHz7LjcergZuIbX2el4SdMjzTV2vCasf1xMtuK55LRM5xt55sce33vfSR_DJ6K14l23kGlWKpGhMbpdhhZn9Bk1E04QwQsBJyfm6SnqhC6agrdeyqrKyzjZVUfO2aqXkm7ws2yqxUoENYhKOMTV2kzCYLxysUQ1hu7kxVDX5fx4jWMZYljOeV0WR8bTlumQAWQ66yEFKUmRYoVixT9USL2aXSBZw05oQX5Imj8oBEI-8J9FEC2LnujHQV3msolu9Smr5lAFrLzw_iQLaOq-M1jAkM7OYgX8CcZA25g>53368</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Bogus unique_ptr-to-shared_ptr conversions should be forbidden
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            bug,
            libc++
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          CaseyCarter
      </td>
    </tr>
</table>

<pre>
    Every converting construction/assignment from `unique_ptr` to `shared_ptr` in https://godbolt.org/z/drYoErG6v should fail. The problematic cases are:
* construction/assignment to `shared_ptr<T>` from `unique_ptr<T[]>`, and
* construction/assignment to `shared_ptr<base[]>` from `unique_ptr<derived[]>`
both of which fail the "`Y*` is compatible with `T*`" constraint.

(Related: https://reviews.llvm.org/D117996)

</pre>
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