<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - P0704R1 implementation is too permissive"
   href="https://bugs.llvm.org/show_bug.cgi?id=34668">34668</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>P0704R1 implementation is too permissive
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </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>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>rs2740@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>P0704R1 only permits pointers to const & member functions to be used with
rvalues (i.e., the cv-qualifier-seq must be exactly const). const volatile &
member functions aren't included, as only lvalue reference to non-volatile
const types can bind to rvalues.

Clang's current implementation only checks for the presence of const:

struct F {
    void y() const volatile &;
};

using t = decltype((F().*&F::y)());

This shouldn't compile but does on Clang trunk.</pre>
        </div>
      </p>


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