<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 - Making class template breaks compilation"
   href="https://bugs.llvm.org/show_bug.cgi?id=41785">41785</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Making class template breaks compilation
          </td>
        </tr>

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

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

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

        <tr>
          <th>OS</th>
          <td>Linux
          </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>weiss@wsoptics.de
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The following code compiles iff `-DFIX` is provided:



template <int a>
struct b : b<a - 1>
{
        static constexpr unsigned c = a;
};
template <>
struct b<0>
{
};
#ifndef FIX
template <typename>
#endif
class X
{
        void e();
        static auto e(b<1> f) -> b<decltype(f)::c>;
        static auto e(b<decltype(e(b<2>{}))::c + 1> f) -> b<decltype(f)::c>;
        void e(b<decltype(e(b<2>{}))::c + 1>);
};



Also see <a href="https://godbolt.org/z/VHG_cE">https://godbolt.org/z/VHG_cE</a></pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>