<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 - Segmentation fault parsing parameter pack expansion"
   href="https://bugs.llvm.org/show_bug.cgi?id=50196">50196</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Segmentation fault parsing parameter pack expansion
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>10.0
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>FreeBSD
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>serpent7776@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I got segfault compiling this code:

#include <utility>

template <std::size_t ...Ts>
struct Ice<std::make_index_sequence<sizeof(Ts...)>>
{};

I'm using clang 10.0.1, but I also reproduced the issue with clang 12 and trunk
on godbolt <a href="https://godbolt.org/z/5eEsvWdxd">https://godbolt.org/z/5eEsvWdxd</a>

The issue persists if I omit parameter pack expansion on line 4:

#include <utility>

template <std::size_t ...Ts>
struct Ice<std::make_index_sequence<sizeof(Ts)>>
{};</pre>
        </div>
      </p>


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