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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiler crashes due to incorrect template pack syntax"
href="https://bugs.llvm.org/show_bug.cgi?id=48465">48465</a>
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<th>Summary</th>
<td>Compiler crashes due to incorrect template pack syntax
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dbronick@go.olemiss.edu
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Created <span class=""><a href="attachment.cgi?id=24257" name="attach_24257" title="Crash synopsis including tmp files (sh and cpp), original run script, and stack dump">attachment 24257</a> <a href="attachment.cgi?id=24257&action=edit" title="Crash synopsis including tmp files (sh and cpp), original run script, and stack dump">[details]</a></span>
Crash synopsis including tmp files (sh and cpp), original run script, and stack
dump
Overview: When an unexpected, unexpanded parameter pack is encountered in the
template arguments of a concept, the compiler crashes.
Steps to Reproduce: Attempt to compile the following with clang++-10
-std=c++20:
=======================Begin Sample============================
template<typename... Ts>
concept test = requires{sizeof...(Ts);};//trivially true
template<typename... Ts>
requires test<Ts>
struct Test{};
int main()
{
Test<>;
return 0;
}
=======================End Sample==============================
Actual Result: The compiler crashes with a seg fault
Expected Result: A syntax error message about an unexpected parameter pack
Build Data & Hardware: 2020 December 9th on Ubuntu 20.04.1 LTS with kernel
5.4.0-56-generic</pre>
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