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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segfault from export of nested struct"
href="https://bugs.llvm.org/show_bug.cgi?id=48396">48396</a>
</td>
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<th>Summary</th>
<td>Segfault from export of nested struct
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>ndkrempel@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<pre>The following code, compiled with -std=c++20, causes a segfault during parsing:
export module M;
struct A { struct B; };
export struct A::B {};
Reproduced in clang 10.0.0, 11.0.0, and trunk.
(The one-liner "class A{};export class A::B{}" will also repro it.)
Stack trace from trunk (<a href="https://gcc.godbolt.org/z/shr6nE">https://gcc.godbolt.org/z/shr6nE</a>):
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o
./output.s -mllvm --x86-asm-syntax=intel -S
--gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics
-fno-crash-diagnostics -std=c++20 <source>
1. <source>:3:20: current parser token '{'
#0 0x000055b863afd56c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2e1d56c)
#1 0x000055b863afb304 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2e1b304)
#2 0x000055b863afb595 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2e1b595)
#3 0x000055b863a6a0e8 CrashRecoverySignalHandler(int)
(/opt/compiler-explorer/clang-trunk/bin/clang+++0x2d8a0e8)
#4 0x00007f346a21d3c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
clang-12: error: clang frontend command failed with exit code 139 (use -v to
see invocation)
Compiler returned: 139</pre>
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</p>
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