<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/163355>163355</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-format] Crash when using AllowShortNamespacesOnASingleLine with AlignAfterOpenBracket: BlockIndent
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang-format
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          marco-antognini-sonarsource
      </td>
    </tr>
</table>

<pre>
    The following code crashes:

```cpp
namespace {
void xxxxxxxxxxxxxxxxxxxxx(nnnnn::TTTTTTTTTTTTT const *mmmm,
 YYYYYYYYYYYYYYYYY &yyyyyyyyyyyyyy);
} //
```

```shell
clang-format \
  --style="{ColumnLimit: 120, AllowShortNamespacesOnASingleLine: true, AlignAfterOpenBracket: BlockIndent}" \
  reproducer.cpp
```

In release with assertion, I get this assertion violation

```
Assertion failed: (LBrace && LBrace->is(tok::l_brace)), function isBlockIndentedInitRBrace, file FormatToken.cpp, line 74.
```


<details><summary>Stacktrace</summary>
<p>

```
0 libLLVMSupport.dylib     0x00000001012cf7e0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1 libLLVMSupport.dylib     0x00000001012cd290 llvm::sys::RunSignalHandlers() + 172
2  libLLVMSupport.dylib     0x00000001012d02c8 SignalHandler(int, __siginfo*, void*) + 344
3  libsystem_platform.dylib 0x000000018f7a96a4 _sigtramp + 56
4  libsystem_pthread.dylib  0x000000018f76f848 pthread_kill + 296
5  libsystem_c.dylib        0x000000018f6789e4 abort + 124
6 libsystem_c.dylib        0x000000018f677c18 err + 0
7  libclangFormat.dylib 0x000000010081fd20 clang::format::CommaSeparatedList::formatAfterToken(clang::format::LineState&, clang::format::ContinuationIndenter*, bool) (.cold.1) + 0
8 libclangFormat.dylib     0x00000001007beb14 clang::format::FormatToken::opensBlockOrBlockTypeList(clang::format::FormatStyle const&) const + 0
9  libclangFormat.dylib     0x000000010078b644 clang::format::ContinuationIndenter::mustBreak(clang::format::LineState const&) + 580
10 libclangFormat.dylib     0x00000001007fb428 clang::format::(anonymous namespace)::OptimizingLineFormatter::addNextStateToQueue(unsigned int, clang::format::(anonymous namespace)::OptimizingLineFormatter::StateNode*, bool, unsigned int*, std::__1::priority_queue<std::__1::pair<std::__1::pair<unsigned int, unsigned int>, clang::format::(anonymous namespace)::OptimizingLineFormatter::StateNode*>, llvm::SmallVector<std::__1::pair<std::__1::pair<unsigned int, unsigned int>, clang::format::(anonymous namespace)::OptimizingLineFormatter::StateNode*>, 3u>, std::__1::greater<std::__1::pair<std::__1::pair<unsigned int, unsigned int>, clang::format::(anonymous namespace)::OptimizingLineFormatter::StateNode*>>>*) + 96
11 libclangFormat.dylib     0x00000001007fa948 clang::format::(anonymous namespace)::OptimizingLineFormatter::analyzeSolutionSpace(clang::format::LineState&, bool) + 1472
12 libclangFormat.dylib     0x00000001007f7024 clang::format::UnwrappedLineFormatter::format(llvm::SmallVectorImpl<clang::format::AnnotatedLine*> const&, bool, int, bool, unsigned int, unsigned int, unsigned int) + 1728
13 libclangFormat.dylib     0x00000001007a7558 clang::format::(anonymous namespace)::Formatter::analyze(clang::format::TokenAnnotator&, llvm::SmallVectorImpl<clang::format::AnnotatedLine*>&, clang::format::FormatTokenLexer&) + 556
14 libclangFormat.dylib 0x00000001007e13c0 clang::format::TokenAnalyzer::process(bool) + 1376
15 libclangFormat.dylib     0x00000001007bddc0 std::__1::__function::__func<clang::format::internal::reformat(clang::format::FormatStyle const&, llvm::StringRef, llvm::ArrayRef<clang::tooling::Range>, unsigned int, unsigned int, unsigned int, llvm::StringRef, clang::format::FormattingAttemptStatus*)::$_12, std::__1::allocator<clang::format::internal::reformat(clang::format::FormatStyle const&, llvm::StringRef, llvm::ArrayRef<clang::tooling::Range>, unsigned int, unsigned int, unsigned int, llvm::StringRef, clang::format::FormattingAttemptStatus*)::$_12>, std::__1::pair<clang::tooling::Replacements, unsigned int> (clang::format::Environment const&)>::operator()(clang::format::Environment const&) + 112
16 libclangFormat.dylib     0x000000010079fc4c clang::format::internal::reformat(clang::format::FormatStyle const&, llvm::StringRef, llvm::ArrayRef<clang::tooling::Range>, unsigned int, unsigned int, unsigned int, llvm::StringRef, clang::format::FormattingAttemptStatus*) + 1948
17 libclangFormat.dylib 0x00000001007a0bcc clang::format::reformat(clang::format::FormatStyle const&, llvm::StringRef, llvm::ArrayRef<clang::tooling::Range>, llvm::StringRef, clang::format::FormattingAttemptStatus*) + 52
18 clang-format 0x000000010062d360 clang::format::format(llvm::StringRef, bool) + 5172
19 clang-format             0x000000010062b1f8 main + 2024
20 dyld 0x000000018f3ceb98 start + 6076
```

</p>
</details>

Tested with current main (3793e75b7af7).
Bisection shows the bug was introduced in https://github.com/llvm/llvm-project/commit/083f099a345f02390d00a8196d4ffa36ae71c82f, i.e., the commit that introduced `AllowShortNamespacesOnASingleLine` from https://github.com/llvm/llvm-project/pull/123010.

</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWU1v4zjS_jX0hYhBUd8HH2R3B2-AvN277ewAezJoqWRzQ5Fakkra8-sXJJVYTuxuZzCzmAWGEGB9kFVPPSxWVSrMGL6TAAuULlH6acYGu1d60TFdqxsmrdpJLvmNUZJpowZdw2yrmsPiYQ-4VUKoZy53uFYN4FozsweD4goRf2UkXHXfI1JJ1oHpWQ0Y5UtEqifFG_z93EC0kG44SXH1MB24VtJYjGjVdV2H6AqRCv_z7cCIZoeTgWiJYqcV5Z8worfumiB8A9jsQQhEqlowubtple6YxSj1yvDNjbEHASj-hChF-XKlxNDJe95xi-IKR5QgusKVo2a9V9p-ebHbfJXVmsudgHsuwc21eoAwme9k1VrQX3uQS83qR_DClkLVj3eyAWlR7vS9otDQa9UMNeh5oPeNLXcSaxDADOBnbveYGQPaciWdvju8A4vtnpvje_zElWB-xikZiFTV66SWcQGNg4Zoce-QgiMb0QyHpxsUf-YG0cKqx7B_YrN1H9wOuGuF20HWXhg3E_uguZPcfluGuSvccgH41lP_oB5BejPpCgsuAefJ_Mz2kQrFqwYs48Kg-DOKV2boOqYPKP68tqx-tF54vEL09vglLOvHu1OpBAu-vb__5f_XQ98rbefNQfAtdoN8J2FEJKJ1mwPBQjx1wWZzMOHmb5pL63U_BMOK4yTNnjfKWA2s8xSuMJcW0RIjusRphkgVXau-oeVZ9d8GueY7ycT_MdkI0G5jXjREOUWkovhKHQ2hdYFPpCFaeMQrvNkYvuOyVYhW7tmdbX8bVMVJgkgVe1XmYCx0m14w6w7WqO6oqmhzVmYswU6k1azrj3wkJxLsXgNrXvCeSMjaIinwOGPzyIXwQmjppKRTKfXEXnwqJcuLEhLMtkrbwBh1ZmTXrs7rqMCgtV_rvCn3in1QCY79znhCiqhtKMF-UtjDEH7C_Up1HVtDzzSz0NxzY6dzfATxhwXR4oIEF3rWllkYXe6iImm5HHw8GM-nHvd2q5QIG1vMayWaefSyzc7G4ryJb9yJ5FvYRskl7ZNjH16oHmQIFl-1_3k49ODNv2hokLF2oTokDW9w-ZpAAtzywpa8w1tss-Qi3rNs-S_dYOxSA3u8YkdOYHqfLxzEiFwJsd0mtLgEEdGCSSUPnRoMfk3FPi26z197yzv-K5c7ByfoeTWCNc0X-G49yAf19wFc1ioG6SuHBo8x4A9Q7DV-UQ2cuN4Kn6r2n4xtwprNJgo3veZKc3vY_NsDjldnpjCuf_ThrYknz_Hn_4bVQcsxtK87JsQvUFv1Q-R_fpPiYbx5D3Wngfml_7P2heuYAH3eiaJrDzIrkz_mIEsmDr_CWonBhap1WHltqjgG_iWOEl89RPRak3JCL4bPf8hnzfreJbR3kMd507ppcgTuul6geHVBbiWlsiFRynFnJjH2GE5GVzkfXX72_FpMFY6P-Eo-WJ6mv3WLz2_q5X30eXTkQunR9t-Hzh8XEZM0fg_fQU9TW6hvk58XRDlEcX2xIBpt8wzol7ivajCu0j1x2Dj3GtNr65OmqcmZ2LTZvPz5Mn2-TBp3tYBkYiz54dWfP1S2nOyX1VzuvkF7-rrSmh3c2xMoVinBXx6-MbmDMQh-zMkv6v-hFZbLXWUtdL2vHQYTIuKLkyebiJ5PAEwIVbOQ4v7i9Tfxeim3jmnyoinQC1ZDB9KaM-kTXyb4s3ziWkm3clrI-lQ4lvA6xJ_C9wE-KCcc4sgnnezKM1y2dVJfovIvB3rnQIHjMvGZLL8iNDOyrS8S_Oeh9PemKPVeOKbvl_bglJiMNnF2MWedK2mmuKZpKw1dmqg8VTYdp4q3UVvgjnEZGh7Etywowc1BNCf9ibiGbVlgY9nY3ciIz5Bvm2q-W9a_9skQvZ102PyUBzAWmtBmrAet3ckdERRxXsaQp9uctTmi5RyRaskNhP6f2atng-0e8HbY4WdmnE-HrqZzb7y3tveNLN-v3XG7H7bzWnWI3nrqws9Nr9W_oLaI3taq67i7IUXckrJkcZK2hMYlaQhhRVRmTdK2LM4Y5FFdUE83n8Pc_TocQQC2e2anWFBGft7PzQhuteo-jrofhED0NqIxiYhjaNYs4qaMSzaDRZRnJImzNM1m-0UaZ21TsKQhJURkW5R1TFpo66RhGcR1NOMLSmgakSiJCCmjbM7cHCjjhqSQtpCjhEDHuJg7DHOldzNuzACLKIvjNJ0JtgVh_P8CKJ16HKIUpZ9meuGxb4edQQkR3FhzlGS5Ff7_CCcL0094pZnZ4-c9SDwYLnc_b44HZ7qmLT4btFh8mHJvtHGkB7ufFvQ_AQAA__8pdskj">