<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/113722>113722</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] Assertion `!isTokenSpecial() && "Should consume special tokens with Consume*Token"' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend,
            crash-on-invalid,
            clang:frontend:fuzzer
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          yijan4845
      </td>
    </tr>
</table>

<pre>
    **This testcase is generated by a fuzzer.**

Compiler Explorer: [https://godbolt.org/z/9EEEefGbT](https://godbolt.org/z/9EEEefGbT)

This invalid code will crash on Clang Assertion Trunk:
```cpp
struct S {
 void m(int x = 0,
#pragma message "Any message") {
    int z = 0;
    #pragma unused(x)
  }
};
```

It seems that this goes back to clang-5.

Stack dump:
```
clang++: /root/llvm-project/clang/include/clang/Parse/Parser.h:549: clang::SourceLocation clang::Parser::ConsumeToken(): Assertion `!isTokenSpecial() && "Should consume special tokens with Consume*Token"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <source>:5:13: at annotation token
2.      <source>:1:1: parsing struct/union/class body 'S'
 #0 0x0000000003bcced8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcced8)
 #1 0x0000000003bcab9c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bcab9c)
 #2 0x0000000003b18248 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000072f27a642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000072f27a6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000072f27a642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000072f27a6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000072f27a62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000072f27a639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000066bb12f clang::Parser::ConsumeAndStoreInitializer(llvm::SmallVector<clang::Token, 4u>&, clang::Parser::CachedInitKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bb12f)
#10 0x00000000066e7c3a clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&, llvm::SmallVectorImpl<clang::DeclaratorChunk::ParamInfo>&, clang::SourceLocation&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7c3a)
#11 0x00000000066e8598 clang::Parser::ParseFunctionDeclarator(clang::Declarator&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e8598)
#12 0x00000000066ed6af clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ed6af)
#13 0x00000000066da6e6 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66da6e6)
#14 0x000000000816c711 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x816c711)
#15 0x00000000066c9d0f clang::Parser::ParseDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66c9d0f)
#16 0x00000000066fe8a5 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&, clang::VirtSpecifiers&, clang::ActionResult<clang::Expr*, true>&, clang::Parser::LateParsedAttrList&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66fe8a5)
#17 0x0000000006705920 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6705920)
#18 0x0000000006707611 clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&, clang::ParsedAttributes&, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6707611)
#19 0x0000000006709157 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6709157)
#20 0x000000000670b903 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x670b903)
#21 0x00000000066e0100 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e0100)
#22 0x000000000669dc34 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669dc34)
#23 0x000000000669e69e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669e69e)
#24 0x00000000066a5e33 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a5e33)
#25 0x00000000066a6d1d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a6d1d)
#26 0x00000000066a71c0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a71c0)
#27 0x0000000006699202 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6699202)
#28 0x0000000004542c48 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4542c48)
#29 0x00000000047fe239 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47fe239)
#30 0x000000000477cbde clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x477cbde)
#31 0x00000000048e3a0e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e3a0e)
#32 0x0000000000ce1c8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce1c8f)
#33 0x0000000000cd998a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#34 0x0000000004586969 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#35 0x0000000003b186f4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b186f4)
#36 0x0000000004586f5f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#37 0x000000000454c85d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454c85d)
#38 0x000000000454d94d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x454d94d)
#39 0x0000000004555275 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4555275)
#40 0x0000000000cdeb4f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdeb4f)
#41 0x0000000000badae4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbadae4)
#42 0x000072f27a629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#43 0x000072f27a629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#44 0x0000000000cd943e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd943e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
ASM generation compiler returned: 134
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkmt1y27iSgJ-GvkFJRYIUfy58ocj2rGczlVTkmp07FQg2JUxIgAuAjpyn3wJISQT1Y3s28qk6J2XHEgk0uj80uhskiFJszQFuvdknb3Z3Q1q9EfL2hf1NeJRGs5tcFC-3Hp57eP60YQppUJoSBYgptAYOkmgoUP6CCCrbnz9BTrvGnn_n-f3_C1E3rAKJ7rdNJSRIL5wjb_Zpo3WjvHDu4QcPP6xFkYtKT4Vce_jhp4cfsvv7eyh_y5-82Z2H07c3x9lweKs348-kYgWiogD0g1UVopKoDRIcLSrC12iuFEjNBEdPsuXfzTidjNjvfmjTdFeUli3VaIm85FN3BT0LVqDawynjGm2RF94h38OLXgIOG0nWNUE1KEXWgDyM5_xl99XD2MPZQBpCyMj52csJB9cPslreKig8nG735iLkJXf9mMndvt_egiGUR40UQK2Q3hCNtEG0FqBQTuh3pAWiBspkNh32WWpzs2jr5phO99X28vAn82PmGD9IIbSHH6rquZ40UvwN1Hzt2z0wTqu2gMGVr0Qq2P2V040XzmdRZoR1LcK5F86XopUUPgtK7IQN7nTdus8LwVVbw5P4DtzDqcEUzgfzbLTGAVO2wbIBykjVtUMejj0cm3labkRbGbexspDqmiFt-ij0g-kN6scxK6QbCns4QSVhFRQ9v6-f7-fLe6TavGYaEZS3ayShEVIb1iPHZnrT5lMq6p7bMT6mVAvKww-I8AL1EJHeQO_UZhK1JBQ8vECNhEYKCkpBgZQlZy6bnkQpQZldwbLlSFHJGj09O9n-1POzr1KsJakRkeu2Bq5VP9GisRPbL_UJ7JZ6P7UTsuOuJtouMPyQM36YeeMzaLIufhBZTiI0WaOJMHJJ0xjprW5aPVVoUhsWaDLZpvGEqHqiXrgmWy-8Y1xDhSYlF5NnkLlQYO6jyRJNJmtKJ1qIim4I4154d1Ff01hx0qiN0GhSUlEJOSkYWXOhNKOqG8OSdi574aLHG953wAIDzLkczmdeOA9CA41oRDgXunNi61FdN3yiW9D_ooZIxfgadVHIww8tZ6LnqBQy8Rp5OFl6OOmjgodDH_lbf_cvzCmFIkXWt-xKUS-qXz6ScW1n_qlzn_TQSJIfK6G0BFLb5bEwQapbLOkvmn8Pf_K3vXqHqObhMBjpT_KMntJ_UQHhbfOFL9ma29XccpvgClQJM8o1tDXKONpiV9sgxVGKFsZfvgEVzyBfOvX-i_CiMoOmPUmnzUJwDVs9NXknnPv2dz9E2A-R4BInJI7wDPu9aRXLPfywTeNVHE0qxtvtZM3b7gadKjGNreK2i6N25MrM4qykqNEbCaRYfTcp810D2P7OALOx0lESo7WyLN6rfJTEjuzYlY3TpAwRyU2EfZdk29GRnBxJDvJ3ywxyR2bqygwzyOL3ybRdHJnZ0OviOM8DXL6SGue8WGoh4ZEzzUjFflpnPKyrZU2q6k-gWkgvXAxk9YlugaLWhKcuHJwbi9ANFGaI_2a8uMIS7G09VH04DHwXBiQ0JOcUtJ-_Eklq0CDvgFZE2pi8qEhripF00HF3W8h-fZ6yvJhrLVneapOkLZuTTB_rpnK5DqRv-iLUiiT1Iy_FSdRuLdTfz4WorkLagnRIByPS6SxLL5J-aDk1gx1sPUf4jF8d0x20-EQqwikUd1CxmmmQJpF9B-mAuSYgY78DCI8AFTE5uy7t5zsmgeo34rmGCUZDx4TQNaEgMcSXTdgr-cg1yC4VX5pju4Fy2wyF2j1ldhnEVVhYUx0W0ZBFGsQ0CQJnPZrq6X67Ia0yQ-xyfFdCtfx_mN4s27JklEFfai2brtS6sKiHAaTs189KQumFix05u725vwKE3kYHwsx1CJoV_is-_S_zZqubo3zsKl9CSmYXlV_89dcfUOeH3CDkJyiP8uYbY9ifTGq72ywZyBMRbG5n9xuottJudrjfNtKuhAXSsoVXM-9nouEQMT8zpa8F2TJ0ICcO5MSfZdh_DfLC7GBc0tb7U4eO2cnu-b07PxyNWzxB3VREg82wJ9szvjb6fJs_Pn7Juy34_BoYO0oOxnSEMYndaPN2jCbwfLWPjtQrRN-fdJ9eGtgLMF9G940aV2NmkDjMshGzLJglb1vfvQ30hN8dR-S33jyDb78xtXu_j8NlaAxxYX-EK8_88DIu418Dfxli0uL7YIfQFfxvR2UMN4L__8v2RJjYlX5npO7GfkdZf43pMfSd6RnX137gXw6kgzU_TDPj9HQ1zv-c74W0NR-1N1snRpk2wYaTGvZSr1EPG-TOnIxK-qygYfTqnHyRh51PebosfmP6erVFn7BOT_HRlF0BmSXiIBttITKIM3irGzvkmKm5xtH5KuDGPvch4AwXB1zkgiMzCC-H5_tt51pnS6hrwboCDmutg2O08yBxERQXcTyJ5jM8Q9Ul1SGHLw353xa-ann8DOY3Kdrmm9lfnXriAjXpPv0hiraCx7oR0mzlNFyrvrZmOhxGmxiSBPRyWnhgUul_DxjGVgdGMgouGfbxEYz58mlU0hnVP-ixkFXJ0dmp7KNZhGnkPDdbiAJ-A97tBnf7P6Cthv7S7k3lL9W0V8TR1Kmno6QEHGZDTR-kSb68OKHqlZTsdBgq6b7hipKE5gW4OLthH7nShFM4TfS8VVfx5V5PxxCn3otSCInvGNKrfLDnWZzarxzZe5UI3evnGOAURz6FgKYlojRY1cTIGLxemEtJXmxgWdANkfYlu631TKBZIPda_5DwOnZ0WjpmhK4ZRZalBO3gL4InGylOvyvZPdc_smn0KsDI6AvXXTvrZYVkzyCPX_wZtSI3bKRxFmfd09O3PiG0TSipqpzQ76uSuwG_G7v3oUWwEHVNeDFe1CfnUOm-nWjM6MQwGPDRkvF1n0a6Cd53WK3odhsE3ZecKEZXyjbvKTqNzYWVloRptbs9EkeqyqyJ7qVVf980mR9CvHWijnn_gDmpSJ0XxMPJ4GFquntr_LvIT8_HbPyuNy6jwVSceqPb3fnW8iUpoXpxcH70w91eY8fz47GLlTPn4e5_nIsY6NOGSD31L_pCMkrpNJ0VZ8HZuSNHGXNH0wnmo46mwSBgLC6MMWw6H70c3Nv2iwsIY7bjUONSp8iid3P5XeTqPJTfRf6ZKe1AuRSa937QEGZc4PgZ3EWOvbN8CE0Dy6HplmOz2Qwns3Oa3w0-O4XDiYrh3Cx8IM0rlLMWz5Bf5I8SO-RRH952FcpOfxtW5n1QeD1t_-qaxGrmqO7Uhn5OCgIRMkr_6rE70c7YeHQMJiuyd544sl0cmeFYJkQ-Wq1Mt5XSROrVwLg3jwKRO0o0ruSiEFAn_9fPmRG-H314O5wjkFLI_VFWVPY7DET7FdEdGe0OlcKW6e6wchBGRs1WAZo8Iy2QAkBsUPb3g82Xf-xOZNtDsbtD1xJ0KzmYJWpkjc7t3hS3YZGFGbmB2yDBWZr6aZjcbG7TFBMaRnmShZlPaVgGWYKjJMRhmQRxXtywW-zjKPDxLEhxEiTTvIQoL8vMhwj8MgEv8qEmrJqapTMVcn1jz63eBkGYYHxTkRwqZQ-eY7yLFTsm9hDtwtywxywFn_QHuA83xj1M8fTTvonF3uzuRt7aQ7N5u1Ze5FdMaXVQRDNd2TPvnZTZ3UcfC75pZXX7z8_99gifb_H_BQAA___ydK0B">