<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/122058>122058</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          wxie7
      </td>
    </tr>
</table>

<pre>
    code
```c
struct s {
#include <malloc.h>
};
```
just crash on assertions trunk
https://godbolt.org/z/nnjG4rW1n
I searched based on the assertion and found no related issues
generated by fuzzing
<details><summary><strong>Backtrace</strong></summary>
<p>

```
clang: /root/llvm-project/llvm/include/llvm/Support/Casting.h:578: decltype(auto) llvm::cast(From*) [with To = clang::FunctionDecl; From = clang::Decl]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' 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 -x c -std=c2x -c <source>
1.      /usr/include/malloc.h:69:59: current parser token ';'
2.      <source>:1:1: parsing struct/union body 's'
 #0 0x0000000003c8d758 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c8d758)
 #1 0x0000000003c8b464 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c8b464)
 #2 0x0000000003bd89a8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fb4a4442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007fb4a44969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007fb4a4442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007fb4a44287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007fb4a442871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007fb4a4439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006a1ba98 clang::Sema::AddAllocAlignAttr(clang::Decl*, clang::AttributeCommonInfo const&, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a1ba98)
#10 0x0000000006a3164a ProcessDeclAttribute(clang::Sema&, clang::Scope*, clang::Decl*, clang::ParsedAttr const&, clang::Sema::ProcessDeclAttributeOptions const&) (.isra.0) SemaDeclAttr.cpp:0:0
#11 0x0000000006a34ee3 clang::Sema::ProcessDeclAttributes(clang::Scope*, clang::Decl*, clang::Declarator const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6a34ee3)
#12 0x0000000006999e8d clang::Sema::CheckFieldDecl(clang::DeclarationName, clang::QualType, clang::TypeSourceInfo*, clang::RecordDecl*, clang::SourceLocation, bool, clang::Expr*, clang::InClassInitStyle, clang::SourceLocation, clang::AccessSpecifier, clang::NamedDecl*, clang::Declarator*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6999e8d)
#13 0x00000000069b2b3d clang::Sema::HandleField(clang::Scope*, clang::RecordDecl*, clang::SourceLocation, clang::Declarator&, clang::Expr*, clang::InClassInitStyle, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x69b2b3d)
#14 0x00000000069b3051 clang::Sema::ActOnField(clang::Scope*, clang::Decl*, clang::SourceLocation, clang::Declarator&, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x69b3051)
#15 0x0000000006659717 clang::Decl* llvm::function_ref<clang::Decl* (clang::ParsingFieldDeclarator&)>::callback_fn<clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*)::'lambda'(clang::ParsingFieldDeclarator&)>(long, clang::ParsingFieldDeclarator&) ParseDecl.cpp:0:0
#16 0x0000000006684086 clang::Parser::ParseStructDeclaration(clang::ParsingDeclSpec&, llvm::function_ref<clang::Decl* (clang::ParsingFieldDeclarator&)>, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6684086)
#17 0x0000000006685879 clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6685879)
#18 0x00000000066a02cb 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+0x66a02cb)
#19 0x0000000006675930 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+0x6675930)
#20 0x0000000006632f84 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6632f84)
#21 0x00000000066339e9 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66339e9)
#22 0x000000000663b193 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663b193)
#23 0x000000000663c06d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663c06d)
#24 0x000000000663c510 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663c510)
#25 0x000000000662e493 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x662e493)
#26 0x000000000461f2b8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x461f2b8)
#27 0x00000000048dbab9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x48dbab9)
#28 0x000000000485e18e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x485e18e)
#29 0x00000000049c906e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49c906e)
#30 0x0000000000ceda5f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xceda5f)
#31 0x0000000000ce54fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x0000000004664e49 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
#33 0x0000000003bd8e54 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3bd8e54)
#34 0x000000000466543f 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
#35 0x000000000462902d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x462902d)
#36 0x000000000462a0ae 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+0x462a0ae)
#37 0x0000000004631bd5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4631bd5)
#38 0x0000000000cea8a3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcea8a3)
#39 0x0000000000bb6b84 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbb6b84)
#40 0x00007fb4a4429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x00007fb4a4429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000ce4fa5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce4fa5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

```

</p>
</details>

</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWltz27gV_jXwC0YaEryIfPADLUfbbNMmXbnbRw0IQhLWFMACoCPvr-8ckBIvusTeyjvTaSZKJIA4-M53LjggQI0RG8n5PYoeUPR4R2u7Vfr--17w2V2uitd7pgqOvAzFXvOXIS8zVtfMYoPR7AH6SCAkK-uCYxTMd7QsFZtuUfAJ-maPKHjoC0Be9lttLGaami1WElNjuLZCSYOtruUz8rKttZVBQYbIApHFRhW5Ku1U6Q0ii98RWUj520-h_pcvkZd9xoZTzba8wDk1vACRdss7sZjKAq9VLQssFda8pJYXWBhTc4O8bMMl164pf8Xr-vffhdwA3mBecEtFaUCRYG7q3Y7q1_aH1UpuUPDpgbJnqynjKJgjsji2tz-7MU5g1X4bssFKCmMyjMhCK2URWZTly25SafUbZ4efiCxakruGZV1VSsMTc2qskBtgPYtmCUgrOCvta8URSWhtFSIpdsOCDAUZo8Yikiy02iGSQR-KHr4Lu8VPCqPgER9AoSBb1JIBj4-clSh4wDBo_Izrix5h3uzIO4o9YSgK5k8KFCfJr7R0U5EYkRgjQhyMYP702vRDJ9WbeselxWqNhWRqV1Er8pLjRhcfEYLIDK-pKHkxRV727cunbPkJmzrfCYspzusN1hx4wVbhkScJu63zKQOtDySOuG79giyc2xz8Ghyqcdj8aHEyx5XmlVaMG_A7o2rdNMNIaoxiwvmVriU2TIvKAt6lpewZF_WuAlhe5k2Rl37TaqPp7qi9af1BVYAJWBAl1xO-r0qluYY2IH_Sxc6kiR2yyIU8dOPJpvhO9XoS4skGTxRIpFUFcmtb1XZq8GQH-uPJZJ_EE2p2E_MqLd2j4FFIy0s8WUs1eeE6V4ZDP54s8WSyYWxilSrZlgqJgserSOFhI2lltsriyZqpUulJIehGKmMFM80cjt1h8x4zPDG2QMEjI3s8YZBeWpZdIPlAHSKL2uhBeHQpKItTiAj4B7Naa3CsimrDNbbqmUuMyAzyE5khLyNOXH-KIPPbjxsl5AY3uQ8mleDjkCNBiGlEYEQCD3t77_AnYEkxi5Je6JlX03z5poW0zhueGn9Kuoc0_b5SxmpOdy5a5lhI28RO8l-7BSIP3r4FhkjawvZHsPMwDs_Bnpecyrr6KpdiIyGgk1q6RaTAJSS_G4MEGB1IMgCZF0lKEzwH1_mFM_XC9WuD6i9UFiXMlbS8DZ6ZK2n53k5ZBTHouU8jP2jlz9Z5SMMwJBHxWnVKkSOy2CfxKg4npZD1frKRddPBpkZNYwfZDekAh0OBaZyuGa7sVnNarJ5FWb5PuhvfSY_GcMNZjDfGUfBe2OEs7gTHQ8Ekma0DTHNIqu8S6wZ2YmcnYv383QL9vBOYDAUGKU_j9wl0QzqBad_BYurnNE36C92S72jzLSuKDNJMVoqNzKwFZxuviLC0zvvD4TmR15bP1W6n5Ge5VpgpCYtxPHr0077Sh7X5VvHUKtSoCzHvDdUN_Dik-FuzpIEGR7xD5RwLJ4iXTMESPdb5PBPfIAsXIP8SAR3V5wB9rZqSsRvseJoKo-kUAhDD-MOQUaiD6v5I9ZDz4O3TmxEh71EdWqmmVukx-ltZ2SnTWXmQNeM0TXlSnFd1vuXseSF4WTTQxx4NsIWSf6c7PlLqHzUtn1yJNmiGpqVbT8HXT7mAlKyL8zw1474o5uaEzlyp8lKYDFo_y3lJjfkshV3a13KM6lRyP0YZWHtZcSbWApgf9ILqF_B2dr153DY26ywaDC2akzy4YNFmJXQmfZPLvs8gF7S_mMveY6QTO9yUUEdZR2g4IjTwIv9C3mf2q3w7nx_F5G3JAHU7MqIBGXGUzvzZGZ161eG63SOuNF-jYH7m2SFZ35pq-phpeuqmTeHtNqllCdut1VoOZbq1Q_e-L11R_k-oyB9U8ToyzDWuXX46uNiZ_DUKh7RpRWRW0l1eUKj636UYSZoi-WQtvDQIOwWh9cwaFg8NlYReEp8ssqdE9TL5WfTQD6S07vdxZj5TErRov1DLuxLhi4BV8sZe39DVef1sRGaUzNI3kPlneN1NtQa9Oq2TodbUIyy_qrXL2b2s3FfaqudWQdhc_1XI4r15r-d210AUT3xXldS2VcX4-TNL-JnSoS_1MHe7NbxYrB6KvxtXbA3vnVWG25B4FqWBd5WQXkgf1Tan9duH0fvHab0e8MOCYVeVggkLESPpjh-l3tQUjuyjKchwixQHZJ2EPzTFV929NV1_lpbr5lXJj3zqx153buG4bNkPraEaLjqm_BFTsLV-q9MOCBNSnF-bbs7Xyf78Y_kCRjq-yIiv3E-Dq3x92jeOdHX9_giObssC6NmxEIxYYF5cXGXhSVVf-AsvT3eoXyv675p_s_q0NvlJq7r6BaqWT9feNPxNFXXJP-8qpe3SUstvn-mdgp364Vj9yL-e6RdCG_s_z0Hk91LsaL9BeHgmELLl08WXUIfFvfn_plAdmA7qoOIOY39N8sH7wbkq-E9cZi6VHbZsnNWWt03NKdfNALYQOoCDKjZMipzmgyS80LBoyuIMwptja2bvsCVDbBH3Ez4kr5ntszSWSsbP83dZmRv7aYuwwz-oysKUpV7Mh5tzh7RT4-VY6CbX1Lxxim2RHXEPT6Q8xgsarTFj_mpHYWjv3CnTmr7-0mzutvT4fjI7bNYGbWSOX5Qobg2_wdeh90foo3BN8YHquf_kYr6nw3JHy_JXzqzSUDCeVWW0rwUZbTE5eCVbaPHCz7w8Hp5DhXEc8jB1ZFzeLLveJsR-_Iajmbh1l7k_V7sdlcU4Ws_azR2YQptyb8gpENAjx2ohN-0i0Bj1OGC1Yvu97zc_cmoEWxn3eEvh4GFoWFlNhTWH7pE4dwjr9vtdPzySdZnaOU5D-Ln3KqN3Jin-WeVnjBGMDwV51D-5PHf0126za7mka16-Dri8brebHm82WDtXD0duFYXBGv8_u4U70qmots2Rznn7R0PWSOqR4iJrzl70ZO07UDlI1KOB8MClw6orj2aDIqWn2K0qAKdw50SjEoVQj_L30vGzys1lLn5WOWzQB1xcy79H21dUgNndmfzb6Wsd5INJBJo6EodlVBz4eRFdAvzY-z4oAc6s_ZfI_xNJvGn16YjpaEtGazVNaFvJH2qNA2yXOLI27H-8Et-wugBMHeJBTefleZwnIQast5uyEXqcMvRGtyDSIn3nJRM3pBPojwXy0MOrFYxZGUu1XfUUevMUPOxNQUaGDdc0wo3wW9oGxDaTHvwac61hrcgaN8LrtuTHrPXw5iYgdpcX-V6A2xQc-0EIuGrD8eQFW4UN51j0CnKY41CIY81trSWHAIORp3c0m_ubiCyq42VORBa9C6JedlfcB0UapPSO3_uzIA78lKTR3fY-IUVB48QL_IjEiefHHo9YtC7iKCiCJPHvxD3xSOT5XuLFURhF0zzJ17Nkts5jL4qKhKHQ4zsqyinEyVTpzZ27pXjvE-JFyV1Jc14ad4WXkJZNgqLHO33vLjfm9cag0CuFsaYTYYUt3b3fZkT0-Kfe3LyrdXn_xy9ntpq_3JP_BAAA__8nGNQ3">