<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/69345>69345</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: 18: Assertion `isStruct() && "Invalid accessor"' failed.
        </td>
    </tr>

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

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

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

<pre>
    Compiler Explorer: https://godbolt.org/z/Knxhh666z

When compile this program with clang (version 11d07d9ef618497b825badee8b4f06a48575606b), clang crashes:
```
struct T {
  int b;
  int temp1;
} a;

void f() {
  a.b = ({ a.temp2; });
}
```

Interestingly, altering the names of `temp1` and `temp2` can prevent the crash. For instance, the below program does not trigger the crash:
```
struct T {
  int b;
  int c;
} a;

void f() {
  a.b = ({ a.d; });
}
```

The stack dump:
```
<source>:7:14: error: no member named 'temp2' in 'struct T'; did you mean 'temp1'?
    7 |   a.b = ({ a.temp2; });
      |              ^~~~~
      | temp1
<source>:3:7: note: 'temp1' declared here
    3 |   int temp1;
      |       ^
clang: /root/llvm-project/clang/include/clang/AST/APValue.h:552: clang::APValue& clang::APValue::getStructField(unsigned int): Assertion `isStruct() && "Invalid accessor"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -O0 <source>
1.      <source>:8:1: current parser token '}'
2.      <source>:6:10: parsing function body 'f'
3.      <source>:6:10: in compound statement ('{}')
 #0 0x000000000372dc98 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372dc98)
 #1 0x000000000372b95c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372b95c)
 #2 0x0000000003674298 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fda0f9cb420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007fda0f48e00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007fda0f46d859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007fda0f46d729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007fda0f47efd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x0000000006f27ec1 clang::APValue::getStructField(unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6f27ec1)
 #9 0x0000000006fcfa37 (anonymous namespace)::ExtractSubobjectHandler::result_type findSubobject<(anonymous namespace)::ExtractSubobjectHandler>((anonymous namespace)::EvalInfo&, clang::Expr const*, (anonymous namespace)::CompleteObject const&, (anonymous namespace)::SubobjectDesignator const&, (anonymous namespace)::ExtractSubobjectHandler&) ExprConstant.cpp:0:0
#10 0x0000000006fd907a (anonymous namespace)::ExprEvaluatorBase<(anonymous namespace)::IntExprEvaluator>::VisitMemberExpr(clang::MemberExpr const*) ExprConstant.cpp:0:0
#11 0x0000000006fe6fc4 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#12 0x0000000006fe72f8 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#13 0x0000000006fd4f8e Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#14 0x0000000006fd792e (anonymous namespace)::DataRecursiveIntBinOpEvaluator::process((anonymous namespace)::DataRecursiveIntBinOpEvaluator::EvalResult&) ExprConstant.cpp:0:0
#15 0x0000000007037393 (anonymous namespace)::IntExprEvaluator::VisitBinaryOperator(clang::BinaryOperator const*) ExprConstant.cpp:0:0
#16 0x0000000006fe67ad clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#17 0x0000000006fd4f8e Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#18 0x0000000006fdf219 EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#19 0x0000000006fdfe8f clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6fdfe8f)
#20 0x0000000006067ab5 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6067ab5)
#21 0x00000000060bf97d clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x60bf97d)
#22 0x0000000006545fb4 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6545fb4)
#23 0x00000000067c08ee clang::Sema::ActOnExprStmt(clang::ActionResult<clang::Expr*, true>, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x67c08ee)
#24 0x0000000005f88604 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f88604)
#25 0x0000000005f7ec0d clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7ec0d)
#26 0x0000000005f7fa48 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7fa48)
#27 0x0000000005f80989 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f80989)
#28 0x0000000005f822aa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f822aa)
#29 0x0000000005eaffc1 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eaffc1)
#30 0x0000000005ed74d8 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ed74d8)
#31 0x0000000005ea442b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea442b)
#32 0x0000000005ea4b5f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#33 0x0000000005eac504 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eac504)
#34 0x0000000005eacd2d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eacd2d)
#35 0x0000000005e9fdda clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9fdda)
#36 0x0000000004999d08 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4999d08)
#37 0x00000000041fd819 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fd819)
#38 0x000000000417ecbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x417ecbe)
#39 0x00000000042dc99e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42dc99e)
#40 0x0000000000befa36 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbefa36)
#41 0x0000000000be72fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#42 0x0000000003fdaea9 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
#43 0x0000000003674744 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3674744)
#44 0x0000000003fdb49f 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
#45 0x0000000003fa3665 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa3665)
#46 0x0000000003fa40cd 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+0x3fa40cd)
#47 0x0000000003fabff5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fabff5)
#48 0x0000000000becedc clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbecedc)
#49 0x0000000000ae7071 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae7071)
#50 0x00007fda0f46f083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#51 0x0000000000be6dde _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe6dde)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkW1tv27i2_jXKC2FDou4PeXCceE7mdJCiCeY8GpS4ZPNUJrUpKk3mob99g6R8oWI7TqsO9mAHM6klkYvf-tZVNEPalq04wLUX33jx7RXp1FrI628MpBL8qhD09XouNg2rQaK7l6YWEqQXztBaqab1wpmHFx5erAQtRK2mQq48vPjLw4v_5S_rdZIkf3n-refP7O__WwNHpRWH1Jq1qJFiJckGfWNqjcqa8BXycPYMsmWCoyCgfkpzqJIgi_K0yHBcEAqQFVHlJyTK4jRO_KTwcO7heT-_lKRdg8Fml078_j9z2SrZlQo9IS-9sXcQYlyhwgudawWbJtjd89JbRPZX5vezYBRVHs48nB9KI9MCeeGtVsRLbxCZalHYC2-Ql95qqAdCj0K0v--5AgmtYnxVv2r1SK1AMr5Cag2Ikw20SFTIS3wLNfER4XR7jfV1SThqJDyD1mcNlpopWgiJGG8V4SVowfpRAbX4tjMHFdAiLhRSkq1WIPezf5bWchxK6YfpfFoDahUpvyLabZpTanjhvBWdLMEL77xwlnrhLIi0v4OUwjg-F2gDmwKkMQFFHk4t3zhFjOvLLRUeTjVKyih6FR3aAOHb0YF5ttiqh1CKvHSOPuA7yPzYSQc_Xnz3_fv378Mxds1jGoa9ltraoP89QIgolDWRQNEaJOxlhv26b8NkiMqL7-wDE5pW_EIKoTy8qOvnzaSR4v-h1Jd2BF4wXtYdhYM7s8cn_fvzn6TuYKo9MI6xlrUV6oWz_qmHk2N3zcUK1KOxzIJBTT2cddzkPqr1MNTO0KxtQSqderzEZ60dv3VHnGjxHsb3_JnUjCJSltC2QnrYWL8irAY6tQp__nQ3e7xDbVdsmEIEFd0KSWiEVEiJYfZkat0V01JselressPatoPWwwsT4z1H-6hEBSm_KklsPDcSGik0NqCoN7bOH5wi0raiZEQBRbLjqC0la1QP-fFtdPhTz88_90mByFW3Aa7a3o6iMXbrq8MEttWht9yEbMlsJ0p2_KuHFwXj28dosqLfiKwmEZqs0ERoiaRptNxONZ2atmiy0SygyeQlSyak3UzaV67IixfeMq6gRpNHNJmsynKihKjLNWHcC2_PAtOD8yme-mhSlaIWckIZWXHRKla2aFJxMTF8urcffOREjaEm0NQMginT6cJ4ZielTroNka3OnuIrmNg3QZxaAfiIgEQL8LUEPVPn-qrjpXFIXYq1iGonIDwrgNlKKzpOdd5ToE1n8oqGcdMjwXkfuB4OfeS_-NufMMW0zDNk3NHET_va2g-fJePKOMuT9bhsP0iSb0vRKglkY-Jl3geXXfgnXcbDN_5LD8xBHgyQF3lcHkM-r4Hwrnngj2zFSX2YA2qh5Y-LU8NwcGIHZ5JGOM_QXDvcFyjFM8hXC-x_CKe1Xi7r2XPGzAVX8KKmZaMD1Tf_75YI-yXSihK_yssiwj5aLnUjISQsZe8Ci5oVHl68ZMkyiSY1493LZMU7-6BRawmETlsx9Y0uQRRh39EkcpaJMvD9AknCWrhAfqklJ0ZyFPp-4UiOXckJzeIckUJchPxAMsZZnDuSk6HkdGfvi2Wm2JWZujJTqGjyMZlhWNHEkZkdeklS4RTK4Ier2ngO3SNxoOYu1LIiYapXJFzw143oWtunNiZN5Bbx3YsuVOqxK0Shq9vW2W3-gLar1VK9NoAqxululBfOf1TunaHg_NxnUt_zSvQ564Dsu5dGolLwVnl4pp-9I0m_LNWg4MFg2M5MLpi5A34L2oJECfmR6afU15Nz_eom58L0_EcSh06hvmtKmvspeX_NRmrqOg32hrTwvpXuuXJm2bLlhbM_WcvUH6az1gM8nB1YYX__wBaXaBW4WkFSldGheR_VRpmVd_j3ZWNDvsLSLLdslLzABG90w3NUCFG7OrqaaQAf1AkPdEpxlf3TdQoH3hdVGaB-UXCl71v9S6Li0sC-BGQ0AJnmGN4DcEsU-QJlJ1v2DPdc3TD-0Bx4vx7TN-vvp6lLhOnLLyaLXhz68aFeqR-mYR5-2C_2znDDOJGvDw1I6zCHxnOffZD_ZBjMKaH_dMdP_wmOP-hIaIWDfAdy1n7pcY1YZU-ofQnYfAgWsmq41h6P1mAh5MMzyKoW3waMPz71zfZBJc7t5zEbK4Nx11jpFwW3GvtJSorYcXXYkL7hWEP5dSHkPVfHlXhj7_GAW1wOcLfg-kWVp_QM8G27RN_WfHtn6A2P5mX3kyiJxrYLynHVMqgdtdyaG0dxVUTH1ZqV6oEvGGftetHV9c_qNfx3TD2tGo6ebh1OSz8DOKOn1kUnvUHYmB2LvgiF8-O6K9mZPYtfopkF7mjmFO-4yrLEdyz42WzVHHy2uvUbJ66Cb8ZSTUKfKkbVpAfqaBK7mqRQ-vSsJjstHuSt2dE1PjarFMiZUpIVnYLW2cZ53JC6_hNKU9jngwrXGzDEnbHfMJe_Q85Zrx9GhZ1_CPLoasMRoxrA8OsYIBkYoCJR9gMG-E9hfFy2NBkOW-kg8Pw8y8-in_fbljvWbgR99XA2eprowThoswFajAk5i3bRb9AO0R7M0TY_4duOl5SigfH916jg6Oh0SDGQqnI3mE7qeAsV46z33cEExldb3xbyEh99gk1TEwW6I3Q2Ok7M-kQU7KP9Exu_n-mpOOTK3RSPgaYRPR_rmoTfpOiakxQ9NlC-VXVP3vHAfT8VXpRMe6gLIb8QvoJ7zn4BjYYlh8Zg4HJRhIt3aXyQB45nvg63m_Y_XyDejDhrmpn5nk8_YxXTXIzrc5oLhyw8JKuIq3fJ6ouKw9nJYB2dsjcvbUcpmzZEqqmvr6wOR9_gwnCgfxm_26pZ33CL69-g87iOoPV0HCEaEkHx-U7vSTSf4BlqW3EOGXhoyL86-KwG3cUuW32B6mhvsW_4_xC0q-F-0wipTLEbvVRZBR0G3F4X8orSt-XYHBDIhqCtKr_s7akH46B1GsMoz3PqO8ViLij8Bty-H23fiKDsFPS3ticNRsLYQ3AwOu1YFFQ0C5x2bCF1-eH0CMjR4dnVHXiZCy-FsgCXQrvg_fb80lEWT-szss_2CB0VnPYqwrTMc3A3oAzYvSbPu5KdndN05ITTIzuEHjndjl9ARcIElWWw3BDmvq_MpCSvJmnMyzU52GCyr_TuPTxHz4LRsTWw-BwFgoECKa4I2hI-D55MFjj-2nW_aeqj2pg8sp-iZRzbFaSSPZ-oaJH7xX9FCZDcUHIgd3vSYykNq-apjbjdlnNJ6rog5ddlxd00btfu_WYezMVmQzgdBu9R67WqHycavTqpnW3zRyUZX_XFwZp2N2G5LF9egsBeFKRl5bI1w3sWncH6xlJJwlS7fTwQR-pax4F9_-2f6yGzffqe7XZf7RQPpzXZFDoLp3uqcLY9zPG7KI7bIxwexEij6MAUx45b2CdfOv5IKqhfHTrPm27UUyUWq-Pz0cC5iih32sX_OucYtJonvSB2iSNhksQniTNWI29q4pZNJ3UPJuoBp95wzwydOS3M6F879Ao7rpQMGIn8kn6Ukd9F0Z6m43dR6Fd3h45z6XjnAQ1h2vjmVMvlDPZu8ot51DQ5PKYDHouqOulZtwefndbgSE9wiv-_kccxk5klxmEuGxTwEmhpUW57kC1yk0RmfQp4vzyP2HVoTA5op-PzCaR-GiANd7xVrdDDVWN_cJ6t8rMQLZc1K3SuJVItDyBcesIt8rPQWWXYUSWUArLyx-RUi92tu_XK_al7cwdVfS-Pyt4_7ZFr-9cj8MK0xSmgIIw0tK4FNHlGSqAWALGDNjsfnP2_otchzcOcXMF1kORpHCdZFF-trxOaBhFUcRAlWRkkSRAQkhG_gDwOqzgortg19nEY-EEaxGHkx9OU5jmkYeLT1E8h9b3Ihw1h9VR76FTI1ZU5yn2d5GEUX9WkgLo1f3yDcU8H9uLbK3ltDoAX3ar1Ir9mrWr3EhRTNVzvSAqysY6uX3Wyvv7xs-lGp38HAAD__2ptD2g">