<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/67317>67317</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Crash in Clang 17 front-end for code that previously worked
        </td>
    </tr>

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

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

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

<pre>
    Hello,

the following code which is a reduced test case from C++ Insights (https://github.com/andreasfertig/cppinsights/blob/9147b894b814a3d7dcf82ac9b16965680baffeb1/tests/FieldDeclArrayRef2Test.cpp) leads to a crash in the front-end with Clang 17 while it worked with the previous versions (https://compiler-explorer.com/z/c51Gxj7b5):

```C++
struct array
{
    int (&data)[2];
    array() : data(*new int[1][2]) { }
};

int main()
{
    array a;
}
```


```
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-17.0.1/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0 -fcolor-diagnostics -fno-crash-diagnostics -emit-llvm -Xclang -disable-llvm-passes <source>
1.      <source>:4:36: current parser token '{'
2.      <source>:1:1: parsing struct/union/class body 'array'
 #0 0x0000000003349f18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3349f18)
 #1 0x0000000003348044 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3348044)
 #2 0x000000000329c028 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fe7b1587420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x0000000006950cec CheckEvaluationResult(CheckEvaluationResultKind, (anonymous namespace)::EvalInfo&, clang::SourceLocation, clang::QualType, clang::APValue const&, clang::Expr::ConstantExprKind, clang::FieldDecl const*, llvm::SmallPtrSet<clang::MaterializeTemporaryExpr const*, 8u>&) ExprConstant.cpp:0:0
 #5 0x0000000006950b31 CheckEvaluationResult(CheckEvaluationResultKind, (anonymous namespace)::EvalInfo&, clang::SourceLocation, clang::QualType, clang::APValue const&, clang::Expr::ConstantExprKind, clang::FieldDecl const*, llvm::SmallPtrSet<clang::MaterializeTemporaryExpr const*, 8u>&) ExprConstant.cpp:0:0
 #6 0x00000000069623bb (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
 #7 0x000000000696e927 handleLValueToRValueConversion((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::QualType, (anonymous namespace)::LValue const&, clang::APValue&, bool) ExprConstant.cpp:0:0
 #8 0x000000000696eeae EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
 #9 0x00000000069700b7 clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x69700b7)
#10 0x0000000005a8eeb5 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5a8eeb5)
#11 0x0000000005ae6f63 clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5ae6f63)
#12 0x0000000005f632d2 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5f632d2)
#13 0x0000000005cb9fc3 clang::Sema::BuildMemberInitializer(clang::ValueDecl*, clang::Expr*, clang::SourceLocation) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5cb9fc3)
#14 0x0000000005cddcef clang::Sema::BuildMemInitializer(clang::Decl*, clang::Scope*, clang::CXXScopeSpec&, clang::IdentifierInfo*, clang::OpaquePtr<clang::QualType>, clang::DeclSpec const&, clang::SourceLocation, clang::Expr*, clang::SourceLocation) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5cddcef)
#15 0x000000000590d942 clang::Parser::ParseMemInitializer(clang::Decl*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x590d942)
#16 0x00000000059114b8 clang::Parser::ParseConstructorInitializer(clang::Decl*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x59114b8)
#17 0x00000000058d0fd0 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58d0fd0)
#18 0x00000000058d093d clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58d093d)
#19 0x000000000591ec68 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x591ec68)
#20 0x0000000005920dd1 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x5920dd1)
#21 0x00000000058f15b4 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58f15b4)
#22 0x00000000058c519d clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58c519d)
#23 0x00000000058c632f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#24 0x00000000058cda8f clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58cda8f)
#25 0x00000000058cef0a clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58cef0a)
#26 0x00000000058cf470 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58cf470)
#27 0x00000000058be922 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x58be922)
#28 0x00000000044f8b05 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x44f8b05)
#29 0x0000000003dd5f21 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3dd5f21)
#30 0x0000000003d5b9fb clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3d5b9fb)
#31 0x0000000003eb5c23 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3eb5c23)
#32 0x0000000000bd50c5 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0xbd50c5)
#33 0x0000000000bce42d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#34 0x0000000003ba7489 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 0x000000000329c453 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x329c453)
#36 0x0000000003ba76a9 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 0x0000000003b6f477 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3b6f477)
#38 0x0000000003b6fe2d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3b6fe2d)
#39 0x0000000003b79d0c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0x3b79d0c)
#40 0x0000000000bd2d31 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0xbd2d31)
#41 0x0000000000acf511 main (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0xacf511)
#42 0x00007fe7b102b083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#43 0x0000000000bcdc2e _start (/opt/compiler-explorer/clang-17.0.1/bin/clang+++0xbcdc2e)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```


Andreas
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWltv2ziU_jXKC2FDou4PeXCceiazLZptgkHfDIo8sjmRRS1JJc78-gUp2THlS9KOOovFbtHEjnj7vu8cHh5SJErxVQ1w7cU3Xnx7RVq9FvKa1EwCUSVIzVdXhWCv179DVQkPzz3_1vNn3W-9BlSKqhIvvF4hKhiglzWna8QVIkgCaykwpEFpRIkCVEqxQXMP33j4Bt3Viq_WWiEPZ2utG-WFMw8vPLxYcb1uiykVGw8vHCgeXtCm4X1LDy-KShQeXuRBlBZZHhVZEJGQpYyWGSY0L4IkT-Ik8wtSllAEHl4YNKblgkPFboFWMynJ6zco8SMoPaVN4-EcVUCYQloggqgkao14jSxbKWo9gZqhF67XaF6ReoWC1NCuAHGNXoR8gr7UNGgkPHPRKvQMUnFRn6BLxabhFcgJbJtKSJA9879NWRz8tv0rLWIP56bBgfhe4nf_e0G7p0rLlmpEDKm-XtoXIYQQr7UB4OGEEU1Mp_EN9uJbLzyo1DU2tXLkhTPUVc08PKvhxXThxTeBadS3NdXSG-Slt7sR3_rrfpthN4TXXacncNkhEXlrtu9rx9Khfqro_vOn2cMnpNpiwzUiqGhXSEIjpDZ2vOBhVfW8-5g0UvwFVHt4wZVqwTgKIjVDvKZVy8CatHOIgtAnLQkFD8-NlRspKCgFDCnRyu6xaUmUEpQTDQzJtkaKSt7oaQf5QRP6hFi7afa29aeen99LsZJkg4hctRuotQGOPLwQjT7lL-aZccRJkE79qXHywkjdPexn22TFXogsJxGarNBEmN6IcfWFaHXT6qlCk41RAE0m2yyZELWZqNdak60X3vJaQ4UmD2gyWVE60UJUdG2sGd5eBGUqB-EUT300KamohJwwTla1UJpThSZlLSZWTPcxbLiedFi-WwpowrgiRQWTzkZEKVDIC-e90uGnTrvAaOc8DmeRF87CxOhHWymh1qghUoFEWjxBjTycGj_EadcDPtFD0P_YhibOdVPMw4u25qLXWSlkoqTpr589fY_Iw6GP_K2_-xeGUV4GGbJeF868cKZeVfflXvJaW5947Bwre6skyctSKC2BbDycGOcy89DMPDOl_oFnePjG3_ag9nPToA4GqDM_ik6hnldA6rb5Wj_wVU0qD2dtbRcVhiphRhkPo4HgYMQORpxTH2doblzqG1DxDPK1A_U7qVllhsp61Zw6c1Fr2HaxP5z59mc_RNgPkZaQFkGcpRH20XIpQWkhYSn7eLqouFmItlmyTKJJxet2O1nVbVfQ6LUEwqZKTH3LJYgi7DtMokMmSR77FCiar4E-fXomVUs0F_U3UG2lPZydfP4fvGbGLzyckVrUrxuz6tRkA6qxzpR35jLN7upS9F7UqWxLHqzTfxbUdjoo_M-WVI-vDQwez-7_JFULiIpa6eMuP20b2XuJqUBqbZ7skB5U3K_Gu55mpsKbtz1sSFXda_kA2gvnBw2_EA2Sk4r_DY-waYQk8tWM4fSTtWYqG3Q5MoU7MKctHg9NUYTB_5vif8QUiWuKBIdF8a6qW7Ms64e2EIVZy3dzvwuj1j5L_doAKnnN9rW8cP6z_X6yAeAnLX0k0Ds9zcWmqUDDV4vBMfY7LffAb8GEZ6KF_JHm5-h_1JTpwJSQ4xStbSefreM-im_2cy7qPlceVdczE-idAT5fnFP9lOsLCiGqj2mRDbUAAqgPIjBT3_pefw37Q9AfAZu7YFPfL9LTgWXHYCHk12eQZSVePJwdDv3w2K-1B4rm3fdxkoQe39smA4eBk37FJAMoYifYwob0k8sE84WQd7U-TWCg60iZTY_JAR24oCEpk_AC6F1YYNYaR5iPveB4hdm570iULGKHkpOsxWUSYoZPU5pR_bVe8Jqr9aKtqn_Kafg5FseOgsMxdDjSIi_pGbPdtLxiX2BTgLyrue7WzQFNO1HNUnzM9WMKjMW0I-IwjVymjFEoLzM9S_M0wwcqTIgePp5__25LHhqgx4HvjkGtecmNqCYwDlt_bch_tXCvpZu67FcEs5g7DQw2M9S5JeBipvYvG8nawDGSk8rGuc_yyJly93YvfPD9Q2YaC3CHxwGcuICDICqyi4Dt2mX24-L8NBofuMXlAHfSmzhjfsn8i8A_wxbYF9BrwW6N1bIzlQ_q9cvlOBw6iA6HbMghD9kPcFDnSdx3Ryfziig1Nos8ZA6LfOBCQJN3XOj79y4Om3nOS76bl9lHp_nFQjsEm2ktedFqUH0I2Z-R2AOJo5AzsrsaDQ5Fwm5OlGOfseCySMZ0vUDD-aXFU_flUTxBfWJLeVGgXYQ9jq1HIJjZV1ZEgwnuZ5NySsGB-rb8n-l7h6DPTT9iwNFMY5V3TONmflkZxEV0URUDn0gr7Z61Oo6Av1jjn9d2F-iIhjetP_NTe5e7TVNxyrVZq81-aN_raPHEyu3Yw01bMxoH-eWoaCh_lYu2psYkt1De1RpkdzT6fmD44Rq8Xp0375GhRhPK6uAIFQ6ESkJcftRxHb24WciHEfiXyHW0Nz4p17QhUk_NWok6DscbZcM_GvBnJLvM_9O284sDHf4dzuM5geHoOEE8EAFKn1wU4VE0n-EZqm7Vy97P1U3F36Rom29Q7s4S56d3Hl8Eayu42zRC6gdNNIybe1hyDvtkwL6M0stZ4IJLpf83S2AYOhIMEuECcny85Zg9PA7yKwP48Bht7L16B8RB6qS7UVRmhe-cC80Fg9-gntmwtNvQAW019I_6N-Rj4OuHd_A5iWzIWFxiJ0dbSLP61ewEwDGh9SMfQhu80WRxkZeFK1032J09WKRwWr3zXEb00R6dA999tQlFTHHo7tst0DcWz-LUpuCI5YixtUflwHYyEb9gsU9jRGmw7K9WvL2j2d1pMWFjTQ6OLPvzDecZnqNnwdmY6DtsDvjQBU8hwgzthJ4Hj3a2Z4PXTH-C3dhvmuokk8R9M2X6OHW-zCR_PrNou-9dw4KkUZZbOQ76LfvUZCmtora0v8libwh44YySqioIfVqWtRuqu7F7f5kHc7HZkJoNJ-tJyynd1xONGZ0YDQ700ZLXq34B6My6b7Bc0u02CLo_CqI4XSpbvVfRqWweLLUkXKtd8aA7UlXG_4U8KDdVZm9herY_x--aeDityKZgxMPpm1Q4290I-EMUp-0RD9_oR3F4YIpT7-27km9t_UBKqF4dOS-bbrTJ2uF0_D0ZOlZCcvR_2TEGmfRZD0hd4ZIyStOzwlmLkaP1b6emE64HDU2Fc_vbC1Vng7d9I7686sk6bpQN1QDMflSNP0ShzkvxhyjMZtuR4lIY3lu_IdwY_vgA66J6vYv8Sg0BOxtT9w1mWKQ58-k5vLcH35004MT6f077f1HDsQJYJ8qhapE_yDYwC_v0c5dv7FDbwDE7uihybjkeKcMweBzATlbnE1rGQWBvnY4zYtehMyJ27ob5uPCzEC2XFS9MXCVSLw-Gv3RBjE6VmCZ2GBz5mbOSRMPMiVEMqOt_JC1tl_sxD4vDGQIpTYCfdbbvbkCD9cbOK0vCq92NZ9hy3d0DD0Jr6FYBmjwjLZACQPwgke4H2-XQSIJuZQ1mXpjG797-nXX3wq_YdcjyMCdXcB0keZxEOA2yq_V1WWQxCcu8CJkf-2lIcVYUaZJlkZ9EKYuu-DX2cejnOA6COAiTaRr5KU6TqAhIAThMvMiHDeHV1Lj0VMjVlb0TfJ2kYZBeVaSAStl78xj3kmEvvr2S1_aWatGulBf5FVdavfWgua7ger67Ur6_P_52r7y013LsVWOi99fHq9f-ZvlVK6vrn7_MbLH_dwAAAP__HPp-Ww">