<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/146818>146818</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Assertion `isLValue()` failed in `Cl clang::Expr::ClassifyImpl(clang::ASTContext&, clang::SourceLocation*) const`
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          Rush10233
      </td>
    </tr>
</table>

<pre>
    Probably goes back to clang-3.1: https://godbolt.org/z/4qTWPhrWr

Generated by fuzzer.

Simplified test:

```c++
template<typename _Tp> class complex;

template<> class complex<double>
{
public:
complex(double =0.0, double =0.0);

private:
typedef _ComplexT;
_ComplexT _M_value;
};

inline
complex<double>::complex(double __r, double __i)
{
__imag__ _M_value = __i;
}
```

Stack Dump:

```
<source>:9:9: error: a type specifier is required for all declarations
    9 | typedef _ComplexT;
      | ~~~~~~~ ^
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ExprClassification.cpp:57: Cl clang::Expr::ClassifyImpl(clang::ASTContext&, clang::SourceLocation*) const: Assertion `isLValue()' 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>:16:24: current parser token ';'
2.      <source>:15:1: parsing function body 'complex<double>::complex'
3.      <source>:15:1: in compound statement ('{}')
 #0 0x0000000003f78848 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f78848)
 #1 0x0000000003f764d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f764d4)
 #2 0x0000000003ebb048 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007398b3242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007398b32969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007398b3242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007398b32287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007398b322871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007398b3239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000000000781a886 clang::Expr::ClassifyImpl(clang::ASTContext&, clang::SourceLocation*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x781a886)
#10 0x000000000781aa5d clang::Expr::isModifiableLvalue(clang::ASTContext&, clang::SourceLocation*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x781aa5d)
#11 0x0000000006b4481c CheckForModifiableLvalue(clang::Expr*, clang::SourceLocation, clang::Sema&) SemaExpr.cpp:0:0
#12 0x0000000006b79dd7 clang::Sema::CheckAssignmentOperands(clang::Expr*, clang::ActionResult<clang::Expr*, true>&, clang::SourceLocation, clang::QualType, clang::BinaryOperatorKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b79dd7)
#13 0x0000000006b7b38b clang::Sema::CreateBuiltinBinOp(clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b7b38b)
#14 0x0000000006b7ca91 clang::Sema::BuildBinOp(clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b7ca91)
#15 0x0000000006b7d016 clang::Sema::ActOnBinOp(clang::Scope*, clang::SourceLocation, clang::tok::TokenKind, clang::Expr*, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b7d016)
#16 0x00000000066a31f0 clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a31f0)
#17 0x00000000066a6699 clang::Parser::ParseExpression(clang::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a6699)
#18 0x000000000673a479 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673a479)
#19 0x0000000006731e28 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6731e28)
#20 0x0000000006732c4d clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6732c4d)
#21 0x000000000673ab73 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673ab73)
#22 0x000000000673b33a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673b33a)
#23 0x0000000006633bd3 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6633bd3)
#24 0x000000000666987d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x666987d)
#25 0x00000000066276be clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66276be)
#26 0x0000000006627e69 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6627e69)
#27 0x000000000662f7aa clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662f7aa)
#28 0x000000000663077d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x663077d)
#29 0x0000000006622aea clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6622aea)
#30 0x000000000492ed48 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492ed48)
#31 0x0000000004c28c65 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c28c65)
#32 0x0000000004ba5ffe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ba5ffe)
#33 0x0000000004d1b441 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d1b441)
#34 0x0000000000d8e81f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8e81f)
#35 0x0000000000d853fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x0000000004995b49 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
#37 0x0000000003ebb4e4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ebb4e4)
#38 0x000000000499615f 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
#39 0x0000000004957f8d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4957f8d)
#40 0x000000000495901e 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+++0x495901e)
#41 0x00000000049614d5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49614d5)
#42 0x0000000000d8accf clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8accf)
#43 0x0000000000c41924 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc41924)
#44 0x00007398b3229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#45 0x00007398b3229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#46 0x0000000000d84ea5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd84ea5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWktv47iT_zTKhbAhUe9DDo7TnunZDJLtBDNHg6JKNjcyqSGpjD2H_ewLUrL18COd3rgxwN9wAlkki7_6VbFYfBCl2IoD3DrhnRPe35Bar4W8_Vartedi37_JRL67fZIiI1m5QysBCmWEviItEC0JX038qef4M7TWulKOP3PwwsGLlcgzUeqpkCsHL_5x8CL46-XPp7X8UzruzHFnvwAHSTTkKNuhov7nH5DTpuSZbaqSFQxypEFpI9K-dyK3-VIH35mvO9OwqUqiwfHnelcBJxtAy5fK8b8YbEohKjZVCVvHv2tk9BqcqDTPRZ2V4PhfTO3YtKnqrGS0wbCvh5OmHnL8e3fqOniORi_SQ4eVZG-2P9v7roIcCrScN5JemmqHn2j5-_KNlDW0zeP7gxzGS8ahB6IP1p85_jG65VL2oC2XzODa67Vcsg1ZLZeHLg12W-nQdY_x1jDa2P2-3lTHNjHP_lyJWtIWUtr-IZBSSPNAkCEAqQqoMa9ETCEJf9VMQo4KIREpS5QDLYkkmgmuHHeGEEIpcuI5OkMesh9T4X-bD3JCYz7rm62j-DPk4IUUQjt4UZZvm0klxf8A3f908EILUSoHL9pmi5JlDl7Mnl8cvPiyreTceAorGLXIprQyHISxET0vm4HQmMFUbp7aJruvm6p0cNKrM3t-mQuuYasdHBkb9cqeLYUPounIwTMHp4gKbgcCmikF0hQgJ3KZevjDegtOjGlxjArCSsjNOHp6-DJ7_oJUnW2YRgRl9QpJqITUZuCOxirT6zqbUrHp-BixxJSqwfCDCM8R47Ssc0B6DYhKotY2ImhJKBhtKgmVFBSUghy1LoHntiVRSlBmh72sOVJUskpPD76VH3zLnTpu-iTFSpINInJVb4Br1VpSVAaTcXhWgpzAtiqFBLk334TsWVITLWv-6uBFxnhnXeMUaLLK_yaymARoskITYeSSqjLSa13VeqrQZGNYQJPJNokmRG0masc12Tr-PeMaSjQpuJi8gcyEAlOOJs9oMllROjHeRNeEcce_v4jXVFacVGotNJoUVJRCTnJGVlwozahq-rAcD14Pxpo78wxbo_HnRY4_w4GhjNZSAteoIlKBRFq8AkcOjs0IwrHjzvCp9qH5Z5qbZoyvUFFzan3PTAmm_fuxyAj3Lwpn3MZfUfMcKU00GEMj69KxCVXxvXmwkQs52HeRu3X3H7-IkyRIkPVZ27HaqebhSTKurVO9NG6ZdJUk-XsplJZANu34Y1ybYWZ7_RTvcvCdu23hdeC9EfgoyINT4OclEF5Xj_yZrTgxwaPmdpbOUSlMF9eAasB0UPEAKmSZGyRobvzwG1DxBnLXYPuV8Lw0PSYth4M6bZRrw6Vr_xr5fis_9tMk83GAQ-y2SjWhd5tEyyiYlIzX28mK100BnSoxjSxk26QDHAwFplFaUFTptQSSL19ZWX5Mum3fSQ_HcIM4QitlKfgo7CCOOsHRUDBO4sJHJDNx-kNibcNObHwk1ss-LNDLOoHJUKCfQhp9TKBt0glM-w4WJx5JkujnzKOfPXZa8G12hX3PHatGwvy0akz9LnJWMJKV8PDWzuX_SgVJmHcKDuJYlAVB4lE0XwN9XQh5WSOru8F6UZdhIWyIVT9F5tFIGAUUgwkPMcVpnsdHUhp_MkBndtlj5prHCiThufoenDM7_30DVZfa8een62tZ21nuXYsNCv-7JuXLroLR6zvGidxZjFrI_2I8v0L0b-nqDOyPyMz8JDtDpgSi4a5mpWb8jvHHasjjRZ1PKTc_GilHVui9zYQor0OIUbkjJBgRQknqnSbEUJGfIoIKY9wPef6_mR_DQMdPOOInd73oND8zqh9POsoP8KPFa_PwYjLaj_NzDV6M5h0v0YCXiPhe4fahPNmMvPf87dfnx6Kxu4EJSlm1kx8OQgPNKwm0eXqAN7iKZzQ6dgzEIwaiKE0vMnBObRMc50SZpF7DdZAbbB3yZIA89kkQv4_8eb-EGYI_qps_640-zO2fr0wDt1MmHSnjAU4uKnNQ5FHed1sys0KDnGktWVZrUINl1fOGlOUfQLWQQ7c0qrZuiYP65NT4Dj_vJT7HsvI-yJO9jWtcwwaG5YMNsDuyAaZB_gM2-LeQfg3CDCUdYd54BGaxf1GBebuTcCDuTuQ7ByfXmgYbSB1gPAKc-T65CHjRbqmMAffaGMufcfKBrzTz55Uc2SjSqTlMDyPfz_LLdtmreQ8F40wfxfanZodp7-RCfo-zvrR7-V95Idod0outHoiGbuQ_MKWv5MYNIR1dw-QxitIkvjzuDQ-_SFFXZ1l6roAea9vxd3oQf2dkPMvydy1Cz8pbCPmN8BV85exqzFtuO-aHaWmE4yiDd5l_lD13_co1yGYP7v8_xRzVuGjNGaWg1PP-tOQqfFlGOr6iMV8QXU55etPSgLazo_zTWTteov8M1iDqcis8SnFxEZPLUf_LtnGq4aT-E5i6BhdG246LZDQ1uPE7se5FVHYt0kxzfRIeK_JXDU96lNgcguM3KE5vsxzWmr-LvC7h66YScr9suMr82KjZkZCOHAITOHYIe7aYnNrn2i_br7d8byAdAA9PVYIUQx4MVgdzkcMvwJuV536tCbTW0L6yae5nw2yBdDAH-WBAcUKjsA9zIc20x_MTOK-EsMHQIRwkgEFGwqKAIZFNn1-50oRTOM3leZWu4r8tzk6LQX4X5F4WBN5wA8Xi7ZR5OyQAySVlrxKCWnwd-kG65eYJJF6BKPWWG8KGi6eZlGRnw8icroncJ5Gz_cbJ4B2eozfB8uso0aDsdAhHOoR-QdCe9rn3YuPC6WWgPSY5pZCNLF0TI6NNE3vZc4pyyd7gxA67Hw2DRBpmQWop6QndHxEvpWXVlrbXEw5nw6QsM0JflwUfBvam49Z15t5cbDaE5-NRfNJ6Srf1RGV6J4aAHjlaMr5qp4vGtIcGyyXdbj2v-ZERxehS2eothYPK5sVSS8K02hePxJGyNEOhWYy35aZKbzN2cKHDfHFckk2WE3vOvacKJ_uT3t9EdsIY8fh8NoD-UfKpU9im5FvNn0kB5W7A5WW7XeG8uUHcOXwycq7ICwv0n-wchvFpRaS298nOeEE6ZC2MiyQ_y5q1GjmaGfdUDkL3qKGpcG6JfaHqbJDOXOl0slX74ErBKJkJU9eDj5Lym8jUeUZ-E9kDU3rAyKVYfPCAijBjfHtV4vtJbN3kp1BpyOqoHCZcaeQFeXgO9n3veZAgnMgMzpngJ1J5hWzV0tORh0dzOKG0DWn7TGQP3oaSWRsI3p-hPz33MMg63IPsz6WBl-IAGcSf3XEjuut4dIUHp3n6wTtBtkknMBwLhMBFy6Vps1SaSL3sqfXdXUDQ6yIaGTkAEqJG-OfbyQhvuu6X9a_Y2veoaBcNiLb-39wLRX8zvUawZcadckCeHxiMtQI0eUNaIAWAWC-ZT_s3fG_yWz9P_ZTcwK0Xh17oJWmIb9a3OMSpF7ouKYibuVER4xxiNwkx9ZMk9IIbdotdHLqx67uhi308DZIkjcKswD7QtEgDJ3BhQ1g5Nb4_FXJ1Y--b3npBlHjJTUkyKJW9oI5xqzl2wvsbeWuvqWb1SjmBWzKlVSdCM13C7aULs5G7J4bZ4p92kTdyb2pZ3v74LdyWmLdb_H8BAAD__ycfqLc">