<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/107842>107842</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang crashes on incorrect code with Assertion `!KnownValid && "unhandled case in overloaded call candidate"' failed
        </td>
    </tr>

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

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

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

<pre>
    Reproducer: https://gcc.godbolt.org/z/vKxnExzfz (assertions trunk）
```
#include <iostream>
using std::str;
char a[10];
int main() {
  str(a) = 'a' + 1;
  cout << str << endl;
  return 0;
}
```

```
<source>:2:7: error: no member named 'str' in namespace 'std'; did you mean '__NSConstantString_tag::str'?
    2 | using std::str;
      |       ^~~~~~~~
      |       __NSConstantString_tag::str
note: '__NSConstantString_tag::str' declared here
clang++: /root/llvm-project/clang/lib/Sema/SemaOverload.cpp:13552: void AddOverloadedCallCandidate(clang::Sema&, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool): Assertion `!KnownValid && "unhandled case in overloaded call candidate"' 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 --std=c++20 <source>
1.      <source>:5:8: current parser token ')'
2.      <source>:4:12: parsing function body 'main'
3.      <source>:4:12: in compound statement ('{}')
 #0 0x0000000003b258d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b258d8)
 #1 0x0000000003b2359c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b2359c)
 #2 0x0000000003a6c198 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007d62dd442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007d62dd4969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007d62dd442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007d62dd4287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007d62dd42871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007d62dd439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000007001b67 AddOverloadedCallCandidate(clang::Sema&, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool) SemaOverload.cpp:0:0
#10 0x0000000007001df9 clang::Sema::AddOverloadedCallCandidates(clang::UnresolvedLookupExpr*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7001df9)
#11 0x00000000070020fe clang::Sema::buildOverloadedCallSet(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::OverloadCandidateSet*, clang::ActionResult<clang::Expr*, true>*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70020fe)
#12 0x000000000700e7e5 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x700e7e5)
#13 0x0000000006bb53a8 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bb53a8)
#14 0x0000000006bb790c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bb790c)
#15 0x000000000663319d clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x663319d)
#16 0x000000000662bf31 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662bf31)
#17 0x000000000662e08a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662e08a)
#18 0x000000000662e229 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662e229)
#19 0x0000000006632759 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6632759)
#20 0x00000000066b3d89 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b3d89)
#21 0x00000000066aa870 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+++0x66aa870)
#22 0x00000000066ab7a0 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ab7a0)
#23 0x00000000066ac679 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac679)
#24 0x00000000066addfa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66addfa)
#25 0x00000000065c1d03 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65c1d03)
#26 0x00000000065f738d 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+++0x65f738d)
#27 0x00000000065b59be clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65b59be)
#28 0x00000000065b616e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65b616e)
#29 0x00000000065bc6f7 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65bc6f7)
#30 0x00000000065bd5cd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65bd5cd)
#31 0x00000000065b0bba clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65b0bba)
#32 0x0000000004470d68 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4470d68)
#33 0x0000000004702ca9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4702ca9)
#34 0x000000000468655e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x468655e)
#35 0x00000000047ec0ce clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47ec0ce)
#36 0x0000000000cb996f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcb996f)
#37 0x0000000000cb2bba ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#38 0x00000000044b4189 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
#39 0x0000000003a6c644 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3a6c644)
#40 0x00000000044b477f 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
#41 0x000000000447a6c5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x447a6c5)
#42 0x000000000447b12d 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+++0x447b12d)
#43 0x0000000004482d75 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4482d75)
#44 0x0000000000cb6d65 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcb6d65)
#45 0x0000000000b89614 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb89614)
#46 0x00007d62dd429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#47 0x00007d62dd429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#48 0x0000000000cb266e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcb266e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkW19z4jgS_zTOiwrKlv8_5IGQsDe72ZvUMLevlCzJoIuRfJKcIftwn_1KkiHIASbZi6f29qiZCuhP69e_bnW3hUBKsTWn9DpIb4L09gp1eiPk9VLLR3pVCfJ8_YW2UpAOUxnEM7DRulVBPAvgIoCLNcbTtSCVaPRUyHUAF78HcPH0y47f7X6vfwcBLJBSVGomuAJadvwxuFsEN_OgKIPwNghnQRb2_9xHGDOOm45QEMRzJpSWFG2D-M51d4rxNVCaGATxTGkZxDeuC2-QBChIb6IwSG8PzYxrsEWMB7AIYAmCvG8HwEyGBbKt8S0IYI4CmIMA3oDoMB0ALDptsATx3EzZv6WcNEejJNWd5CA8NAX57WkFTzbGcyU6ialRNJ7BIJ7lhmwqpbCscwG2dFtRCTjaUmLAWvg5YNw2qRZh6ppJAPMgvgGEEfAsOrCliJue1ervy7ngSiOul1oyvl5ptH4h0sxa7PUBAIIgn4MLhAP7MoP6d-ndv93rdP_31reTuNDUKPwmvIBQ3CBJCdhQSXs3aBBfB_DG_LNyFlIIHcBF0zxtJ60U_6TYfOzHLRpWBXCxpFvU__n8RGUjEJnitg3iWRSnqbEHeBKMgBkh-35K5qhp5ogTRpCmASycSIvPycsCOAdHrbcUNzOMqVIPiMlB51e6bRuk6Uyuuy3l-p4p_YnXIoAzM9LAdwNnUqLnL7QO4vnR9LtdK83Q-G4gd4_3gHRJdQ-tEqJ5-VsaLWf73QqMc8LoFy6-8d9Qw4zPZQHMQABhxzeIk4YSgJGixgXFgRSAUdMA_EILNIaqEWsomToTPdzfzZZ3QHXVlmmAQNWtgaStkBpoMQwwTG-6aorFtjfha0sypTqqArgAiBOwjx56QwGWSG1AhfCjlghTo2orTTQzJqAE9HsOzu1MpJTADGlKgOw4UFiyVveQlxrhR0C6rXEJ1xROg7B8kGIt0Rag3miq9znRWh8T25Y1VE7orm2EpHLvd5OXoDhxQREuKhOjFkfuCyZr8g3JepKAyRpMhJGL2tZI73Tb6akCk63hAkwmuyKbILWdqGeu0S6IbxnXtAGTmovJE5WVUNT0g8kSTCZrjCdaiAZvTFyMby_iNYMVR63aCA0mNRaNkBPC0JoLpRlWbg3LtN88sUHjFjtlYAi8IGcpjAyFg9iXBvGsMCziTkrKNWiRVFQCLR6pDWPGUWHuBMATAhKzae2ONTNN9Ko7jq1Lm3RmRLh80MuIL8pgHBhWRMcJUBppaqwMbDLJTS7Jb3tILuQFMA5BuAv3r7iCaUGKo92rnpV78yCZiWsIP351zlm8DJLo22qf-txWZVzbRGUW_hDvCuBNuOvhefijAf44LfEp_POGIt61n_mSrTlqAlh03JYSBDTCrDIGWgPGQws9tCjDUVmAufHGLxSbqPTs4P3NBiyT8HsmvTFzwTXd6T7kh_b_YYm4XyInGSQkSWBqnNmq5pLHrshWWTJpGO92kzXvXAeeKjHNLHA7xYOd-DLLrKwxaPVGUkRWj6xp3reAne8tkA5BJ3kG1spy8V7wSZ55sjNfNizyOgaoMvH7XZLtRE9y_kpyVL1bZlR5MgtfZlzSMnufTDvFk1kee10ehlGV5X_t2gCcKI2O9omJG-GQFFKXYKi3Q3mWKeVT9Q8uqRLNEyX3Qjx27V6RUXX-8LjVc3HwIENWNCALhjU9TVbVsWZAl0XsuRQWLe2JOcGB3_omUn_tNKoa-k5ulzaH3guMDC9vIn6IbmZT9RequkafXhXOzYOkzdTm0xjmMtbwzAUH5qI5TU-b6-a1uRzwMex1kfpRjXkEYhgpPt4chm3PHPGxObKqSmNUXDDHBxjhL0tvz55HbzKgNy9DfCaSY_2Z_w_TOwadhi2PztSjM4vjqCTHaB7sE87R-wehdM12BiVVigm-7Oqa7Xx-3xcoP15Rp4enaOYrCqs6ji4qOkdKv2jp63c82Iyzn39hnLzeFMNa6njq1-fWLrPUthAbTh3FB5zmHjX5gBoaFmhcav5UfBh1PT6KIR8Qlhf5mNlzalP8voWVgZajqAShX9KVg20O8_SySn8ORSzOY0Vg6CtSxaT4viLL_eHIeV3se7LUW90_b4-ij4Xr6RP5-iBU5OFFfQ66fJa39oTZ5pBZramcaS1Z1bknlZcctdyipvmNYi2kH4uNtn0sjmFnQ_GlaHWCootZbZhH3fxjkCdXG44YwQyWZc8McGCGKkd_xAx_Ft7H4MxQ4nEWDzjDWX55K877w8oDdzeCPAewGKt6dJA8zMkAMyH15VS36M9nh5gHpyNnvN3zGFdzjuTRRhFPU7-wS3FEwvhNmt7SmnGmT0Z-xtd7bxfyLV67Pxz6xGsBsOBKX551jzR9iQL3TOmR_NkR4jHmV4hpncfF5VLYUPGTFF17lqhlS_Hp4zRH4ekN_cZAeZbo1-PfFJp7eQshvyC-pp84G418y61Hvl-DplVaVvS75H-WR077iWsq3WH_f590Xo24aFB3Nmr6WM0MIyNQZhnxKCsGlGVR9n3K-kTlMXd2u384ca8P1H4AcYYXj7hyQBzO6vw7NaRzLT_T_wCyxqDDaHtMh_-lYJZWJMWX495X0d7TJ9q4xHfMw-cW_aujD3pQ8BwCpT0iOVHuvBza_CpI19BP21bI_XPFKBnTqenxEA14CKvqdW0wW349-43J2KdhDpKH2atbkyQPSeYdNs4FoT9R7s5j9icwFHea9k39zaOPRdoD8ZB61WKShxAjr1pcSJMLOTkBdSSQDoMH0isPk6zI0pT6dLplP9mbP5ieZvS8VqP4co_TUyT12aY4xNQ_ZLSQX_R5OtQGxSV9RwlKPT5PAa8YC3FVllkNMI5W_X2501-xbZDcV5mHY1evDc7tXalx9HAoPTXygRrQxJQ9-fPoq40Up58ZP23b5qROmX8EbWT0deRRhV0CItkTlSe_Do0LP2xUSVSU7hLZi9z9zZSVtNzaXrcT3T2UIJ5h1DQVwo-rmvsB363d-9A8movtFnEy3NQnbXi4zidaszoyHBzxY-_a9WnEGfgwYbXCu10UuQ8VUgyvlB3es-gNNg0rLRHTat89EIeaxuwJ9_De9_df63kHko5zOyWAeYO2FUH23s2eKljs75z8LKrT9iiHN0WyJDkyxan7IK7nS8eXqKbNs0fnZdONcPnFIT72_CQculie1-D_2UUM6dMWST0NL_lCEg1SOspwepY4azv0KmPu2fSC-WCiGXDukfzC0NngPsJBtw8uIIzankMNS50qguS9vPwsKnWelJ9Fdc-U9ki5FJoPftAiZlzA3t56O4-9s_wQNg1ZHpt-OZYUkORnvez26L1XOJyoGM5Z4QeyOUI5a-nx-EsGiT0jWc_fvkLZ47dhZfbqEsu5tP3hNYlB5kH3asOwKsosSuzPED56bSfaW3t4Pa8k5TvvK9opnszhxbySJiFYrcy0ldJI6tWRcm9ehSb-KsWwkssyCpz8j7eZEX5Y_bj7-HcXth3U_RMGwP2OcNfZwTemN4DumPEuQkEUJwZmpyiYPAEtgKIUsKOyv19sX_H3PxqhZk-ayYOfhlyR65iUcYmu6HWUw7QowhzmV5vrkoRxBNO8KrM4qbKoJlVECkqKNAqrIo-u2DUMYRKWYRlFUZHk0xpGKaRximBW1CEKgySkW8SaqdkrUyHXV_YS_XUU5kUCrxpU0UbtfxEkr-2F-6pbqyAJG6a0epmnmW7o9dzSZC-BUwUEB4xjISXFPTOWqFF_WnDVyeb6j_90oFf86Rr-JwAA__9oTDx5">