<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112139>112139</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang++] Assertion `(data().DefaultedCopyAssignmentIsDeleted || needsOverloadResolutionForCopyAssignment()) && "copy assignment should not be deleted"' failed.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          yijan4845
      </td>
    </tr>
</table>

<pre>
    **This testcase is generated by a fuzzer.**

Compiler Explorer: [https://godbolt.org/z/8n673vjre](https://godbolt.org/z/8n673vjre)

This invalid code will crash on Clang Assertion Trunk. It seems that this goes back to clang-11:
```cpp
struct C {
  virtual ~C() = default;
  C &operator=(const C& v = {}) = default;
};
struct D : C {};
```

Stack dump:
```
clang++: /root/llvm-project/clang/include/clang/AST/DeclCXX.h:922: void clang::CXXRecordDecl::setImplicitCopyAssignmentIsDeleted(): Assertion `(data().DefaultedCopyAssignmentIsDeleted || needsOverloadResolutionForCopyAssignment()) && "copy assignment should not be deleted"' 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>:5:16: current parser token ';'
2.      <source>:5:1: parsing struct/union/class body 'D'
 #0 0x0000000003baa6d8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3baa6d8)
 #1 0x0000000003ba839c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ba839c)
 #2 0x0000000003af55f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007060f5642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007060f56969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007060f5642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007060f56287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007060f562871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007060f5639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006b26a8d clang::Sema::DeclareImplicitCopyAssignment(clang::CXXRecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b26a8d)
#10 0x0000000006b26f6b clang::Sema::AddImplicitlyDeclaredMembersToClass(clang::CXXRecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b26f6b)
#11 0x00000000069cc814 clang::Sema::ActOnFields(clang::Scope*, clang::SourceLocation, clang::Decl*, llvm::ArrayRef<clang::Decl*>, clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributesView const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69cc814)
#12 0x0000000006b30d29 clang::Sema::ActOnFinishCXXMemberSpecification(clang::Scope*, clang::SourceLocation, clang::Decl*, clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributesView const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6b30d29)
#13 0x00000000066b0a8d clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b0a8d)
#14 0x00000000066b3133 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+++0x66b3133)
#15 0x0000000006687930 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+++0x6687930)
#16 0x0000000006644e24 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6644e24)
#17 0x000000000664588e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664588e)
#18 0x000000000664d023 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664d023)
#19 0x000000000664df0d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664df0d)
#20 0x000000000664042a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x664042a)
#21 0x0000000004502bd8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4502bd8)
#22 0x00000000047bc4d9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47bc4d9)
#23 0x000000000473b07e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x473b07e)
#24 0x00000000048a204e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48a204e)
#25 0x0000000000cdb81f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdb81f)
#26 0x0000000000cd352a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x00000000045468a9 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
#28 0x0000000003af5aa4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3af5aa4)
#29 0x0000000004546e9f 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
#30 0x000000000450c7dd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x450c7dd)
#31 0x000000000450d8cd 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+++0x450d8cd)
#32 0x00000000045151f5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45151f5)
#33 0x0000000000cd86ef clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd86ef)
#34 0x0000000000ba7c44 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba7c44)
#35 0x00007060f5629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x00007060f5629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000cd2fde _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd2fde)
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/eJzkWl1v27jS_jXKDWFDomRJvsiFK8f7dt8uWjTBoncGRY5sbmRSh6RcZy_Obz8gJTum_LHNIu7B4hRpq1DD4TPPDGdGEonWfCUA7oPJh2AyvyOtWUt1_8L_ICLJk8ldKdnLfYBnAZ49rblGBrShRAPiGq1AgCIGGCpfEEFV--efoMadcBDOg7D_t5Cbhteg0MOuqaUCFcQzFEw-rI1pdBDPArwI8GIlWSlrM5ZqFeDFnwFe5CLN4u0fCoLJPMD5j4vj6fHyDjcXW1JzhqhkgL7zukZUEb1GUqCiJmKFZlqDMlwK9KRa8TxGHw3SABuNzJoYZKySlQSNSkKfkZGI2mmjKLKIutXSsPuhTdONaKNaalCBguxDN4LQlivTkhr9uwhwHuApCuI5YlCRtjZBfBArUIBT2Vh-pQpiaz-VQhtUBDhFWzfLas3ml3TYW_vrHsgcWeaL_cSD5B74MWuPxtrJ2k1zamD3qyMgwB_sj3UoXigpTYAXdb3djBol_wBqf-3lFlzQumVwNDJ7fArwYg60Lr59G6-DeDbF2OraSusqJxXPgnhWfPv2FahUzMp2QxrMx01Tc8pNIZuXmQvkDQjzUc-hBgOs49eqe_WtBY9zRgzp7o7nHWvALihBQVYEWYEEANOft6BqSdhX0LJurcKFVP7EflHrE5xaVwUYU9m8IHIQQXot25ohIQ0qAbE9WhzgDFWE18DGHcNfPj3MHh-QbssNN4igsl0hBY1UxgbgYD9ws27LMZWb3gOnjuBat6ADvEBEMNS7A5k19HvBRrZRhEKAC9QoaJSkoDUwpGWrumE7k2gtKXcbX7UCaap4Y8YXwyYcB-H0i5IrRTaIqFVrSdB9yMjGhUifIUawzxB9kIzI3nV6ZOy-DPCi5OI1hmz0odGKfSeqGiVotEIjafWSprHaW9O0ZqzRaGO5QKPRLk9HRG9G-kUYsgviORcGajSqhBxtQZVSg72PRo9oNFpROjJS1nRNuHCb8ApeK6wFafRaGjSqqKylGjFOVkJqw6nu1nBMe8NBXPT0xg8dYZElzBuOZ5MgnkWpJY22StkoaojSoJCRzyBQgDO7nXHWacCXNFgFdiIXK9QlhQAvWsFlT6nWyGZ8q29-0IYCHIco3IX7P3FJSMpy5MKs240vurv4orgwLgieukjKX4UU-b6U2iggG7c5CsTthrFbJX-nUAjwh3DXwzuUAYs_GuDP4yk9h7-ogYi2-Swe-UqQOsB5K1yJZKiWdpVboLVgPLTYQ0uqyaTKUWFDx6bBLaiXDt7_EcFqu2jeM-nJFFIY2JmxrUfxLHR_D0vE_RJZmIbVJE3wBIe9aTUvA7zY5ekyTUY1F-1utBJtd4OOtRynDrib4sFOfJ3TdFpR1Ji1AsKWz7bovmkBN99bYDIEnWQpWmnHxVvBJ1nq6U593TjPqhiR0ibbN2l2Ez3N2YnmqHyzzqj0dOa-zngK0_RtOt0UT-f0OOrSEqck96rwI2xId2XLMFFwvgDbVuVS6ba94bvvoB7qa9uH4ygc2lKl5XlbZozt7ahfesPYb7ApQeknWdic-F-xqEpLzyIvg6VTSvMouWARNZ_FgkPNBsgfqWzAIS68ma5KfJKUGFcIvJsHI4ujdDlTirx8hSqIizOi8cNbFrh684stcmxmjOJla0D_zuE7co2wqyDvT3zHq0c89kMpDhmeXiVecL0uvn3rYuixAcorvrfuHd3xzyS4488jOPYITstwkHccRnV0_UPkvhslfa9y6ANcqT3vlPenq2PDoysZ0BVHcXydLpvDeqpcs3AkbORzd_Fk-8j_54K9NRqt4p6iayDYE2yamhj4KCp5Kj-j9lHjCGSBSinrK1r3a_ddzo848Rbusex77pn47smzaRxeZaarOY7eg_2DxH1Tnv8-v73kJ2Lgle9P3OaOYYbal9inlwYE2cBB6w184ij3fJL6PkkSwMlf-uSzWrSC2iXnUH0UBlT3QPDXqeLNElysLrv4xGU3oMwx4lGWDSib5Dn8aBh7zHHBT7PzTYgbxtxPIc7y4hGXD4hjIb6enh92XWgdEfhzyLoFHdZaj47pkI4qvF7cn2TzCbZQd0X1mIfPDflXC1-MOm07f1GybVxD-nBq-2uD9ptkbW0fW6Qyj4YYuFVZcGYe84DDAQ9hgskJD-6FaD6E3hm0L4fd_7fAbCF5mL1HjmQS4pLl3mtZyeAXEDO31buhhx3Q1kA_1L_hfl-kPRAPqdejJ1lJE-b16Atl641gZ6DeCGSHwQMZ-yDjMszAp7Nb9qPQhggK5xm9bNVNYrnH6RnidaBJTnCYeIb0kF_t2cpzLfqJvTdJSj0-zwCvRwspK_OoQpRGyw2xOvLzT7provaPRoeHXG8MF-7LxW3s6FB6ZqQDM-IJJmhPfhE9uUxxZMzjhtT170CNVLYfO2tT6j_pWx19r-Y9FjLFt6BOXy1aWJmfNpI0J9Puk86r3qpvEJbKcevu7j_YPHQilNR1SejzshJ-wu_W7mOoiAq52RDBhpv6rA-16eVkY1cnloMjfoziYtWXkc7BhwnLJd3tuq998awkmtOlduI9i56wHVgaRbjR-9sDdaSu7Z6Q6ui-FZm9pngXRB3nbkqAs5psSkYCnL1ShfP9e-lfZXneH_nwbTIhyZErzr0z7u58bcUjqaB-8ei87robvCDvEHuRPx2GGEwr9L8cIpb0cUOUGYfXYsH_jpNMQpoxdpE45ztyUjH3bHrJfDDRChwljOLKGseiM6_ZObLtnRsIa_ZxQMXDVofl9M28_CpLfZmUX2VpH409Uq6l5kMcNITbEDh97XSVxz5YfgqbliyPTb8dm0STqJpcQj4_uvYahzMdwyUv_EQ2b9DOOno8_uJBYc9T6NPbvkPZ43dpZXbygv5S2X73nsQi86B7vWFYkowmCbKg33vtTrW39uDzIJ6y6Ru_abopns7hZ8EpJCFaLu20pTZEmeWRcT-8CiT-KtnA4bhigDr97-8zq_yw-vHteIZAKenOZ7lxVPVPGIj2O6I7n4K-c7NGsOOmO1AVxYmF2WpAoy0yEmkAxI_a_ungJJgC0yoBdk_ayYPzRXfsPmbTeEru4D7KcJ7jPEzju_V9WjGWlnlMEoZJnpFJMo0hTnCW44wAK-_4PQ5xEoVRHCVhFOIxTXOWh9EEWESTmIRBEsKG8Hps98pYqtWdOxVzH0U4iqd3NSmh1u40HMY9NTiYzO_UvTtMU7YrHSRhzbXRryoMN7U7QndM5mT-Dzx3dNeq-v7vHyzqWdze4_8EAAD__21LYSA">