<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/113088>113088</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang++] Assertion `isa<IncompleteArrayType>(AT) && "Expected incomplete array"' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend,
            crash-on-invalid,
            clang:frontend:fuzzer
      </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/a5Y7138jx](https://godbolt.org/z/a5Y7138jx)

This invalid code will crash on Clang Trunk and Clang Assertion Trunk:
```cpp
int F();
int b(int(&&)[F()]); 

void f() {
 b({1});
}
```

It seems that this goes back to clang-6.

Stack dump:
```
clang++: /root/llvm-project/clang/lib/Sema/SemaOverload.cpp:5520: clang::ImplicitConversionSequence TryListConversion(clang::Sema&, clang::InitListExpr*, clang::QualType, bool, bool, bool): Assertion `isa<IncompleteArrayType>(AT) && "Expected incomplete array"' 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 -O3 <source>
1.      <source>:5:8: current parser token ')'
2.      <source>:4:10: parsing function body 'f'
3.      <source>:4:10: in compound statement ('{}')
 #0 0x0000000003bba5a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bba5a8)
 #1 0x0000000003bb826c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bb826c)
 #2 0x0000000003b05858 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000078fd28842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000078fd288969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000078fd28842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000078fd288287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000078fd2882871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000078fd28839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000000000710295f TryListConversion(clang::Sema&, clang::InitListExpr*, clang::QualType, bool, bool, bool) SemaOverload.cpp:0:0
#10 0x0000000007101bfb TryListConversion(clang::Sema&, clang::InitListExpr*, clang::QualType, bool, bool, bool) SemaOverload.cpp:0:0
#11 0x00000000071029c6 TryCopyInitialization(clang::Sema&, clang::Expr*, clang::QualType, bool, bool, bool, bool) SemaOverload.cpp:0:0
#12 0x00000000071054f0 clang::Sema::AddOverloadCandidate(clang::FunctionDecl*, clang::DeclAccessPair, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool, bool, bool, clang::CallExpr::ADLCallKind, llvm::MutableArrayRef<clang::ImplicitConversionSequence>, clang::OverloadCandidateParamOrder, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x71054f0)
#13 0x000000000710f4e8 AddOverloadedCallCandidate(clang::Sema&, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool) SemaOverload.cpp:0:0
#14 0x000000000710f809 clang::Sema::AddOverloadedCallCandidates(clang::UnresolvedLookupExpr*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x710f809)
#15 0x000000000710fb0e 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+++0x710fb0e)
#16 0x000000000711c205 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+++0x711c205)
#17 0x0000000006c8d5b8 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+++0x6c8d5b8)
#18 0x0000000006c8fb1c 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+++0x6c8fb1c)
#19 0x00000000066fb2fd clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66fb2fd)
#20 0x00000000066f3cc1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f3cc1)
#21 0x00000000066f5e17 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f5e17)
#22 0x00000000066f5ea9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f5ea9)
#23 0x00000000066fa8c9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66fa8c9)
#24 0x000000000677d6d9 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x677d6d9)
#25 0x0000000006773a4c 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+++0x6773a4c)
#26 0x0000000006774960 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6774960)
#27 0x0000000006775835 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6775835)
#28 0x0000000006776f8a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6776f8a)
#29 0x000000000668ab13 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x668ab13)
#30 0x00000000066bf1cd 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+++0x66bf1cd)
#31 0x000000000667e85e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x667e85e)
#32 0x000000000667f01e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x667f01e)
#33 0x00000000066867b3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66867b3)
#34 0x000000000668769d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x668769d)
#35 0x0000000006679bba clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6679bba)
#36 0x0000000004530518 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4530518)
#37 0x00000000047eb7d9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47eb7d9)
#38 0x000000000476a2ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x476a2ce)
#39 0x00000000048d0eae clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48d0eae)
#40 0x0000000000cde2ef cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcde2ef)
#41 0x0000000000cd5ffa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#42 0x0000000004574239 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 0x0000000003b05d04 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b05d04)
#44 0x000000000457482f 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 0x000000000453a12d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x453a12d)
#46 0x000000000453b21d 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+++0x453b21d)
#47 0x0000000004542b45 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4542b45)
#48 0x0000000000cdb1bf clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdb1bf)
#49 0x0000000000baa2b4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbaa2b4)
#50 0x000078fd28829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#51 0x000078fd28829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#52 0x0000000000cd5aae _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd5aae)
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/eJzkW19z46iW_zTKC2WXhP4_5MFx4tnMZirZdnar9smFEHKYlkEDyO30p98CZEfIfzqZjfr2vXfK07EFnPM7v3M4HCGBpKRrRsi1F9948e0VatULF9ev9E_EoiyKrwpevl57cObB2fMLlUARqTCSBFAJ1oQRgRQpQfEKEKja79-JmNrOnn_r-d2_c75paE0EuNs1NRdEeOEMePHNi1KN9MKZBxceXKx5WfBaTblYe3Dx3YMLFP9vGoTZnzsvvvVg9v7uMO-rN7gp26KalgDzkoBvtK4BFki-AM7AvEZsDZ5Fy74CxMru90xKIhTlzLZovVZm4tsPbhp7hTIFFh7MtNrw5u1a4cGMMmVaEvPJvfhm31ObpPuDPtQtpyWobA_gpZ0wI8lLbwIvve0r0T9dTH1Z9wpIQjYSqBekgNIkrDmRoED4K1AcYG3mJJn2xyyVbizbTXNsr_1pRnnwRn-0F-FCcK48uKjr7WbSCP4nwfpn129R08KDiyXZoO7P45aImqNyqvkLZ3EMfS3I9g9nXji73zQ1xVTNOdsSISlnS_JXSxgm4Fm8PlDZa_Fg1htp1SQenDvyGFV61N2uESY4ndb_alH9_NoQfbngvD7-m2t8b-HgJT6VyAvn9wzzTVMTRWZCoFcjJLzzYDZ7Nu4zTgcehHe7hmA9TehhBEB6iAehB1NQIVqTsnPE08PdbHkHZFtsqAIIFO0aCNJwobTTBnOAqpe2mGK-6Rxw7AcqZUukBxcmtCnDdVsSoF5IF_86GpRA2NjfCNIIjomUpASSt8Je1iORlBxTM9lFy4DEgjZqejZq_Knn50-CrwXaACTW7YYwJbuI4Y2JkC4rTMg-K3RRM0F7ruVEmbkHFwVlb0Glgw9M1uU3JKpJBCZrMOFaLmoaLb1VTaumEkw2mgswmeyyZILkZiJfmUI7L7ylTJEaTCrGJ1siCi6JbgeTJZhM1hhPFOc1fkGUeeHtRby6s2SokS9cgUmFec3FpKRozbhUFEurwzDtXn4MgRfOO4rDO0taoElzLoez2AtnmZkgrRCEKdAgIYkAin8lDHgw1fEJUysAnhAQeeEsMFNMj6RsDaqWYRPJOrdrEdVBQHhRAGVAk8BbVgKpkCLaqcBkq1QnK52d0kPyBR4MfeDv_P1_YVGgGGXABKqZe_JV2i9PgjJlwujZxmL21kmgbysulSBo081tk1Rzq_hTgsmDN_6ug-fgDwb4M5jgU_jnNUGsbR7Zkq4Zqj2YtcwsrCWoudYyBloNxkELXbR-nMUZmOvg-0Iw3xLxauH9B2JlrZVmHZNOnzlniuxUl5998_9BRdipSLOqhFkWwRj6nWk20--yZJVEk5qydjdZs9Y24Knk08QAN0Mc2JErM0_yCoNGvQiCytVXvVR_SIEZ7yiIh6CjNAFrabj4KPgoTRzZiSsbZmkVAlTodP0hyWagIzk9khwUH5YZFI7MzJUZ5iRPPibTDHFk5v2oSwMf5nH1D1qowYkCoxfAekL7A7RBURW_LtrgiFucaLRz3rxq_RTV9DtS70T8d5F-BDEcII6jygdDZObbrCz3ouaIlbREirhWLLqF6pbg-hi3vjrDulh5QlToxrfEbAqyL6TywvkJ-3WR5og6wrEkqqPvMiOOlDmqa6PCQrh90Bf-k7LSxfZHq1BRk9MQz9e-70D9hATaPIqSiL7PPnnh6Xz6do8FwyAcOL2KSAZ6_iWlpuKMl0_H6rF3e43PZNPUSNfdtrDU0_CeVbwLkvHj4D0zIRqSkvn5D2fCgCnpUvXfTBDJ6y0pHzj_2ja9CT2ezWNEkObCiaB4SFbhk9NkFS2tB3QZxE5IYa7z2TBjnM5_7yL14qQ9y-3SlNEPHHcp-h3ED9HNTAb8QmRbq9Na4Rwo0dr8MBvJXYVPHHclrrsCDP34tLtujt1lgY_hr4vUj-rMHohhpvh0dxi2HXekfXckOCvjIrvgjk9wwr8svR17Dr3ZgN6qCPCZTI7VI_snpncMOjVbDp3ODUOSVAWsyj6aJ7PD0fv-xKWq6E6jJNLURG1V0Z3L78cS5ecbau3oGwr9gaEhxsFFQ-fI3k5YK137-p11P_N7X126k2JYS_WH6kpfD18qU4gNh44SA9Zyh5pgQE1MgnRcan4pPrS5Dh_wiA-UX-RjZh7c6OL3PawMrBzHJOSUdDAcmIQyfNmkX8QQjdMxxCnkkzQtk_LHhiz3-6PnbTHfy6XaqG7LbQx7LFzHnnhgT4gifNGegy2PQt-WIWHWkFmliJgpJWjR2juVtzVquUF1_T8EKy7cXKyt7XJxCFuTii9lqxMUXVzVhuuoHd8HeVLbsMcYbtAsO25IBm6I8sT_G274VXgfgzNNicNZOuAszsL48rLRPa84cHfDy1cPZmNVjxaSgzkbYE6qDF3EvN_2GmIe7I6ciXYnYmzNOVJEa0McSweFXYaKIHyXpbekooweb2M-2SdW-2jn4j1Ru98cumcVB5gzqS6PerA7Z10WeKBSjbXsG0L6jIWDCrGoAny5FNZU_CZ425wlatkQfHo7zVJ4ekK_M1GeJfq4_7tScydvwcUXxNbkntHRyDfcOuQPatCUZDH5IfmPohe090wRYZ_3_f8XnaMeFx1q90Z1G62oZmQEygwjDmWDMjWt_ODHlHULlcPc2en-6cQdb6j9BOI0Lw5xg2I4S9Licmq829nQclf6n0DWGHlPW-vQEQ3oSJP8ct575s0D2ZLaLnx9Hh4b9FdLntSg4DkkSrNFcqLcedu0-YOXbU3uNw0X-_uKUVZMa6bDQzyYT3lRHNcGs-Xz2ScmY--GWUgOZqdujeLQjwNns3HOS_IbYXY_Zr8DQ3CrSHepe7vtc5F2QBykTrUYpaRI3Ru3hdBrIStPQB0JpMXggMxckAmCmLh0WrX3TCpkngOeYvS8VaPEcofTMcSp_qKs9Aki7iajgfxmz_ZQG2SX7B0lKXX4-gZETjHm45JAUgGMg9UGUfc2q7_3-oLEvso8bLs61-AcbDktx7HDonTMCAZmxFWFwJ78efBsMsXpe8b7TVOftClxt6C1jK6O7FXYOSgF3RJx8nFoBN20kUYwzA0xPbn7N9NWwnBrWvcv1t7ZLhjVdYHw11XF3IRvdXcxNA_mfLNBrBxO6pM-lKrrxxutHWkOevwoQdm6W0asgw8DViu82wWB_VEgSfFKmu4di05nfWGlBKJK7psH4lBd6zlhb9679u6xnrMhaTk3QzyY1mhTlMi8erenCmb7185-58Vpf4TDl8VKP-q54tQrYbblS8uWqCL1q0PnZdeN8f6bQexEfjQMsQxW4N85RDTp0wYJNfUvxkI8WNJRAMuzxBnfoaMVc8-mk8wHA3WHc7fkF7rOBu8jHGz75AJCm-0E1LDUKWDwYV5-54U8T8rvvHigUjmkXErNhzhoENUhYF7gfD-PXbD8FDY1WQ6bbjkWR7CI4nPIb3vfncLhRMVwzgs_kc0RyllDj8NfNljYi6Do0tu-QtnjN2lldvQSy7ll-9NrEo3Mge7Uhn6BECwioEF_tm4ruq879gfv0eZl_sFXls0QR2YwlEkiH6xWethKKiTUqmfcu7WQyNUCh5UcQgRY-Z_vMy38oL3fHM4AEYKLwykdUHV3GAB3M8IeYAHfqHoBZEeVPWUVhJGG2UoCJlugOJCEANor-_PB8TBBVCsY0XNSDx6cP7oqr8MyD3N0Ra6DFOZRmAd5cPVyHaE4JWkGkzjIQj9BZRxlFSqyxCckKaPsil5DH0aBD_0gjpIwmBY4zHNUxqkfpiRJMi_yyQbReqrnypSL9ZU5NnMdBKGfZVc1KkgtzRE5CPfJYU-COcMz1w3mlAdnk-6o2VvDcISulr5_126CXnx7Ja7NmZ2iXUsv8msqlXwDoqiqzem8vkvi259xHumqFfX13z9w1JG3vYb_FwAA__8QDkJu">