<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/130349>130349</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Clang][Modules] Crash on using-declaration of imported closure base class ctor
        </td>
    </tr>

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

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

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

<pre>
    m.cppm
```c++
export module m;
export constexpr auto f{[] {}};
```

main.cpp
```c++
import m;

using Base = decltype(f);

struct A: Base {
    using Base::Base;
};

int main() {}
```

See https://compiler-explorer.com/z/E84Tqorf4.

Assertion:
```console
clang++: /root/llvm-project/clang/include/clang/AST/DeclCXX.h:871:
void clang::CXXRecordDecl::setImplicitCopyConstructorIsDeleted():
Assertion `(data().DefaultedCopyConstructorIsDeleted || needsOverloadResolutionForCopyConstructor()) && "Copy constructor should not be deleted"' failed.
```

<details>

<summary>Stack dump</summary>

```console
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 -MD -MT CMakeFiles/main.dir/main.cpp.o -MF CMakeFiles/main.dir/main.cpp.o.d @CMakeFiles/main.dir/main.cpp.o.modmap -o CMakeFiles/main.dir/main.cpp.o -c /app/main.cpp
1.      /app/main.cpp:7:2: current parser token ';'
2.      /app/main.cpp:5:1: parsing struct/union/class body 'A'
 #0 0x0000000003e66ab8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3e66ab8)
 #1 0x0000000003e64774 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3e64774)
 #2 0x0000000003db1088 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000077236dc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000077236dc969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000077236dc42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000077236dc287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x000077236dc2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x000077236dc39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006896665 clang::Sema::DeclareImplicitCopyConstructor(clang::CXXRecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6896665)
#10 0x00000000068976bb clang::Sema::AddImplicitlyDeclaredMembersToClass(clang::CXXRecordDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68976bb)
#11 0x000000000679e048 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+++0x679e048)
#12 0x00000000068a0019 clang::Sema::ActOnFinishCXXMemberSpecification(clang::Scope*, clang::SourceLocation, clang::Decl*, clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributesView const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68a0019)
#13 0x000000000648e20b clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648e20b)
#14 0x0000000006490883 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+++0x6490883)
#15 0x0000000006464ac8 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+++0x6464ac8)
#16 0x0000000006421e34 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6421e34)
#17 0x0000000006422899 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6422899)
#18 0x000000000642a073 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x642a073)
#19 0x000000000642af4d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x642af4d)
#20 0x000000000641d3da clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x641d3da)
#21 0x0000000004829f58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4829f58)
#22 0x0000000004af1e65 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4af1e65)
#23 0x0000000004a7563e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4a7563e)
#24 0x0000000004be0fae clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4be0fae)
#25 0x0000000000d51047 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd51047)
#26 0x0000000000d47e0a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x0000000004871f19 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 0x0000000003db1534 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3db1534)
#29 0x000000000487250f 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 0x000000000483512d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x483512d)
#31 0x00000000048361ae 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+++0x48361ae)
#32 0x000000000483e145 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x483e145)
#33 0x0000000000d4d2e3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd4d2e3)
#34 0x0000000000c14ea4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc14ea4)
#35 0x000077236dc29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x000077236dc29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000d478b5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd478b5)
```

</details>
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWl1zo7jS_jXKjcouEJiPi1wwON539p3UTE1SW7lzCWhsTgRiJZFNzq8_JQkbgz82ORXPqVNny1tDUKv19NOt7kZApaw2DcAtWnxBi-UN7dSWi9t7uoFG0UcBsOWdhJuMF2-39Txv2xo5CQoc-8sR-aJ_TgKvLRcK17zoGOAaeQc3c95IBa-twLRTHJco_GKXw_oqXOqfkd_r1ddOUtOq0UueXrGq7Yr9VCfpZNVs8BcqASNviQvImXprAZGoRCTei0klulzhBHlJLxzqEYwxHjQgT4_bKzNvD9FJqkZhDQ2RCJF4Z8MR-gcAvFWqlVoXWSGyynndVgzEDF5bxgWIec5rRFb_RGR1F_mPf3JR-nM7O5EShKp4o2cf2s8byRkgJ8kZbTY9G16CEVkJzhUiK8Ze6lkr-D8g13_2cquqyVlXwMGd5OERkdUScpY-Pc23yEui0LXrvfCqwFbOMJE-Pf2EnItCS9tbEtTXumVVXqmUt2-pdrJmlouvcgkMFBSWIatxbxDWhpCooIra8fkSStoxBcU5PRiFKQpT3AAU8vsLCMZp8RMkZ53WuOJiMrNfWHuHBIgEGBGiRWwoWhkst7xjBW64whngYgeZIBLiklYMivmxV5GXFqBoxSTy7va3ZFfXVLwh7-5B0fwZF13dIi9FZDWM9MLHjnTmyIl_CL4RtMZUbLoaGiV7n_JWnYqcnRdndEernCnRNc-IrDIdmquD8MCz2SbPZ4pzlm914HrLi5q1sGxoK7dc4VmZc8bFrKjopuFSVbnEs7Lhs1xQuR3flqpA3rLfosTBs_slnt0_4vSePsOqYiARWZldXVRid5m37Zzj2f3qHWLzAiPfeYdczYuatnjG37V2rpmmbXtwGzmJq_1yPOAlIfISov2Td0JAo3BLhQSBFX-GBiMS6lRBQuQk5JyKBfISvdXMVJ10bFQisuoavemN_6TEOu9qjYnVhxHxHOy8Orv_PAgCmkVY7_l-W75Je_FDVI0y4fgoaK7T4CAk6F9rLpUAWpsNkuKqUXa7RJ8UdIh8cV57eHovWvDuBLwfhv4p8CkD2nTt9-ah2jSUIRJ1jalUBWZcL3ENqBrMAJWMoBaZ60QRTnXQ60z4AuLNYvs_2hRMrxj1HI5kUt4oeFW92x3zv9Xv9frDkHhBkftkQZzeKFZliKxeo2Ad-DNWNd3rbNN0diCfSz4PDGQzZQDsjxXGQVzmuFVbAbRYP1eMfUy7mT9oX0zh-mGAN9JQ8FHYfhgMioOxYhKFpYdppmv7h9SaiYPa8Eitm31YoZsNCqOxQi-GOPiYQjNlUBgfBlgQxUEQLA5r7gPU1F7poksFnCm3iERnKzVJrrBVeqzWEr2pnYklYZBlpy1JimJnBXvrzSruoc5AyEee6pz3nzBHAx7MGSWpIIzB8aMz5uTqe7OqgBUT2A85151nolPr4W3eiRy-8Zya1m48uLcwPciIiRD07SeUyEtPiHp3H1ng4uAPXcOKRClRZZ0C-UcFf9l2yVSIz2fd8jqwTsZBRB3HjS-y3lRymz492eh5aCGvympn2if64r-TXcvfwK43YtePgDjZEUBxcP0uZj-Nj74L2Rd5U0pPe-TzubJsDFz5Y65iJ4q8y1zpvNXzBJN8rPizvXjU3eH_V03x0TjUint-LoEoHqFuGVXwtSn5sXyS5zACmeKMc3ZB627tvoV5jwev4BvD_uCbxdg3gU_z6CIttsgYbvfGT5L1VUn-98ntJb9RBQPZ3yqdMqaJaVdTH99aaGgNe61XcIihfHBIMHYIccHz_9Yh38Wqa3K93hLKr40CYZv8v88QH5aoms15_x756wp8GUYGvsIJXySK4_cG8Ii2qqmOM_JVWJtG2y9hTfMysBZNWKNOeDkl373aoDpg79cwdQ0utLUDF_GUi9IvLnLxyNtv8ALMltBDEr639M8Ofihx3F7-JnjXmsbz7tjwoRe7Nwe-X81Z7IOiCq5VB4yZexLI-JHDdwuvoEckmAPOaIrbWrMrfvbfKwA2kAbAo4cKPyJxuRgVrpQX8Bs0Sb479PWSu1fIOwX9rf60-XNh9kAGmKMu3KelC-OH0pXQpaUpTuC8EkKLYUDojRGGi8CDMZF2za-NVLTJ4TSX5026Svz2OAcrRj2mn4FT0pEVPd7BmBd-qgM_MvYqKajHN6AfdWFOsXAdP8R57q779yKnn1-3VOyeefaPrqN7JMUvvCquY4RFOdgQjG3wQ3Ao3tGeuo8mLxxY8lBTxv4A82KibtlJg4Lxw7vW0bdio4e9QlQvICZnghpTOE4SoVu6saHkQGnZtwBrYVg1o7sXLXdWJKeMZTR_XpfNOLHbhfvQSd2U1zVtiukuPuk9c7av7_FWr041AQfkKFE1m75cWNfuJ6zX-eur69o_MiqrfC2NeE_hSFjfWCtBKyV3wxN1lDG9Fbg4GNciyZDNTfhYws0UREJG60yn43CgikS7o-TfeXbCGdH0AHjhHZ5VnzrmtSM_u-aBlsDeRlxe9tsVDrQt4iHg40lwkYVT4v_l4NCMz1sq1Nw5GwXj1y1-5C1cUpxlzXiNHlXGHZWj1D2ZqAUOkkR6YY1D0WTUzhwY9rldgjF7H0repJnxAndcvd5Dyu88k-cZ-Z1n-lF3xMilXLyPgJZW2vnHB0gXSezD5JdQqckaqCQTKsH1F-dgLw-uRw3Cic7gnAt-IZVX6FYNPQN53qSGFwT6x8JdJ7IDb1JJcnS8fq5Cf3bvYZANuEfdn5O7PlDffFPy2Qtb1cPCk7d4JC7iD750NFMGhdO3dzH4Dl6v9Zy1VFSo9YFZ714C_IMlwmmjFmULbJV_vp-08n7pow8_EFkN337cFLdeEXsxvYFbN_RdLyJxGN5sb0kW-uCT2A1y4oJLnAVxXNdZUI8s3DgKb6pb4pCF4zkhcUnshfM4p7FPie_lpUsdp0S-AzWt2FzH6ZyLzU0lZQe3rud4fnzDaAZMmi-2COktIGixvBG35tOfrNtI5DuskkoOKlSlmPnMKzUzFku0-GIf3iVaLO1La8wb-w3UrBiOTTAvsf3WCnTh47ITgDMqTcKXEuvMcdMJdjv-2GlTqW2X9V84mQ139GWSsUoisuoNe7kl_woAAP__eFDPow">