<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/75221>75221</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            crash on invalid after "error: 'foo' cannot be defined in a type alias template"
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend,
            crash-on-invalid
      </td>
    </tr>

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

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

<pre>
    The following invalid code crashes on the current post 17 trunk(2e197602305be18b963928e6ae024a004a95af6d)
https://godbolt.org/z/e7GqqKEKf

```
template <class T> using foo = struct foo {
  T size = 0;
};
foo a;
```

It triggers the following assert
```
clang++: /root/build/tools/clang/include/clang/AST/TypeNodes.inc:74: 
clang::TypeInfo clang::ASTContext::getTypeInfoImpl(const clang::Type*) const: 
Assertion `!T->isDependentType() && "should not see dependent types here"' failed.
```
The full dump is
```
<source>:1:39: error: 'foo' cannot be defined in a type alias template
    1 | template <class T> using foo = struct foo {
      | ^
clang++: /root/build/tools/clang/include/clang/AST/TypeNodes.inc:74: clang::TypeInfo clang::ASTContext::getTypeInfoImpl(const clang::Type*) const: Assertion `!T->isDependentType() && "should not see dependent types here"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++14 -pedantic-errors <source>
1.      <source>:4:6: current parser token ';'
 #0 0x000000000379d408 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x379d408)
 #1 0x000000000379b0ec llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x379b0ec)
 #2 0x00000000036e3bd8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f0798c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f0798c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f0798c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f0798c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f0798c2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f0798c39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006e9af1c clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e9af1c)
#10 0x0000000006e82df7 clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e82df7)
#11 0x0000000006e9b09b clang::ASTContext::getTypeInfoInChars(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e9b09b)
#12 0x0000000006e9b1b3 clang::ASTContext::getTypeInfoInChars(clang::QualType) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e9b1b3)
#13 0x0000000007340f25 (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutField(clang::FieldDecl const*, bool) RecordLayoutBuilder.cpp:0:0
#14 0x00000000073427af (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutFields(clang::RecordDecl const*) RecordLayoutBuilder.cpp:0:0
#15 0x000000000733e076 clang::ASTContext::getASTRecordLayout(clang::RecordDecl const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x733e076)
#16 0x0000000006e9ac51 clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e9ac51)
#17 0x0000000006e82df7 clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e82df7)
#18 0x0000000006e99db7 clang::ASTContext::getTypeAlignInChars(clang::QualType) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e99db7)
#19 0x000000000613ca20 clang::Sema::CheckArgAlignment(clang::SourceLocation, clang::NamedDecl*, llvm::StringRef, clang::QualType, clang::QualType) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x613ca20)
#20 0x000000000616e327 clang::Sema::CheckConstructorCall(clang::FunctionDecl*, clang::QualType, llvm::ArrayRef<clang::Expr const*>, clang::FunctionProtoType const*, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x616e327)
#21 0x000000000635cebc clang::Sema::CompleteConstructorCall(clang::CXXConstructorDecl*, clang::QualType, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, llvm::SmallVectorImpl<clang::Expr*>&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x635cebc)
#22 0x00000000066a6050 PerformConstructorInitialization(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>, clang::InitializationSequence::Step const&, bool&, bool, bool, clang::SourceLocation, clang::SourceLocation) SemaInit.cpp:0:0
#23 0x00000000066b93f2 clang::InitializationSequence::Perform(clang::Sema&, clang::InitializedEntity const&, clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>, clang::QualType*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b93f2)
#24 0x00000000062b5114 clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#25 0x0000000005f872d6 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f872d6)
#26 0x0000000005f96170 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f96170)
#27 0x0000000005f5f42b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f5f42b)
#28 0x0000000005f5fbb1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f5fbb1)
#29 0x0000000005f66e66 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f66e66)
#30 0x0000000005f67d0d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f67d0d)
#31 0x0000000005f5acfa clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5f5acfa)
#32 0x000000000401e378 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x401e378)
#33 0x000000000428a9b9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x428a9b9)
#34 0x0000000004208c9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4208c9e)
#35 0x000000000436974e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x436974e)
#36 0x0000000000c01496 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc01496)
#37 0x0000000000bf8d2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#38 0x000000000405f3a9 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 0x00000000036e4084 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x36e4084)
#40 0x000000000405f99f 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 0x0000000004027c05 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4027c05)
#42 0x000000000402866d 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+++0x402866d)
#43 0x0000000004030585 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4030585)
#44 0x0000000000bfe90c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbfe90c)
#45 0x0000000000af7a71 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xaf7a71)
#46 0x00007f0798c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#47 0x00007f0798c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#48 0x0000000000bf880e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbf880e)
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/eJzkW1tz2zYW_jX0C4YaEqR4efCDIltdt2mTrbw7fdOA4KGEDQUwAOjY_fU7ACmJoCTH3ljudDbjuhIuB9_5zgWHBEyUYmsOcO1NP3jTmyvS6o2Q1982QPSW8KtClE_X9xtAlahr8Y3xNWL8gdSsRFSUgKgkagMKCY70BhBtpQSuUSOURmGKtGz5Fw9nGMI8TQIcBdMCwqzIkyjHGSQEAhyTIIhJPiVVUno494IbL5httG6UF808vPDwYi3KQtR6IuTaw4s_PbyA9KevX3-5_aXqhve_k6D_sV81bJuaaEBeNKc1UQrde9EtapXRohICedENUlq2VHdf0w_dRITukWJ_gh0QeFHf7KU3-89mPDn0uAt3v-800pKt1yCV5ebAIFEKpD45ldaErz38wfxEM-ThhRRCe3hRtKwuPbzQQtTKw4t-4IJxWrclDFpmy3sPL-6fGvhNlKAmjFMvmqWxlTdYJJp50cwMu-OVQIO22fJ-LriGR919X4PeDbvbNrWHMyq40mgkxsMzD-fI9h3WmlldmeDI6IjDe9-Lbpm6gQZ4CVx3MzMz08OJhxPkYaw2oq1LxIVGCgCVu8FIPzWg0AYkeBh7OEUVYTWUk5NcWrdt6xqV7bZBTJ22VTRXopUUvOjWi2ahF82i3MAHKYXsbJBWQpjFKOEGUmEQVYxDiRhHxIJCpGZEoZ3L7fwIoRB56Rz9gCuaf0aEN719Fxd5H-d4T7f4_PF2trxFqi22TCOCinaNJDRCaqQFGmUapjdtMaFi6-FFXT_s_uc3UvwHqKGZKdWC4RcRbjzAkttlP5MMUUHoFy0JBQ_PUSOhkYKCUlCi3tHw3M4kSgnKiIYSyZYjRSVrdA95qQn9Yv3WILNNwcQL8s9SrCXZIiLX7Ra4Vr0HiMYgo2LbsBqkD49NLSTIncl9sqNb-X1KXhSMHzzCOBPy1-U3Iis_Rv4a-cLIJU1jpLe6afVEIX9ruEC-_5glPlFbXz1xTR696IZxDTXyl8j315T6xgXphjDuRTfPwjODFSeN2giN_IqKWki_ZGTNhdKMKuRXXPiWWLdZ6dKLbmgHPYyR30BJuGbUt4GrkBPYlsHQMDiKd-PyiXX73c5FpAKJtPgC3IS-yfE47YPRw1GAgsdg9y9K8zIOMmQdxfq6elLdh8-ScW3NeN_5QnYYJMm3lVBaAtla554jxnXn6tkbGdPDH4LHHt5-UzX4wxH-IgB6Cv-8BsLb5hNfsjUnJq5bbkuFEtXCrHIJtAaMgxY7aBOIijJDc-MNvwMVDyCfOnj_ILyszaJZz6Qzpk9YE9qYcArsf_slon6JtArSPKMxnuKgV61mhYcXj1mySmK_Zrx99Ne87TroRIlJYoHbKQ7s2JWZJ3lFUaM3Eki5-sLq-nUL2PnOAtMx6DhN0FpZLl4LPk4TR3biysZZWkWIFCZdvkqynehITo8kh8WrZYaFIzNzZUY55MnrZNopjsx86HUJ5KQK6Sv3QHf36_e9wR741sHTo9yrYSI9cNXIcFmlL1Tjr1HBInRUCEeWKIK8eKkl-HxDpPqLjGGAOprgsSZhEf2IJv9sSd0VSRdUIiwiR4loqEQaxUGFp2ZdwgV_2opWIU62oBq74eUd0DtNOGu3JhfL8iN5Eq3-YApVkF1_17RgYGrXoYa26QZoPTDYHBVC1EbnE_KO87vBHI8w45RUb4h5ZJZuygj1K9BOXbQRBGnyHTeZLe-H4l-E5yIe08N1PCYZp1I6Df8GqZROQ0eN9O-fSrORJfKyeIkKs5qt-V-WgQxIRwt3aw4jSnAw1GIJW9IXsBugX2ZybRUwz0ou-qV9CPgoKDFQTGYZdP5GtmCDpk86h_p4qSXj69-hGs04kHGm-c3L5V75ITvY3fHDBCKcPsPO3FhNtlQLOSf1KNgWLacGx4CGM_oe2JlJSZ4MOfYtx27s7WMjDz4f3Y5E7Rb6LIUWo_hwBo5NdgFKLWMOpW4FEk0pFPQMpWLb1KDhWVbnf_wx6H8Nt7-2mhQ1nKf4JLnHbj7w5S2p63-DAWJz7VmJyWHjPWzAb819R63DvVszJSQJpgH6DLIScjtg8Y4zzUjN_ux1zMbm6RQYtO5nQHnLNdNPO5c7O9CK_oXx0hn5o9ZxxS_hawucwi7TQOMs1hF_whbfMfizEWT4MShOViM4cg1Q5FGFX4q_t9PfyRyHwJtdwsM7_hwPd4rTBBfTMIxPZ5cZ1Z_4vzg7UNUljyG7-3RisU8aIvUk2FnZdJ62slNzTqssxaVTc362r8QGn40oIq0NZpUGufsu5IyXM60lK1oN6hhcN-jYrkcrlPf9C_Pu9fNpbxjOWgj5O-FrMB5yGfP1xDjmS1zm8iRMg-8y95MUbeNyY_oYX5veZQP0WNUDebsa7QQVDvVjCePQH286702m5cohM3XJnFYxLr5L5id5qFOqO65Bdi8rX8XNy0Y8a6AZpaCU6WMVM4xcgDLLiENZNqasKMKXRq7DnE0r473zIsSN_e59iCsK53kO5y5xSQLJ8ynv9rFzrQGB70PWBeiw2g7pcA81plWSlkH5LB33ovkID1Af70GfGvK1hc9aunvuPvHZ3fj2RH7a73S_irKt4W7bCKmXmmiwgy_Bg1HT4SEcxROhFTniwR6enilqLlwk95AczE6RHAchRGk2xDwXJfwEfGZDfVcAAW019E27U9Y3RdoDcZA61WSMM5IXufMgKM3exssTUC8EssPggIxdkEFGc3Dp7Ja940qTfbE7ZvS8Vhfx5R6no4hT1cVRkqexo0gP-aDPw742yJ7T9yJJqcfnKOAUVwENwjhPEKXhakuMjOz0a4cNOX7X4LThOXoQrLyMHh1KRw2nrAmKKisxQTvy5-G9zRTZs0_lRzqNnnaMjL4uHNTKOSolezjzojnK3LQxrSKSW2IGcqu-QFhJy63t7SKxOzz3ohkldV0Q-mVVcTfhd2v3PjQP52K7JbwcB_VJG9qjfdMmGrM6MRycegNnMFgD7yesVvTxMQy7LwVRjK6UHd6z6Aw2DSstCdNq1z0SR-raxISQg34zZHAQ4dxqMT84rcm2KImH0wNVONudmf8sitP2yEcn3XGQxQNTnDrP7t_wt3xJKqifHDqfN90FDu87xEPPj4Oxi-V5hf6fXWT0VH7OF-LQJQ6nNJieJc7ajhztmDs2nWQ-mmgGnHu4fmbozCl2LvTyv1fbcahRqYOzJClfy8vPolDnSflZFB-Z0mfeKh2n5r0fNIQZF7C3T17OY-8s78KmIcth0y3HgiiYZme97Gbw2SkcTlQM56zwjmxeoJy19Dj8xaONHfKgPxnYVSg7_DatzI7Oks5t22-MvUPmQHdqw4BUKUlDZEC_9dqdaGft8fWivMxfed_KTnFkji8W5RAHaLUy01ZKE6lXA-VevArE7irZuJLLAkCd_Le3mRG-X33YPbyabNtR1T9hINpHRHf7FX1jeoPgkenuqn4YxQZmqwD5D0gLe4eWDcr-frFdxY8k6FZyMDFpJp-8Pn1VXkdlHuXkCq7DNMBxEOZhdrW5Lkk-xVGRkWke4GqaQZzFaRCGaZBnaYDhil3jAEchDnGY4mmYTeg0zdMoJgUO44SksRcHsCWsnpiImQi5vrI3b6_TKcbhVU0KqJX9swWMdxlix4S9BTw3HfbiqOB-_0cLpmN6cyWv7Z3eol0rLw5qprQ6rKKZruG6u8sr-P7PHUilQSIP4x-7GI7xVSvr6__91rFV_78BAAD__06oO40">