<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/69213>69213</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: 18: Assertion `Init < getNumInits() && "Initializer access out of range!"' failed.
        </td>
    </tr>

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

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

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

<pre>
    Compiler Explorer: https://godbolt.org/z/Kb6PM7fon

When compile this program with clang (version ab737a86993bc7bf92cbb9d51f47f8825a717333), clang crashes:
```
int foo_ptr;
foo (void)
{
  *foo_ptr = (int) {{}, 0};
}
```

Stack dump:
```
<source>:2:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
    2 | foo (void)
      | ^
      | int
<source>:4:3: error: indirection requires pointer operand ('int' invalid)
    4 |   *foo_ptr = (int) {{}, 0};
      | ^~~~~~~~
<source>:4:21: warning: too many braces around scalar initializer [-Wmany-braces-around-scalar-init]
    4 |   *foo_ptr = (int) {{}, 0};
 |                     ^~
clang: /root/llvm-project/clang/include/clang/AST/Expr.h:4905: clang::Expr* clang::InitListExpr::getInit(unsigned int): Assertion `Init < getNumInits() && "Initializer access out of range!"' 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-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics <source>
1.      <source>:4:27: current parser token ';'
2.      <source>:3:1: parsing function body 'foo'
3.      <source>:3:1: in compound statement ('{}')
 #0 0x000000000372f498 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372f498)
 #1 0x000000000372d15c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372d15c)
 #2 0x0000000003675a78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f588e929420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007f588e3ec00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007f588e3cb859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007f588e3cb729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007f588e3dcfd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x00000000065db074 clang::InitListExpr::getInit(unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65db074)
 #9 0x00000000065f09d1 (anonymous namespace)::InitListChecker::CheckExplicitInitList(clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, clang::InitListExpr*, bool) (.constprop.0) SemaInit.cpp:0:0
#10 0x00000000065f0c7e (anonymous namespace)::InitListChecker::InitListChecker(clang::Sema&, clang::InitializedEntity const&, clang::InitListExpr*, clang::QualType&, bool, bool, bool, llvm::SmallVectorImpl<clang::QualType>*) SemaInit.cpp:0:0
#11 0x00000000065f215f 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+0x65f215f)
#12 0x00000000063b08a9 clang::Sema::BuildCompoundLiteralExpr(clang::SourceLocation, clang::TypeSourceInfo*, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x63b08a9)
#13 0x00000000063b1258 clang::Sema::ActOnCompoundLiteral(clang::SourceLocation, clang::OpaquePtr<clang::QualType>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x63b1258)
#14 0x0000000005f0b632 clang::Parser::ParseCompoundLiteralExpression(clang::OpaquePtr<clang::QualType>, clang::SourceLocation, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f0b632)
#15 0x0000000005f13dac clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f13dac)
#16 0x0000000005f080e5 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f080e5)
#17 0x0000000005f0a1ca clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f0a1ca)
#18 0x0000000005f0b87d clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f0b87d)
#19 0x0000000005f0eee9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f0eee9)
#20 0x0000000005f89ab7 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f89ab7)
#21 0x0000000005f8014d 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+0x5f8014d)
#22 0x0000000005f80f88 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f80f88)
#23 0x0000000005f81ec9 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f81ec9)
#24 0x0000000005f837ea clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f837ea)
#25 0x0000000005eb1501 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eb1501)
#26 0x0000000005ed8a18 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ed8a18)
#27 0x0000000005ea596b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea596b)
#28 0x0000000005ea609f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#29 0x0000000005eada44 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eada44)
#30 0x0000000005eae26d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eae26d)
#31 0x0000000005ea131a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea131a)
#32 0x000000000499b538 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x499b538)
#33 0x00000000041fefa9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fefa9)
#34 0x000000000418044e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x418044e)
#35 0x00000000042de12e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42de12e)
#36 0x0000000000befa56 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbefa56)
#37 0x0000000000be731a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#38 0x0000000003fdc649 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 0x0000000003675f24 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3675f24)
#40 0x0000000003fdcc3f 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 0x0000000003fa4e05 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa4e05)
#42 0x0000000003fa586d 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+0x3fa586d)
#43 0x0000000003fad795 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fad795)
#44 0x0000000000becefc clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbecefc)
#45 0x0000000000ae7091 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae7091)
#46 0x00007f588e3cd083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#47 0x0000000000be6dfe _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe6dfe)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkm99z46iTwP8a5YWSS0K_H_LgOPH3m93Zy9x46vbRhaSWw40MWkCZZB_ub78CJMcotpOd1e5t1blmEkuCpvtD0zSIECnpjgFce8mNl9xekV49cnH9nYJQnF2VvH65XvF9R1sQ6O65a7kA4UVL9KhUJ71o6eG1h9c7Xpe8VQsudh5e_-7h9c9l-vmXrOHMC269YGl__voIDFVWHFKPVKJO8J0ge_SdqkdUtYTtkIfzJxCScoZImUUZydOiiMoqK5sCV2VZ1EnYxFmT5zghWZhFUeThwsOroX4liHwEo5ttOg2Gf-aSMoUazredEl50Y-81nJtmOa21KFstGx4i5OHlUAN50a0uSZnycIF0Gf3vVrce6N-jRP39VOv250aR6huq-313TksvWkneiwq86M6LltiLlqHGDkJww1-9dIBkBxVtKAi0p1JSttN61NCQvlUSKW1UZlTNvOgG3W8e0KooEGE1aokCgWqOGFdI9l3HhUJ037W0ogppRl5y4_863vG1lOR2BIIQRl62Qqe4IfPRT73kbnpLizllX-xFy8ixj7KaCqiUdgMBv_VUgEQdp0zrzTsQ2goP5wcLEWVPpJ0oEptWf6gHHTv-x37O6o5N53wngulO0N3DOdoT9oJKQSqQiAjesxrJirREIMqooqSlv4OwnHVR3xb1bVHfFvV1UYf8nzHJ1nz70RbaImYIaQM8vBacKw-v2_Zp73eC_zdU-tKWwGvKqrav4ejOcvPVw-u7504sHjWXIki0pFGkFy31Mw87t-4ZVZ-oVOaRubMDpW96OO-ZCU41spZpYUspQRin8NJAF0NetEI7UP_R7_WlNC5RIA-nHk6Rh_H9EWtSVSAl4r1CvEGCsB14OPQw1v7TENpCvbAcPn-6W27ukOzLPVWIoLLfIQFmlCg-DX5UPfblouL7gdZbaFTKHqSH12bwDeiQegQbrVBJqm9Kd7_us05AJ7jWFGo0eBpemZpESl5RoqBGomdIVoJ2anE2qAQLLyg-DyGWiF2_B6bk0L28M905BHcfxuA-dKhPRtTSV6Jn3zy8LikbHyN_V38novFj5O-Qr-PAmnSdlturrlcLify9poB8_zlPfSL3vnxhijx70a0exS3yN8j3d1XlK87b6pFQ5kW3FxXThYsFXgTIbyrecuHXlOwYl4pWEvkN477h6dx2hqvBEmosp0ZxZvy1FwKYQh0REgRS_BswZEOo_mkk4BMSojFG64qU7VDTMxu_9CyqJTScHyRElyRQO0vakKGIAt1vQ7Qbx3b2Gug8HAUoeA7GT5ThJi5yZHzRjCn5Iu2Xz4IyZTzlq3W3_LWQIN-3XCoBZG-GzwqNEUU3_Cf9xcM3wfOgmKN5ONG8DpPqlOarFgjruwe2oTtG2uPw0HItf149tRqOntjRM80SkuVopb3tC1T8CcSLVezfhNWtbm6Mx06ZFWcKntWi6vQoDcz_QxPR0ETWJHkOBS5iHKDtVoBUXMBWDC6wbmnp4fVznm7T2G8p65_9Hevtg049CiD1QvJFYGwJ4xgHjiWx00wEVRCUSBAq4QPyKy05NZLjKAhKR3LiSq7KPCkQKfmHND-SjHGeFI7kdCo5O_T3h2Vm2JWZuTLrqqnTPyYzipo6dWTmx16SJnUZZPEPTnfzufOgh6No4SraBEUd6hYJ4-xlz3uJGNmD7EyQKFzlV49QfYNBf3OhVwY6TxxLeDifGG2n4PqOKapeUMWZLpQesvYTdPBy8vQ_e9J-fengQ_VKztsB4sK01gne6SFRoA3sia7xdhDqcBRMwVQZ_BCY6U0HidbhtB3zg7Io3v5-DbKbPWnb_4JKcXG_71ovWp2SFt2Zpt4DGE4A4jBpThpJtNdu4LcemJ4BzfQEouFiPzur1_Z-pqx2Sr5S-KVXpGxhKQR5-QKNS2EkrSGcgb2cedAacq_rURyFzhyURmWQkwJNSZlvNz1t69WQQ3yiCgRprQkOWZN8fOKVQTMxTBtlC9yzhr_1souVD445JxFrsEMkmhAJcZKfJrKs1AObEPkDNB468lsPn5W4MDj-z_Fo6x088TGepAnKNMLHenw2Oe7R9xMuA1IaA_K_jMb04YxQBpsdKIkLJYxqUl2E8pkIYOdQTEoDMzceOmvKyQD8B0FOA9oUVzozMQPEIZZO3CgPILnsRsTOTe8B0-XMtQ7Lb1FNLT-uqvHo6hu9Pnpbdd6xNdjsQMkmUEhYkb8Wyj-EhDbUIZFPo0ye1RdJfPn35qG5oYyIl3NAlmbp_AVk36rTMzFeISX6E7GmE1DZb5_gCdrZ40me1Y75xcR8ACgumv8RJ5h06rwmaA2PTcCBa0JekDJ714TNuDNxMSBKqDdqr4aF78yWGEUdS8KJJUEYX_bFgxUP4haqlggTVZeNArFUStCyVyCdfZKjbNn1TG3n4JkR7k_G7nfgXIzz0wTM1j9W8mRr0xLzdoDm63QAnnZAk-c_0AH_FOIz02pyJ0HD0YRWCNXl2DEmaAdqN7x-8XB-tN6dTVutjKPtJJ3MowwuT3nrYQt0qu1RHd3nZ3zb8ZKKDwvaeW3UJjg2utkhlGEShB-y8RYa817nVFSnbDf6Nhcf8dGvsO9aoszS69zC9rjWJ6LgdbTbLZiZvdeicFi5eSHUOQkvj3UN4V-C991ZRJsOqremvsI7PXDfD4UfCqaDqmsuvhC2A7svNzdGQ8nB6GaSQJIiLd_F-CCOHO-eKRBsuqD9wQniTYmLXbM079Q245vomWEZFg6sfAIrDYrmXVjDpOIwOztYZ0c29bXTyBYdEcruUFobTm6v4WJif03i-J1UzfqGO7n-DTbP6wjazmNHcF95JUAAp5czva-8MwsCO-N8YDvjEK3MbuCplfhhd-kXXvct3O87LsaUfeapyhroEAgnBMIofDsdm7fyZ7ZT3YXivNpqZRxtncQwLooyiZzJYsVr-Bcwu_Abl3pQ9QqGW-Ob_Zl0HFRwdHTSsThsoHE3WNdCTz-sPqHk7OrZ1h31Yle9PIhjcBHaBu-ZVOSwqT6leN6emX120NAxwUmvYlxDiMHdGTXKvlrydJiy80uWzhxwBs0c1Z1sJyihIUmKqirc7gl11yvHrxAeiRgTuMPbA-ceXiF7gGpeC6x-jgHZxIBMx4sR-Cr8aqLA6WXX-FrojTWTdyhaxpCiHaWtBaoFfTozo7nvTKOmrtK4MEiO5I5nKbbCUDVP7YizRye8aFmRti1J9W3bMDeM27YHv1mFK77fE1ZPB-_J3pNqKMfNfi7RDI74KEHZbpgcbNceKmy31fNzGNqLkkhabaUpPlB0CusbWyUIVXJ8PBFH2laPA7v-HZ4P7-OcfT7L3FTxcNaSfVkTc1ZkRIXz8bTET7w83R_F9KRDg-Ojrjh1nsE--dKzDWmgfXFwXu66WY9tWF2PfT4Ops5VRU66-P_OOSap5jkviN1zOQ2JIUjOgjO9Rt7MiSNNJ3RPKuoC51a4F4ounRTmyLaZXMka7LgSnhBJcjfh_AiRn3gpz-P4iZd66X7m_fTbcHzwgI5Q3fnm4MjHCQ5u8hdz1JgcjtGEY50VZz3r9ui7kxqcyAnO8f8bOc4ZzCwYh1w8mcAraIY3l2MOMmpugshyCAHvT88zZh1aJ0dpJ-MLCGRBESKt7nytWqFOq9MDY3WQR2i7bWmpYy0RanukwkePkMVBHjmtTDOqtG4AWflzMtViD-2OXvl6Vt7cQc2Qy6Nq8E97oNn-aQU8U93jNaAwirVqvQTkPyHFkQRA9CjNLiZ_kHBVX0d1ERXkCq7DtMjiNI2T7OrxOitxAHkdlBmEmGRpGAVlmTUkLdKwzIvsil7jAEdhEKZhjLMoW-A4L4AEeR7jJk-yyIsD2BPaLrSHLrjYXZmD0tdpgcPoqiUltNL8ZQrGAw7sJbdX4tocry77nfTioKVSyVcJiqoWrg-QwvzvOTZ-1Yv2-sfPhRuL_zcAAP__MNneRA">