<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/95669>95669</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            ICE on function with decltype(lambda()) argument type
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    This program
```
int f( auto && p, 
 decltype([q=decltype(p+1)()](){return q;}()) )
    { return 0; }

int main() {
    int i = 0;
    return f( i, 0 );
}
```
is accepted in GCC and MSVC, but Clang crashes:
```
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-18.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0 -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 -Wall -Wextra -pedantic-errors -stdlib=libc++ <source>
1.      <source>:2:47: current parser token ')'
 #0 0x000000000351ae38 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x351ae38)
 #1 0x0000000003518f84 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3518f84)
 #2 0x0000000003467018 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007cb434442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x0000000006a917d0 clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a917d0)
 #5 0x0000000006a7c1fb clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a7c1fb)
 #6 0x0000000006a9345b clang::ASTContext::getTypeInfoInChars(clang::Type const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a9345b)
 #7 0x0000000006a93511 clang::ASTContext::getTypeInfoInChars(clang::QualType) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a93511)
 #8 0x0000000006ef6529 (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutField(clang::FieldDecl const*, bool) RecordLayoutBuilder.cpp:0:0
 #9 0x0000000006ef7fa7 (anonymous namespace)::ItaniumRecordLayoutBuilder::LayoutFields(clang::RecordDecl const*) RecordLayoutBuilder.cpp:0:0
#10 0x0000000006ef278b clang::ASTContext::getASTRecordLayout(clang::RecordDecl const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6ef278b)
#11 0x0000000006a922eb clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a922eb)
#12 0x0000000006a7c1fb clang::ASTContext::getTypeInfo(clang::Type const*) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a7c1fb)
#13 0x0000000006a93055 clang::ASTContext::getTypeAlignInChars(clang::QualType) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6a93055)
#14 0x0000000005d81c49 clang::Sema::CheckArgAlignment(clang::SourceLocation, clang::NamedDecl*, llvm::StringRef, clang::QualType, clang::QualType) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5d81c49)
#15 0x0000000005de3852 clang::Sema::CheckFunctionCall(clang::FunctionDecl*, clang::CallExpr*, clang::FunctionProtoType const*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5de3852)
#16 0x00000000064b5552 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x64b5552)
#17 0x000000000615ffce clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x615ffce)
#18 0x0000000006165a4c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x6165a4c)
#19 0x0000000005c17df3 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c17df3)
#20 0x0000000005c0e671 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c0e671)
#21 0x0000000005c1197a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c1197a)
#22 0x0000000005c11b19 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c11b19)
#23 0x0000000005c16fa9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c16fa9)
#24 0x0000000005bf311e clang::Parser::ParseDecltypeSpecifier(clang::DeclSpec&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5bf311e)
#25 0x0000000005c2be9b clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr<clang::QualType>, bool, bool, bool*, bool, clang::IdentifierInfo**, bool, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5c2be9b)
#26 0x0000000005b999bc clang::Parser::TryAnnotateCXXScopeToken(bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5b999bc)
#27 0x0000000005bd8750 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5bd8750)
#28 0x0000000005be86b2 clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&, llvm::SmallVectorImpl<clang::DeclaratorChunk::ParamInfo>&, clang::SourceLocation&, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5be86b2)
#29 0x0000000005beaaa3 clang::Parser::ParseFunctionDeclarator(clang::Declarator&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&, bool, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5beaaa3)
#30 0x0000000005bec5d2 clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5bec5d2)
#31 0x0000000005be568c clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5be568c)
#32 0x0000000005cff961 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5cff961)
#33 0x0000000005be284f clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5be284f)
#34 0x0000000005b9c4a9 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5b9c4a9)
#35 0x0000000005b9d011 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5b9d011)
#36 0x0000000005ba53af clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5ba53af)
#37 0x0000000005ba6f27 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5ba6f27)
#38 0x0000000005ba7540 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5ba7540)
#39 0x0000000005b9638a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x5b9638a)
#40 0x0000000003d5a725 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d5a725)
#41 0x0000000003fe2aa1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3fe2aa1)
#42 0x0000000003f6010b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3f6010b)
#43 0x00000000040c2473 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x40c2473)
#44 0x0000000000c19746 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc19746)
#45 0x0000000000c1211d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#46 0x0000000003da1979 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
#47 0x0000000003467443 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3467443)
#48 0x0000000003da1b99 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
#49 0x0000000003d69d17 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d69d17)
#50 0x0000000003d6a6cd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d6a6cd)
#51 0x0000000003d7445c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d7445c)
#52 0x0000000000c16a21 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc16a21)
#53 0x0000000000b0fa84 main (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xb0fa84)
#54 0x00007cb434429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#55 0x00007cb434429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#56 0x0000000000c1191e _start (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc1191e)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
Online demo: https://gcc.godbolt.org/z/vdb6hMThc
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkW91y47aSfhr6BiUVCf5f-EKWRllnZ9azI9fJuXOBIChhTQIMAHrkffotAJRE0JLsk3AmmzqpTJnC79dfNxrdIIikpFtGyK0X33nx6gZ1asfF7ZqU4qbg5evt445K0Aq-Fajx_JXnL7zE7_83PylToPJgBlCnOPBg4sEEtB5cAlsPSoJr9doSD2ZefPe7F64GJa0H7wIP5roS5l686h_SO0FUJxj43QvvvPRQDHOg_9iBAQBeegf6hr4X3gHd0oI8YmsQZba3bn3qquso8MKV6Xkq74czIlEthm-mPDQ5zTCiQQKEMWkVKQFl4JflEiBWgi-bfyz1IEWnwLJGbAuwQHJHpBcuzo7z9fOnxeYTkF3RUAUQKLotEKTlQgHFwU6p1nSFaw-ut1TtumKOeePBdV2_HP7MWsH_h2DlwTWVsiPSg2uDhjJcdyUBakcsDlAg_KwEwkSDbAVpBcdESlICyTthi3VPJCXHFGnpRMeAxIK2am4hbxTCz6DsmvYolD_3_PyrtRqAxLZrCFMaOPDgmrcaGeZNS2siZmTf1lwQocs0Q7Mgmwdz34PrQmvOFnrwzoN3YLYtvyNRzSIw24KZNrc1als9ZqfaTs0lmDWaATCb7bNkhmQzk69Mob0XrihTpAazDZjNthjPFOc13mnjCFdXQenGQTiHcx_MKsxrLmYlRVvGpaJYglnF-MyQ6RZLVXrhClvg0Aez31Bdg9lvZK8EArOWlIgpimdECC5s-5oWXriqadH3Al647NUQfrLEBppYpzhcQC9cRKkmF3dCEKZAi4QkAij-TBjwYGqWTtrbuAdDH_h7__BfGAeIhBkwBhQuvHAhX6V9-CooU0a9j9ZGslMjgb4_cakEQY1Z9Eu9ouwCzf6Ukj145-97UKfF7sEwGKHOqiw6h3pZE8S69oFt6Jah2oNZx4yXK0HN9SzTYdQQHIzQwRglqR9kYKmt4xvB_IWIVwvqPxAraz1V1rPmtFlypshezXGrl5Rv_h2nCPspUlxEYRRFMIZ-L5A2ILjeZ8lTEs1qyrr9bMs6W4Hnks8TA9x0cWBHQ9gJyoO09IGV11C62Dz2mOzvLVGPry25ZxW_b1pN8aCxrgGYM6k8uNCymedpOO-xOeBjF3yKg6r4IPifCdzgcoAnI9bDKP4o8Hu23CEhfyrxGp6DPx3jj4Pgz-D_7w7VjyYumBx6HAQO9MyBTqoktl4BMc5eG95JwFBDZGu8Xm7h3SvEaNfoRSrKz-iVd-quo3VJhK23RWtK6tKVyxStCK4HylmCgvNaS3pmvPMLPx9hTiuUToh5pAzbZYT6g2i1s_ZHaGGavWfci83jcPgP4ZnSTizIo51oKYKRiUNIPrxEf7Zj1Ngc8PDv6Bg18HDsWPw4_gDwRU237Gd7Fj-OHezOVhqXWYCjfIh9QxrUxyk7gp8XYmtg6wDZxbwxId5njpGinGmPMaj8L9QQsxh6Z3IKgzZKULb9RqpRjxMFF4oniop6kR1OYpcTEmYxvMLJumNYy7xE9WgFHWoGkg9qdftP-1a8rTn0-yq44m-seSK5jViO3O4GHxVxfElu40o1_kf-UOjc7aFa1khKqxrHLDDXRWMJz8v91oZOhvKlU6ioyUII9KrNJVyeGS789M6IE7HXk-Ow54YXQVxVmLzDnoX9_5iuSyBsMHAKCqYh1XLmkOoGPkESowifJ3WB1QP7G5M6GYmGI4dEJxKLcZCWVTjE8NXk34Pnr1yqiu41NiIl5WzTVRXdu6wujIv6RmRXq_NMwCVQojNp_2Ruy6Ifigd9VzyfJGlwVbwlkuokmyvVsLFuZ37_J2XlW7NPRqocdtWOUHffKKTI264T-nErr0NIMNJ3kKfoxxLy17NghHRYgGMWiiC_ysLCHC7ryOYjXIxkm1CQInDCERiOBEkqdF2QvxS-RufAdyPMogqDgFyFv-rP2zctwbSiZOTNdbWuMgtwKtwWloPbjQIxLEheXMX90GqHiOrlP_9pdpwL-IfVb53IQ4t-78hXJVyXeox77e7irqPBejq7JO9LwpRBYnOlxY_cxXumHCoT1wTyPC_wRZ8hXheMcW2WB6Ye-TPRpjwtTgvDwZm6OMssjf13TRUJs68ftS2vmOtFT2mey0fStDVSJqU9hPzjXguMiZQD27o45mHmQ-55ueVnpIhFsFBKfKbHQ5-hETVtTTE1mStDDTmOOpk-DN2OPjJXHyRLCng9cEECNUQRMVDMskadJG-Voqu5uEKOIYMWnSKyV8MgbW1QXf-DYMWFOThxFutg9F3Hno9DosasP72Ex1odx4jJ9OvS0ufwm4_4RQhdDwyHCa2V8BKvF8z9LaeDFneoRgyTckVq2lBFxKNA-JkIh47padFSD2lx3zfFBcFxed3sVlQQrD5IynTANS4HeDACHifZRT_r-C8u7pkiwr5-uqbPF05LcDmqsDHddfGnZEAL6DAwCvqqKk-C8_mi6NhvVO1MZoMp6V8cbuxx9PWDrZMbqPr18CRMNnhgx5xnT5n0GDkcQcORqmEWVe-q-hfBu_at9ijbXt6l_qCrvELgeGcZQl1z8Q2xLblndNrjLsuQQ-EoMM1x9E5cral4ECcfWJ1fNO8z8rEWV9XyJgyYLizSPDhExSOiSj-4nmAPdl-HL8qoOp-VTE3X2MZ-IF2aDYeuUbSL4hBdX5qf9taMBrT9HIomI8HI6JAwCqVRUsH0KgmPvP1MXkhtz8qz91Oio0MzJ3HnYqqjr__Cy64m903LxSHhnXIjNsI50o8CV5TG0fVEYk2FVH9nCrSEDgWj2DJPwuztIdRi8zjabDXgHxruGSBDpJF7vaiMUQqd13dLXpJfCLPnnYcTToI7Rfqi_rreJJd07PQOPvciUUUgQo77XQu9MbPyDMBJodmZHWju_aEq8QO_cKmzk90zqXRof569y7JMaKM9Oge-E0RFPoZRGrqH8wboSYqXYxCTXZNyQt_ao3JgO4GLj4M8jRKAcfDUXx49xafDNxU7JE6vEfuXFE5ZH95Pid5ic8DHI_AwCEpwIHoZPJrVnl3NtN9IMkrO9Rh9sDo4RclBKejLhfsfUeI6ARTkaW6znY9G-6YJRnVdIPz8VDHXVdu5e3tZBkveNIiV48V6VnPmaqYu4_0Boxcuz71A1xiMWo8dnp7wfh8E9keBJMVP0jTvWXQa64InJRBV8lA9Gg7VtbZ_Lgb1uslidKRvOe8TwrRGTVEic63zmBhlh5uNv_LivD7S8c3EKAoHqjh3_9DWfOvYBlWkfnXo_DmJWo_TsfdsbFhF7mQZ_3aGoamet0goTeQVC8hd4pK8DNKLxBmNoTf734FNx12POuoGlw5brzRdjA7pJryn0ws7NKN4FKQkKMHlv8rGr7yQl6n4lRefqVQOFdfc8FH7LaJa8eZm8MfZ603kB3KoKXI4dAOpMo2iGF_Cuxo8O2HAmf3_Evc_kcPJwk9DisMaHG3YCYJ9-HmINw6ojeNYvLnidWk7nijC0HgcwE5U5xd-hbLIfFczzYx2QGfGyL3jDvMy_xfvuJsuzpjxeEwS-eDpSXd7kgoJ9TQQ6cOzEDdLi5ORcoM8IMCOP5V-9JDHOYfV4QKYr0nMpyC6HFR99A9wb-kVojUpwXeqdoDsqbafkoAgNMbTSQJmL0BxIAkBdBCc95Md4vL-Iymi15rufPZLpgdWU0ZASRqum40-XcJ4vuVlwWs152LrwfX_enD9UhbJ7svjDt-Ut2GZhzm6IbdBGmRRGsQwutndJhWGPoJxFIQVhIjkVZJkBAVVkfokjdANvYU-jPwkiIM0gH40D7I8LjDJorLKstDPvMgnDaL1XK8nPfeN-UbqNo-TJL-pUUFqab6Gg5CR78BUehB68epG3Jqvq4puK73Ir6lU8jSKoqomt_fLT4AzcIiOLNGD790Osdvha7bDt1FA1990or794594WQlebuH_BQAA__948K4Z">