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[LLVM-18.1.3] Parser CRASHING on requires expression #88081

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nyyakko opened this issue Apr 9, 2024 · 6 comments · Fixed by #93206
Closed

[LLVM-18.1.3] Parser CRASHING on requires expression #88081

nyyakko opened this issue Apr 9, 2024 · 6 comments · Fixed by #93206
Labels
c++20 clang:frontend Language frontend issues, e.g. anything involving "Sema" concepts C++20 concepts confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid]

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@nyyakko
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nyyakko commented Apr 9, 2024

System:
Windows 10 Pro 21H2

clang++:

PS C:\Users\Wellington> clang++ --version
clang version 18.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin

Snippet:

struct S
{
    S(auto value)
        requires (requires () { [&] -> decltype(value) {}; })
    {}
};

Backtrace:

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-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++23 <source>
1.	<source>:4:54: current parser token ')'
2.	<source>:1:1: parsing struct/union/class body 'S'
3.	<source>:4:33: lambda expression parsing
 #0 0x00000000036ae888 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ae888)
 #1 0x00000000036ac9d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ac9d4)
 #2 0x00000000035f5508 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fdf34242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000000000634a8c7 clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&, clang::QualType&, unsigned int const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x634a8c7)
 #5 0x00000000063779ed clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&, clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63779ed)
 #6 0x000000000637807f clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&, clang::CXXScopeSpec const*, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637807f)
 #7 0x000000000637d15d clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d15d)
 #8 0x000000000637d692 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::LookupResult&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d692)
 #9 0x0000000006382c3c clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6382c3c)
#10 0x0000000005e3b70f clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b70f)
#11 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#12 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#13 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#14 0x0000000005e1de3e clang::Parser::ParseDecltypeSpecifier(clang::DeclSpec&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1de3e)
#15 0x0000000005e588ab clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr<clang::QualType>, bool, bool, bool*, bool, clang::IdentifierInfo**, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e588ab)
#16 0x0000000005dc12ec clang::Parser::TryAnnotateCXXScopeToken(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc12ec)
#17 0x0000000005e01a00 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e01a00)
#18 0x0000000005e02d11 clang::Parser::ParseSpecifierQualifierList(clang::DeclSpec&, clang::ImplicitTypenameContext, clang::AccessSpecifier, clang::Parser::DeclSpecContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e02d11)
#19 0x0000000005e0319f clang::Parser::ParseTypeName(clang::SourceRange*, clang::DeclaratorContext, clang::AccessSpecifier, clang::Decl**, clang::ParsedAttributes*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e0319f)
#20 0x0000000005e5e170 clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5e170)
#21 0x0000000005e5ea5b clang::Parser::ParseLambdaExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5ea5b)
#22 0x0000000005e3bb4b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3bb4b)
#23 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#24 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#25 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#26 0x0000000005e53a10 clang::Parser::ParseRequiresExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e53a10)
#27 0x0000000005e3aa6e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3aa6e)
#28 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#29 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#30 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#31 0x0000000005e47f0d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e47f0d)
#32 0x0000000005e3b2c4 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b2c4)
#33 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#34 0x0000000005e4725a clang::Parser::ParseConstraintLogicalAndExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e4725a)
#35 0x0000000005e476fd clang::Parser::ParseConstraintLogicalOrExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e476fd)
#36 0x0000000005e1c282 clang::Parser::ParseTrailingRequiresClause(clang::Declarator&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1c282)
#37 0x0000000005e27609 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&, clang::VirtSpecifiers&, clang::ActionResult<clang::Expr*, true>&, clang::Parser::LateParsedAttrList&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e27609)
#38 0x0000000005e2ce13 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ce13)
#39 0x0000000005e2f7fc clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&, clang::ParsedAttributes&, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2f7fc)
#40 0x0000000005e2ff6e clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ff6e)
#41 0x0000000005e339b8 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e339b8)
#42 0x0000000005dffcee clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dffcee)
#43 0x0000000005dc3b37 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc3b37)
#44 0x0000000005dc4ab3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc4ab3)
#45 0x0000000005dcd152 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcd152)
#46 0x0000000005dcecc7 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcecc7)
#47 0x0000000005dcf2e0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcf2e0)
#48 0x0000000005dbdc9c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dbdc9c)
#49 0x0000000003f11195 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f11195)
#50 0x00000000041a65b1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41a65b1)
#51 0x000000000412c93b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x412c93b)
#52 0x000000000428a013 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x428a013)
#53 0x0000000000c4db5c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4db5c)
#54 0x0000000000c47b0d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#55 0x0000000003f59fe9 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
#56 0x00000000035f5933 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35f5933)
#57 0x0000000003f5a209 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
#58 0x0000000003f207e7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f207e7)
#59 0x0000000003f2119d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2119d)
#60 0x0000000003f2af8c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2af8c)
#61 0x0000000000c4afc1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4afc1)
#62 0x0000000000b2f084 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xb2f084)
#63 0x00007fdf34229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#64 0x00007fdf34229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#65 0x0000000000c4766e _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4766e)
@nyyakko
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nyyakko commented Apr 9, 2024

godbolt link to the failing code https://gcc.godbolt.org/z/jT8zedTax

@EugeneZelenko EugeneZelenko added c++20 clang:frontend Language frontend issues, e.g. anything involving "Sema" concepts C++20 concepts crash Prefer [crash-on-valid] or [crash-on-invalid] and removed new issue labels Apr 9, 2024
@llvmbot
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llvmbot commented Apr 9, 2024

@llvm/issue-subscribers-c-20

Author: nyako (nyyakko)

System: `Windows 10 Pro 21H2`

clang++:

PS C:\Users\Wellington&gt; clang++ --version
clang version 18.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin

Snippet:

struct S
{
    S(auto value)
        requires (requires () { [&amp;] -&gt; decltype(value) {}; })
    {}
};

Backtrace:

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-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++23 &lt;source&gt;
1.	&lt;source&gt;:4:54: current parser token ')'
2.	&lt;source&gt;:1:1: parsing struct/union/class body 'S'
3.	&lt;source&gt;:4:33: lambda expression parsing
 #<!-- -->0 0x00000000036ae888 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ae888)
 #<!-- -->1 0x00000000036ac9d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ac9d4)
 #<!-- -->2 0x00000000035f5508 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007fdf34242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x000000000634a8c7 clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&amp;, clang::QualType&amp;, unsigned int const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x634a8c7)
 #<!-- -->5 0x00000000063779ed clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63779ed)
 #<!-- -->6 0x000000000637807f clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::CXXScopeSpec const*, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637807f)
 #<!-- -->7 0x000000000637d15d clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::DeclarationNameInfo const&amp;, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d15d)
 #<!-- -->8 0x000000000637d692 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::LookupResult&amp;, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d692)
 #<!-- -->9 0x0000000006382c3c clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&amp;, clang::SourceLocation, clang::UnqualifiedId&amp;, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6382c3c)
#<!-- -->10 0x0000000005e3b70f clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b70f)
#<!-- -->11 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->12 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->13 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->14 0x0000000005e1de3e clang::Parser::ParseDecltypeSpecifier(clang::DeclSpec&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1de3e)
#<!-- -->15 0x0000000005e588ab clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&amp;, clang::OpaquePtr&lt;clang::QualType&gt;, bool, bool, bool*, bool, clang::IdentifierInfo**, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e588ab)
#<!-- -->16 0x0000000005dc12ec clang::Parser::TryAnnotateCXXScopeToken(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc12ec)
#<!-- -->17 0x0000000005e01a00 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e01a00)
#<!-- -->18 0x0000000005e02d11 clang::Parser::ParseSpecifierQualifierList(clang::DeclSpec&amp;, clang::ImplicitTypenameContext, clang::AccessSpecifier, clang::Parser::DeclSpecContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e02d11)
#<!-- -->19 0x0000000005e0319f clang::Parser::ParseTypeName(clang::SourceRange*, clang::DeclaratorContext, clang::AccessSpecifier, clang::Decl**, clang::ParsedAttributes*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e0319f)
#<!-- -->20 0x0000000005e5e170 clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5e170)
#<!-- -->21 0x0000000005e5ea5b clang::Parser::ParseLambdaExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5ea5b)
#<!-- -->22 0x0000000005e3bb4b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3bb4b)
#<!-- -->23 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->24 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->25 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->26 0x0000000005e53a10 clang::Parser::ParseRequiresExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e53a10)
#<!-- -->27 0x0000000005e3aa6e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3aa6e)
#<!-- -->28 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->29 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->30 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->31 0x0000000005e47f0d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&amp;, bool, bool, clang::OpaquePtr&lt;clang::QualType&gt;&amp;, clang::SourceLocation&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e47f0d)
#<!-- -->32 0x0000000005e3b2c4 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b2c4)
#<!-- -->33 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->34 0x0000000005e4725a clang::Parser::ParseConstraintLogicalAndExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e4725a)
#<!-- -->35 0x0000000005e476fd clang::Parser::ParseConstraintLogicalOrExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e476fd)
#<!-- -->36 0x0000000005e1c282 clang::Parser::ParseTrailingRequiresClause(clang::Declarator&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1c282)
#<!-- -->37 0x0000000005e27609 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&amp;, clang::VirtSpecifiers&amp;, clang::ActionResult&lt;clang::Expr*, true&gt;&amp;, clang::Parser::LateParsedAttrList&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e27609)
#<!-- -->38 0x0000000005e2ce13 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ce13)
#<!-- -->39 0x0000000005e2f7fc clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&amp;, clang::ParsedAttributes&amp;, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2f7fc)
#<!-- -->40 0x0000000005e2ff6e clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&amp;, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ff6e)
#<!-- -->41 0x0000000005e339b8 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e339b8)
#<!-- -->42 0x0000000005dffcee clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dffcee)
#<!-- -->43 0x0000000005dc3b37 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc3b37)
#<!-- -->44 0x0000000005dc4ab3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc4ab3)
#<!-- -->45 0x0000000005dcd152 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcd152)
#<!-- -->46 0x0000000005dcecc7 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcecc7)
#<!-- -->47 0x0000000005dcf2e0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcf2e0)
#<!-- -->48 0x0000000005dbdc9c clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dbdc9c)
#<!-- -->49 0x0000000003f11195 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f11195)
#<!-- -->50 0x00000000041a65b1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41a65b1)
#<!-- -->51 0x000000000412c93b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x412c93b)
#<!-- -->52 0x000000000428a013 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x428a013)
#<!-- -->53 0x0000000000c4db5c cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4db5c)
#<!-- -->54 0x0000000000c47b0d ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->55 0x0000000003f59fe9 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->56 0x00000000035f5933 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35f5933)
#<!-- -->57 0x0000000003f5a209 clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->58 0x0000000003f207e7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f207e7)
#<!-- -->59 0x0000000003f2119d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2119d)
#<!-- -->60 0x0000000003f2af8c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2af8c)
#<!-- -->61 0x0000000000c4afc1 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4afc1)
#<!-- -->62 0x0000000000b2f084 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xb2f084)
#<!-- -->63 0x00007fdf34229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->64 0x00007fdf34229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->65 0x0000000000c4766e _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4766e)

@llvmbot
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llvmbot commented Apr 9, 2024

@llvm/issue-subscribers-clang-frontend

Author: nyako (nyyakko)

System: `Windows 10 Pro 21H2`

clang++:

PS C:\Users\Wellington&gt; clang++ --version
clang version 18.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin

Snippet:

struct S
{
    S(auto value)
        requires (requires () { [&amp;] -&gt; decltype(value) {}; })
    {}
};

Backtrace:

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-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++23 &lt;source&gt;
1.	&lt;source&gt;:4:54: current parser token ')'
2.	&lt;source&gt;:1:1: parsing struct/union/class body 'S'
3.	&lt;source&gt;:4:33: lambda expression parsing
 #<!-- -->0 0x00000000036ae888 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ae888)
 #<!-- -->1 0x00000000036ac9d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36ac9d4)
 #<!-- -->2 0x00000000035f5508 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007fdf34242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x000000000634a8c7 clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&amp;, clang::QualType&amp;, unsigned int const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x634a8c7)
 #<!-- -->5 0x00000000063779ed clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::NestedNameSpecifierLoc, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63779ed)
 #<!-- -->6 0x000000000637807f clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType, clang::ExprValueKind, clang::DeclarationNameInfo const&amp;, clang::CXXScopeSpec const*, clang::NamedDecl*, clang::SourceLocation, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637807f)
 #<!-- -->7 0x000000000637d15d clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::DeclarationNameInfo const&amp;, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d15d)
 #<!-- -->8 0x000000000637d692 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::LookupResult&amp;, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x637d692)
 #<!-- -->9 0x0000000006382c3c clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&amp;, clang::SourceLocation, clang::UnqualifiedId&amp;, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6382c3c)
#<!-- -->10 0x0000000005e3b70f clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b70f)
#<!-- -->11 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->12 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->13 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->14 0x0000000005e1de3e clang::Parser::ParseDecltypeSpecifier(clang::DeclSpec&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1de3e)
#<!-- -->15 0x0000000005e588ab clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&amp;, clang::OpaquePtr&lt;clang::QualType&gt;, bool, bool, bool*, bool, clang::IdentifierInfo**, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e588ab)
#<!-- -->16 0x0000000005dc12ec clang::Parser::TryAnnotateCXXScopeToken(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc12ec)
#<!-- -->17 0x0000000005e01a00 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e01a00)
#<!-- -->18 0x0000000005e02d11 clang::Parser::ParseSpecifierQualifierList(clang::DeclSpec&amp;, clang::ImplicitTypenameContext, clang::AccessSpecifier, clang::Parser::DeclSpecContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e02d11)
#<!-- -->19 0x0000000005e0319f clang::Parser::ParseTypeName(clang::SourceRange*, clang::DeclaratorContext, clang::AccessSpecifier, clang::Decl**, clang::ParsedAttributes*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e0319f)
#<!-- -->20 0x0000000005e5e170 clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5e170)
#<!-- -->21 0x0000000005e5ea5b clang::Parser::ParseLambdaExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e5ea5b)
#<!-- -->22 0x0000000005e3bb4b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3bb4b)
#<!-- -->23 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->24 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->25 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->26 0x0000000005e53a10 clang::Parser::ParseRequiresExpression() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e53a10)
#<!-- -->27 0x0000000005e3aa6e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3aa6e)
#<!-- -->28 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->29 0x0000000005e3d859 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d859)
#<!-- -->30 0x0000000005e42a39 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e42a39)
#<!-- -->31 0x0000000005e47f0d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&amp;, bool, bool, clang::OpaquePtr&lt;clang::QualType&gt;&amp;, clang::SourceLocation&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e47f0d)
#<!-- -->32 0x0000000005e3b2c4 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3b2c4)
#<!-- -->33 0x0000000005e3d6ba clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e3d6ba)
#<!-- -->34 0x0000000005e4725a clang::Parser::ParseConstraintLogicalAndExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e4725a)
#<!-- -->35 0x0000000005e476fd clang::Parser::ParseConstraintLogicalOrExpression(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e476fd)
#<!-- -->36 0x0000000005e1c282 clang::Parser::ParseTrailingRequiresClause(clang::Declarator&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e1c282)
#<!-- -->37 0x0000000005e27609 clang::Parser::ParseCXXMemberDeclaratorBeforeInitializer(clang::Declarator&amp;, clang::VirtSpecifiers&amp;, clang::ActionResult&lt;clang::Expr*, true&gt;&amp;, clang::Parser::LateParsedAttrList&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e27609)
#<!-- -->38 0x0000000005e2ce13 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::ParsingDeclRAIIObject*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ce13)
#<!-- -->39 0x0000000005e2f7fc clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&amp;, clang::ParsedAttributes&amp;, clang::TypeSpecifierType, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2f7fc)
#<!-- -->40 0x0000000005e2ff6e clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&amp;, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e2ff6e)
#<!-- -->41 0x0000000005e339b8 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e339b8)
#<!-- -->42 0x0000000005dffcee clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dffcee)
#<!-- -->43 0x0000000005dc3b37 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc3b37)
#<!-- -->44 0x0000000005dc4ab3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dc4ab3)
#<!-- -->45 0x0000000005dcd152 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcd152)
#<!-- -->46 0x0000000005dcecc7 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcecc7)
#<!-- -->47 0x0000000005dcf2e0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dcf2e0)
#<!-- -->48 0x0000000005dbdc9c clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5dbdc9c)
#<!-- -->49 0x0000000003f11195 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f11195)
#<!-- -->50 0x00000000041a65b1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41a65b1)
#<!-- -->51 0x000000000412c93b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x412c93b)
#<!-- -->52 0x000000000428a013 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x428a013)
#<!-- -->53 0x0000000000c4db5c cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4db5c)
#<!-- -->54 0x0000000000c47b0d ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->55 0x0000000003f59fe9 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->56 0x00000000035f5933 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x35f5933)
#<!-- -->57 0x0000000003f5a209 clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->58 0x0000000003f207e7 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f207e7)
#<!-- -->59 0x0000000003f2119d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2119d)
#<!-- -->60 0x0000000003f2af8c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f2af8c)
#<!-- -->61 0x0000000000c4afc1 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4afc1)
#<!-- -->62 0x0000000000b2f084 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xb2f084)
#<!-- -->63 0x00007fdf34229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->64 0x00007fdf34229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->65 0x0000000000c4766e _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc4766e)

@shafik
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shafik commented Apr 9, 2024

Confirmed: https://gcc.godbolt.org/z/x1zMb783P

Assertion:

clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:304:
T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type) [with T = clang::sema::FunctionScopeInfo*; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::reference = clang::sema::FunctionScopeInfo*&; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type = long unsigned int]:
Assertion `idx < size()' failed.

Using assertions build is usually more helpful, since if it asserts it usually will be a better pointer to the real underlying problem.

@shafik shafik added the confirmed Verified by a second party label Apr 9, 2024
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zyn0217 commented Apr 9, 2024

I presume #78598 was supposed to fix this issue (and other duplicates) but the author gave up anyway.

@zyn0217 zyn0217 mentioned this issue Apr 17, 2024
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l1nxy commented Apr 23, 2024 •
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There is another example that cannot be resolved by #78598 as they are different.
#69307 only captures the scope variable in an unevaluated context, whereas this issue involves a lambda expression in an unevaluated context.
I am unsure how to fix this.
CC @shafik @cor3ntin

@zyn0217 zyn0217 mentioned this issue May 23, 2024
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@zyn0217 zyn0217 closed this as completed in 3d361b2 Jun 4, 2024
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c++20 clang:frontend Language frontend issues, e.g. anything involving "Sema" concepts C++20 concepts confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid]
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[Clang][Sema] Tweak tryCaptureVariable for unevaluated lambdas zyn0217/llvm-project
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@shafik @EugeneZelenko @l1nxy @nyyakko @llvmbot @zyn0217