[Clang] Assertion when including a header that does not exist

[Sirraide]

This asserts on main (https://godbolt.org/z/KMxazTaj1) in C++20 mode or later:

#include <concepts>
#include <foobar> // Or some other header that doesn't exist.
#include <ranges>

Interestingly, it doesn’t seem to matter whether libc++ or libstdc++ is used, but removing any of the #includes fixes the crash, and which headers are used does seem to matter.

Stack trace:

<source>:2:10: fatal error: 'foobar' file not found
    2 | #include <foobar>
      |          ^~~~~~~~
clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:322: T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::back() [with T = clang::Sema::CodeSynthesisContext; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::reference = clang::Sema::CodeSynthesisContext&]: Assertion `!empty()' 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++2c -stdlib=libc++ <source>
1.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:185:26: current parser token '{'
2.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:30:1 <Spelling=/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__config:871:39>: parsing namespace 'std'
3.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:30:1 <Spelling=/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__config:872:39>: parsing namespace 'std::__1'
4.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:53:1: parsing namespace 'std::ranges'
 #0 0x00000000039246a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x39246a8)
 #1 0x000000000392238c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x392238c)
 #2 0x0000000003868c28 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f76fd442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f76fd4969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f76fd442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f76fd4287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f76fd42871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f76fd439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006d59d1a (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d59d1a)
#10 0x0000000006d59d7d clang::Sema::SubstTemplateArguments(llvm::ArrayRef<clang::TemplateArgumentLoc>, clang::MultiLevelTemplateArgumentList const&, clang::TemplateArgumentListInfo&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d59d7d)
#11 0x00000000064721e3 substituteParameterMappings(clang::Sema&, clang::NormalizedConstraint&, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&, clang::ASTTemplateArgumentListInfo const*) SemaConcept.cpp:0:0
#12 0x0000000006472120 substituteParameterMappings(clang::Sema&, clang::NormalizedConstraint&, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&, clang::ASTTemplateArgumentListInfo const*) SemaConcept.cpp:0:0
#13 0x00000000064803fd clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64803fd)
#14 0x00000000064802c1 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64802c1)
#15 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#16 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#17 0x000000000648033a clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648033a)
#18 0x00000000064802c1 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64802c1)
#19 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#20 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#21 0x000000000648033a clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648033a)
#22 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#23 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#24 0x0000000006482571 clang::Sema::MaybeEmitAmbiguousAtomicConstraintsDiagnostic(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6482571)
#25 0x0000000006bb31fd void checkTemplatePartialSpecialization<clang::ClassTemplatePartialSpecializationDecl>(clang::Sema&, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#26 0x0000000006c84877 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::Sema::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&, clang::TemplateIdAnnotation&, clang::ParsedAttributesView const&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::Sema::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c84877)
#27 0x000000000622b2e0 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-assertions-trunk/bin/clang+++0x622b2e0)
#28 0x00000000062036b5 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62036b5)
#29 0x00000000062c09ea clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62c09ea)
#30 0x00000000062ce312 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#31 0x00000000062ce5d7 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62ce5d7)
#32 0x000000000620a1d0 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a1d0)
#33 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#34 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#35 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#36 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#37 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#38 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#39 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#40 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#41 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#42 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#43 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#44 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#45 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#46 0x00000000061c739d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c739d)
#47 0x00000000061ba07a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61ba07a)
#48 0x00000000041c0aa8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c0aa8)
#49 0x0000000004440169 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4440169)
#50 0x00000000043c985e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43c985e)
#51 0x00000000045231ee clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45231ee)
#52 0x0000000000c296ec cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc296ec)
#53 0x0000000000c2297a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#54 0x0000000004203a19 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
#55 0x00000000038690d4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x38690d4)
#56 0x000000000420400f 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
#57 0x00000000041ca3a5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41ca3a5)
#58 0x00000000041cae0d 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+++0x41cae0d)
#59 0x00000000041d2b75 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41d2b75)
#60 0x0000000000c26b85 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc26b85)
#61 0x0000000000b1d084 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb1d084)
#62 0x00007f76fd429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#63 0x00007f76fd429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#64 0x0000000000c2246e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc2246e)

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: None (Sirraide)

This asserts on main (https://godbolt.org/z/KMxazTaj1) in C++20 mode or later: ```c++ #include <concepts> #include <foobar> // Or some other header that doesn't exist. #include <ranges> ```

Interestingly, it doesn’t seem to matter whether libc++ or libstdc++ is used, but removing any of the #includes fixes the crash, and which headers are used does seem to matter.

Stack trace:

<source>:2:10: fatal error: 'foobar' file not found
    2 | #include <foobar>
      |          ^~~~~~~~
clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:322: T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::back() [with T = clang::Sema::CodeSynthesisContext; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::reference = clang::Sema::CodeSynthesisContext&]: Assertion `!empty()' 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++2c -stdlib=libc++ <source>
1.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:185:26: current parser token '{'
2.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:30:1 <Spelling=/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__config:871:39>: parsing namespace 'std'
3.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:30:1 <Spelling=/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__config:872:39>: parsing namespace 'std::__1'
4.	/opt/compiler-explorer/clang-assertions-trunk-20240326/bin/../include/c++/v1/__ranges/movable_box.h:53:1: parsing namespace 'std::ranges'
 #<!-- -->0 0x00000000039246a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x39246a8)
 #<!-- -->1 0x000000000392238c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x392238c)
 #<!-- -->2 0x0000000003868c28 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007f76fd442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007f76fd4969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007f76fd442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007f76fd4287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007f76fd42871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007f76fd439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x0000000006d59d1a (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d59d1a)
#<!-- -->10 0x0000000006d59d7d clang::Sema::SubstTemplateArguments(llvm::ArrayRef&lt;clang::TemplateArgumentLoc&gt;, clang::MultiLevelTemplateArgumentList const&amp;, clang::TemplateArgumentListInfo&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d59d7d)
#<!-- -->11 0x00000000064721e3 substituteParameterMappings(clang::Sema&amp;, clang::NormalizedConstraint&amp;, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&amp;, clang::ASTTemplateArgumentListInfo const*) SemaConcept.cpp:0:0
#<!-- -->12 0x0000000006472120 substituteParameterMappings(clang::Sema&amp;, clang::NormalizedConstraint&amp;, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&amp;, clang::ASTTemplateArgumentListInfo const*) SemaConcept.cpp:0:0
#<!-- -->13 0x00000000064803fd clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64803fd)
#<!-- -->14 0x00000000064802c1 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64802c1)
#<!-- -->15 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#<!-- -->16 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#<!-- -->17 0x000000000648033a clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648033a)
#<!-- -->18 0x00000000064802c1 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64802c1)
#<!-- -->19 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#<!-- -->20 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#<!-- -->21 0x000000000648033a clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648033a)
#<!-- -->22 0x0000000006480823 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6480823)
#<!-- -->23 0x000000000647fb3f clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x647fb3f)
#<!-- -->24 0x0000000006482571 clang::Sema::MaybeEmitAmbiguousAtomicConstraintsDiagnostic(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6482571)
#<!-- -->25 0x0000000006bb31fd void checkTemplatePartialSpecialization&lt;clang::ClassTemplatePartialSpecializationDecl&gt;(clang::Sema&amp;, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#<!-- -->26 0x0000000006c84877 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::Sema::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&amp;, clang::TemplateIdAnnotation&amp;, clang::ParsedAttributesView const&amp;, llvm::MutableArrayRef&lt;clang::TemplateParameterList*&gt;, clang::Sema::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c84877)
#<!-- -->27 0x000000000622b2e0 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-assertions-trunk/bin/clang+++0x622b2e0)
#<!-- -->28 0x00000000062036b5 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-assertions-trunk/bin/clang+++0x62036b5)
#<!-- -->29 0x00000000062c09ea clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&amp;, clang::ParsingDeclRAIIObject&amp;, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62c09ea)
#<!-- -->30 0x00000000062ce312 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#<!-- -->31 0x00000000062ce5d7 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62ce5d7)
#<!-- -->32 0x000000000620a1d0 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a1d0)
#<!-- -->33 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#<!-- -->34 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector&lt;clang::Parser::InnerNamespaceInfo, 4u&gt; const&amp;, unsigned int, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#<!-- -->35 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#<!-- -->36 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#<!-- -->37 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#<!-- -->38 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector&lt;clang::Parser::InnerNamespaceInfo, 4u&gt; const&amp;, unsigned int, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#<!-- -->39 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#<!-- -->40 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#<!-- -->41 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#<!-- -->42 0x0000000006221e64 clang::Parser::ParseInnerNamespace(llvm::SmallVector&lt;clang::Parser::InnerNamespaceInfo, 4u&gt; const&amp;, unsigned int, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6221e64)
#<!-- -->43 0x00000000062242fa clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x62242fa)
#<!-- -->44 0x000000000620a202 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x620a202)
#<!-- -->45 0x00000000061c651e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c651e)
#<!-- -->46 0x00000000061c739d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61c739d)
#<!-- -->47 0x00000000061ba07a clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x61ba07a)
#<!-- -->48 0x00000000041c0aa8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c0aa8)
#<!-- -->49 0x0000000004440169 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4440169)
#<!-- -->50 0x00000000043c985e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43c985e)
#<!-- -->51 0x00000000045231ee clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45231ee)
#<!-- -->52 0x0000000000c296ec cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc296ec)
#<!-- -->53 0x0000000000c2297a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->54 0x0000000004203a19 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
#<!-- -->55 0x00000000038690d4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x38690d4)
#<!-- -->56 0x000000000420400f 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
#<!-- -->57 0x00000000041ca3a5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41ca3a5)
#<!-- -->58 0x00000000041cae0d 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-assertions-trunk/bin/clang+++0x41cae0d)
#<!-- -->59 0x00000000041d2b75 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-assertions-trunk/bin/clang+++0x41d2b75)
#<!-- -->60 0x0000000000c26b85 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc26b85)
#<!-- -->61 0x0000000000b1d084 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb1d084)
#<!-- -->62 0x00007f76fd429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->63 0x00007f76fd429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->64 0x0000000000c2246e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc2246e)

[shafik]

It looks like a recent regression: https://godbolt.org/z/111W1P76M

using -std=c++20 changes the result a little, the parse is not the same.

[zyn0217]

CC @hokein The crash is on the line 7415524#diff-226142fa89b6ed8455a25f4af117171e1ccc98de6c4ba6e3cef12ed3aff3bec8R4790

Backtrace with line numbers

> ../llvm-project-Build/BuildDebug/bin/clang -xc++ -std=c++2c -fsyntax-only -fno-crash-diagnostics /tmp/issue-86757.cpp -DCRASH
/tmp/issue-86757.cpp:4:10: fatal error: 'foobar' file not found
    4 | #include <foobar> // Or some other header that doesn't exist.
      |          ^~~~~~~~
clang: /repo/llvm-project/llvm/include/llvm/ADT/SmallVector.h:322: reference llvm::SmallVectorTemplateCommon<clang::Sema::CodeSynthesisContext>::back() [T = clang::Sema::CodeSynthesisContext]: Assertion `!empty()' 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: ../llvm-project-Build/BuildDebug/bin/clang -xc++ -std=c++2c -fsyntax-only -fno-crash-diagnostics /tmp/issue-86757.cpp -DCRASH
1.      /usr/local/gcc-12/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/ranges:152:7: current parser token '{'
2.      /usr/local/gcc-12/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/ranges:56:1: parsing namespace 'std'
3.      /usr/local/gcc-12/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/ranges:59:1: parsing namespace 'std::ranges'
4.      /usr/local/gcc-12/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/ranges:88:3: parsing namespace 'std::ranges::__detail'
 #0 0x00007f78ce7b9edd llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /repo/llvm-project/llvm/lib/Support/Unix/Signals.inc:723:11
 #1 0x00007f78ce7ba3cb PrintStackTraceSignalHandler(void*) /repo/llvm-project/llvm/lib/Support/Unix/Signals.inc:798:1
 #2 0x00007f78ce7b8436 llvm::sys::RunSignalHandlers() /repo/llvm-project/llvm/lib/Support/Signals.cpp:105:5
 #3 0x00007f78ce7b975e llvm::sys::CleanupOnSignal(unsigned long) /repo/llvm-project/llvm/lib/Support/Unix/Signals.inc:368:1
 #4 0x00007f78ce6a5dc7 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /repo/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:0:7
 #5 0x00007f78ce6a6165 CrashRecoverySignalHandler(int) /repo/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:391:1
 #6 0x00007f78ca47cf60 __restore_rt sigaction.c:0:0
 #7 0x00007f78c991c47a raise /root/glibc-2.33/signal/../sysdeps/unix/sysv/linux/raise.c:50:0
 #8 0x00007f78c991d45e abort /root/glibc-2.33/stdlib/abort.c:81:0
 #9 0x00007f78c991511a __assert_fail_base /root/glibc-2.33/assert/assert.c:89:0
#10 0x00007f78c9915192 (/lib64/libc.so.6+0x33192)
#11 0x00007f78d2b2710c llvm::SmallVectorTemplateCommon<clang::Sema::CodeSynthesisContext, void>::back() /repo/llvm-project/llvm/include/llvm/ADT/SmallVector.h:0:5
#12 0x00007f78d3f5b0ed bool clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformTemplateArguments<clang::TemplateArgumentLoc const*>(clang::TemplateArgumentLoc const*, clang::TemplateArgumentLoc const*, clang::TemplateArgumentListInfo&, bool) /repo/llvm-project/clang/lib/Sema/TreeTransform.h:4790:55
#13 0x00007f78d3f54618 clang::Sema::SubstTemplateArguments(llvm::ArrayRef<clang::TemplateArgumentLoc>, clang::MultiLevelTemplateArgumentList const&, clang::TemplateArgumentListInfo&) /repo/llvm-project/clang/lib/Sema/SemaTemplateInstantiate.cpp:4227:23
#14 0x00007f78d2eaf095 substituteParameterMappings(clang::Sema&, clang::NormalizedConstraint&, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&, clang::ASTTemplateArgumentListInfo const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1276:7
#15 0x00007f78d2eaeca4 substituteParameterMappings(clang::Sema&, clang::NormalizedConstraint&, clang::ConceptDecl*, clang::MultiLevelTemplateArgumentList const&, clang::ASTTemplateArgumentListInfo const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1241:5
#16 0x00007f78d2ea997d substituteParameterMappings(clang::Sema&, clang::NormalizedConstraint&, clang::ConceptSpecializationExpr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1296:10
#17 0x00007f78d2ea9785 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1368:9
#18 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#19 0x00007f78d2ea92be clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1305:8
#20 0x00007f78d2ea9124 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1218:9
#21 0x00007f78d2ea96d0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1359:13
#22 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#23 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#24 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#25 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#26 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#27 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#28 0x00007f78d2ea92be clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1305:8
#29 0x00007f78d2ea9124 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1218:9
#30 0x00007f78d2ea96d0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1359:13
#31 0x00007f78d2ea94c4 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1334:10
#32 0x00007f78d2ea92be clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1305:8
#33 0x00007f78d2ea9124 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1218:9
#34 0x00007f78d2ea96d0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1359:13
#35 0x00007f78d2ea92be clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1305:8
#36 0x00007f78d2ea9124 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1218:9
#37 0x00007f78d2eabbe1 clang::Sema::MaybeEmitAmbiguousAtomicConstraintsDiagnostic(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) /repo/llvm-project/clang/lib/Sema/SemaConcept.cpp:1592:11
#38 0x00007f78d3dd269e void checkMoreSpecializedThanPrimary<clang::ClassTemplatePartialSpecializationDecl>(clang::Sema&, clang::ClassTemplatePartialSpecializationDecl*) /repo/llvm-project/clang/lib/Sema/SemaTemplate.cpp:4867:1
#39 0x00007f78d3be2080 void checkTemplatePartialSpecialization<clang::ClassTemplatePartialSpecializationDecl>(clang::Sema&, clang::ClassTemplatePartialSpecializationDecl*) /repo/llvm-project/clang/lib/Sema/SemaTemplate.cpp:4901:26
#40 0x00007f78d3be204d clang::Sema::CheckTemplatePartialSpecialization(clang::ClassTemplatePartialSpecializationDecl*) /repo/llvm-project/clang/lib/Sema/SemaTemplate.cpp:4920:1
#41 0x00007f78d3bf37a2 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::Sema::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&, clang::TemplateIdAnnotation&, clang::ParsedAttributesView const&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::Sema::SkipBodyInfo*) /repo/llvm-project/clang/lib/Sema/SemaTemplate.cpp:9397:3
#42 0x00007f78d28847e3 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:2156:33
#43 0x00007f78d2856dce clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) /repo/llvm-project/clang/lib/Parse/ParseDecl.cpp:4552:23
#44 0x00007f78d286a452 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*) /repo/llvm-project/clang/include/clang/Parse/Parser.h:2460:5
#45 0x00007f78d295041f clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) /repo/llvm-project/clang/lib/Parse/ParseTemplate.cpp:231:3
#46 0x00007f78d294f848 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) /repo/llvm-project/clang/lib/Parse/ParseTemplate.cpp:174:10
#47 0x00007f78d294f240 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) /repo/llvm-project/clang/lib/Parse/ParseTemplate.cpp:50:10
#48 0x00007f78d284e19e clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /repo/llvm-project/clang/lib/Parse/ParseDecl.cpp:1926:12
#49 0x00007f78d296422e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /repo/llvm-project/clang/lib/Parse/Parser.cpp:988:14
#50 0x00007f78d287ce69 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:271:7
#51 0x00007f78d287c7ed clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:251:18
#52 0x00007f78d284e3ee clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /repo/llvm-project/clang/lib/Parse/ParseDecl.cpp:1945:12
#53 0x00007f78d296422e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /repo/llvm-project/clang/lib/Parse/Parser.cpp:988:14
#54 0x00007f78d287ce69 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:271:7
#55 0x00007f78d287c7ed clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:251:18
#56 0x00007f78d284e3ee clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /repo/llvm-project/clang/lib/Parse/ParseDecl.cpp:1945:12
#57 0x00007f78d296422e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /repo/llvm-project/clang/lib/Parse/Parser.cpp:988:14
#58 0x00007f78d287ce69 clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:271:7
#59 0x00007f78d287c7ed clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /repo/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:251:18
#60 0x00007f78d284e3ee clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /repo/llvm-project/clang/lib/Parse/ParseDecl.cpp:1945:12
#61 0x00007f78d296422e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /repo/llvm-project/clang/lib/Parse/Parser.cpp:988:14
#62 0x00007f78d29625ec clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) /repo/llvm-project/clang/lib/Parse/Parser.cpp:762:12
#63 0x00007f78d283714d clang::ParseAST(clang::Sema&, bool, bool) /repo/llvm-project/clang/lib/Parse/ParseAST.cpp:163:16
#64 0x00007f78cfdcd85b clang::ASTFrontendAction::ExecuteAction() /repo/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1185:1
#65 0x00007f78cfdcd27c clang::FrontendAction::Execute() /repo/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1073:7
#66 0x00007f78cfcf4a6d clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /repo/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:1062:23
#67 0x00007f78cfedf7c1 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /repo/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:274:8
#68 0x00007f78cc07dfbb cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /repo/llvm-project/clang/tools/driver/cc1_main.cpp:232:13
#69 0x00007f78cc0709f2 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) /repo/llvm-project/clang/tools/driver/driver.cpp:215:5
#70 0x00007f78cc07149d clang_main(int, char**, llvm::ToolContext const&)::$_0::operator()(llvm::SmallVectorImpl<char const*>&) const /repo/llvm-project/clang/tools/driver/driver.cpp:355:7
#71 0x00007f78cc07146d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::$_0>(long, llvm::SmallVectorImpl<char const*>&) /repo/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#72 0x00007f78cfa3f741 llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::operator()(llvm::SmallVectorImpl<char const*>&) const /repo/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#73 0x00007f78cfa3c418 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_0::operator()() const /repo/llvm-project/clang/lib/Driver/Job.cpp:440:34
#74 0x00007f78cfa3c3e5 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_0>(long) /repo/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#75 0x00007f78ccd23979 llvm::function_ref<void ()>::operator()() const /repo/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#76 0x00007f78ce6a5bba llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /repo/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:427:3
#77 0x00007f78cfa3bd7b clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const /repo/llvm-project/clang/lib/Driver/Job.cpp:440:7
#78 0x00007f78cf9db3ca clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const /repo/llvm-project/clang/lib/Driver/Compilation.cpp:199:15
#79 0x00007f78cf9db5d7 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const /repo/llvm-project/clang/lib/Driver/Compilation.cpp:253:13
#80 0x00007f78cf9f7a72 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) /repo/llvm-project/clang/lib/Driver/Driver.cpp:1924:7
#81 0x00007f78cc0704cb clang_main(int, char**, llvm::ToolContext const&) /repo/llvm-project/clang/tools/driver/driver.cpp:391:9
#82 0x00007f78cc0a3145 main /repo/llvm-project-Build/BuildDebug/tools/clang/tools/driver/clang-driver.cpp:17:3
#83 0x00007f78c99085e0 __libc_start_main /root/glibc-2.33/csu/../csu/libc-start.c:366:0
#84 0x00007f78cc06f1ea _start /root/glibc-2.33/csu/../sysdeps/x86_64/start.S:122:0