Assertion `TA.getKind() != TemplateArgument::Pack || TA.pack_size() == 1' failed #115098
Description
The following translation unit:
struct a {
};
template<typename>
struct b {
};
template<typename... Ts>
struct c {
template<typename T> requires(void(sizeof...(Ts)), false)
friend bool operator==(c, b<T>);
};
template<typename... Ts>
struct d {
template<typename T> requires(void(sizeof...(Ts)), false)
friend bool operator==(d, b<T>);
};
void f() {
auto x = c<a>();
auto y = d<a, a>();
}causes clang to crash with
clang++: /root/llvm-project/clang/lib/Sema/SemaTemplateInstantiate.cpp:1748: clang::ExprResult {anonymous}::TemplateInstantiator::RebuildSizeOfPackExpr(clang::SourceLocation, clang::NamedDecl*, clang::SourceLocation, clang::SourceLocation, std::optional<unsigned int>, llvm::ArrayRef<clang::TemplateArgument>): Assertion `TA.getKind() != TemplateArgument::Pack || TA.pack_size() == 1' 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 -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1. <source>:22:20: current parser token ';'
2. <source>:20:10: parsing function body 'f'
3. <source>:20:10: in compound statement ('{}')
4. <source>:15:8: instantiating class definition 'd<a, a>'
#0 0x0000000003be9e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be9e28)
#1 0x0000000003be7b2c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be7b2c)
#2 0x0000000003b35468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000730f96042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000730f960969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000730f96042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000730f960287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000730f9602871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000730f96039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000740eeeb (anonymous namespace)::TemplateInstantiator::RebuildSizeOfPackExpr(clang::SourceLocation, clang::NamedDecl*, clang::SourceLocation, clang::SourceLocation, std::optional<unsigned int>, llvm::ArrayRef<clang::TemplateArgument>) SemaTemplateInstantiate.cpp:0:0
#10 0x000000000748543d clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformSizeOfPackExpr(clang::SizeOfPackExpr*) SemaTemplateInstantiate.cpp:0:0
#11 0x000000000746547e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#12 0x000000000748ba08 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCXXFunctionalCastExpr(clang::CXXFunctionalCastExpr*) SemaTemplateInstantiate.cpp:0:0
#13 0x0000000007464ea8 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#14 0x00000000074744c0 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformBinaryOperator(clang::BinaryOperator*) SemaTemplateInstantiate.cpp:0:0
#15 0x0000000007464bf0 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#16 0x000000000746f748 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformParenExpr(clang::ParenExpr*) SemaTemplateInstantiate.cpp:0:0
#17 0x000000000746521a clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#18 0x000000000747539f clang::Sema::SubstConstraintExprWithoutSatisfaction(clang::Expr*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x747539f)
#19 0x00000000069cf78b SubstituteConstraintExpressionWithoutSatisfaction(clang::Sema&, clang::Sema::TemplateCompareNewDeclInfo const&, clang::Expr const*) SemaConcept.cpp:0:0
#20 0x00000000069db610 clang::Sema::AreConstraintExpressionsEqual(clang::NamedDecl const*, clang::Expr const*, clang::Sema::TemplateCompareNewDeclInfo const&, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69db610)
#21 0x000000000725dce0 clang::Sema::TemplateParameterListsAreEqual(clang::Sema::TemplateCompareNewDeclInfo const&, clang::TemplateParameterList*, clang::NamedDecl const*, clang::TemplateParameterList*, bool, clang::Sema::TemplateParameterListEqualKind, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x725dce0)
#22 0x00000000071610be IsOverloadOrOverrideImpl(clang::Sema&, clang::FunctionDecl*, clang::FunctionDecl*, bool, bool, bool) SemaOverload.cpp:0:0
#23 0x0000000007161b11 clang::Sema::CheckOverload(clang::Scope*, clang::FunctionDecl*, clang::LookupResult const&, clang::NamedDecl*&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7161b11)
#24 0x0000000006ab3b90 clang::Sema::CheckFunctionDeclaration(clang::Scope*, clang::FunctionDecl*, clang::LookupResult&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ab3b90)
#25 0x000000000751a862 clang::TemplateDeclInstantiator::VisitFunctionDecl(clang::FunctionDecl*, clang::TemplateParameterList*, clang::TemplateDeclInstantiator::RewriteKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x751a862)
#26 0x0000000007520c6d clang::TemplateDeclInstantiator::VisitFunctionTemplateDecl(clang::FunctionTemplateDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7520c6d)
#27 0x000000000751dede clang::TemplateDeclInstantiator::VisitFriendDecl(clang::FriendDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x751dede)
#28 0x0000000007489c1b clang::Sema::InstantiateClass(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7489c1b)
#29 0x000000000748b90e clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x748b90e)
#30 0x000000000754d9af void llvm::function_ref<void ()>::callback_fn<clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*)::'lambda'()>(long) SemaType.cpp:0:0
#31 0x00000000081c2751 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x81c2751)
#32 0x0000000007556e57 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7556e57)
#33 0x00000000075571a5 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x75571a5)
#34 0x0000000006dd563b clang::Sema::BuildCXXTypeConstructExpr(clang::TypeSourceInfo*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6dd563b)
#35 0x0000000006e7bf8d clang::Sema::ActOnCXXTypeConstructExpr(clang::OpaquePtr<clang::QualType>, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e7bf8d)
#36 0x000000000677d0c5 clang::Parser::ParseCXXTypeConstructExpression(clang::DeclSpec const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x677d0c5)
#37 0x000000000676038a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x676038a)
#38 0x000000000675efce clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x675efce)
#39 0x0000000006760eb7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6760eb7)
#40 0x0000000006760f49 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6760f49)
#41 0x000000000671a878 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671a878)
#42 0x00000000067298d9 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67298d9)
#43 0x00000000067321f7 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67321f7)
#44 0x00000000067326b9 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67326b9)
#45 0x00000000067de8d2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67de8d2)
#46 0x00000000067df600 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67df600)
#47 0x00000000067e04c4 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e04c4)
#48 0x00000000067e1c7a clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e1c7a)
#49 0x00000000066f5bb3 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f5bb3)
#50 0x000000000672a2bd clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672a2bd)
#51 0x00000000066e98fe clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e98fe)
#52 0x00000000066ea0be clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ea0be)
#53 0x00000000066f1853 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f1853)
#54 0x00000000066f273d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f273d)
#55 0x00000000066e4c5a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e4c5a)
#56 0x0000000004563b58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4563b58)
#57 0x000000000481e689 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x481e689)
#58 0x000000000479d8fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x479d8fe)
#59 0x000000000490441e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x490441e)
#60 0x0000000000ce624f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce624f)
#61 0x0000000000cddf0a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#62 0x00000000045a6cb9 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
#63 0x0000000003b35914 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b35914)
#64 0x00000000045a72af 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
#65 0x000000000456d63d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d63d)
#66 0x000000000456e72d 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+++0x456e72d)
#67 0x0000000004575ae5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4575ae5)
#68 0x0000000000ce30e9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce30e9)
#69 0x0000000000bb0284 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb0284)
#70 0x0000730f96029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#71 0x0000730f96029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#72 0x0000000000cdd9be _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdd9be)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134See it live: https://godbolt.org/z/Ybnxx96bq
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