[clang] Assertion failure from member function of variadic class template constrained on class template parameters #162125
Description
The following valid translation unit
template<typename, int size>
concept true_int = (size, true);
template<typename, typename... Ts>
concept true_types = true_int<void, sizeof...(Ts)>;
template<typename... Ts>
struct s {
template<typename T> requires true_types<T, Ts...>
auto f(T) -> void {
}
};
template auto s<void>::f(int) -> void;causes clang to crash with
clang++: /root/llvm-project/llvm/tools/clang/include/clang/Sema/Template.h:156: const clang::TemplateArgument& clang::MultiLevelTemplateArgumentList::operator()(unsigned int, unsigned int) const: Assertion `Index < TemplateArgumentLists[getNumLevels() - Depth - 1].Args.size()' 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++ -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>:14:38: current parser token ';'
#0 0x00000000041ca628 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41ca628)
#1 0x00000000041c7a54 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c7a54)
#2 0x000000000410bce8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000709188842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007091888969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000709188842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007091888287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000070918882871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000709188839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000006bf2bf3 clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseType(clang::QualType, bool) SemaConcept.cpp:0:0
#10 0x0000000006c052fe clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseTemplateTypeParmDecl(clang::TemplateTypeParmDecl*) SemaConcept.cpp:0:0
#11 0x0000000006be9525 clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::dataTraverseNode(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*>>>>*) SemaConcept.cpp:0:0
#12 0x0000000006bf0709 clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*>>>>*) (.constprop.0) SemaConcept.cpp:0:0
#13 0x0000000006bf156b clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseSubstNonTypeTemplateParmExpr(clang::SubstNonTypeTemplateParmExpr*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*>>>>*) SemaConcept.cpp:0:0
#14 0x0000000006be963b clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::dataTraverseNode(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*>>>>*) SemaConcept.cpp:0:0
#15 0x0000000006bf0709 clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl<llvm::PointerIntPair<clang::Stmt*, 1u, bool, llvm::PointerLikeTypeTraits<clang::Stmt*>, llvm::PointerIntPairInfo<clang::Stmt*, 1u, llvm::PointerLikeTypeTraits<clang::Stmt*>>>>*) (.constprop.0) SemaConcept.cpp:0:0
#16 0x0000000006bf30b1 clang::RecursiveASTVisitor<(anonymous namespace)::HashParameterMapping>::TraverseTemplateArgument(clang::TemplateArgument const&) SemaConcept.cpp:0:0
#17 0x0000000006bf3387 (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::AtomicConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#18 0x0000000006bf6f18 (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::ConceptIdConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#19 0x0000000006bf6f18 (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::ConceptIdConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#20 0x0000000006bf9615 CheckConstraintSatisfaction(clang::Sema&, clang::NamedDecl const*, llvm::ArrayRef<clang::AssociatedConstraint>, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&, clang::Expr**, clang::ConceptReference const*) SemaConcept.cpp:0:0
#21 0x0000000006bf9dad clang::Sema::CheckConstraintSatisfaction(llvm::PointerUnion<clang::NamedDecl const*, clang::concepts::NestedRequirement const*>, llvm::ArrayRef<clang::AssociatedConstraint>, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&, clang::ConceptReference const*, clang::Expr**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bf9dad)
#22 0x0000000006bfaeea clang::Sema::CheckFunctionTemplateConstraints(clang::SourceLocation, clang::FunctionDecl*, llvm::ArrayRef<clang::TemplateArgument>, clang::ConstraintSatisfaction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6bfaeea)
#23 0x0000000007373598 clang::Sema::FinishTemplateArgumentDeduction(clang::FunctionTemplateDecl*, llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, llvm::SmallVectorImpl<clang::Sema::OriginalCallArg> const*, bool, bool, bool, llvm::function_ref<bool (bool)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7373598)
#24 0x0000000007374a6c void llvm::function_ref<void ()>::callback_fn<clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, clang::QualType, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool)::'lambda0'()>(long) SemaTemplateDeduction.cpp:0:0
#25 0x000000000817f1f1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x817f1f1)
#26 0x0000000007335a8c clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, clang::QualType, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7335a8c)
#27 0x00000000072c4102 clang::Sema::ActOnExplicitInstantiation(clang::Scope*, clang::SourceLocation, clang::SourceLocation, clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72c4102)
#28 0x00000000068e259d clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68e259d)
#29 0x00000000068efc29 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+++0x68efc29)
#30 0x00000000069bf9b8 clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69bf9b8)
#31 0x00000000069c050c clang::Parser::ParseExplicitInstantiation(clang::DeclaratorContext, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69c050c)
#32 0x00000000069cd078 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69cd078)
#33 0x00000000068f8f30 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68f8f30)
#34 0x00000000068b5627 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68b5627)
#35 0x00000000068b64f5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68b64f5)
#36 0x0000000006897b5a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6897b5a)
#37 0x0000000004b08ee8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b08ee8)
#38 0x0000000004df44e5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4df44e5)
#39 0x0000000004d754be clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d754be)
#40 0x0000000004eeb75d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4eeb75d)
#41 0x0000000000dbbd40 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdbbd40)
#42 0x0000000000db28aa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#43 0x0000000000db2a2d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#44 0x0000000004b72069 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
#45 0x000000000410c184 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x410c184)
#46 0x0000000004b7267f 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
#47 0x0000000004b339b2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b339b2)
#48 0x0000000004b3495e 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+++0x4b3495e)
#49 0x0000000004b3c095 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b3c095)
#50 0x0000000000db8269 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb8269)
#51 0x0000000000c69a74 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc69a74)
#52 0x0000709188829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#53 0x0000709188829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#54 0x0000000000db2345 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb2345)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134See it live: https://godbolt.org/z/Kj9cd3xPE