[clang] Assertion failure in variadic concept using variadic concept using concept #161987
Description
The following valid translation unit
template<int size>
concept true1 = size == size;
template<typename... Ts>
concept true2 = true1<sizeof...(Ts)>;
template<typename... Ts>
concept true3 = true2<Ts...>;
static_assert(true3<void>);causes clang to crash with
clang++: /root/llvm-project/llvm/include/llvm/Support/Casting.h:573: decltype(auto) llvm::cast(From*) [with To = clang::NonTypeTemplateParmDecl; From = clang::NamedDecl]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' 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>:10:26: current parser token ')'
#0 0x00000000041c9088 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c9088)
#1 0x00000000041c64b4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c64b4)
#2 0x000000000410a748 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000761d3ea42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000761d3ea969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000761d3ea42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000761d3ea287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000761d3ea2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000761d3ea39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000073f9949 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformSubstNonTypeTemplateParmExpr(clang::SubstNonTypeTemplateParmExpr*) SemaTemplateInstantiate.cpp:0:0
#10 0x00000000073dd9e7 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#11 0x00000000073f3f9b clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformTemplateArgument(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, bool) SemaTemplateInstantiate.cpp:0:0
#12 0x00000000073f4788 (anonymous namespace)::TemplateInstantiator::TransformTemplateArgument(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, bool) SemaTemplateInstantiate.cpp:0:0
#13 0x00000000073f5b38 bool clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformTemplateArguments<clang::TemplateArgumentLoc const*>(clang::TemplateArgumentLoc const*, clang::TemplateArgumentLoc const*, clang::TemplateArgumentListInfo&, bool) (.constprop.0) SemaTemplateInstantiate.cpp:0:0
#14 0x00000000073f61ec clang::Sema::SubstTemplateArgumentsInParameterMapping(llvm::ArrayRef<clang::TemplateArgumentLoc>, clang::SourceLocation, clang::MultiLevelTemplateArgumentList const&, clang::TemplateArgumentListInfo&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x73f61ec)
#15 0x0000000006b8cff3 (anonymous namespace)::ConstraintSatisfactionChecker::SubstitutionInTemplateArguments(clang::NormalizedConstraintWithParamMapping const&, clang::MultiLevelTemplateArgumentList, llvm::SmallVector<clang::TemplateArgument, 2u>&) SemaConcept.cpp:0:0
#16 0x0000000006bf36b7 (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::AtomicConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#17 0x0000000006bf6e7e (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::ConceptIdConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#18 0x0000000006bf6e7e (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::ConceptIdConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#19 0x0000000006bf6e7e (anonymous namespace)::ConstraintSatisfactionChecker::Evaluate(clang::ConceptIdConstraint const&, clang::MultiLevelTemplateArgumentList const&) SemaConcept.cpp:0:0
#20 0x0000000006bf9515 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 0x0000000006bf9cad 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+++0x6bf9cad)
#22 0x00000000072b6549 clang::Sema::CheckConceptTemplateId(clang::CXXScopeSpec const&, clang::SourceLocation, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::TemplateDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72b6549)
#23 0x00000000072bdcad clang::Sema::BuildTemplateIdExpr(clang::CXXScopeSpec const&, clang::SourceLocation, clang::LookupResult&, bool, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72bdcad)
#24 0x0000000006e01db8 clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e01db8)
#25 0x0000000006943b86 clang::Parser::tryParseCXXIdExpression(clang::CXXScopeSpec&, bool, clang::Token&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6943b86)
#26 0x0000000006943e50 clang::Parser::ParseCXXIdExpression(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6943e50)
#27 0x0000000006927b3a clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6927b3a)
#28 0x00000000069272ce clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69272ce)
#29 0x00000000069341fe clang::Parser::ParseConstantExpressionInExprEvalContext(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69341fe)
#30 0x000000000690af36 clang::Parser::ParseStaticAssertDeclaration(clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x690af36)
#31 0x00000000068f88c6 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68f88c6)
#32 0x00000000068b5037 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68b5037)
#33 0x00000000068b5f05 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68b5f05)
#34 0x000000000689756a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x689756a)
#35 0x0000000004b07558 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b07558)
#36 0x0000000004df2b65 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4df2b65)
#37 0x0000000004d73b3e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d73b3e)
#38 0x0000000004ee9ddd clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ee9ddd)
#39 0x0000000000dbba10 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdbba10)
#40 0x0000000000db257a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#41 0x0000000000db26fd 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
#42 0x0000000004b706d9 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
#43 0x000000000410abe4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x410abe4)
#44 0x0000000004b70cef 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
#45 0x0000000004b32022 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b32022)
#46 0x0000000004b32fce 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+++0x4b32fce)
#47 0x0000000004b3a705 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b3a705)
#48 0x0000000000db7f39 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb7f39)
#49 0x0000000000c69934 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc69934)
#50 0x0000761d3ea29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#51 0x0000761d3ea29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#52 0x0000000000db2015 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb2015)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134Introduced by 9583b39 @cor3ntin @zyn0217
See it live: https://godbolt.org/z/a4bh694bc