Assertion when passing a lambda to an immediate function

[TommyXR]

I encountered a crash on the latest version (clang-trunk x86-64) available in compiler-explorer.

https://godbolt.org/z/4ozGTasoT

The crash doesn't happen on the 14.0.0 version of the compiler.

Here is the stacktrace (everything is in the 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 -O3 -std=c++20 <source> -isystem/opt/compiler-explorer/libs/fmt/trunk/include
1.	<source>:59:46: current parser token ')'
2.	<source>:58:12: parsing function body 'main'
3.	<source>:58:12: in compound statement ('{}')
4.	<source>:49:23: instantiating function definition 'create_error<const char (&)[8]>'
 #0 0x000055f0f8cfc9af PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x000055f0f8cfa7a4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x36fa7a4)
 #2 0x000055f0f8c3c428 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f0d202983c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x143c0)
 #4 0x000055f0fb916a88 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::RecordExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
 #5 0x000055f0fb918280 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::RecordExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
 #6 0x000055f0fb8f1b8c EvaluateInPlace(clang::APValue&, (anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&, clang::Expr const*, bool) ExprConstant.cpp:0:0
 #7 0x000055f0fb8f978c clang::Expr::EvaluateAsConstantExpr(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::ConstantExprKind) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62f978c)
 #8 0x000055f0fb0500f9 clang::Sema::PopExpressionEvaluationContext() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5a500f9)
 #9 0x000055f0fb49a76f clang::Sema::InstantiateVariableInitializer(clang::VarDecl*, clang::VarDecl*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e9a76f)
#10 0x000055f0fb4ca478 clang::Sema::BuildVariableInstantiation(clang::VarDecl*, clang::VarDecl*, clang::MultiLevelTemplateArgumentList const&, llvm::SmallVector<clang::Sema::LateInstantiatedAttribute, 16u>*, clang::DeclContext*, clang::LocalInstantiationScope*, bool, clang::VarTemplateSpecializationDecl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5eca478)
#11 0x000055f0fb4d2695 clang::TemplateDeclInstantiator::VisitVarDecl(clang::VarDecl*, bool, llvm::ArrayRef<clang::BindingDecl*>*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5ed2695)
#12 0x000055f0fb4d6db4 void llvm::function_ref<void ()>::callback_fn<clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&)::'lambda'()>(long) SemaTemplateInstantiateDecl.cpp:0:0
#13 0x000055f0fad82aaf clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5782aaf)
#14 0x000055f0fb499263 clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e99263)
#15 0x000055f0fb4626cc clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformDeclStmt(clang::DeclStmt*) SemaTemplateInstantiate.cpp:0:0
#16 0x000055f0fb490491 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#17 0x000055f0fb494dba clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5e94dba)
#18 0x000055f0fb4cce58 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5ecce58)
#19 0x000055f0fb049eae void llvm::function_ref<void ()>::callback_fn<clang::Sema::MarkFunctionReferenced(clang::SourceLocation, clang::FunctionDecl*, bool)::'lambda'()>(long) SemaExpr.cpp:0:0
#20 0x000055f0fad82aaf clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5782aaf)
#21 0x000055f0fb00ee6b clang::Sema::MarkFunctionReferenced(clang::SourceLocation, clang::FunctionDecl*, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5a0ee6b)
#22 0x000055f0fb041dd9 MarkExprReferenced(clang::Sema&, clang::SourceLocation, clang::Decl*, clang::Expr*, bool, llvm::DenseMap<clang::VarDecl const*, int, llvm::DenseMapInfo<clang::VarDecl const*, void>, llvm::detail::DenseMapPair<clang::VarDecl const*, int>>&) SemaExpr.cpp:0:0
#23 0x000055f0fb043224 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+++0x5a43224)
#24 0x000055f0fb2e1b86 clang::Sema::FixOverloadedFunctionReference(clang::Expr*, clang::DeclAccessPair, clang::FunctionDecl*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5ce1b86)
#25 0x000055f0fb309e0c FinishOverloadedCallExpr(clang::Sema&, clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, clang::OverloadCandidateSet*, clang::OverloadCandidate**, clang::OverloadingResult, bool) SemaOverload.cpp:0:0
#26 0x000055f0fb30a4c2 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5d0a4c2)
#27 0x000055f0fb06b3aa clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5a6b3aa)
#28 0x000055f0fb06fd33 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5a6fd33)
#29 0x000055f0facc224d clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56c224d)
#30 0x000055f0facbbe57 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56bbe57)
#31 0x000055f0facbe896 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56be896)
#32 0x000055f0facbf85e clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56bf85e)
#33 0x000055f0facc10f9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56c10f9)
#34 0x000055f0fad2bafd clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x572bafd)
#35 0x000055f0fad211b2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x57211b2)
#36 0x000055f0fad21c05 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5721c05)
#37 0x000055f0fad2263f clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x572263f)
#38 0x000055f0fad235a3 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x57235a3)
#39 0x000055f0fac6fbaa clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x566fbaa)
#40 0x000055f0fac9b17a clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x569b17a)
#41 0x000055f0fac6a4b2 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x566a4b2)
#42 0x000055f0fac6b0c1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.289) Parser.cpp:0:0
#43 0x000055f0fac717ac clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56717ac)
#44 0x000055f0fac728bb clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56728bb)
#45 0x000055f0fac6594b clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x566594b)
#46 0x000055f0f9d19d4d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4719d4d)
#47 0x000055f0f96f24e1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x40f24e1)
#48 0x000055f0f968aac2 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x408aac2)
#49 0x000055f0f97c0f83 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x41c0f83)
#50 0x000055f0f6844df4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x1244df4)
#51 0x000055f0f683db3d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#52 0x000055f0f951b905 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#53 0x000055f0f8c3ca13 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x363ca13)
#54 0x000055f0f951d9d8 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3f1d9d8)
#55 0x000055f0f94ebdc3 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3eebdc3)
#56 0x000055f0f94ec903 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+++0x3eec903)
#57 0x000055f0f94f587f clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3ef587f)
#58 0x000055f0f68429ee clang_main(int, char**) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x12429ee)
#59 0x00007f0d1fd460b3 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x240b3)
#60 0x000055f0f683d74a _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0x123d74a)
clang-15: error: clang frontend command failed with exit code 139 (use -v to see invocation)
ASM generation compiler returned: 139
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-20220623/bin/clang-15 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name example.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debug-info-kind=constructor -dwarf-version=4 -debugger-tuning=gdb -fcoverage-compilation-dir=/app -resource-dir /opt/compiler-explorer/clang-trunk-20220623/lib/clang/15.0.0 -isystem /opt/compiler-explorer/libs/fmt/trunk/include -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/13.0.0/../../../../include/c++/13.0.0 -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/13.0.0/../../../../include/c++/13.0.0/x86_64-linux-gnu -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/13.0.0/../../../../include/c++/13.0.0/backward -internal-isystem /opt/compiler-explorer/clang-trunk-20220623/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/13.0.0/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -std=c++20 -fdeprecated-macro -fdebug-compilation-dir=/app -ferror-limit 19 -fgnuc-version=4.2.1 -fno-implicit-modules -fcxx-exceptions -fexceptions -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/example-fc406a.o -x c++ <source>
1.	<source>:59:46: current parser token ')'
2.	<source>:58:12: parsing function body 'main'
3.	<source>:58:12: in compound statement ('{}')
4.	<source>:49:23: instantiating function definition 'create_error<const char (&)[8]>'
 #0 0x00005609606fc9af PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x00005609606fa24c SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f511ae1c3c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x143c0)
 #3 0x0000560963316a88 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::RecordExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
 #4 0x0000560963318280 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::RecordExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
 #5 0x00005609632f1b8c EvaluateInPlace(clang::APValue&, (anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&, clang::Expr const*, bool) ExprConstant.cpp:0:0
 #6 0x00005609632f978c clang::Expr::EvaluateAsConstantExpr(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::ConstantExprKind) const (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x62f978c)
 #7 0x0000560962a500f9 clang::Sema::PopExpressionEvaluationContext() (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5a500f9)
 #8 0x0000560962e9a76f clang::Sema::InstantiateVariableInitializer(clang::VarDecl*, clang::VarDecl*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5e9a76f)
 #9 0x0000560962eca478 clang::Sema::BuildVariableInstantiation(clang::VarDecl*, clang::VarDecl*, clang::MultiLevelTemplateArgumentList const&, llvm::SmallVector<clang::Sema::LateInstantiatedAttribute, 16u>*, clang::DeclContext*, clang::LocalInstantiationScope*, bool, clang::VarTemplateSpecializationDecl*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5eca478)
#10 0x0000560962ed2695 clang::TemplateDeclInstantiator::VisitVarDecl(clang::VarDecl*, bool, llvm::ArrayRef<clang::BindingDecl*>*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5ed2695)
#11 0x0000560962ed6db4 void llvm::function_ref<void ()>::callback_fn<clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&)::'lambda'()>(long) SemaTemplateInstantiateDecl.cpp:0:0
#12 0x0000560962782aaf clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5782aaf)
#13 0x0000560962e99263 clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5e99263)
#14 0x0000560962e626cc clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformDeclStmt(clang::DeclStmt*) SemaTemplateInstantiate.cpp:0:0
#15 0x0000560962e90491 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#16 0x0000560962e94dba clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5e94dba)
#17 0x0000560962ecce58 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5ecce58)
#18 0x0000560962a49eae void llvm::function_ref<void ()>::callback_fn<clang::Sema::MarkFunctionReferenced(clang::SourceLocation, clang::FunctionDecl*, bool)::'lambda'()>(long) SemaExpr.cpp:0:0
#19 0x0000560962782aaf clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5782aaf)
#20 0x0000560962a0ee6b clang::Sema::MarkFunctionReferenced(clang::SourceLocation, clang::FunctionDecl*, bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5a0ee6b)
#21 0x0000560962a41dd9 MarkExprReferenced(clang::Sema&, clang::SourceLocation, clang::Decl*, clang::Expr*, bool, llvm::DenseMap<clang::VarDecl const*, int, llvm::DenseMapInfo<clang::VarDecl const*, void>, llvm::detail::DenseMapPair<clang::VarDecl const*, int>>&) SemaExpr.cpp:0:0
#22 0x0000560962a43224 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-20220623/bin/clang-15+0x5a43224)
#23 0x0000560962ce1b86 clang::Sema::FixOverloadedFunctionReference(clang::Expr*, clang::DeclAccessPair, clang::FunctionDecl*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5ce1b86)
#24 0x0000560962d09e0c FinishOverloadedCallExpr(clang::Sema&, clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, clang::OverloadCandidateSet*, clang::OverloadCandidate**, clang::OverloadingResult, bool) SemaOverload.cpp:0:0
#25 0x0000560962d0a4c2 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5d0a4c2)
#26 0x0000560962a6b3aa clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5a6b3aa)
#27 0x0000560962a6fd33 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5a6fd33)
#28 0x00005609626c224d clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56c224d)
#29 0x00005609626bbe57 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56bbe57)
#30 0x00005609626be896 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56be896)
#31 0x00005609626bf85e clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56bf85e)
#32 0x00005609626c10f9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56c10f9)
#33 0x000056096272bafd clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x572bafd)
#34 0x00005609627211b2 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x57211b2)
#35 0x0000560962721c05 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x5721c05)
#36 0x000056096272263f clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x572263f)
#37 0x00005609627235a3 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x57235a3)
#38 0x000056096266fbaa clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x566fbaa)
#39 0x000056096269b17a clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x569b17a)
#40 0x000056096266a4b2 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x566a4b2)
#41 0x000056096266b0c1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.289) Parser.cpp:0:0
#42 0x00005609626717ac clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56717ac)
#43 0x00005609626728bb clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x56728bb)
#44 0x000056096266594b clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x566594b)
#45 0x0000560961719d4d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x4719d4d)
#46 0x00005609610f24e1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x40f24e1)
#47 0x000056096108aac2 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x408aac2)
#48 0x00005609611c0f83 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x41c0f83)
#49 0x000056095e244df4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x1244df4)
#50 0x000056095e23db3d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#51 0x000056095e24038d clang_main(int, char**) (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x124038d)
#52 0x00007f511a8ca0b3 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x240b3)
#53 0x000056095e23d74a _start (/opt/compiler-explorer/clang-trunk-20220623/bin/clang-15+0x123d74a)
clang-15: error: unable to execute command: Segmentation fault (core dumped)
clang-15: error: clang frontend command failed due to signal (use -v to see invocation)
Execution build compiler returned: 254

Thank you!

[llvmbot]

@llvm/issue-subscribers-clang-frontend

[www807]

consteval void Foo(char) {}
consteval char Bar(auto) { return {}; }
int main() {
    Foo(Bar([] { }));
}

https://godbolt.org/z/3e6ersvGn
minimised example
Bar needs to be passed a lambda it seems
Both functions need to be consteval and not just evaluated during compile time and constexpr
Happens on both -O0 and -O3, works in clang 10.0.1 but not on 11.0.0
Foo taking a char is arbitrary, it is the nesting of Foo, Bar and the lambda that seems important
If the lambda is given a name and passed in as a parameter is compiles normally

[llvmbot]

@llvm/issue-subscribers-c-20

[AaronBallman]

I've confirmed the issue. Something odd is going on -- the root cause seems to be that we fail to template instantiate the call to Bar() because we think the argument type passed is not compatible with the parameter type. The argument is a lambda, but before we call Sema::RequireCompleteType() from Sema::GatherArgumentsForCall(), the parameter is already resolved to be a lambda as well. The two lambda types do not match, and thus Sema::PerformCopyInitialization() fails when setting up the initialization sequence when we get to https://github.com/llvm/llvm-project/blob/main/clang/lib/Sema/SemaInit.cpp#L5952 (we end up trying the user-defined conversion and fail). I haven't had the chance to dig too much deeper into what's going on though.