Skip to content

[Clang][Regression:20] Crash on constraint for lambda in lambda with init-capture #133719

New issue
New issue
Closed
Bug
#133863
Closed
[Clang][Regression:20] Crash on constraint for lambda in lambda with init-capture#133719
Bug
#133863
Assignees
zyn0217
Labels
clang:frontendLanguage frontend issues, e.g. anything involving "Sema"confirmedVerified by a second partyconstexprAnything related to constant evaluationcrashPrefer [crash-on-valid] or [crash-on-invalid]lambdaC++11 lambda expressionsregression:20Regression in 20 release
@MagentaTreehouse

Description

@MagentaTreehouse
MagentaTreehouse
opened on Mar 31, 2025
Contributor

The following C++20 code causes a crash since Clang 20:

template <class T>
constexpr auto f{[] (auto arg) {
    return [a{arg}] {
        [] () requires true {}();
    };
}};

int main() {
    f<int>(0);
}

See https://compiler-explorer.com/z/Gh6soKaEE.

See also #128175.

Assertion:

clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:733:
bool clang::Sema::addInstantiatedCapturesToScope(clang::FunctionDecl*, const clang::FunctionDecl*, clang::LocalInstantiationScope&, const clang::MultiLevelTemplateArgumentList&):
Assertion `InstantiatingScope' failed.
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>:9:13: current parser token ')'
2.	<source>:8:12: parsing function body 'main'
3.	<source>:8:12: in compound statement ('{}')
4.	<source>:2:18: instantiating function definition '(anonymous class)::operator()<int>'
 #0 0x0000000003ea56b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ea56b8)
 #1 0x0000000003ea3344 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ea3344)
 #2 0x0000000003de8488 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007a01e8642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007a01e86969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007a01e8642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007a01e86287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007a01e862871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007a01e8639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000067ad2ee clang::Sema::addInstantiatedCapturesToScope(clang::FunctionDecl*, clang::FunctionDecl const*, clang::LocalInstantiationScope&, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67ad2ee)
#10 0x0000000006be427f clang::Sema::LambdaScopeForCallOperatorInstantiationRAII::LambdaScopeForCallOperatorInstantiationRAII(clang::Sema&, clang::FunctionDecl*, clang::MultiLevelTemplateArgumentList, clang::LocalInstantiationScope&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6be427f)
#11 0x00000000067ba8bf clang::Sema::CheckFunctionConstraints(clang::FunctionDecl const*, clang::ConstraintSatisfaction&, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67ba8bf)
#12 0x0000000006df3895 clang::Sema::AddMethodCandidate(clang::CXXMethodDecl*, clang::DeclAccessPair, clang::CXXRecordDecl*, clang::QualType, clang::Expr::Classification, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool, llvm::MutableArrayRef<clang::ImplicitConversionSequence>, clang::OverloadCandidateParamOrder, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6df3895)
#13 0x0000000006dfbea2 clang::Sema::AddMethodCandidate(clang::DeclAccessPair, clang::QualType, clang::Expr::Classification, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, clang::OverloadCandidateParamOrder) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6dfbea2)
#14 0x0000000006e13022 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e13022)
#15 0x0000000006a1c643 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1c643)
#16 0x0000000006a1cf2c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1cf2c)
#17 0x0000000007088c48 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#18 0x0000000007077642 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#19 0x00000000070a5d87 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformStmt(clang::Stmt*, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#20 0x00000000070a699e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#21 0x00000000070769d4 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformLambdaExpr(clang::LambdaExpr*) SemaTemplateInstantiate.cpp:0:0
#22 0x0000000007077d2e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#23 0x000000000707a865 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformInitializer(clang::Expr*, bool) (.part.0) SemaTemplateInstantiate.cpp:0:0
#24 0x000000000707ac0c clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformReturnStmt(clang::ReturnStmt*) SemaTemplateInstantiate.cpp:0:0
#25 0x00000000070a699e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#26 0x00000000070af9d4 clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70af9d4)
#27 0x000000000712b29d clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x712b29d)
#28 0x0000000007db96d1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7db96d1)
#29 0x0000000006f8924a clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f8924a)
#30 0x00000000069d43c6 clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef<clang::SourceLocation>, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69d43c6)
#31 0x0000000006dd1ef7 CreateFunctionRefExpr(clang::Sema&, clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool, clang::SourceLocation, clang::DeclarationNameLoc const&) SemaOverload.cpp:0:0
#32 0x0000000006e139aa clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e139aa)
#33 0x0000000006a1c643 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1c643)
#34 0x0000000006a1cf2c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1cf2c)
#35 0x00000000065581f2 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65581f2)
#36 0x0000000006550b71 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6550b71)
#37 0x0000000006552cd7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6552cd7)
#38 0x0000000006552d69 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6552d69)
#39 0x0000000006557739 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6557739)
#40 0x00000000065db339 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65db339)
#41 0x00000000065d3052 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65d3052)
#42 0x00000000065d3f7d clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 24u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65d3f7d)
#43 0x00000000065dba33 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65dba33)
#44 0x00000000065dc1fa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65dc1fa)
#45 0x00000000064e5c93 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e5c93)
#46 0x000000000651b22d 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+++0x651b22d)
#47 0x00000000064d98ae clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d98ae)
#48 0x00000000064da069 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64da069)
#49 0x00000000064e1933 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e1933)
#50 0x00000000064e284d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e284d)
#51 0x00000000064d4d9a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d4d9a)
#52 0x000000000483cac8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x483cac8)
#53 0x0000000004b2b555 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b2b555)
#54 0x0000000004aad19e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4aad19e)
#55 0x0000000004c1bb1e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c1bb1e)
#56 0x0000000000d5dc0f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd5dc0f)
#57 0x0000000000d553ca ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#58 0x00000000048a2469 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
#59 0x0000000003de8924 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3de8924)
#60 0x00000000048a2a7f 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
#61 0x000000000486543d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x486543d)
#62 0x00000000048664ce 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+++0x48664ce)
#63 0x000000000486dbd5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x486dbd5)
#64 0x0000000000d5aa08 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd5aa08)
#65 0x0000000000c20d34 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc20d34)
#66 0x00007a01e8629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#67 0x00007a01e8629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#68 0x0000000000d54e75 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd54e75)

Activity

llvmbot
added
clangClang issues not falling into any other category
on Mar 31, 2025
EugeneZelenko
added
clang:frontendLanguage frontend issues, e.g. anything involving "Sema"
crashPrefer [crash-on-valid] or [crash-on-invalid]
lambdaC++11 lambda expressions
constexprAnything related to constant evaluation
and removed
clangClang issues not falling into any other category
on Mar 31, 2025
EugeneZelenko
added the
Bug
issue type on Mar 31, 2025
llvmbot

llvmbot commented on Mar 31, 2025

@llvmbot
llvmbot
on Mar 31, 2025
Member

@llvm/issue-subscribers-clang-frontend

Author: None (MagentaTreehouse)

The following C++20 code causes a crash since Clang 20: 
template &lt;class T&gt;
constexpr auto f{[] (auto arg) {
    return [a{arg}] {
        [] () requires true {}();
    };
}};

int main() {
    f&lt;int&gt;(0);
}

See https://compiler-explorer.com/z/Gh6soKaEE.

See also #128175.

Assertion:

clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:733:
bool clang::Sema::addInstantiatedCapturesToScope(clang::FunctionDecl*, const clang::FunctionDecl*, clang::LocalInstantiationScope&amp;, const clang::MultiLevelTemplateArgumentList&amp;):
Assertion `InstantiatingScope' failed.

<details>

<summary>Stack dump</summary>

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 &lt;source&gt;
1.	&lt;source&gt;:9:13: current parser token ')'
2.	&lt;source&gt;:8:12: parsing function body 'main'
3.	&lt;source&gt;:8:12: in compound statement ('{}')
4.	&lt;source&gt;:2:18: instantiating function definition '(anonymous class)::operator()&lt;int&gt;'
 #<!-- -->0 0x0000000003ea56b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ea56b8)
 #<!-- -->1 0x0000000003ea3344 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ea3344)
 #<!-- -->2 0x0000000003de8488 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007a01e8642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007a01e86969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007a01e8642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007a01e86287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007a01e862871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007a01e8639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x00000000067ad2ee clang::Sema::addInstantiatedCapturesToScope(clang::FunctionDecl*, clang::FunctionDecl const*, clang::LocalInstantiationScope&amp;, clang::MultiLevelTemplateArgumentList const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67ad2ee)
#<!-- -->10 0x0000000006be427f clang::Sema::LambdaScopeForCallOperatorInstantiationRAII::LambdaScopeForCallOperatorInstantiationRAII(clang::Sema&amp;, clang::FunctionDecl*, clang::MultiLevelTemplateArgumentList, clang::LocalInstantiationScope&amp;, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6be427f)
#<!-- -->11 0x00000000067ba8bf clang::Sema::CheckFunctionConstraints(clang::FunctionDecl const*, clang::ConstraintSatisfaction&amp;, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67ba8bf)
#<!-- -->12 0x0000000006df3895 clang::Sema::AddMethodCandidate(clang::CXXMethodDecl*, clang::DeclAccessPair, clang::CXXRecordDecl*, clang::QualType, clang::Expr::Classification, llvm::ArrayRef&lt;clang::Expr*&gt;, clang::OverloadCandidateSet&amp;, bool, bool, llvm::MutableArrayRef&lt;clang::ImplicitConversionSequence&gt;, clang::OverloadCandidateParamOrder, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6df3895)
#<!-- -->13 0x0000000006dfbea2 clang::Sema::AddMethodCandidate(clang::DeclAccessPair, clang::QualType, clang::Expr::Classification, llvm::ArrayRef&lt;clang::Expr*&gt;, clang::OverloadCandidateSet&amp;, bool, clang::OverloadCandidateParamOrder) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6dfbea2)
#<!-- -->14 0x0000000006e13022 clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e13022)
#<!-- -->15 0x0000000006a1c643 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1c643)
#<!-- -->16 0x0000000006a1cf2c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1cf2c)
#<!-- -->17 0x0000000007088c48 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->18 0x0000000007077642 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->19 0x00000000070a5d87 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformStmt(clang::Stmt*, clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::StmtDiscardKind) SemaTemplateInstantiate.cpp:0:0
#<!-- -->20 0x00000000070a699e clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#<!-- -->21 0x00000000070769d4 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformLambdaExpr(clang::LambdaExpr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->22 0x0000000007077d2e clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->23 0x000000000707a865 clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformInitializer(clang::Expr*, bool) (.part.0) SemaTemplateInstantiate.cpp:0:0
#<!-- -->24 0x000000000707ac0c clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformReturnStmt(clang::ReturnStmt*) SemaTemplateInstantiate.cpp:0:0
#<!-- -->25 0x00000000070a699e clang::TreeTransform&lt;(anonymous namespace)::TemplateInstantiator&gt;::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#<!-- -->26 0x00000000070af9d4 clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70af9d4)
#<!-- -->27 0x000000000712b29d clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x712b29d)
#<!-- -->28 0x0000000007db96d1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7db96d1)
#<!-- -->29 0x0000000006f8924a clang::Sema::DeduceReturnType(clang::FunctionDecl*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6f8924a)
#<!-- -->30 0x00000000069d43c6 clang::Sema::DiagnoseUseOfDecl(clang::NamedDecl*, llvm::ArrayRef&lt;clang::SourceLocation&gt;, clang::ObjCInterfaceDecl const*, bool, bool, clang::ObjCInterfaceDecl*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69d43c6)
#<!-- -->31 0x0000000006dd1ef7 CreateFunctionRefExpr(clang::Sema&amp;, clang::FunctionDecl*, clang::NamedDecl*, clang::Expr const*, bool, clang::SourceLocation, clang::DeclarationNameLoc const&amp;) SemaOverload.cpp:0:0
#<!-- -->32 0x0000000006e139aa clang::Sema::BuildCallToObjectOfClassType(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e139aa)
#<!-- -->33 0x0000000006a1c643 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1c643)
#<!-- -->34 0x0000000006a1cf2c clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef&lt;clang::Expr*&gt;, clang::SourceLocation, clang::Expr*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a1cf2c)
#<!-- -->35 0x00000000065581f2 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult&lt;clang::Expr*, true&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65581f2)
#<!-- -->36 0x0000000006550b71 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6550b71)
#<!-- -->37 0x0000000006552cd7 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6552cd7)
#<!-- -->38 0x0000000006552d69 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6552d69)
#<!-- -->39 0x0000000006557739 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6557739)
#<!-- -->40 0x00000000065db339 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65db339)
#<!-- -->41 0x00000000065d3052 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&lt;clang::Stmt*, 24u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65d3052)
#<!-- -->42 0x00000000065d3f7d clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 24u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65d3f7d)
#<!-- -->43 0x00000000065dba33 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65dba33)
#<!-- -->44 0x00000000065dc1fa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65dc1fa)
#<!-- -->45 0x00000000064e5c93 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e5c93)
#<!-- -->46 0x000000000651b22d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x651b22d)
#<!-- -->47 0x00000000064d98ae clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d98ae)
#<!-- -->48 0x00000000064da069 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64da069)
#<!-- -->49 0x00000000064e1933 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e1933)
#<!-- -->50 0x00000000064e284d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64e284d)
#<!-- -->51 0x00000000064d4d9a clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x64d4d9a)
#<!-- -->52 0x000000000483cac8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x483cac8)
#<!-- -->53 0x0000000004b2b555 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b2b555)
#<!-- -->54 0x0000000004aad19e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4aad19e)
#<!-- -->55 0x0000000004c1bb1e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c1bb1e)
#<!-- -->56 0x0000000000d5dc0f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd5dc0f)
#<!-- -->57 0x0000000000d553ca ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->58 0x00000000048a2469 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
#<!-- -->59 0x0000000003de8924 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3de8924)
#<!-- -->60 0x00000000048a2a7f 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
#<!-- -->61 0x000000000486543d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x486543d)
#<!-- -->62 0x00000000048664ce 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+++0x48664ce)
#<!-- -->63 0x000000000486dbd5 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+++0x486dbd5)
#<!-- -->64 0x0000000000d5aa08 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd5aa08)
#<!-- -->65 0x0000000000c20d34 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc20d34)
#<!-- -->66 0x00007a01e8629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->67 0x00007a01e8629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->68 0x0000000000d54e75 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd54e75)

</details>

zyn0217
self-assigned this
on Mar 31, 2025
shafik
added
confirmedVerified by a second party
regression:20Regression in 20 release
on Mar 31, 2025
shafik
added this to Clang Regressionson Mar 31, 2025
zyn0217

zyn0217 commented on Mar 31, 2025

@zyn0217
zyn0217
on Mar 31, 2025
Contributor

You'll get a crash on invalid prior to 20 if you somehow use the init-captured variable:

https://compiler-explorer.com/z/cqooEnq4j

shafik

shafik commented on Mar 31, 2025

@shafik
shafik
on Mar 31, 2025
Collaborator

You'll get a crash on invalid prior to 20 if you somehow use the init-captured variable:

https://compiler-explorer.com/z/cqooEnq4j

Do you think they are the same bug or two different bugs?

shafik

shafik commented on Mar 31, 2025

@shafik
shafik
on Mar 31, 2025
Collaborator

clang accepts this but other implementations don't: https://godbolt.org/z/bzafoj14f

void f() {
    auto f{ 
      [](auto arg) {
        return [a = arg]() 
          requires (a == 1)
         { return a;};
      }
    };

    f(10);
}
shafik

shafik commented on Mar 31, 2025

@shafik
shafik
on Mar 31, 2025 · edited by shafik
Collaborator

@LYP951018 git bisect point to 52126dc as the cause, my guess is that this just uncovers the previous issue.

shafik

shafik commented on Mar 31, 2025

@shafik
shafik
on Mar 31, 2025
Collaborator

@erichkeane git bisect the crash that goes back further is linked to babdef2

zyn0217
mentioned this on Apr 1, 2025
zyn0217
closed this as completedin #133863on Apr 3, 2025
zyn0217
closed this as completedin dcc2182on Apr 3, 2025
github-project-automation
moved this to Done in Clang Regressionson Apr 3, 2025
llvm-sync
added a commit that references this issue on Apr 3, 2025

[Clang] Fix a lambda pattern comparison mismatch after ecc7e6c (#133863)

dcc2182
zyn0217
mentioned this on Apr 3, 2025
zyn0217

zyn0217 commented on Apr 3, 2025

@zyn0217
zyn0217
on Apr 3, 2025
Contributor

You'll get a crash on invalid prior to 20 if you somehow use the init-captured variable:
https://compiler-explorer.com/z/cqooEnq4j

Do you think they are the same bug or two different bugs?

They're different. I filed #134193 to track these.

llvm-sync
added a commit that references this issue on Apr 3, 2025

Automerge: [Clang] Fix a lambda pattern comparison mismatch after ecc…

f3c4e1d
swift-ci
added a commit that references this issue on Apr 15, 2025

[Clang] Fix a lambda pattern comparison mismatch after ecc7e6c (llvm#…

9420327
llvm-sync
added a commit that references this issue on May 15, 2025

Automerge: [Clang] Fix a lambda pattern comparison mismatch after ecc…

cf91006
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

Labels

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"confirmedVerified by a second partyconstexprAnything related to constant evaluationcrashPrefer [crash-on-valid] or [crash-on-invalid]lambdaC++11 lambda expressionsregression:20Regression in 20 release

Type

Bug

Projects

Clang Regressions

Status

Done

Milestone

No milestone

Relationships

None yet

    Development

    Participants

    @shafik@EugeneZelenko@llvmbot@MagentaTreehouse@zyn0217

    Issue actions
      [Clang][Regression:20] Crash on constraint for lambda in lambda with init-capture · Issue #133719 · llvm/llvm-project