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HolyBlackCat opened this issue Oct 6, 2024 · 6 comments
Open

Crash when passing a lambda to function in decltype, or no viable conversion from lambda to itself #111283

HolyBlackCat opened this issue Oct 6, 2024 · 6 comments
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@mizvekov
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clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash Prefer [crash-on-valid] or [crash-on-invalid] lambda C++11 lambda expressions

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@HolyBlackCat
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HolyBlackCat commented Oct 6, 2024 •
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The following code sometimes segfaults the compiler, and sometimes gives a nonsensical error.

v1:

void foo(auto &&) {}
auto bar(auto &&a) -> decltype (foo([]( auto && ... ){})) {}
struct A {};

int main()
{
    bar(A());
}

v2:

namespace N
{
    void foo(auto &&) {}
    auto bar(auto &&a) -> decltype (foo([]( auto && ... ){})) {}
    struct A {};
}

int main()
{
    bar(N::A());
}

Here's v1 segfaulting Clang 19: https://gcc.godbolt.org/z/1Ycq96r6b

And v2 emits this error:

<source>:10:5: error: no matching function for call to 'bar'
   10 |     bar(N::A());
      |     ^~~
<source>:4:10: note: candidate template ignored: substitution failure [with a:auto = N::A]: no viable conversion from '(lambda at <source>:4:41)' to 'N::(lambda at <source>:4:41)'
    4 |     auto bar(auto &&a) -> decltype (foo([]( auto && ... ){})) {}
      |          ^

There's some variance here. My local Clang 19 (as opposed to godbolt) segfaults on v2 instead, and emits this error on v1.

Clang 18 and trunk on godbolt emits this error instead of segfaulting on both v1 and v2.
@EugeneZelenko EugeneZelenko added clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] lambda C++11 lambda expressions confirmed Verified by a second party and removed new issue labels Oct 6, 2024
@llvmbot
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llvmbot commented Oct 6, 2024

@llvm/issue-subscribers-clang-frontend

Author: Egor (HolyBlackCat)

The following code sometimes segfaults the compiler, and sometimes gives a nonsensical error.

v1:

void foo(auto &amp;&amp;) {}
auto bar(auto &amp;&amp;a) -&gt; decltype (foo([]( auto &amp;&amp; ... ){})) {}
struct A {};

int main()
{
    bar(A());
}

v2:

namespace N
{
    void foo(auto &amp;&amp;) {}
    auto bar(auto &amp;&amp;a) -&gt; decltype (foo([]( auto &amp;&amp; ... ){})) {}
    struct A {};
}

int main()
{
    bar(N::A());
}

Here's v1 segfaulting Clang 19: https://gcc.godbolt.org/z/1Ycq96r6b

And v2 emits this error:

&lt;source&gt;:10:5: error: no matching function for call to 'bar'
   10 |     bar(N::A());
      |     ^~~
&lt;source&gt;:4:10: note: candidate template ignored: substitution failure [with a:auto = N::A]: no viable conversion from '(lambda at &lt;source&gt;:4:41)' to 'N::(lambda at &lt;source&gt;:4:41)'
    4 |     auto bar(auto &amp;&amp;a) -&gt; decltype (foo([]( auto &amp;&amp; ... ){})) {}
      |          ^

There's some variance here. My local Clang 19 (as opposed to godbolt) segfaults on v2 instead, and emits this error on v1.

Clang 18 and trunk on godbolt emits this error instead of segfaulting on both v1 and v2.

@EugeneZelenko
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Also crashes in main: https://gcc.godbolt.org/z/c17saz63c

@shafik
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shafik commented Oct 7, 2024 •
edited
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Crash goes back to clang-10: https://gcc.godbolt.org/z/b7eP865ds

Assertion:

clang++: /root/llvm-project/clang/include/clang/AST/TemplateBase.h:439:
unsigned int clang::TemplateArgument::pack_size() const:
Assertion `getKind() == Pack' failed.

Backtrace:

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>:7:12: current parser token ')'
2.	<source>:6:1: parsing function body 'main'
3.	<source>:6:1: in compound statement ('{}')
 #0 0x0000000003b99d28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b99d28)
 #1 0x0000000003b979ec llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b979ec)
 #2 0x0000000003ae61f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fc8ed642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007fc8ed6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007fc8ed642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007fc8ed6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007fc8ed62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007fc8ed639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000074474db clang::Sema::CheckParameterPacksForExpansion(clang::SourceLocation, clang::SourceRange, llvm::ArrayRef<std::pair<llvm::PointerUnion<clang::TemplateTypeParmType const*, clang::NamedDecl*>, clang::SourceLocation>>, clang::MultiLevelTemplateArgumentList const&, bool&, bool&, std::optional<unsigned int>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x74474db)
#10 0x00000000073b57ec clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformFunctionTypeParams(clang::SourceLocation, llvm::ArrayRef<clang::ParmVarDecl*>, clang::QualType const*, clang::FunctionType::ExtParameterInfo const*, llvm::SmallVectorImpl<clang::QualType>&, llvm::SmallVectorImpl<clang::ParmVarDecl*>*, clang::Sema::ExtParameterInfoBuilder&, unsigned int*) SemaTemplateInstantiate.cpp:0:0
#11 0x00000000073938e6 clang::QualType clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformFunctionProtoType<clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformFunctionProtoType(clang::TypeLocBuilder&, clang::FunctionProtoTypeLoc)::'lambda'(clang::FunctionProtoType::ExceptionSpecInfo&, bool&)>(clang::TypeLocBuilder&, clang::FunctionProtoTypeLoc, clang::CXXRecordDecl*, clang::Qualifiers, clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformFunctionProtoType(clang::TypeLocBuilder&, clang::FunctionProtoTypeLoc)::'lambda'(clang::FunctionProtoType::ExceptionSpecInfo&, bool&)) (.constprop.0) SemaTemplateInstantiate.cpp:0:0
#12 0x000000000739491f clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformType(clang::TypeLocBuilder&, clang::TypeLoc) SemaTemplateInstantiate.cpp:0:0
#13 0x0000000007381acc clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformLambdaExpr(clang::LambdaExpr*) SemaTemplateInstantiate.cpp:0:0
#14 0x000000000738380e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#15 0x00000000073859e8 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformInitializer(clang::Expr*, bool) (.part.0) SemaTemplateInstantiate.cpp:0:0
#16 0x0000000007385438 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExprs(clang::Expr* const*, unsigned int, bool, llvm::SmallVectorImpl<clang::Expr*>&, bool*) SemaTemplateInstantiate.cpp:0:0
#17 0x0000000007390991 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#18 0x0000000007383126 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#19 0x00000000073945a2 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformType(clang::TypeLocBuilder&, clang::TypeLoc) SemaTemplateInstantiate.cpp:0:0
#20 0x00000000073b8b8c clang::Sema::SubstFunctionDeclType(clang::TypeSourceInfo*, clang::MultiLevelTemplateArgumentList const&, clang::SourceLocation, clang::DeclarationName, clang::CXXRecordDecl*, clang::Qualifiers, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x73b8b8c)
#21 0x00000000073e308e clang::TemplateDeclInstantiator::SubstFunctionType(clang::FunctionDecl*, llvm::SmallVectorImpl<clang::ParmVarDecl*>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x73e308e)
#22 0x00000000074380c2 clang::TemplateDeclInstantiator::VisitFunctionDecl(clang::FunctionDecl*, clang::TemplateParameterList*, clang::TemplateDeclInstantiator::RewriteKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x74380c2)
#23 0x000000000743c654 void llvm::function_ref<void ()>::callback_fn<clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&)::'lambda'()>(long) SemaTemplateInstantiateDecl.cpp:0:0
#24 0x00000000067918f1 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67918f1)
#25 0x00000000073e2e4a clang::Sema::SubstDecl(clang::Decl*, clang::DeclContext*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x73e2e4a)
#26 0x00000000072901eb clang::Sema::FinishTemplateArgumentDeduction(clang::FunctionTemplateDecl*, llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, llvm::SmallVectorImpl<clang::Sema::OriginalCallArg> const*, bool, llvm::function_ref<bool ()>) (.constprop.0) SemaTemplateDeduction.cpp:0:0
#27 0x000000000729108a void llvm::function_ref<void ()>::callback_fn<clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, bool, clang::QualType, clang::Expr::Classification, llvm::function_ref<bool (llvm::ArrayRef<clang::QualType>)>)::'lambda1'()>(long) SemaTemplateDeduction.cpp:0:0
#28 0x00000000067918f1 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67918f1)
#29 0x00000000072abca5 clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool, bool, clang::QualType, clang::Expr::Classification, llvm::function_ref<bool (llvm::ArrayRef<clang::QualType>)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72abca5)
#30 0x00000000070a68d8 clang::Sema::AddTemplateOverloadCandidate(clang::FunctionTemplateDecl*, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool, bool, clang::CallExpr::ADLCallKind, clang::OverloadCandidateParamOrder, bool) (.constprop.1) SemaOverload.cpp:0:0
#31 0x00000000070a70db AddOverloadedCallCandidate(clang::Sema&, clang::DeclAccessPair, clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, bool) SemaOverload.cpp:0:0
#32 0x00000000070a73c9 clang::Sema::AddOverloadedCallCandidates(clang::UnresolvedLookupExpr*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70a73c9)
#33 0x00000000070a76ce clang::Sema::buildOverloadedCallSet(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::OverloadCandidateSet*, clang::ActionResult<clang::Expr*, true>*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70a76ce)
#34 0x00000000070b3dc5 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-assertions-trunk/bin/clang+++0x70b3dc5)
#35 0x0000000006c2d528 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+++0x6c2d528)
#36 0x0000000006c2fa8c 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+++0x6c2fa8c)
#37 0x000000000669d3fd clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669d3fd)
#38 0x0000000006695dc1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6695dc1)
#39 0x0000000006697f17 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6697f17)
#40 0x0000000006697fa9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6697fa9)
#41 0x000000000669c9c9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669c9c9)
#42 0x000000000671f4a9 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x671f4a9)
#43 0x000000000671587c 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+++0x671587c)
#44 0x0000000006716790 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6716790)
#45 0x0000000006717665 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6717665)
#46 0x0000000006718dba clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6718dba)
#47 0x000000000662bec3 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662bec3)
#48 0x00000000066612cd 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+++0x66612cd)
#49 0x000000000661fc0e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x661fc0e)
#50 0x00000000066203ce clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66203ce)
#51 0x0000000006627b63 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6627b63)
#52 0x0000000006628a4d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6628a4d)
#53 0x000000000661af6a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x661af6a)
#54 0x00000000044f0998 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44f0998)
#55 0x00000000047aa2e9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47aa2e9)
#56 0x0000000004728c2e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4728c2e)
#57 0x000000000488fb6e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x488fb6e)
#58 0x0000000000cd801f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd801f)
#59 0x0000000000ccfd2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#60 0x0000000004534669 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
#61 0x0000000003ae66a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ae66a4)
#62 0x0000000004534c5f 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
#63 0x00000000044fa59d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44fa59d)
#64 0x00000000044fb68d 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+++0x44fb68d)
#65 0x0000000004502fb5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4502fb5)
#66 0x0000000000cd4eef clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd4eef)
#67 0x0000000000ba49a4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba49a4)
#68 0x00007fc8ed629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#69 0x00007fc8ed629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#70 0x0000000000ccf7de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xccf7de)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

@shafik
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shafik commented Oct 7, 2024

Maybe related: #62617

CC @cor3ntin

@cor3ntin
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cor3ntin commented Oct 7, 2024

@mizvekov does your lambda patch help with that?

@mizvekov
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mizvekov commented Oct 7, 2024

Yes it does, for both examples.
FYI #107942

@mizvekov mizvekov self-assigned this Feb 27, 2025
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@mizvekov @cor3ntin @shafik @EugeneZelenko @HolyBlackCat @llvmbot