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This was causing a crash when enabling the expression log:

4   LLDB                          	       0x1376d68d0 llvm::formatv_object_base::parseFormatString(llvm::StringRef, unsigned long, bool) + 532
5   LLDB                          	       0x13776d838 llvm::formatv_object_base::format(llvm::raw_ostream&) const + 84
6   LLDB                          	       0x13776d7d4 llvm::raw_ostream::operator<<(llvm::formatv_object_base const&) + 36
7   LLDB                          	       0x1375f4980 lldb_private::Log::Format(llvm::StringRef, llvm::StringRef, llvm::formatv_object_base const&) + 164
8   LLDB                          	       0x12f7b39f0 lldb_private::AppleObjCExternalASTSource::CompleteType(clang::TagDecl*) + 416
9   LLDB                          	       0x12fa038dc lldb_private::ClangASTSource::FindExternalLexicalDecls(clang::DeclContext const*, llvm::function_ref<bool (clang::Decl::Kind)>, llvm::SmallVectorImpl<clang::Decl*>&) + 1132
10  LLDB                          	       0x135d94838 clang::ExternalASTSource::FindExternalLexicalDecls(clang::DeclContext const*, llvm::SmallVectorImpl<clang::Decl*>&) + 92
11  LLDB                          	       0x135d94690 clang::DeclContext::LoadLexicalDeclsFromExternalStorage() const + 204
12  LLDB                          	       0x135d95ca0 clang::DeclContext::buildLookup() + 308
13  LLDB                          	       0x135d964b8 clang::DeclContext::lookupImpl(clang::DeclarationName, clang::DeclContext const*) const + 824
14  LLDB                          	       0x135d96168 clang::DeclContext::lookup(clang::DeclarationName) const + 124
15  LLDB                          	       0x134f093d4 clang::Sema::CheckImplicitSpecialMemberDeclaration(clang::Scope*, clang::FunctionDecl*) + 128
16  LLDB                          	       0x134efb488 clang::Sema::DeclareImplicitDestructor(clang::CXXRecordDecl*) + 932
17  LLDB                          	       0x1352ddf24 clang::Sema::LookupSpecialMember(clang::CXXRecordDecl*, clang::CXXSpecialMemberKind, bool, bool, bool, bool, bool)::$_0::operator()() const + 36

(cherry picked from commit 90783f5)

…lvm#172263)

This was causing a crash when enabling the expression log:
```
4   LLDB                          	       0x1376d68d0 llvm::formatv_object_base::parseFormatString(llvm::StringRef, unsigned long, bool) + 532
5   LLDB                          	       0x13776d838 llvm::formatv_object_base::format(llvm::raw_ostream&) const + 84
6   LLDB                          	       0x13776d7d4 llvm::raw_ostream::operator<<(llvm::formatv_object_base const&) + 36
7   LLDB                          	       0x1375f4980 lldb_private::Log::Format(llvm::StringRef, llvm::StringRef, llvm::formatv_object_base const&) + 164
8   LLDB                          	       0x12f7b39f0 lldb_private::AppleObjCExternalASTSource::CompleteType(clang::TagDecl*) + 416
9   LLDB                          	       0x12fa038dc lldb_private::ClangASTSource::FindExternalLexicalDecls(clang::DeclContext const*, llvm::function_ref<bool (clang::Decl::Kind)>, llvm::SmallVectorImpl<clang::Decl*>&) + 1132
10  LLDB                          	       0x135d94838 clang::ExternalASTSource::FindExternalLexicalDecls(clang::DeclContext const*, llvm::SmallVectorImpl<clang::Decl*>&) + 92
11  LLDB                          	       0x135d94690 clang::DeclContext::LoadLexicalDeclsFromExternalStorage() const + 204
12  LLDB                          	       0x135d95ca0 clang::DeclContext::buildLookup() + 308
13  LLDB                          	       0x135d964b8 clang::DeclContext::lookupImpl(clang::DeclarationName, clang::DeclContext const*) const + 824
14  LLDB                          	       0x135d96168 clang::DeclContext::lookup(clang::DeclarationName) const + 124
15  LLDB                          	       0x134f093d4 clang::Sema::CheckImplicitSpecialMemberDeclaration(clang::Scope*, clang::FunctionDecl*) + 128
16  LLDB                          	       0x134efb488 clang::Sema::DeclareImplicitDestructor(clang::CXXRecordDecl*) + 932
17  LLDB                          	       0x1352ddf24 clang::Sema::LookupSpecialMember(clang::CXXRecordDecl*, clang::CXXSpecialMemberKind, bool, bool, bool, bool, bool)::$_0::operator()() const + 36
```

(cherry picked from commit 90783f5)
@Michael137 Michael137 requested a review from a team as a code owner December 15, 2025 10:31
@Michael137
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@swift-ci test

@Michael137
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@swift-ci test Windows

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