amykhuang wrote:
Hi we're seeing some msan failures after this patch in tests such as
clang-tools-extra/test/clang-tidy/checkers/modernize/use-using.cpp
Here's the top of the stack trace
```
==6262==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x560847d4ff8a in
clang::DependentTemplateSpecializationTypeLoc::getQualifierLoc() const
[third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h:2502](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h?l=2502&ws=akhuang/7402&snapshot=28):9
#1 0x56084edfb6ff in
clang::DependentTemplateSpecializationTypeLoc::getLocalSourceRange() const
[third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h:2578](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h?l=2578&ws=akhuang/7402&snapshot=28):14
#2 0x56084edfb1d0 in (anonymous
namespace)::TypeLocRanger::VisitDependentTemplateSpecializationTypeLoc(clang::DependentTemplateSpecializationTypeLoc)
blaze-out/k8-fastbuild-msan/bin/third_party/llvm/llvm-project/clang/include/clang/AST/TypeNodes.inc:47:1
#3 0x56084edf0bcd in Visit
blaze-out/k8-fastbuild-msan/bin/third_party/llvm/llvm-project/clang/include/clang/AST/TypeNodes.inc:47:1
#4 0x56084edf0bcd in
clang::TypeLoc::getLocalSourceRangeImpl(clang::TypeLoc)
[third_party/llvm/llvm-project/clang/lib/AST/TypeLoc.cpp:56](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/AST/TypeLoc.cpp?l=56&ws=akhuang/7402&snapshot=28):26
#5 0x56084edf82a5 in getLocalSourceRange
[third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h:161](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/include/clang/AST/TypeLoc.h?l=161&ws=akhuang/7402&snapshot=28):12
#6 0x56084edf82a5 in clang::TypeLoc::getBeginLoc() const
[third_party/llvm/llvm-project/clang/lib/AST/TypeLoc.cpp:223](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/AST/TypeLoc.cpp?l=223&ws=akhuang/7402&snapshot=28):15
#7 0x56084ebf05c5 in clang::NestedNameSpecifierLoc::getLocalSourceRange()
const
[third_party/llvm/llvm-project/clang/lib/AST/NestedNameSpecifier.cpp:443](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/AST/NestedNameSpecifier.cpp?l=443&ws=akhuang/7402&snapshot=28):27
#8 0x56084ebf02f9 in clang::NestedNameSpecifierLoc::getSourceRange() const
[third_party/llvm/llvm-project/clang/lib/AST/NestedNameSpecifier.cpp:418](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/AST/NestedNameSpecifier.cpp?l=418&ws=akhuang/7402&snapshot=28):22
#9 0x56084c6582a3 in getSourceRange
[third_party/llvm/llvm-project/clang/include/clang/AST/NestedNameSpecifier.h:480](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/include/clang/AST/NestedNameSpecifier.h?l=480&ws=akhuang/7402&snapshot=28):59
#10 0x56084c6582a3 in clang::CXXScopeSpec::Extend(clang::ASTContext&,
clang::TypeLoc, clang::SourceLocation)
[third_party/llvm/llvm-project/clang/lib/Sema/DeclSpec.cpp:58](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/Sema/DeclSpec.cpp?l=58&ws=akhuang/7402&snapshot=28):3
#11 0x56084c7b25ea in
clang::Sema::ActOnCXXNestedNameSpecifier(clang::Scope*, clang::CXXScopeSpec&,
clang::SourceLocation, clang::OpaquePtr<clang::TemplateName>,
clang::SourceLocation, clang::SourceLocation,
llvm::MutableArrayRef<clang::ParsedTemplateArgument>, clang::SourceLocation,
clang::SourceLocation, bool)
[third_party/llvm/llvm-project/clang/lib/Sema/SemaCXXScopeSpec.cpp:883](https://cs.corp.google.com/piper///depot/google3/third_party/llvm/llvm-project/clang/lib/Sema/SemaCXXScopeSpec.cpp?l=883&ws=akhuang/7402&snapshot=28):8
```
https://github.com/llvm/llvm-project/pull/133610
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