================
@@ -181,14 +181,14 @@ template <bool IsConst> class 
DynamicRecursiveASTVisitorBase {
   ///
   /// \returns false if the visitation was terminated early, true
   /// otherwise (including when the argument is a Null type).
-  virtual bool TraverseType(QualType T);
+  virtual bool TraverseType(QualType T, bool TraverseQualifier = true);
----------------
mizvekov wrote:

I find the parameter easier to debug, it's easier to trace how the value gets 
propagated.

With a data member / RAII object, it takes longer to figure out where, in a 
given stack trace, the value was changed.

There is also precedent for this solution here. For example see 
`clang-tools-extra/clang-tidy/modernize/UseTrailingReturnTypeCheck.cpp` 
TraverseTypeLoc implementation, where an analogous parameter was implemented 
(called 'Elaborated' instead).

https://github.com/llvm/llvm-project/pull/147835
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