================
@@ -2010,6 +2031,25 @@ class CXXDeductionGuideDecl : public FunctionDecl {
   /// this is an implicit deduction guide.
   CXXConstructorDecl *getCorrespondingConstructor() const { return Ctor; }
 
+  /// Get the deduction guide from which this deduction guide was generated,
+  /// if it was generated as part of alias template deduction or from an
+  /// inherited constructor.
+  CXXDeductionGuideDecl *getSourceDeductionGuide() const {
----------------
AaronBallman wrote:

Yeah, we should be returning a `const` pointer from a `const` member function; 
we can add a non-`const` member function overload to return a non-`const` 
pointer if we need one.

https://github.com/llvm/llvm-project/pull/98788
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