[clang] [clang] Implement P2582R1: CTAD from inherited constructors (PR #98788)

[via cfe-commits]

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@@ -1398,5 +1807,30 @@ void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template,
           ->getTemplatedDecl())
       ->setDeductionCandidateKind(DeductionCandidate::Copy);
 
+  CXXRecordDecl *TemplatedDecl = Pattern->getTemplatedDecl();
+  if (getLangOpts().CPlusPlus23 && TemplatedDecl->hasDefinition()) {
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antangelo wrote:

Given the uncertainty with open CWG issues and the potential breakage of code on earlier standards versions, I think it's less risky to keep it constrained to C++23 for now. It's probably worth revisiting in the future, though.

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