================
@@ -11757,6 +11791,42 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl
*Found, Decl *Templated,
return;
}
+ // Errors in deduction guides from inherited constructors
+ // will manifest as substitution failures in the return type
+ // partial specialization, so we show a generic diagnostic
+ // in this case.
+ if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(Templated);
----------------
AaronBallman wrote:
```suggestion
if (const auto *DG = dyn_cast<CXXDeductionGuideDecl>(Templated);
```
and handle const correctness further down as well.
https://github.com/llvm/llvm-project/pull/98788
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