================
@@ -11723,6 +11764,40 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl
*Found, Decl *Templated,
return;
}
+ // Errors in deduction guides from inherited constructors
+ // will present as substitution failures in the mapping
+ // partial specialization, so we show a generic diagnostic
+ // in this case.
+ if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(Templated);
+ DG && DG->getSourceKind() ==
+ CXXDeductionGuideDecl::SourceKind::InheritedConstructor) {
+ CXXDeductionGuideDecl *Source = DG->getSourceDeductionGuide();
+ assert(Source &&
+ "Inherited constructor deduction guides must have a source");
----------------
mizvekov wrote:
By calling `getSourceKind()`, you already assumed there is a source deduction
guide, as otherwise the kind value is meaningless. See previous comment.
https://github.com/llvm/llvm-project/pull/98788
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