================
@@ -12114,6 +12115,35 @@ static void NoteFunctionCandidate(Sema &S,
OverloadCandidate *Cand,
return;
}
+ // If this is an implicit deduction guide against an implicitly defined
+ // constructor, add a note for it. Neither these deduction guides nor their
+ // corresponding constructors are explicitly spelled in the source code,
+ // and simply producing a deduction failure note around the heading of the
+ // enclosing RecordDecl would be confusing.
+ //
+ // We prefer adding such notes at the end of the last deduction failure
+ // reason because duplicate code snippets appearing in the diagnostic
+ // would likely become noisy.
+ auto _ = llvm::make_scope_exit([&] {
+ auto *DG = dyn_cast<CXXDeductionGuideDecl>(Fn);
+ if (!DG || !DG->isImplicit() || DG->getCorrespondingConstructor())
----------------
hokein wrote:
(I assume we always print using-alias deduction guides)
Note that checking the implicit guides is not sufficient for using-alias
deduction guides. Those synthesized from the explicitly written deduction guide
will retain the explicit bit (to ensure correct function overload resolution).
https://github.com/llvm/llvm-project/pull/96084
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