================
@@ -507,10 +507,62 @@ static TemplateDeductionResult
DeduceNonTypeTemplateArgument(
S, TemplateParams, NTTP, DeducedTemplateArgument(New), T, Info, Deduced);
}
+static NamedDecl *DeduceTemplateArguments(Sema &S, NamedDecl *A,
+ TemplateArgument Default) {
+ switch (A->getKind()) {
+ case Decl::TemplateTypeParm: {
+ auto *T = cast<TemplateTypeParmDecl>(A);
+ // FIXME: DefaultArgument can't represent a pack.
+ if (T->isParameterPack())
----------------
cor3ntin wrote:
My question was more whether we want to deduce packs at all.
I think the new behavior make sense, in that it is consistent with
https://eel.is/c++draft/temp.deduct#partial-11 (
I suspect because both candidates are valid, this tie breaker gets triggered)
We might change that in the future, but now packs can't be defaulted, so I
struggle to come up to think of a case where considering the pack would change
the order of partial ordering (and not trailing packs can't be deduced)
here are more tests which I think are consistent https://godbolt.org/z/5Ke3TGfK6
https://github.com/llvm/llvm-project/pull/89807
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