================
@@ -1666,6 +1685,21 @@ namespace {
return inherited::TransformTemplateArgument(Input, Output, Uneval);
}
+ using TreeTransform::TransformTemplateSpecializationType;
+ QualType
+ TransformTemplateSpecializationType(TypeLocBuilder &TLB,
+ TemplateSpecializationTypeLoc TL) {
+ auto *T = TL.getTypePtr();
+ if (!getSema().ArgPackSubstIndex || !T->isSugared() ||
+ !isPackProducingBuiltinTemplateName(T->getTemplateName()))
+ return TreeTransform::TransformTemplateSpecializationType(TLB, TL);
+ // Look through sugar to get to the SubstBuiltinTemplatePackType that we
+ // need to substitute into.
+ QualType R = TransformType(T->desugar());
----------------
mizvekov wrote:
Yes the default TreeTransform implementation will rerun semantic actions, so
its a bit inefficient for sugar-only transforms, but you can customize that by
providing overrides for the Rebuild* functions.
The issue I see in this case here is that you are just dropping the
TemplateSpecializationType, why can't you just build a new one here to wrap
over the transformed underlying type?
https://github.com/llvm/llvm-project/pull/106730
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