================
@@ -4371,6 +4397,41 @@ Sema::TemplateDeductionResult
Sema::DeduceTemplateArguments(
// corresponding argument is a list?
PackScope.nextPackElement();
}
+ } else if (!IsTrailingPack && !PackScope.isPartiallyExpanded() &&
+ PackScope.isDeducedFromEarlierParameter() &&
+ !isa<PackExpansionType>(ParamTypes[ParamIdx + 1])) {
+ // [temp.deduct.general#3]
+ // When all template arguments have been deduced
+ // or obtained from default template arguments, all uses of template
+ // parameters in the template parameter list of the template are
+ // replaced with the corresponding deduced or default argument values
+ //
+ // If we have a trailing parameter pack, that has been deduced
+ // perviously we substitute the pack here in a similar fashion as seen
+ // above with the trailing parameter packs. The main difference here is
+ // that, in this case we are not processing all of the remaining
+ // arguments. We are only process as many arguments as much we have in
+ // the already deduced parameter.
+ SmallVector<UnexpandedParameterPack, 2> Unexpanded;
+ collectUnexpandedParameterPacks(ParamPattern, Unexpanded);
+ if (Unexpanded.size() == 0)
+ continue;
----------------
cor3ntin wrote:
can `unexpanded` ever be empty? This should be an assert
https://github.com/llvm/llvm-project/pull/79371
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