================
@@ -859,8 +861,10 @@ class PackDeductionScope {
// by this pack expansion, then clear out the deduction.
DeducedFromEarlierParameter = !Deduced[Index].isNull();
DeducedPack Pack(Index);
- Pack.Saved = Deduced[Index];
- Deduced[Index] = TemplateArgument();
+ if (!FinishingDeduction) {
+ Pack.Saved = Deduced[Index];
+ Deduced[Index] = TemplateArgument();
+ }
----------------
zygoloid wrote:
A comment describing what `FinishingDeducing` is for would be useful. It looks
like the intent is that in this mode we just gather information and don't
update `Deduced` at all; if so, there's an update to `Deduced` in
`finishConstruction` that you might have missed.
https://github.com/llvm/llvm-project/pull/100692
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