================
@@ -5218,7 +5218,17 @@ bool TreeTransform<Derived>::TransformTemplateArguments(
std::optional<ForgetSubstitutionRAII> ForgetSubst;
if (Info.ExpandUnderForgetSubstitions)
ForgetSubst.emplace(getDerived());
- for (unsigned I = 0; I != *Info.NumExpansions; ++I) {
+
+ unsigned Start, End;
+ if (ExpansionIndex.has_value()) {
+ Start = *ExpansionIndex;
+ End = Start + 1;
----------------
erichkeane wrote:
TBH, I'm still not getting it. That said, part of the subtly here I think is
trying to do this with just a single ExpansionIndex thing, rather than causing
this to be a separate code path.
https://github.com/llvm/llvm-project/pull/200185
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