================
@@ -5697,6 +5698,39 @@ QualType ASTContext::getDecltypeType(Expr *e, QualType 
UnderlyingType) const {
   return QualType(dt, 0);
 }
 
+QualType ASTContext::getPackIndexingType(QualType Pattern, Expr *IndexExpr,
+                                         bool FullyExpanded,
+                                         ArrayRef<QualType> Expansions,
+                                         int Index) const {
+  QualType Canonical;
+  if (FullyExpanded && Index != -1) {
----------------
erichkeane wrote:

What does 'FullyExpanded' mean here?  Do we mean 'fully instantiated'?  If so, 
I would expect some level of `IndexExpr->EvaluateKnownConstInt` or something to 
be here instead of Index?

https://github.com/llvm/llvm-project/pull/72644
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