================
@@ -2000,14 +2009,20 @@ class SubstituteParameterMappings {
const MultiLevelTemplateArgumentList *MLTAL;
const ASTTemplateArgumentListInfo *ArgsAsWritten;
- bool InFoldExpr;
+ // When normalizing a fold constraint, e.g.
+ // C<Pack1, Pack2...> && ...
+ // we want the TreeTransform to expand only Pack2 but not Pack1,
+ // since Pack1 will be expanded during the evaluation of C.
----------------
cor3ntin wrote:
```suggestion
// since Pack1 will be expanded during the evaluation of the fold expression.
```
https://github.com/llvm/llvm-project/pull/177531
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