================
@@ -402,6 +402,19 @@ bool Sema::DiagnoseUnexpandedParameterPack(Expr *E,
if (!E->containsUnexpandedParameterPack())
return false;
+ // Exception: The `CollectUnexpandedParameterPacksVisitor` collects nothing
+ // from a FunctionParmPackExpr. In the context where the collector is being
+ // used such as `collectUnexpandedParameterPacks`, this type of expression
+ // is not expected to be collected.
+ //
+ // Nonetheless, this function for diagnosis is still called anyway during
+ // template instantiation, with an expression of such a type if we're inside
a
+ // lambda with unexpanded parameters.
+ //
+ // Rule out this case to prevent the assertion failure.
----------------
AaronBallman wrote:
```suggestion
// CollectUnexpandedParameterPacksVisitor does not expect to see a
FunctionParmPackExpr, but
// diagnosing unexpected parameter packs may still see such an expression in
a lambda body. We'll
// bail out early in this case to avoid triggering an assertion.
```
Slight rewording.
https://github.com/llvm/llvm-project/pull/69224
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