diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 9244191..41a3429 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -3629,6 +3629,9 @@
 ExprResult Sema::ActOnFinishFullExpr(Expr *FullExpr) {
   if (!FullExpr) return ExprError();
 
+  if (DiagnoseUnexpandedParameterPack(FullExpr))
+    return ExprError();
+
   IgnoredValueConversions(FullExpr);
   CheckImplicitConversions(FullExpr);
   return MaybeCreateExprWithCleanups(FullExpr);