address comment

Author: Backl1ght

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

@@ -7062,11 +7062,12 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
   }
 
   if (!ParentDependsOnArgs) {
-    if (auto Found =
-            CurrentInstantiationScope
-                ? CurrentInstantiationScope->getInstantiationOfIfExists(D)
-                : nullptr) {
-      return cast<NamedDecl>(Found->dyn_cast<Decl *>());
+    if (CurrentInstantiationScope) {
+      if (llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> *Found =
+          CurrentInstantiationScope->getInstantiationOfIfExists(D)) {
+        if (Decl* FD = Found->dyn_cast<Decl *>())
+          return cast<NamedDecl>(FD);
+      }
     }
     return D;
   }