https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124331
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Just avoiding the finish_qualified_id_expr call in tsubst_qualified_id when processing a REFLECT_EXPR fixes this test, bug 123621 and serialize2.C as well. Full patch to be posted soon.
