- Is a qualified-id allowed to appear in a member-designator? - Is a template-id allowed to appear in a member-designator? - Is an offsetof expression required to be a constant expression (7.7 [[expr.const](https://wg21.link/expr.const)])? See CWG2784 for details. This issue lands right on the boundary of core and library specification, so EWG is asked to weigh in first, possibly deciding to involve L(E)WG.