This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
The grammar does not allow for a declaration of the form
using T = enum class E : int;
However, it is widely accepted by current implementations. Should the rules be changed to accommodate this usage?
Rationale (November, 2014):
A type-id is intended as a reference to a type, but the opaque enumeration syntax is intended as a declaration, not a reference like an elaborated-type-specifier, so the current rules are as intended.