This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 115d. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-10-26
[Voted into the WP at the March, 2011 meeting as part of paper N3262.]
It was intended for empty pack expansions to be useful in contexts like base-specifiers, e.g.,
template<class... T> struct A : T... {};
A<> x; // ok?
However, the current wording provides no description of how that might work. (More generally, the problem arises in any context where the pack expansion follows a token that should only be present when the pack expansion is non-empty: following another argument in a function call, etc.)