[Bug c++/59498] [DR 1430][4.9/5/6/7 Regression] Pack expansion error in template alias

[pkeir at outlook dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59498

--- Comment #13 from Paul Keir <pkeir at outlook dot com> ---
Yup, I just came up with exactly the same solution. Thanks.