[Bug c++/59816] [c++11] Incorrect visibility check in template instantiation when the default constructor is a variadic template.

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59816

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed for 5.0. I'm adding the testcase and closing the bug.