[Bug c++/85282] CWG 727 (full specialization in non-namespace scope)

[songyuanyao at qq dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85282

--- Comment #1 from songyuanyao <songyuanyao at qq dot com> ---
The error message for the code (from gcc8.0.1):

error: explicit specialization in non-namespace scope