[Bug c++/126653] ICE on spliced namespace in using directive

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126653

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We don't detect [namespace.udir]/1: The splice-specifier (if any) shall
designate a namespace that is not the global namespace.
The nested-name-specifier, namespace-name, and splice-specifier shall not be
dependent.

So this also needs to test using namespace [: ^^:: :];