[Bug c++/115915] gcc fails to detect invalid friend declaration of classes in different namespaces

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115915

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 60003
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60003&action=edit
A better testcase

This shows what is happening; basically this friend is causing to define a
class extent in the namespace enclosed by class S. It happens for templates
definitions.