[Bug c++/65047] New: [c++17] Add support for nested namespace defintions.

[andrea.azzarone at canonical dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65047

            Bug ID: 65047
           Summary: [c++17] Add support for nested namespace defintions.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrea.azzarone at canonical dot com

Gcc should support nested namespace defintions as per N4230. Basically it
allows to do stuff like this:

namespace A::B {
 ... 
}