Which C++ compiler is used to handle the nested namespace definitions?

[rhaschke]

With (default) gcc 5 in Xenial, I get thousands of errors due to the nested namespace definitions
namespace moveit::X {}
Which compiler do you use for that feature? gcc 6?

[v4hn]

Good catch.
I was pretty sure this syntax got approved in C++14 already, but it is only part of C++17.
My workstation uses gcc 7.2 (6.3 back in March), and apparently gcc does not even mention it when compiled with -std=c++14 -pedantic.

Should be fixed by 2dfc2f3