C++ namespaces lexed as Name and not Name.Namespace

[amitkummer]

This happens when declaring a namespace:

namespace std {}

std is lexed as Name and not Name.Namespace.

Also I don't see this being done in other lexers, maybe I didn't look enough so correct me if I'm wrong and this behavior is fine, but when prefixing names with their namespaces the namespaces are matched as just a Name :

std::optional{}

std is matched as Name.