1namespace RealNS { int UsingDecl; } 2namespace NS = RealNS; 3typedef int Typedef; 4using AliasDecl = int; 5using RealNS::UsingDecl; 6struct Struct {}; 7extern int Variable; 8namespace AnotherNS {} 9enum X { Enumerator }; 10void Overloads(); 11void Overloads(int); 12