<header.h>
namespace N1 {
class C1 { };
}
<other.cpp>
#include "header.h"
namespace N2 {
using N1::C1;
//...
class C2: public C1 { }; // (*)
}
Symbol lookup on C1 at line (*) produces error "Database record not found".
Note: Does same thing in 2014 but with no error message.