Should an 'extern(C++, "ns"):' override previous ones in the same scope?

[Max Samukha via Digitalmars-d-learn]

extern(C++, "ns1"):
extern(C++, "ns2"): // Not in nested scope. Should it supersede?
void foo();
pragma(msg, foo.mangleof); // _ZN3ns13ns23fooEv instead of 
expected _ZN3ns23fooEv

Is that by design?