https://issues.dlang.org/show_bug.cgi?id=13337
--- Comment #1 from Guillaume Chatelet <chatelet.guillaume at gmail.com> ---
Specifying the mangling explicitely does work though
extern(C++, A.B) {
struct Type {}
pragma(mangle,"_ZN1A1B3fooENS0_4TypeE") int foo(Type unused);
}
--