module cppmangle3; extern(C++, "true") { } extern(C++, "__traits") { } extern(C++, "foo") { } int foo; // no name clashing with above namespace extern(C++, "std", "chrono") { void func(); } version(Windows) static assert(func.mangleof == "?func@chrono@std@@YAXXZ"); else static assert(func.mangleof == "_ZNSt6chrono4funcEv"); struct Foo { extern(C++, "namespace") { static void bar(); } } alias Alias(alias a) = a; alias Alias(T) = T; static assert(is(Alias!(__traits(parent, bar)) == Foo));