gcc/testsuite/gdc.test/compilable/test19557.d

// https://issues.dlang.org/show_bug.cgi?id=19557
// Error: redundant linkage `extern (C++)`
    
extern(C++, "ns")
extern(C++, class)
struct test {}

extern(C++, class)
extern(C++, "ns")
struct test2 {}