gcc/testsuite/gdc.test/compilable/cppmangle2.d

module cppmangle2;

extern(C++, Namespace18922)
{
    struct Struct18922 { int i; }
}

extern(C++, std)
{
    struct vector (T);
}

extern(C++, `Namespace18922`)
{
    struct Struct18922 { int i; }
}

extern(C++, `std`)
{
    struct vector (T);
}