struct ClassToStruct {
  long x;
};

union ClassToUnion {
  long x;
};

class StructToClass {
  long x;
};

union StructToUnion {
  long x;
};

class UnionToClass {
  long x;
};

struct UnionToStruct {
  long x;
};

ClassToStruct class_to_struct;
ClassToUnion class_to_union;
StructToClass struct_to_class;
StructToUnion struct_to_union;
UnionToClass union_to_class;
UnionToStruct union_to_struct;