const foo *null_foo = NULL;
+bar B;
extern bar &B1;
+bar &B1 = B;
extern const bar *B2;
// test various configurations of const
const bar &B3 = B1;
//foo &F23 = cast_or_null<foo>(B1);
//const foo &F24 = cast_or_null<foo>(B3);
-
-bar B;
-bar &B1 = B;
const bar *B2 = &B;
} // anonymous namespace