assert_op
#define assert_eq(lhs, rhs, fmt) assert_op(lhs, rhs, fmt, ==)
#define assert_ne(lhs, rhs, fmt) assert_op(lhs, rhs, fmt, !=)
#define assert_lt(lhs, rhs, fmt) assert_op(lhs, rhs, fmt, <)
#define assert_ge(lhs, rhs, fmt) assert_op(lhs, rhs, fmt, >=)