things should be done.
IEEE 754 single-precision float，推荐阅读新收录的资料获取更多信息
In Rust, the registration table is a static array of MogCapEntry structs (shown in Step 2 above). The #[unsafe(link_section = "__DATA,__mod_init_func")] attribute ensures registration runs before main() on macOS.，更多细节参见新收录的资料
_ = return err(f"unknown operator: {op}"),，推荐阅读新收录的资料获取更多信息