Macro std::format_args_nl

macro_rules! format_args_nl {
    ($fmt:expr) => { ... };
    ($fmt:expr, $($args:tt)*) => { ... };
}

🔬 This is a nightly-only experimental API. (format_args_nl)

format_args_nl is only for internal language use and is subject to change

与 format_args 相同，但最后添加一个换行符。