Rust 打印 `format_args！` 时borrow 时临时值丢失

(有一百万个问题有类似的标题，但我认为这个问题与所有问题都不同.)

铁 rust 版本:1.69.0.

以下内容的工作方式与预期一致:

fn main() {
    println!("{}", format_args!("hello {}", "world"));
}

但borrow 判断器会阻止编译以下代码.

fn main() {
    let args = format_args!("hello {}", "world");
    println!("{}", args);
}

错误:

error[E0716]: temporary value dropped while borrowed
 --> src/main.rs:2:16
  |
2 |     let args = format_args!("hello {}", "world");
  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- temporary value is freed at the end of this statement
  |                |
  |                creates a temporary value which is freed while still in use
3 |     println!("{}", args);
  |                    ---- borrow later used here
  |
  = note: this error originates in the macro `format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider using a `let` binding to create a longer lived value
  |
2 ~     let binding = format_args!("hello {}", "world");
3 ~     let args = binding;
  |

我看不到任何违反Rust借入规则的行为--据我所知，一切都在作用域内，绑定到一个变量，没有过早丢弃等等.fmt::Arguments<'a>有一个生存期参数，但不清楚它试图保留哪些数据正在被丢弃.此外，帮助信息显然是虚假的(args的生命周期 与binding的生命周期 一样长！).