相关疑难解决方法(0)

我正在尝试将 args 打印到以下函数：

pub async fn loop_until_hit_rate_limit<'a, T, Fut>(
    object_arr: &'a [T],
    settings: &'a Settings,
    pool: &'a PgPool,
    f: impl Fn(&'a Settings, &'a PgPool, &'a T) -> Fut + Copy,
    rate_limit: usize,
) where
    Fut: Future<Output = anyhow::Result<()>>,
{
    // do stuff
    println!("args were: {}, {}, {}, {}, {}", object_arr, settings, pool, f, rate_limit) // <--- how do I make this work?
}

天真的方法失败并出现以下错误（对于 {}）：

 ^ `impl Fn(&'a Settings, &'a PgPool, &'a T) -> Fut + Copy` cannot be formatted …

Rust 有没有办法获取“调用”函数名称或宏内的任何其他上下文信息？

例子：

#[macro_export]
macro_rules! somemacro {
    ( $x:expr ) => {
        {
          // access function name (etc..) that called this macro
        }
    };
}