可以使用async_trait的时候，方法参数类型是静态的，因此与动态分派可能会有一些限制。但是你可以使用Box来传递实现了SomeTrait的类型。这使得动态派发更容易，而async_trait仍然可以处理异步性。

下面是代码示例：

use async_trait::async_trait;

trait SomeTrait {
    async fn do_something(&self);
}

struct A;

#[async_trait]
impl SomeTrait for A {
    async fn do_something(&self) {
        println!("A is doing something");
    }
}

struct B;

#[async_trait]
impl SomeTrait for B {
    async fn do_something(&self) {
        println!("B is doing something");
    }
}

#[async_trait]
trait SomeOtherTrait {
    async fn call_do_something(&self, thing: &dyn SomeTrait);
}

struct C;

#[async_trait]
impl SomeOtherTrait for C {
    async fn call_do_something(&self, thing: &dyn SomeTrait) {
        thing.do_something().await;
    }
}

#[tokio::main]
async fn main() {
    let a = A {};
    let b = B {};

    let c = C {};

    c.call_do_something(&a).await;
    c.call_do_something(&b).await;
}