trait Run{
    fn run(&self,name:String,speed:u64) -> String;
}

impl <T>Run for T
    where T:Fn(String) -> String
{
    fn run(&self,name:String,_:u64) -> String{
        self(name)
    }
}

fn unknown_speed(name:String) -> String{
    format!("{} 's speed is unknown",name)
}

fn main(){
    let runner1:&dyn Run=&unknown_speed;
    let result1=runner1.run("rabbit".to_string(),0);
    println!("{}",result1);
}

这段代码可以正常运行。

trait Run{
    fn run(&self,name:String,speed:u64) -> String;
}

impl <T>Run for T
    where T:Fn(String) -> String
{
    fn run(&self,name:String,_:u64) -> String{
        self(name)
    }
}

impl <T>Run for T
    where T:Fn(String,u64) -> String
{
    fn run(&self,name:String,speed:u64) -> String{
        self(name,speed)
    }
}

fn unknown_speed(name:String) -> String{
    format!("{} 's speed is unknown",name)
}

fn with_speed(name:String,speed:u64) -> String{
    format!("{} 's speed is {}",name,speed)
}

fn main(){
    let runner1:&dyn Run=&unknown_speed;
    let result1=runner1.run("rabbit".to_string(),0);
    
    let runner2:&dyn Run=&with_speed;
    let result2=runner2.run("dog".to_string(),100);

    println!("{}",result1);
    println!("{}",result2);

}

这段代码无法运行

error[E0119]: conflicting implementations of trait `Run`:
  --> src/main.rs:13:1
   |
5  | / impl <T>Run for T
6  | |     where T:Fn(String) -> String
7  | | {
8  | |     fn run(&self,name:String,_:u64) -> String{
9  | |         self(name)
10 | |     }
11 | | }
   | |_- first implementation here
12 | 
13 | / impl <T>Run for T
14 | |     where T:Fn(String,u64) -> String
15 | | {
16 | |     fn run(&self,name:String,speed:u64) -> String{
17 | |         self(name,speed)
18 | |     }
19 | | }
   | |_^ conflicting implementation

一个函数不可能既实现Fn(String)，又实现Fn(String,u64)，两个trait实现根本不冲突！如何解决这个问题？

问题代码playground链接：

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=11cc0cbf3dba66b9bf27fb96466ad1c7