小编End*_*del的帖子

我正在尝试使用a返回错误结果&'static str.

impl Worker {
    fn get_task_by_name(&self, name: String) -> Result<Box<Task>, &'static str> {
        Err("Task not found!");
    }
}

它输出以下错误:

src/lib.rs:84:5: 84:8 error: unable to infer enough type information about `_`; type annotations or generic parameter binding required [E0282]
src/lib.rs:84     Err("Task not found!");
                  ^~~

这可能是什么问题？