预期的具体寿命，在存储闭包时找到绑定的寿命参数

Question

我想存储一个回调/闭包，但是当我尝试以下简化代码时：

trait Stream<F> {
    fn set_cb(&mut self, f: F)
        where F: Fn(&Stream<F>);
}

pub struct SomeStream<F> {
    cb: Option<F>,
}

impl<F> Stream<F> for SomeStream<F> {
    fn set_cb(&mut self, f: F)
        where F: Fn(&Stream<F>)
    {
        self.cb = Some(f)
    }
}

fn main() {
    let ss = SomeStream { cb: None };
    let cb = |stream| {};
    ss.set_cb(cb);
}

我收到以下错误：

error: type mismatch resolving `for<'r> <[closure] as core::ops::FnOnce<(&'r Stream<[closure]> + 'r,)>>::Output == ()`:
 expected bound lifetime parameter ,
    found concrete lifetime [E0271]
         ss.set_cb(cb);
            ^~~~~~
help: see the detailed explanation for E0271

error: type mismatch: the type `[closure]` implements the trait `core::ops::Fn<(_,)>`, but the trait `for<'r> core::ops::Fn<(&'r Stream<[closure]> + 'r,)>` is required (expected concrete lifetime, found bound lifetime parameter ) [E0281]
         ss.set_cb(cb);
            ^~~~~~

我没有指定任何生命周期参数。这里有什么问题？我应该用Box包裹封口吗？