error: lifetime may not live long enough --> $DIR/issue-10291.rs:3:9 | LL | fn test<'x>(x: &'x isize) { | -- lifetime `'x` defined here LL | drop::<Box<dyn for<'z> FnMut(&'z isize) -> &'z isize>>(Box::new(|z| { LL | x | ^ returning this value requires that `'x` must outlive `'static` error: aborting due to previous error