error: lifetime may not live long enough --> $DIR/mir_check_cast_unsize.rs:6:5 | LL | fn bar<'a>(x: &'a u32) -> &'static dyn Debug { | -- lifetime `'a` defined here LL | x | ^ returning this value requires that `'a` must outlive `'static` | help: to declare that the trait object captures data from argument `x`, you can add an explicit `'a` lifetime bound | LL | fn bar<'a>(x: &'a u32) -> &'static dyn Debug + 'a { | ++++ error: aborting due to 1 previous error