error: lifetime may not live long enough
  --> ui/lockall_lifetime_destruct_field.rs:23:13
   |
22 |         let _ = c.shared.lock(|foo::Shared { a }| {
   |                                ------------------ return type of closure is &'2 mut &mut u32
   |                                |
   |                                has type `&'1 mut __rtic_internal_fooShared<'_>`
23 |             a // lifetime
   |             ^ returning this value requires that `'1` must outlive `'2`