error[E0597]: `a` does not live long enough
  --> $DIR/issue-55511.rs:13:28
   |
LL |     let a = 22;
   |         - binding `a` declared here
LL |     let b = Some(Cell::new(&a));
   |                            ^^ borrowed value does not live long enough
...
LL |         <() as Foo<'static>>::C => { }
   |         ----------------------- type annotation requires that `a` is borrowed for `'static`
...
LL | }
   | - `a` dropped here while still borrowed

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0597`.