error[E0521]: borrowed data escapes outside of function
  --> $DIR/lifetime-bound-will-change-warning.rs:34:5
   |
LL | fn test2<'a>(x: &'a Box<dyn Fn() + 'a>) {
   |          --  - `x` is a reference that is only valid in the function body
   |          |
   |          lifetime `'a` defined here
LL |     // but ref_obj will not, so warn.
LL |     ref_obj(x)
   |     ^^^^^^^^^^
   |     |
   |     `x` escapes the function body here
   |     argument requires that `'a` must outlive `'static`

error[E0521]: borrowed data escapes outside of function
  --> $DIR/lifetime-bound-will-change-warning.rs:40:5
   |
LL | fn test2cc<'a>(x: &'a Box<dyn Fn() + 'a>) {
   |            --  - `x` is a reference that is only valid in the function body
   |            |
   |            lifetime `'a` defined here
LL |     // same as test2, but cross crate
LL |     lib::ref_obj(x)
   |     ^^^^^^^^^^^^^^^
   |     |
   |     `x` escapes the function body here
   |     argument requires that `'a` must outlive `'static`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0521`.