error: unsatisfied lifetime constraints
  --> $DIR/mir_check_cast_unsafe_fn.rs:18:32
   |
LL | fn bar<'a>(input: &'a u32, f: fn(&'a u32) -> &'a u32) -> &'static u32 {
   |        -- lifetime `'a` defined here
...
LL |     let g: unsafe fn(_) -> _ = f;
   |                                ^ cast requires that `'a` must outlive `'static`

error: aborting due to previous error