warning: not reporting region error due to nll
  --> $DIR/mir_check_cast_unsafe_fn.rs:18:32
   |
LL |     let g: unsafe fn(_) -> _ = f;
   |                                ^

error: borrowed data escapes outside of function
  --> $DIR/mir_check_cast_unsafe_fn.rs:20:14
   |
LL | fn bar<'a>(input: &'a u32, f: fn(&'a u32) -> &'a u32) -> &'static u32 {
   |            ----- `input` is a reference that is only valid in the function body
...
LL |     unsafe { g(input) }
   |              ^^^^^^^^ `input` escapes the function body here

error: aborting due to previous error