note: no external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:21:15
   |
LL |     foo(cell, |cell_a, cell_x| {
   |               ^^^^^^^^^^^^^^^^
   |
   = note: defining type: case1::{closure#0} with closure substs [
               i32,
               for<Region(BrAnon(None))> extern "rust-call" fn((std::cell::Cell<&'?1 u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon(None) }) u32>)),
               (),
           ]

error[E0521]: borrowed data escapes outside of closure
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:22:9
   |
LL |     foo(cell, |cell_a, cell_x| {
   |                ------  ------ `cell_x` is a reference that is only valid in the closure body
   |                |
   |                `cell_a` declared here, outside of the closure body
LL |         cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
   |         ^^^^^^^^^^^^^^^^^^^^^^^^ `cell_x` escapes the closure body here

note: no external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:18:1
   |
LL | fn case1() {
   | ^^^^^^^^^^
   |
   = note: defining type: case1

note: external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:35:15
   |
LL |     foo(cell, |cell_a, cell_x| {
   |               ^^^^^^^^^^^^^^^^
   |
   = note: defining type: case2::{closure#0} with closure substs [
               i32,
               for<Region(BrAnon(None))> extern "rust-call" fn((std::cell::Cell<&'?1 u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon(None) }) u32>)),
               (),
           ]
   = note: number of external vids: 2
   = note: where '?1: '?0

note: no external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:28:1
   |
LL | fn case2() {
   | ^^^^^^^^^^
   |
   = note: defining type: case2

error[E0597]: `a` does not live long enough
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:30:26
   |
LL |       let a = 0;
   |           - binding `a` declared here
LL |       let cell = Cell::new(&a);
   |                            ^^ borrowed value does not live long enough
...
LL | /     foo(cell, |cell_a, cell_x| {
LL | |         cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error
LL | |     })
   | |______- argument requires that `a` is borrowed for `'static`
LL |   }
   |   - `a` dropped here while still borrowed

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0521, E0597.
For more information about an error, try `rustc --explain E0521`.