note: No external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:21:15
   |
LL |       foo(cell, |cell_a, cell_x| {
   |  _______________^
LL | |         cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
LL | |
LL | |     })
   | |_____^
   |
   = note: defining type: case1::{{closure}}#0 with closure substs [
               i32,
               for<'r> extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BrNamed('r)) 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` is 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() {
LL | |     let a = 0;
LL | |     let cell = Cell::new(&a);
LL | |     foo(cell, |cell_a, cell_x| {
...  |
LL | |     })
LL | | }
   | |_^
   |
   = 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| {
   |  _______________^
LL | |         cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error
LL | |     })
   | |_____^
   |
   = note: defining type: case2::{{closure}}#0 with closure substs [
               i32,
               for<'r> extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BrNamed('r)) u32>)),
           ]
   = note: number of external vids: 2
   = note: where '_#1r: '_#0r

note: No external requirements
  --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:28:1
   |
LL | / fn case2() {
LL | |     let a = 0;
LL | |     let cell = Cell::new(&a);
LL | |
...  |
LL | |     })
LL | | }
   | |_^
   |
   = 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 cell = Cell::new(&a);
   |                ----------^^-
   |                |         |
   |                |         borrowed value does not live long enough
   |                argument requires that `a` is borrowed for `'static`
...
LL | }
   | - `a` dropped here while still borrowed

error: aborting due to 2 previous errors

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