note: external requirements
  --> $DIR/propagate-despite-same-free-region.rs:42:9
   |
LL |         |_outlives1, _outlives2, x, y| {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: defining type: supply::{closure#0} with closure args [
               i16,
               for<Region(BrAnon), Region(BrAnon)> extern "rust-call" fn((std::cell::Cell<&'?1 &ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon }) u32>, std::cell::Cell<&ReBound(DebruijnIndex(0), BoundRegion { var: 1, kind: BrAnon }) &'?2 u32>, std::cell::Cell<&ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon }) u32>, std::cell::Cell<&ReBound(DebruijnIndex(0), BoundRegion { var: 1, kind: BrAnon }) u32>)),
               (),
           ]
   = note: late-bound region is '?3
   = note: number of external vids: 4
   = note: where '?1: '?2

note: no external requirements
  --> $DIR/propagate-despite-same-free-region.rs:39:1
   |
LL | fn supply<'a>(cell_a: Cell<&'a u32>) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: defining type: supply