note: External requirements
  --> $DIR/propagate-approximated-val.rs:46:45
   |
LL |       establish_relationships(cell_a, cell_b, |outlives1, outlives2, x, y| {
   |  _____________________________________________^
LL | |
LL | |         // Only works if 'x: 'y:
LL | |         demand_y(outlives1, outlives2, x.get())
LL | |         //~^ ERROR unsatisfied lifetime constraints
LL | |     });
   | |_____^
   |
   = note: defining type: DefId(0/1:18 ~ propagate_approximated_val[317d]::test[0]::{{closure}}[0]) with closure substs [
               i16,
               for<'r, 's> extern "rust-call" fn((std::cell::Cell<&'_#1r &ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 'r)) u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 's)) &'_#2r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 'r)) u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 's)) u32>))
           ]
   = note: late-bound region is '_#3r
   = note: late-bound region is '_#4r
   = note: number of external vids: 5
   = note: where '_#1r: '_#2r

note: No external requirements
  --> $DIR/propagate-approximated-val.rs:45:1
   |
LL | / fn test<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
LL | |     establish_relationships(cell_a, cell_b, |outlives1, outlives2, x, y| {
LL | |
LL | |         // Only works if 'x: 'y:
...  |
LL | |     });
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:6 ~ propagate_approximated_val[317d]::test[0]) with substs []

error: unsatisfied lifetime constraints
  --> $DIR/propagate-approximated-val.rs:49:9
   |
LL | fn test<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
   |         --  -- lifetime `'b` defined here
   |         |
   |         lifetime `'a` defined here
...
LL |         demand_y(outlives1, outlives2, x.get())
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ argument requires that `'a` must outlive `'b`

error: aborting due to previous error