warning: not reporting region error due to -Znll
  --> $DIR/propagate-approximated-val.rs:50:9
   |
50 |         demand_y(outlives1, outlives2, x.get()) //~ WARNING not reporting region error due to -Znll
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

note: External requirements
  --> $DIR/propagate-approximated-val.rs:46:45
   |
46 |       establish_relationships(cell_a, cell_b, |outlives1, outlives2, x, y| {
   |  _____________________________________________^
47 | |         //~^ ERROR lifetime mismatch
48 | |
49 | |         // Only works if 'x: 'y:
50 | |         demand_y(outlives1, outlives2, x.get()) //~ WARNING not reporting region error due to -Znll
51 | |     });
   | |_____^
   |
   = 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 { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 'r)) u32>, std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) &'_#2r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 'r)) u32>, std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) u32>))
           ]
   = note: number of external vids: 3
   = note: where '_#1r: '_#2r

error[E0623]: lifetime mismatch
  --> $DIR/propagate-approximated-val.rs:46:29
   |
45 | fn test<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
   |                              -------                -------
   |                              |
   |                              these two types are declared with different lifetimes...
46 |     establish_relationships(cell_a, cell_b, |outlives1, outlives2, x, y| {
   |                             ^^^^^^ ...but data from `cell_a` flows into `cell_b` here

note: No external requirements
  --> $DIR/propagate-approximated-val.rs:45:1
   |
45 | / fn test<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
46 | |     establish_relationships(cell_a, cell_b, |outlives1, outlives2, x, y| {
47 | |         //~^ ERROR lifetime mismatch
48 | |
...  |
51 | |     });
52 | | }
   | |_^
   |
   = note: defining type: DefId(0/0:6 ~ propagate_approximated_val[317d]::test[0]) with substs []

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0623"