rust/tests/ui/nll/closure-requirements/propagate-approximated-ref.stderr

note: external requirements
  --> $DIR/propagate-approximated-ref.rs:43:47
   |
LL |     establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: defining type: supply::{closure#0} with closure args [
               i16,
               for<Region(BrAnon), Region(BrAnon), Region(BrAnon), Region(BrAnon), Region(BrAnon), Region(BrAnon)> extern "rust-call" fn((&'^0 std::cell::Cell<&'?1 &'^1 u32>, &'^2 std::cell::Cell<&'^3 &'?2 u32>, &'^4 std::cell::Cell<&'^1 u32>, &'^5 std::cell::Cell<&'^3 u32>)),
               (),
           ]
   = note: late-bound region is '?3
   = note: late-bound region is '?4
   = note: number of external vids: 5
   = note: where '?1: '?2

note: no external requirements
  --> $DIR/propagate-approximated-ref.rs:42:1
   |
LL | fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: defining type: supply

error: lifetime may not live long enough
  --> $DIR/propagate-approximated-ref.rs:43:5
   |
LL |   fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
   |             --  -- lifetime `'b` defined here
   |             |
   |             lifetime `'a` defined here
LL | /     establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
...  |
LL | |     });
   | |______^ argument requires that `'a` must outlive `'b`
   |
   = help: consider adding the following bound: `'a: 'b`
   = note: requirement occurs because of the type `Cell<&'?11 u32>`, which makes the generic argument `&'?11 u32` invariant
   = note: the struct `Cell<T>` is invariant over the parameter `T`
   = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance

error: aborting due to 1 previous error