note: No external requirements
  --> $DIR/return-wrong-bound-region.rs:21:16
   |
LL |     expect_sig(|a, b| b); // ought to return `a`
   |                ^^^^^^^^
   |
   = note: defining type: DefId(0/1:9 ~ return_wrong_bound_region[317d]::test[0]::{{closure}}[0]) with closure substs [
               i16,
               for<'r, 's> extern "rust-call" fn((&ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 'r)) i32, &ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 's)) i32)) -> &ReLateBound(DebruijnIndex(0), BrNamed(crate0:DefIndex(0:0), 'r)) i32
           ]

error: unsatisfied lifetime constraints
  --> $DIR/return-wrong-bound-region.rs:21:23
   |
LL |     expect_sig(|a, b| b); // ought to return `a`
   |                 -  -  ^ closure was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
   |                 |  |
   |                 |  has type `&'1 i32`
   |                 has type `&'2 i32`

note: No external requirements
  --> $DIR/return-wrong-bound-region.rs:20:1
   |
LL | / fn test() {
LL | |     expect_sig(|a, b| b); // ought to return `a`
LL | |     //~^ ERROR
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:3 ~ return_wrong_bound_region[317d]::test[0]) with substs []

error: aborting due to previous error