error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
  --> tests/compile_fail/circular.rs:21:40
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined here...
  --> tests/compile_fail/circular.rs:21:69
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                                                     ^^^^^
note: ...so that the type `Bar<'_>` is not borrowed for too long
  --> tests/compile_fail/circular.rs:21:45
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: but, the lifetime must be valid for the anonymous lifetime #1 defined here...
  --> tests/compile_fail/circular.rs:20:29
   |
20 |       selfie.with_referential(|referential| {
   |  _____________________________^
21 | |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
22 | |     });
   | |_____^
note: ...so that the expression is assignable
  --> tests/compile_fail/circular.rs:21:40
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = note: expected `Option<&Bar<'_>>`
              found `Option<&Bar<'_>>`

error[E0308]: mismatched types
  --> tests/compile_fail/circular.rs:21:45
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
   |
   = note: expected reference `&Bar<'_>`
              found reference `&Bar<'_>`
note: the anonymous lifetime #1 defined here...
  --> tests/compile_fail/circular.rs:21:69
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                                                     ^^^^^
note: ...does not necessarily outlive the anonymous lifetime #1 defined here
  --> tests/compile_fail/circular.rs:20:29
   |
20 |       selfie.with_referential(|referential| {
   |  _____________________________^
21 | |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
22 | |     });
   | |_____^

error[E0308]: mismatched types
  --> tests/compile_fail/circular.rs:21:45
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime mismatch
   |
   = note: expected reference `&Bar<'_>`
              found reference `&Bar<'_>`
note: the anonymous lifetime #1 defined here...
  --> tests/compile_fail/circular.rs:20:29
   |
20 |       selfie.with_referential(|referential| {
   |  _____________________________^
21 | |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
22 | |     });
   | |_____^
note: ...does not necessarily outlive the anonymous lifetime #1 defined here
  --> tests/compile_fail/circular.rs:21:69
   |
21 |         referential.0.borrow_mut().0 = Some(selfie.with_referential(|r| r));
   |                                                                     ^^^^^