note: external requirements
  --> $DIR/projection-no-regions-closure.rs:25:23
   |
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                       ^^^^^^^
   |
   = note: defining type: no_region::<'?1, T>::{closure#0} with closure args [
               i32,
               extern "rust-call" fn((std::boxed::Box<T>,)) -> std::boxed::Box<(dyn Anything + '?2)>,
               (),
           ]
   = note: number of external vids: 3
   = note: where <T as std::iter::Iterator>::Item: '?2

note: no external requirements
  --> $DIR/projection-no-regions-closure.rs:21:1
   |
LL | / fn no_region<'a, T>(x: Box<T>) -> Box<dyn Anything + 'a>
LL | | where
LL | |     T: Iterator,
   | |________________^
   |
   = note: defining type: no_region::<'?1, T>

error[E0309]: the associated type `<T as Iterator>::Item` may not live long enough
  --> $DIR/projection-no-regions-closure.rs:25:31
   |
LL | fn no_region<'a, T>(x: Box<T>) -> Box<dyn Anything + 'a>
   |              -- the associated type `<T as Iterator>::Item` must be valid for the lifetime `'a` as defined here...
...
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                               ^^^^^^^^^^^^^^^^^^ ...so that the type `<T as Iterator>::Item` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     T: Iterator, <T as Iterator>::Item: 'a
   |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~

note: external requirements
  --> $DIR/projection-no-regions-closure.rs:34:23
   |
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                       ^^^^^^^
   |
   = note: defining type: correct_region::<'?1, T>::{closure#0} with closure args [
               i32,
               extern "rust-call" fn((std::boxed::Box<T>,)) -> std::boxed::Box<(dyn Anything + '?2)>,
               (),
           ]
   = note: number of external vids: 3
   = note: where <T as std::iter::Iterator>::Item: '?2

note: no external requirements
  --> $DIR/projection-no-regions-closure.rs:30:1
   |
LL | / fn correct_region<'a, T>(x: Box<T>) -> Box<dyn Anything + 'a>
LL | | where
LL | |     T: 'a + Iterator,
   | |_____________________^
   |
   = note: defining type: correct_region::<'?1, T>

note: external requirements
  --> $DIR/projection-no-regions-closure.rs:42:23
   |
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                       ^^^^^^^
   |
   = note: defining type: wrong_region::<'?1, '?2, T>::{closure#0} with closure args [
               i32,
               extern "rust-call" fn((std::boxed::Box<T>,)) -> std::boxed::Box<(dyn Anything + '?3)>,
               (),
           ]
   = note: number of external vids: 4
   = note: where <T as std::iter::Iterator>::Item: '?3

note: no external requirements
  --> $DIR/projection-no-regions-closure.rs:38:1
   |
LL | / fn wrong_region<'a, 'b, T>(x: Box<T>) -> Box<dyn Anything + 'a>
LL | | where
LL | |     T: 'b + Iterator,
   | |_____________________^
   |
   = note: defining type: wrong_region::<'?1, '?2, T>

error[E0309]: the associated type `<T as Iterator>::Item` may not live long enough
  --> $DIR/projection-no-regions-closure.rs:42:31
   |
LL | fn wrong_region<'a, 'b, T>(x: Box<T>) -> Box<dyn Anything + 'a>
   |                 -- the associated type `<T as Iterator>::Item` must be valid for the lifetime `'a` as defined here...
...
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                               ^^^^^^^^^^^^^^^^^^ ...so that the type `<T as Iterator>::Item` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     T: 'b + Iterator, <T as Iterator>::Item: 'a
   |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~

note: external requirements
  --> $DIR/projection-no-regions-closure.rs:52:23
   |
LL |     with_signature(x, |mut y| Box::new(y.next()))
   |                       ^^^^^^^
   |
   = note: defining type: outlives_region::<'?1, '?2, T>::{closure#0} with closure args [
               i32,
               extern "rust-call" fn((std::boxed::Box<T>,)) -> std::boxed::Box<(dyn Anything + '?3)>,
               (),
           ]
   = note: number of external vids: 4
   = note: where <T as std::iter::Iterator>::Item: '?3

note: no external requirements
  --> $DIR/projection-no-regions-closure.rs:47:1
   |
LL | / fn outlives_region<'a, 'b, T>(x: Box<T>) -> Box<dyn Anything + 'a>
LL | | where
LL | |     T: 'b + Iterator,
LL | |     'b: 'a,
   | |___________^
   |
   = note: defining type: outlives_region::<'?1, '?2, T>

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0309`.