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,)) -> std::boxed::Box<(dyn Anything + '?2)>, (), ] = note: number of external vids: 3 = note: where ::Item: '?2 note: no external requirements --> $DIR/projection-no-regions-closure.rs:21:1 | LL | / fn no_region<'a, T>(x: Box) -> Box LL | | where LL | | T: Iterator, | |________________^ | = note: defining type: no_region::<'?1, T> error[E0309]: the associated type `::Item` may not live long enough --> $DIR/projection-no-regions-closure.rs:25:31 | LL | fn no_region<'a, T>(x: Box) -> Box | -- the associated type `::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 `::Item` will meet its required lifetime bounds | help: consider adding an explicit lifetime bound | LL | T: 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,)) -> std::boxed::Box<(dyn Anything + '?2)>, (), ] = note: number of external vids: 3 = note: where ::Item: '?2 note: no external requirements --> $DIR/projection-no-regions-closure.rs:30:1 | LL | / fn correct_region<'a, T>(x: Box) -> Box 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,)) -> std::boxed::Box<(dyn Anything + '?3)>, (), ] = note: number of external vids: 4 = note: where ::Item: '?3 note: no external requirements --> $DIR/projection-no-regions-closure.rs:38:1 | LL | / fn wrong_region<'a, 'b, T>(x: Box) -> Box LL | | where LL | | T: 'b + Iterator, | |_____________________^ | = note: defining type: wrong_region::<'?1, '?2, T> error[E0309]: the associated type `::Item` may not live long enough --> $DIR/projection-no-regions-closure.rs:42:31 | LL | fn wrong_region<'a, 'b, T>(x: Box) -> Box | -- the associated type `::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 `::Item` will meet its required lifetime bounds | help: consider adding an explicit lifetime bound | LL | T: 'b + 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,)) -> std::boxed::Box<(dyn Anything + '?3)>, (), ] = note: number of external vids: 4 = note: where ::Item: '?3 note: no external requirements --> $DIR/projection-no-regions-closure.rs:47:1 | LL | / fn outlives_region<'a, 'b, T>(x: Box) -> Box 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`.