error[E0582]: binding for associated type `Output` references lifetime `'c`, which does not appear in the trait input types --> $DIR/issue-49919.rs:2:39 | LL | let foo: Box Fn() -> &'c T> = Box::new(move || &t); | ^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0582`.