| error: implementation of `FnOnce` is not general enough | |
| --> $DIR/issue-57843.rs:25:9 | |
| | | |
| LL | Foo(Box::new(|_| ())); | |
| | ^^^^^^^^^^^^^^^^ implementation of `FnOnce` is not general enough | |
| | | |
| = note: closure with signature `fn(&'2 bool)` must implement `FnOnce<(&'1 bool,)>`, for any lifetime `'1`... | |
| = note: ...but it actually implements `FnOnce<(&'2 bool,)>`, for some specific lifetime `'2` | |
| error: aborting due to 1 previous error | |