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