1 error[E0597]: `books` does not live long enough
2 --> $DIR/borrowck-escaping-closure-error-2.rs:21:17
4 LL | Box::new(|| books.push(4))
5 | -- ^^^^^ borrowed value does not live long enough
10 | - `books` dropped here while still borrowed
12 note: borrowed value must be valid for the lifetime 'a as defined on the function body at 19:8...
13 --> $DIR/borrowck-escaping-closure-error-2.rs:19:8
15 LL | fn foo<'a>(x: &'a i32) -> Box<FnMut()+'a> {
18 error: aborting due to previous error
20 For more information about this error, try `rustc --explain E0597`.