1 // Test that we give a custom error (E0373) for the case where a
2 // closure is escaping current frame, and offer a suggested code edit.
3 // I refrained from including the precise message here, but the
4 // original text as of the time of this writing is:
6 // closure may outlive the current function, but it borrows `books`,
7 // which is owned by the current function
9 fn foo<'a>(x: &'a i32) -> Box<dyn FnMut() + 'a> {
10 let mut books = vec![1,2,3];
11 Box::new(|| books.push(4))