| // run-pass |
| // needs-unwind |
| |
| // See `mir_drop_order.rs` for more information |
| |
| #![feature(let_chains)] |
| #![allow(irrefutable_let_patterns)] |
| |
| use std::cell::RefCell; |
| use std::panic; |
| |
| pub struct DropLogger<'a, T> { |
| extra: T, |
| id: usize, |
| log: &'a panic::AssertUnwindSafe<RefCell<Vec<usize>>>, |
| } |
| |
| impl<'a, T> Drop for DropLogger<'a, T> { |
| fn drop(&mut self) { |
| self.log.0.borrow_mut().push(self.id); |
| } |
| } |
| |
| struct InjectedFailure; |
| |
| #[allow(unreachable_code)] |
| fn main() { |
| let log = panic::AssertUnwindSafe(RefCell::new(vec![])); |
| let d = |id, extra| DropLogger { extra, id: id, log: &log }; |
| let get = || -> Vec<_> { |
| let mut m = log.0.borrow_mut(); |
| let n = m.drain(..); |
| n.collect() |
| }; |
| |
| { |
| let _x = ( |
| d( |
| 0, |
| d( |
| 1, |
| if let Some(_) = d(2, Some(true)).extra && let DropLogger { .. } = d(3, None) { |
| None |
| } else { |
| Some(true) |
| } |
| ).extra |
| ), |
| d(4, None), |
| &d(5, None), |
| d(6, None), |
| if let DropLogger { .. } = d(7, None) && let DropLogger { .. } = d(8, None) { |
| d(9, None) |
| } |
| else { |
| // 10 is not constructed |
| d(10, None) |
| }, |
| ); |
| assert_eq!(get(), vec![8, 7, 1, 3, 2]); |
| } |
| assert_eq!(get(), vec![0, 4, 6, 9, 5]); |
| |
| let _ = std::panic::catch_unwind(|| { |
| ( |
| d( |
| 11, |
| d( |
| 12, |
| if let Some(_) = d(13, Some(true)).extra |
| && let DropLogger { .. } = d(14, None) |
| { |
| None |
| } else { |
| Some(true) |
| } |
| ).extra |
| ), |
| d(15, None), |
| &d(16, None), |
| d(17, None), |
| if let DropLogger { .. } = d(18, None) && let DropLogger { .. } = d(19, None) { |
| d(20, None) |
| } |
| else { |
| // 10 is not constructed |
| d(21, None) |
| }, |
| panic::panic_any(InjectedFailure) |
| ); |
| }); |
| assert_eq!(get(), vec![20, 17, 15, 11, 19, 18, 16, 12, 14, 13]); |
| } |