| //@ revisions: edition2021 edition2024 | |
| //@ [edition2021] edition: 2021 | |
| //@ [edition2024] edition: 2024 | |
| //@ [edition2024] compile-flags: -Zunstable-options | |
| //@ [edition2024] check-pass | |
| #![cfg_attr(edition2024, feature(shorter_tail_lifetimes))] | |
| fn main() { | |
| let cell = std::cell::RefCell::new(0u8); | |
| if let Ok(mut byte) = cell.try_borrow_mut() { | |
| //[edition2021]~^ ERROR: `cell` does not live long enough | |
| *byte = 1; | |
| } | |
| } |