| //@ revisions: edition2021 edition2024 | |
| //@ [edition2024] compile-flags: -Zunstable-options | |
| //@ [edition2024] edition: 2024 | |
| //@ [edition2021] check-pass | |
| fn why_would_you_do_this() -> bool { | |
| let mut x = None; | |
| // Make a temporary `RefCell` and put a `Ref` that borrows it in `x`. | |
| x.replace(std::cell::RefCell::new(123).borrow()).is_some() | |
| //[edition2024]~^ ERROR: temporary value dropped while borrowed | |
| } | |
| fn main() { | |
| why_would_you_do_this(); | |
| } |