mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
16 lines
421 B
Rust
16 lines
421 B
Rust
fn main() {
|
|
let mut x: Option<isize> = None;
|
|
match x {
|
|
None => {
|
|
// Note: on this branch, no borrow has occurred.
|
|
x = Some(0);
|
|
}
|
|
Some(ref i) => {
|
|
// But on this branch, `i` is an outstanding borrow
|
|
x = Some(*i+1); //~ ERROR cannot assign to `x` because it is borrowed
|
|
drop(i);
|
|
}
|
|
}
|
|
x.clone(); // just to prevent liveness warnings
|
|
}
|