35 lines
876 B
Rust
35 lines
876 B
Rust
//@ edition:2021
|
|
|
|
#![feature(rustc_attrs)]
|
|
#![allow(unused)]
|
|
|
|
struct Point {
|
|
x: i32,
|
|
y: i32,
|
|
}
|
|
struct Wrapper {
|
|
p: Point,
|
|
}
|
|
|
|
fn main() {
|
|
let mut w = Wrapper { p: Point { x: 10, y: 10 } };
|
|
|
|
let c = #[rustc_capture_analysis]
|
|
//~^ ERROR: attributes on expressions are experimental
|
|
//~| NOTE: see issue #15701 <https://github.com/rust-lang/rust/issues/15701>
|
|
//~| NOTE: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
|
|
|| {
|
|
//~^ ERROR: First Pass analysis includes:
|
|
//~| ERROR: Min Capture analysis includes:
|
|
println!("{}", w.p.x);
|
|
//~^ NOTE: Capturing w[(0, 0),(0, 0)] -> Immutable
|
|
//~| NOTE: Min Capture w[(0, 0),(0, 0)] -> Immutable
|
|
};
|
|
|
|
// `c` only captures `w.p.x`, therefore it's safe to mutate `w.p.y`.
|
|
let py = &mut w.p.y;
|
|
c();
|
|
|
|
*py = 20
|
|
}
|