40 lines
943 B
Rust
40 lines
943 B
Rust
|
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
|
||
|
|
// file at the top-level directory of this distribution and at
|
||
|
|
// http://rust-lang.org/COPYRIGHT.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||
|
|
// option. This file may not be copied, modified, or distributed
|
||
|
|
// except according to those terms.
|
||
|
|
|
||
|
|
use std::cell::Cell;
|
||
|
|
|
||
|
|
#[derive(Show)]
|
||
|
|
struct B<'a> {
|
||
|
|
a: [Cell<Option<&'a B<'a>>>; 2]
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'a> B<'a> {
|
||
|
|
fn new() -> B<'a> {
|
||
|
|
B { a: [Cell::new(None), Cell::new(None)] }
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn f() {
|
||
|
|
let (b1, b2, b3);
|
||
|
|
b1 = B::new();
|
||
|
|
b2 = B::new();
|
||
|
|
b3 = B::new();
|
||
|
|
b1.a[0].set(Some(&b2));
|
||
|
|
b1.a[1].set(Some(&b3));
|
||
|
|
b2.a[0].set(Some(&b2));
|
||
|
|
b2.a[1].set(Some(&b3));
|
||
|
|
b3.a[0].set(Some(&b1));
|
||
|
|
b3.a[1].set(Some(&b2));
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
f();
|
||
|
|
}
|