| // 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. |
| |
| // Example taken from RFC 1238 text |
| |
| // https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md |
| // #examples-of-code-that-must-continue-to-work |
| |
| use std::cell::Cell; |
| |
| struct Concrete<'a>(u32, Cell<Option<&'a Concrete<'a>>>); |
| |
| struct Foo<T> { data: Vec<T> } |
| |
| fn main() { |
| let mut foo = Foo { data: Vec::new() }; |
| foo.data.push(Concrete(0, Cell::new(None))); |
| foo.data.push(Concrete(0, Cell::new(None))); |
| |
| foo.data[0].1.set(Some(&foo.data[1])); |
| foo.data[1].1.set(Some(&foo.data[0])); |
| } |
| |
