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// run-pass
// 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>(#[allow(unused_tuple_struct_fields)] u32, Cell<Option<&'a Concrete<'a>>>);
fn main() {
let mut data = Vec::new();
data.push(Concrete(0, Cell::new(None)));
data.push(Concrete(0, Cell::new(None)));
data[0].1.set(Some(&data[1]));
data[1].1.set(Some(&data[0]));
}
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