src/test/ui/issues/issue-28498-must-work-ex2.rs

   1 // run-pass
   2 // Example taken from RFC 1238 text
   3
   4 // https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
   5 //     #examples-of-code-that-must-continue-to-work
   6
   7 use std::cell::Cell;
   8
   9 struct Concrete<'a>(#[allow(unused_tuple_struct_fields)] u32, Cell<Option<&'a Concrete<'a>>>);
  10
  11 struct Foo<T> { data: Vec<T> }
  12
  13 fn main() {
  14     let mut foo = Foo {  data: Vec::new() };
  15     foo.data.push(Concrete(0, Cell::new(None)));
  16     foo.data.push(Concrete(0, Cell::new(None)));
  17
  18     foo.data[0].1.set(Some(&foo.data[1]));
  19     foo.data[1].1.set(Some(&foo.data[0]));
  20 }