]>
Commit | Line | Data |
---|---|---|
b039eaaf SL |
1 | // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // Example taken from RFC 1238 text | |
12 | ||
13 | // https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md | |
14 | // #examples-of-code-that-will-start-to-be-rejected | |
15 | ||
16 | // Compare against test/run-pass/issue28498-must-work-ex2.rs | |
17 | ||
18 | use std::cell::Cell; | |
19 | ||
20 | struct Concrete<'a>(u32, Cell<Option<&'a Concrete<'a>>>); | |
21 | ||
22 | struct Foo<T> { data: Vec<T> } | |
23 | ||
24 | fn potentially_specialized_wrt_t<T>(t: &T) { | |
25 | // Hypothetical code that does one thing for generic T and then is | |
26 | // specialized for T == Concrete (and the specialized form can | |
27 | // then access a reference held in concrete tuple). | |
28 | // | |
29 | // (We don't have specialization yet, but we want to allow for it | |
30 | // in the future.) | |
31 | } | |
32 | ||
33 | impl<T> Drop for Foo<T> { | |
34 | fn drop(&mut self) { | |
35 | potentially_specialized_wrt_t(&self.data[0]) | |
36 | } | |
37 | } | |
38 | ||
39 | fn main() { | |
40 | let mut foo = Foo { data: Vec::new() }; | |
41 | foo.data.push(Concrete(0, Cell::new(None))); | |
42 | foo.data.push(Concrete(0, Cell::new(None))); | |
43 | ||
44 | foo.data[0].1.set(Some(&foo.data[1])); | |
45 | //~^ ERROR `foo.data` does not live long enough | |
46 | foo.data[1].1.set(Some(&foo.data[0])); | |
47 | //~^ ERROR `foo.data` does not live long enough | |
48 | } |