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7453a54e | 1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
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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 | ||
b7449926 | 11 | // run-pass |
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12 | trait Future: 'static { |
13 | // The requirement for Self: Sized must prevent instantiation of | |
14 | // Future::forget in vtables, otherwise there's an infinite type | |
15 | // recursion through <Map<...> as Future>::forget. | |
16 | fn forget(self) where Self: Sized { | |
17 | Box::new(Map(self)) as Box<Future>; | |
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18 | } |
19 | } | |
20 | ||
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21 | struct Map<A>(A); |
22 | impl<A: Future> Future for Map<A> {} | |
23 | ||
24 | pub struct Promise; | |
25 | impl Future for Promise {} | |
26 | ||
27 | fn main() { | |
28 | Promise.forget(); | |
223e47cc | 29 | } |