1 // Copyright 2017 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.
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.
11 #![feature(conservative_impl_trait)]
15 fn foo() -> Box<impl fmt::Debug+?Sized> {
16 let x : Box<[u8]> = Box::new([0]);
19 fn bar() -> Box<impl fmt::Debug+?Sized> {
20 let y: Box<fmt::Debug> = Box::new([0]);
28 // this is an `*mut [u8]` in practice
29 let f_raw : *mut _ = Box::into_raw(f);
30 // this is an `*mut fmt::Debug` in practice
31 let mut b_raw = Box::into_raw(b);
32 // ... and they should not be mixable
33 b_raw = f_raw as *mut _; //~ ERROR is invalid