| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Tests that we consider `Box<U>: !Sugar` to be ambiguous, even |
| // though we see no impl of `Sugar` for `Box`. Therefore, an overlap |
| // error is reported for the following pair of impls (#23516). |
| |
| pub trait Sugar {} |
| |
| struct Cake<X>(X); |
| |
| impl<T:Sugar> Cake<T> { fn dummy(&self) { } } |
| //~^ ERROR E0592 |
| impl<U:Sugar> Cake<Box<U>> { fn dummy(&self) { } } |
| |
| fn main() { } |
