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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 // Tests that we consider `Box<U>: !Sugar` to be ambiguous, even
12 // though we see no impl of `Sugar` for `Box`. Therefore, an overlap
13 // error is reported for the following pair of impls (#23516).
14
15 pub trait Sugar {}
16
17 struct Cake<X>(X);
18
19 impl<T:Sugar> Cake<T> { fn dummy(&self) { } }
20 //~^ ERROR E0592
21 impl<U:Sugar> Cake<Box<U>> { fn dummy(&self) { } }
22
23 fn main() { }