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[rustc.git] / src / test / compile-fail / coherence-overlap-issue-23516.rs
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1a4d82fc 1// Copyright 2015 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
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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).
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15pub trait Sugar { fn dummy(&self) { } }
16pub trait Sweet { fn dummy(&self) { } }
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17impl<T:Sugar> Sweet for T { }
18impl<U:Sugar> Sweet for Box<U> { } //~ ERROR E0119
223e47cc 19fn main() { }