| // Copyright 2016 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. |
| |
| // Test if the on_unimplemented message override works |
| |
| #![feature(on_unimplemented)] |
| #![feature(rustc_attrs)] |
| |
| #[rustc_on_unimplemented = "invalid"] |
| trait Index<Idx: ?Sized> { |
| type Output: ?Sized; |
| fn index(&self, index: Idx) -> &Self::Output; |
| } |
| |
| #[rustc_on_unimplemented = "a usize is required to index into a slice"] |
| impl Index<usize> for [i32] { |
| type Output = i32; |
| fn index(&self, index: usize) -> &i32 { |
| &self[index] |
| } |
| } |
| |
| #[rustc_error] |
| fn main() { |
| Index::<u32>::index(&[1, 2, 3] as &[i32], 2u32); |
| //~^ ERROR E0277 |
| //~| ERROR E0277 |
| } |