35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test if the on_unimplemented message override works
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#![feature(on_unimplemented)]
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#![feature(rustc_attrs)]
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#[rustc_on_unimplemented = "invalid"]
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trait Index<Idx: ?Sized> {
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type Output: ?Sized;
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fn index(&self, index: Idx) -> &Self::Output;
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}
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#[rustc_on_unimplemented = "a usize is required to index into a slice"]
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impl Index<usize> for [i32] {
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type Output = i32;
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fn index(&self, index: usize) -> &i32 {
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&self[index]
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}
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}
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#[rustc_error]
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fn main() {
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Index::<u32>::index(&[1, 2, 3] as &[i32], 2u32); //~ ERROR E0277
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//~| NOTE a usize is required
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}
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