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// 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)]
struct Foo<T>(T);
struct Bar<T>(T);
#[rustc_on_unimplemented = "trait message"]
trait Index<Idx: ?Sized> {
type Output: ?Sized;
fn index(&self, index: Idx) -> &Self::Output;
}
#[rustc_on_unimplemented = "on impl for Foo"]
impl Index<Foo<usize>> for [i32] {
type Output = i32;
fn index(&self, _index: Foo<usize>) -> &i32 {
loop {}
}
}
#[rustc_on_unimplemented = "on impl for Bar"]
impl Index<Bar<usize>> for [i32] {
type Output = i32;
fn index(&self, _index: Bar<usize>) -> &i32 {
loop {}
}
}
#[rustc_error]
fn main() {
Index::index(&[] as &[i32], 2u32);
//~^ ERROR E0277
//~| NOTE the trait `Index<u32>` is not implemented for `[i32]`
//~| NOTE trait message
//~| NOTE required by
Index::index(&[] as &[i32], Foo(2u32));
//~^ ERROR E0277
//~| NOTE the trait `Index<Foo<u32>>` is not implemented for `[i32]`
//~| NOTE on impl for Foo
//~| NOTE required by
Index::index(&[] as &[i32], Bar(2u32));
//~^ ERROR E0277
//~| NOTE the trait `Index<Bar<u32>>` is not implemented for `[i32]`
//~| NOTE on impl for Bar
//~| NOTE required by
}
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