blob: ac8ac85824edcc34783e3d161d76cdc9280f30f2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// 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.
// We need to opt inot the `!` feature in order to trigger the
// requirement that this is testing.
#![feature(never_type)]
#![allow(unused)]
trait Deserialize: Sized {
fn deserialize() -> Result<Self, String>;
}
impl Deserialize for () {
fn deserialize() -> Result<(), String> {
Ok(())
}
}
trait ImplementedForUnitButNotNever {}
impl ImplementedForUnitButNotNever for () {}
fn foo<T: ImplementedForUnitButNotNever>(_t: T) {}
//~^ NOTE required by `foo`
fn smeg() {
let _x = return;
foo(_x);
//~^ ERROR the trait bound
//~| NOTE the trait `ImplementedForUnitButNotNever` is not implemented
//~| NOTE the trait is implemented for `()`
}
fn main() {
smeg();
}
|
