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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.
#![allow(dead_code)]
#![allow(unreachable_code)]
#![deny(resolve_trait_on_defaulted_unit)]
trait Deserialize: Sized {
fn deserialize() -> Result<Self, String>;
}
impl Deserialize for () {
fn deserialize() -> Result<(), String> {
Ok(())
}
}
fn doit() -> Result<(), String> {
let _ = match Deserialize::deserialize() {
//~^ ERROR code relies on type
//~| WARNING previously accepted
Ok(x) => x,
Err(e) => return Err(e),
};
Ok(())
}
trait ImplementedForUnitButNotNever {}
impl ImplementedForUnitButNotNever for () {}
fn foo<T: ImplementedForUnitButNotNever>(_t: T) {}
fn smeg() {
let _x = return;
foo(_x);
//~^ ERROR code relies on type
//~| WARNING previously accepted
}
fn main() {
let _ = doit();
}
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