rust/tests/ui/unused_unit.rs

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2018-09-27 12:10:20 -05:00
// Copyright 2017 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.
// compile-pass
// The output for humans should just highlight the whole span without showing
// the suggested replacement, but we also want to test that suggested
// replacement only removes one set of parentheses, rather than naïvely
// stripping away any starting or ending parenthesis characters—hence this
// test of the JSON error format.
#![deny(clippy::unused_unit)]
#![allow(clippy::needless_return)]
struct Unitter;
impl Unitter {
// try to disorient the lint with multiple unit returns and newlines
pub fn get_unit<F: Fn() -> (), G>(&self, f: F, _g: G) ->
()
where G: Fn() -> () {
let _y: &Fn() -> () = &f;
(); // this should not lint, as it's not in return type position
}
}
impl Into<()> for Unitter {
#[rustfmt::skip]
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fn into(self) -> () {
()
}
}
fn return_unit() -> () { () }
fn main() {
let u = Unitter;
assert_eq!(u.get_unit(|| {}, return_unit), u.into());
return_unit();
loop {
break();
}
return();
}