60 lines
1.4 KiB
Rust
60 lines
1.4 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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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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#![feature(tool_lints)]
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#![warn(clippy::let_unit_value)]
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#![allow(unused_variables)]
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macro_rules! let_and_return {
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($n:expr) => {{
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let ret = $n;
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}}
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}
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fn main() {
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let _x = println!("x");
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let _y = 1; // this is fine
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let _z = ((), 1); // this as well
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if true {
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let _a = ();
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}
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consume_units_with_for_loop(); // should be fine as well
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let_and_return!(()) // should be fine
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}
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// Related to issue #1964
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fn consume_units_with_for_loop() {
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// `for_let_unit` lint should not be triggered by consuming them using for loop.
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let v = vec![(), (), ()];
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let mut count = 0;
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for _ in v {
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count += 1;
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}
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assert_eq!(count, 3);
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// Same for consuming from some other Iterator<Item = ()>.
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let (tx, rx) = ::std::sync::mpsc::channel();
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tx.send(()).unwrap();
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drop(tx);
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count = 0;
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for _ in rx.iter() {
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count += 1;
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}
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assert_eq!(count, 1);
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}
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#[derive(Copy, Clone)]
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pub struct ContainsUnit(()); // should be fine
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