53 lines
1.4 KiB
Rust
53 lines
1.4 KiB
Rust
// Copyright 2014-2019 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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// run-rustfix
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// aux-build:macro_rules.rs
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#![allow(unused_imports)]
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#![warn(
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clippy::all,
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clippy::style,
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clippy::mem_replace_option_with_none,
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clippy::mem_replace_with_default
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)]
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#[macro_use]
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extern crate macro_rules;
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use std::mem;
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macro_rules! take {
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($s:expr) => {
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std::mem::replace($s, Default::default())
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};
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}
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fn replace_option_with_none() {
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let mut an_option = Some(1);
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let _ = mem::replace(&mut an_option, None);
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let an_option = &mut Some(1);
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let _ = mem::replace(an_option, None);
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}
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fn replace_with_default() {
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let mut s = String::from("foo");
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let _ = std::mem::replace(&mut s, String::default());
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let s = &mut String::from("foo");
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let _ = std::mem::replace(s, String::default());
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let _ = std::mem::replace(s, Default::default());
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// dont lint within macros
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take!(s);
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take_external!(s);
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}
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fn main() {
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replace_option_with_none();
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replace_with_default();
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}
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