1 // Copyright 2014-2019 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution.
4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
7 // option. This file may not be copied, modified, or distributed
8 // except according to those terms.
11 // aux-build:macro_rules.rs
12 #![allow(unused_imports)]
16 clippy::mem_replace_option_with_none,
17 clippy::mem_replace_with_default
21 extern crate macro_rules;
27 std::mem::replace($s, Default::default())
31 fn replace_option_with_none() {
32 let mut an_option = Some(1);
33 let _ = mem::replace(&mut an_option, None);
34 let an_option = &mut Some(1);
35 let _ = mem::replace(an_option, None);
38 fn replace_with_default() {
39 let mut s = String::from("foo");
40 let _ = std::mem::replace(&mut s, String::default());
41 let s = &mut String::from("foo");
42 let _ = std::mem::replace(s, String::default());
43 let _ = std::mem::replace(s, Default::default());
45 // dont lint within macros
51 replace_option_with_none();
52 replace_with_default();