7 clippy::mem_replace_option_with_none,
8 clippy::mem_replace_with_default
11 use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, LinkedList, VecDeque};
14 fn replace_option_with_none() {
15 let mut an_option = Some(1);
16 let _ = mem::replace(&mut an_option, None);
17 let an_option = &mut Some(1);
18 let _ = mem::replace(an_option, None);
21 fn replace_with_default() {
22 let mut s = String::from("foo");
23 let _ = std::mem::replace(&mut s, String::default());
25 let s = &mut String::from("foo");
26 let _ = std::mem::replace(s, String::default());
27 let _ = std::mem::replace(s, Default::default());
29 let mut v = vec![123];
30 let _ = std::mem::replace(&mut v, Vec::default());
31 let _ = std::mem::replace(&mut v, Default::default());
32 let _ = std::mem::replace(&mut v, Vec::new());
33 let _ = std::mem::replace(&mut v, vec![]);
35 let mut hash_map: HashMap<i32, i32> = HashMap::new();
36 let _ = std::mem::replace(&mut hash_map, HashMap::new());
38 let mut btree_map: BTreeMap<i32, i32> = BTreeMap::new();
39 let _ = std::mem::replace(&mut btree_map, BTreeMap::new());
41 let mut vd: VecDeque<i32> = VecDeque::new();
42 let _ = std::mem::replace(&mut vd, VecDeque::new());
44 let mut hash_set: HashSet<&str> = HashSet::new();
45 let _ = std::mem::replace(&mut hash_set, HashSet::new());
47 let mut btree_set: BTreeSet<&str> = BTreeSet::new();
48 let _ = std::mem::replace(&mut btree_set, BTreeSet::new());
50 let mut list: LinkedList<i32> = LinkedList::new();
51 let _ = std::mem::replace(&mut list, LinkedList::new());
53 let mut binary_heap: BinaryHeap<i32> = BinaryHeap::new();
54 let _ = std::mem::replace(&mut binary_heap, BinaryHeap::new());
56 let mut tuple = (vec![1, 2], BinaryHeap::<i32>::new());
57 let _ = std::mem::replace(&mut tuple, (vec![], BinaryHeap::new()));
59 let mut refstr = "hello";
60 let _ = std::mem::replace(&mut refstr, "");
62 let mut slice: &[i32] = &[1, 2, 3];
63 let _ = std::mem::replace(&mut slice, &[]);
66 // lint is disabled for primitives because in this case `take`
67 // has no clear benefit over `replace` and sometimes is harder to read
68 fn dont_lint_primitive() {
70 let _ = std::mem::replace(&mut pbool, false);
73 let _ = std::mem::replace(&mut pint, 0);
77 replace_option_with_none();
78 replace_with_default();
79 dont_lint_primitive();
82 #[clippy::msrv = "1.39"]
84 let mut s = String::from("foo");
85 let _ = std::mem::replace(&mut s, String::default());
88 #[clippy::msrv = "1.40"]
90 let mut s = String::from("foo");
91 let _ = std::mem::replace(&mut s, String::default());