1// run-rustfix
2#![allow(unused_mut, clippy::from_iter_instead_of_collect)]
3#![deny(clippy::get_unwrap)]
4
5use std::collections::BTreeMap;
6use std::collections::HashMap;
7use std::collections::VecDeque;
8use std::iter::FromIterator;
9
10struct GetFalsePositive {
11    arr: [u32; 3],
12}
13
14impl GetFalsePositive {
15    fn get(&self, pos: usize) -> Option<&u32> {
16        self.arr.get(pos)
17    }
18    fn get_mut(&mut self, pos: usize) -> Option<&mut u32> {
19        self.arr.get_mut(pos)
20    }
21}
22
23fn main() {
24    let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
25    let mut some_slice = &mut [0, 1, 2, 3];
26    let mut some_vec = vec![0, 1, 2, 3];
27    let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect();
28    let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]);
29    let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]);
30    let mut false_positive = GetFalsePositive { arr: [0, 1, 2] };
31
32    {
33        // Test `get().unwrap()`
34        let _ = &boxed_slice[1];
35        let _ = &some_slice[0];
36        let _ = &some_vec[0];
37        let _ = &some_vecdeque[0];
38        let _ = &some_hashmap[&1];
39        let _ = &some_btreemap[&1];
40        let _ = false_positive.get(0).unwrap();
41        // Test with deref
42        let _: u8 = boxed_slice[1];
43    }
44
45    {
46        // Test `get_mut().unwrap()`
47        boxed_slice[0] = 1;
48        some_slice[0] = 1;
49        some_vec[0] = 1;
50        some_vecdeque[0] = 1;
51        // Check false positives
52        *some_hashmap.get_mut(&1).unwrap() = 'b';
53        *some_btreemap.get_mut(&1).unwrap() = 'b';
54        *false_positive.get_mut(0).unwrap() = 1;
55    }
56
57    {
58        // Test `get().unwrap().foo()` and `get_mut().unwrap().bar()`
59        let _ = some_vec[0..1].to_vec();
60        let _ = some_vec[0..1].to_vec();
61    }
62}
63