// run-rustfix #![allow(unused_mut)] #![deny(clippy::get_unwrap)] use std::collections::BTreeMap; use std::collections::HashMap; use std::collections::VecDeque; use std::iter::FromIterator; struct GetFalsePositive { arr: [u32; 3], } impl GetFalsePositive { fn get(&self, pos: usize) -> Option<&u32> { self.arr.get(pos) } fn get_mut(&mut self, pos: usize) -> Option<&mut u32> { self.arr.get_mut(pos) } } fn main() { let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]); let mut some_slice = &mut [0, 1, 2, 3]; let mut some_vec = vec![0, 1, 2, 3]; let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect(); let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]); let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]); let mut false_positive = GetFalsePositive { arr: [0, 1, 2] }; { // Test `get().unwrap()` let _ = &boxed_slice[1]; let _ = &some_slice[0]; let _ = &some_vec[0]; let _ = &some_vecdeque[0]; let _ = &some_hashmap[&1]; let _ = &some_btreemap[&1]; let _ = false_positive.get(0).unwrap(); // Test with deref let _: u8 = boxed_slice[1]; } { // Test `get_mut().unwrap()` boxed_slice[0] = 1; some_slice[0] = 1; some_vec[0] = 1; some_vecdeque[0] = 1; // Check false positives *some_hashmap.get_mut(&1).unwrap() = 'b'; *some_btreemap.get_mut(&1).unwrap() = 'b'; *false_positive.get_mut(0).unwrap() = 1; } { // Test `get().unwrap().foo()` and `get_mut().unwrap().bar()` let _ = some_vec[0..1].to_vec(); let _ = some_vec[0..1].to_vec(); } }