rust/tests/ui/get_unwrap.rs

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// run-rustfix
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#![allow(unused_mut)]
#![deny(clippy::get_unwrap)]
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use std::collections::BTreeMap;
use std::collections::HashMap;
use std::collections::VecDeque;
use std::iter::FromIterator;
struct GetFalsePositive {
arr: [u32; 3],
}
impl GetFalsePositive {
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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)
}
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}
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] };
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{
// Test `get().unwrap()`
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let _ = boxed_slice.get(1).unwrap();
let _ = some_slice.get(0).unwrap();
let _ = some_vec.get(0).unwrap();
let _ = some_vecdeque.get(0).unwrap();
let _ = some_hashmap.get(&1).unwrap();
let _ = some_btreemap.get(&1).unwrap();
let _ = false_positive.get(0).unwrap();
// Test with deref
let _: u8 = *boxed_slice.get(1).unwrap();
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}
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{
// Test `get_mut().unwrap()`
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*boxed_slice.get_mut(0).unwrap() = 1;
*some_slice.get_mut(0).unwrap() = 1;
*some_vec.get_mut(0).unwrap() = 1;
*some_vecdeque.get_mut(0).unwrap() = 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;
}
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{
// Test `get().unwrap().foo()` and `get_mut().unwrap().bar()`
let _ = some_vec.get(0..1).unwrap().to_vec();
let _ = some_vec.get_mut(0..1).unwrap().to_vec();
}
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}