src/tools/clippy/tests/ui-toml/unwrap_used/unwrap_used.rs

   1 // compile-flags: --test
   2
   3 #![allow(unused_mut, clippy::get_first, clippy::from_iter_instead_of_collect)]
   4 #![warn(clippy::unwrap_used)]
   5 #![deny(clippy::get_unwrap)]
   6
   7 use std::collections::BTreeMap;
   8 use std::collections::HashMap;
   9 use std::collections::VecDeque;
  10
  11 struct GetFalsePositive {
  12     arr: [u32; 3],
  13 }
  14
  15 impl GetFalsePositive {
  16     fn get(&self, pos: usize) -> Option<&u32> {
  17         self.arr.get(pos)
  18     }
  19     fn get_mut(&mut self, pos: usize) -> Option<&mut u32> {
  20         self.arr.get_mut(pos)
  21     }
  22 }
  23
  24 fn main() {
  25     let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
  26     let mut some_slice = &mut [0, 1, 2, 3];
  27     let mut some_vec = vec![0, 1, 2, 3];
  28     let mut some_vecdeque: VecDeque<_> = some_vec.iter().cloned().collect();
  29     let mut some_hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(1, 'a'), (2, 'b')]);
  30     let mut some_btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(1, 'a'), (2, 'b')]);
  31     let mut false_positive = GetFalsePositive { arr: [0, 1, 2] };
  32
  33     {
  34         // Test `get().unwrap()`
  35         let _ = boxed_slice.get(1).unwrap();
  36         let _ = some_slice.get(0).unwrap();
  37         let _ = some_vec.get(0).unwrap();
  38         let _ = some_vecdeque.get(0).unwrap();
  39         let _ = some_hashmap.get(&1).unwrap();
  40         let _ = some_btreemap.get(&1).unwrap();
  41         #[allow(clippy::unwrap_used)]
  42         let _ = false_positive.get(0).unwrap();
  43         // Test with deref
  44         let _: u8 = *boxed_slice.get(1).unwrap();
  45     }
  46
  47     {
  48         // Test `get_mut().unwrap()`
  49         *boxed_slice.get_mut(0).unwrap() = 1;
  50         *some_slice.get_mut(0).unwrap() = 1;
  51         *some_vec.get_mut(0).unwrap() = 1;
  52         *some_vecdeque.get_mut(0).unwrap() = 1;
  53         // Check false positives
  54         #[allow(clippy::unwrap_used)]
  55         {
  56             *some_hashmap.get_mut(&1).unwrap() = 'b';
  57             *some_btreemap.get_mut(&1).unwrap() = 'b';
  58             *false_positive.get_mut(0).unwrap() = 1;
  59         }
  60     }
  61
  62     {
  63         // Test `get().unwrap().foo()` and `get_mut().unwrap().bar()`
  64         let _ = some_vec.get(0..1).unwrap().to_vec();
  65         let _ = some_vec.get_mut(0..1).unwrap().to_vec();
  66     }
  67 }
  68
  69 #[cfg(test)]
  70 mod issue9612 {
  71     // should not lint in `#[cfg(test)]` modules
  72     #[test]
  73     fn test_fn() {
  74         let _a: u8 = 2.try_into().unwrap();
  75         let _a: u8 = 3.try_into().expect("");
  76
  77         util();
  78     }
  79
  80     fn util() {
  81         let _a: u8 = 4.try_into().unwrap();
  82         let _a: u8 = 5.try_into().expect("");
  83         // should still warn
  84         let _ = Box::new([0]).get(1).unwrap();
  85     }
  86 }