src/tools/clippy/tests/ui/get_first.fixed

   1 // run-rustfix
   2 #![warn(clippy::get_first)]
   3 use std::collections::BTreeMap;
   4 use std::collections::HashMap;
   5 use std::collections::VecDeque;
   6
   7 struct Bar {
   8     arr: [u32; 3],
   9 }
  10
  11 impl Bar {
  12     fn get(&self, pos: usize) -> Option<&u32> {
  13         self.arr.get(pos)
  14     }
  15 }
  16
  17 fn main() {
  18     let x = vec![2, 3, 5];
  19     let _ = x.first(); // Use x.first()
  20     let _ = x.get(1);
  21     let _ = x[0];
  22
  23     let y = [2, 3, 5];
  24     let _ = y.first(); // Use y.first()
  25     let _ = y.get(1);
  26     let _ = y[0];
  27
  28     let z = &[2, 3, 5];
  29     let _ = z.first(); // Use z.first()
  30     let _ = z.get(1);
  31     let _ = z[0];
  32
  33     let vecdeque: VecDeque<_> = x.iter().cloned().collect();
  34     let hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(0, 'a'), (1, 'b')]);
  35     let btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(0, 'a'), (1, 'b')]);
  36     let _ = vecdeque.get(0); // Do not lint, because VecDeque is not slice.
  37     let _ = hashmap.get(&0); // Do not lint, because HashMap is not slice.
  38     let _ = btreemap.get(&0); // Do not lint, because BTreeMap is not slice.
  39
  40     let bar = Bar { arr: [0, 1, 2] };
  41     let _ = bar.get(0); // Do not lint, because Bar is struct.
  42 }