rust-clippy/tests/ui/get_first.fixed

50 lines
1.4 KiB
Rust

#![warn(clippy::get_first)]
#![allow(clippy::useless_vec)]
use std::collections::{BTreeMap, HashMap, VecDeque};
struct Bar {
arr: [u32; 3],
}
impl Bar {
fn get(&self, pos: usize) -> Option<&u32> {
self.arr.get(pos)
}
}
fn main() {
let x = vec![2, 3, 5];
let _ = x.first();
//~^ ERROR: accessing first element with `x.get(0)`
let _ = x.get(1);
let _ = x[0];
let y = [2, 3, 5];
let _ = y.first();
//~^ ERROR: accessing first element with `y.get(0)`
let _ = y.get(1);
let _ = y[0];
let z = &[2, 3, 5];
let _ = z.first();
//~^ ERROR: accessing first element with `z.get(0)`
let _ = z.get(1);
let _ = z[0];
let vecdeque: VecDeque<_> = x.iter().cloned().collect();
let _ = vecdeque.front();
//~^ ERROR: accessing first element with `vecdeque.get(0)`
let _ = vecdeque.get(1);
let hashmap: HashMap<u8, char> = HashMap::from_iter(vec![(0, 'a'), (1, 'b')]);
let btreemap: BTreeMap<u8, char> = BTreeMap::from_iter(vec![(0, 'a'), (1, 'b')]);
let _ = hashmap.get(&0); // Do not lint, because HashMap is not slice.
let _ = btreemap.get(&0); // Do not lint, because BTreeMap is not slice.
let bar = Bar { arr: [0, 1, 2] };
let _ = bar.get(0); // Do not lint, because Bar is struct.
let non_primitives = [vec![1, 2], vec![3, 4]];
let _ = non_primitives.first();
//~^ ERROR: accessing first element with `non_primitives.get(0)`
}