diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/get_first.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/get_first.rs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/get_first.rs b/src/tools/clippy/tests/ui/get_first.rs new file mode 100644 index 000000000..85a381854 --- /dev/null +++ b/src/tools/clippy/tests/ui/get_first.rs @@ -0,0 +1,42 @@ +// run-rustfix +#![warn(clippy::get_first)] +use std::collections::BTreeMap; +use std::collections::HashMap; +use std::collections::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.get(0); // Use x.first() + let _ = x.get(1); + let _ = x[0]; + + let y = [2, 3, 5]; + let _ = y.get(0); // Use y.first() + let _ = y.get(1); + let _ = y[0]; + + let z = &[2, 3, 5]; + let _ = z.get(0); // Use z.first() + let _ = z.get(1); + let _ = z[0]; + + let vecdeque: VecDeque<_> = x.iter().cloned().collect(); + 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 _ = vecdeque.get(0); // Do not lint, because VecDeque is not slice. + 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. +} |