mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-18 09:03:18 +00:00
573 lines
12 KiB
Rust
573 lines
12 KiB
Rust
|
|
|
|
|
|
use std::collections::*;
|
|
use std::rc::Rc;
|
|
|
|
static STATIC: [usize; 4] = [0, 1, 8, 16];
|
|
const CONST: [usize; 4] = [0, 1, 8, 16];
|
|
|
|
#[warn(clippy)]
|
|
fn for_loop_over_option_and_result() {
|
|
let option = Some(1);
|
|
let result = option.ok_or("x not found");
|
|
let v = vec![0, 1, 2];
|
|
|
|
// check FOR_LOOP_OVER_OPTION lint
|
|
for x in option {
|
|
println!("{}", x);
|
|
}
|
|
|
|
// check FOR_LOOP_OVER_RESULT lint
|
|
for x in result {
|
|
println!("{}", x);
|
|
}
|
|
|
|
for x in option.ok_or("x not found") {
|
|
println!("{}", x);
|
|
}
|
|
|
|
// make sure LOOP_OVER_NEXT lint takes precedence when next() is the last call
|
|
// in the chain
|
|
for x in v.iter().next() {
|
|
println!("{}", x);
|
|
}
|
|
|
|
// make sure we lint when next() is not the last call in the chain
|
|
for x in v.iter().next().and(Some(0)) {
|
|
println!("{}", x);
|
|
}
|
|
|
|
for x in v.iter().next().ok_or("x not found") {
|
|
println!("{}", x);
|
|
}
|
|
|
|
// check for false positives
|
|
|
|
// for loop false positive
|
|
for x in v {
|
|
println!("{}", x);
|
|
}
|
|
|
|
// while let false positive for Option
|
|
while let Some(x) = option {
|
|
println!("{}", x);
|
|
break;
|
|
}
|
|
|
|
// while let false positive for Result
|
|
while let Ok(x) = result {
|
|
println!("{}", x);
|
|
break;
|
|
}
|
|
}
|
|
|
|
struct Unrelated(Vec<u8>);
|
|
impl Unrelated {
|
|
fn next(&self) -> std::slice::Iter<u8> {
|
|
self.0.iter()
|
|
}
|
|
|
|
fn iter(&self) -> std::slice::Iter<u8> {
|
|
self.0.iter()
|
|
}
|
|
}
|
|
|
|
#[warn(needless_range_loop, explicit_iter_loop, explicit_into_iter_loop, iter_next_loop, reverse_range_loop,
|
|
explicit_counter_loop, for_kv_map)]
|
|
#[warn(unused_collect)]
|
|
#[allow(linkedlist, shadow_unrelated, unnecessary_mut_passed, cyclomatic_complexity, similar_names)]
|
|
#[allow(many_single_char_names, unused_variables)]
|
|
fn main() {
|
|
const MAX_LEN: usize = 42;
|
|
|
|
let mut vec = vec![1, 2, 3, 4];
|
|
let vec2 = vec![1, 2, 3, 4];
|
|
for i in 0..vec.len() {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 0..vec.len() {
|
|
let i = 42; // make a different `i`
|
|
println!("{}", vec[i]); // ok, not the `i` of the for-loop
|
|
}
|
|
|
|
for i in 0..vec.len() {
|
|
let _ = vec[i];
|
|
}
|
|
|
|
// ICE #746
|
|
for j in 0..4 {
|
|
println!("{:?}", STATIC[j]);
|
|
}
|
|
|
|
for j in 0..4 {
|
|
println!("{:?}", CONST[j]);
|
|
}
|
|
|
|
for i in 0..vec.len() {
|
|
println!("{} {}", vec[i], i);
|
|
}
|
|
for i in 0..vec.len() {
|
|
// not an error, indexing more than one variable
|
|
println!("{} {}", vec[i], vec2[i]);
|
|
}
|
|
|
|
for i in 0..vec.len() {
|
|
println!("{}", vec2[i]);
|
|
}
|
|
|
|
for i in 5..vec.len() {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 0..MAX_LEN {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 0..=MAX_LEN {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 5..10 {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 5..=10 {
|
|
println!("{}", vec[i]);
|
|
}
|
|
|
|
for i in 5..vec.len() {
|
|
println!("{} {}", vec[i], i);
|
|
}
|
|
|
|
for i in 5..10 {
|
|
println!("{} {}", vec[i], i);
|
|
}
|
|
|
|
for i in 10..0 {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in 10..=0 {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in MAX_LEN..0 {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in 5..5 {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in 5..=5 {
|
|
// not an error, this is the range with only one element “5”
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in 0..10 {
|
|
// not an error, the start index is less than the end index
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in -10..0 {
|
|
// not an error
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in (10..0).map(|x| x * 2) {
|
|
// not an error, it can't be known what arbitrary methods do to a range
|
|
println!("{}", i);
|
|
}
|
|
|
|
// testing that the empty range lint folds constants
|
|
for i in 10..5 + 4 {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in (5 + 2)..(3 - 1) {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in (5 + 2)..(8 - 1) {
|
|
println!("{}", i);
|
|
}
|
|
|
|
for i in (2 * 2)..(2 * 3) {
|
|
// no error, 4..6 is fine
|
|
println!("{}", i);
|
|
}
|
|
|
|
let x = 42;
|
|
for i in x..10 {
|
|
// no error, not constant-foldable
|
|
println!("{}", i);
|
|
}
|
|
|
|
// See #601
|
|
for i in 0..10 {
|
|
// no error, id_col does not exist outside the loop
|
|
let mut id_col = vec![0f64; 10];
|
|
id_col[i] = 1f64;
|
|
}
|
|
|
|
for _v in vec.iter() {}
|
|
|
|
for _v in vec.iter_mut() {}
|
|
|
|
let out_vec = vec![1, 2, 3];
|
|
for _v in out_vec.into_iter() {}
|
|
|
|
let array = [1, 2, 3];
|
|
for _v in array.into_iter() {}
|
|
|
|
for _v in &vec {} // these are fine
|
|
for _v in &mut vec {} // these are fine
|
|
|
|
for _v in [1, 2, 3].iter() {}
|
|
|
|
for _v in (&mut [1, 2, 3]).iter() {} // no error
|
|
|
|
for _v in [0; 32].iter() {}
|
|
|
|
for _v in [0; 33].iter() {} // no error
|
|
|
|
let ll: LinkedList<()> = LinkedList::new();
|
|
for _v in ll.iter() {}
|
|
|
|
let vd: VecDeque<()> = VecDeque::new();
|
|
for _v in vd.iter() {}
|
|
|
|
let bh: BinaryHeap<()> = BinaryHeap::new();
|
|
for _v in bh.iter() {}
|
|
|
|
let hm: HashMap<(), ()> = HashMap::new();
|
|
for _v in hm.iter() {}
|
|
|
|
let bt: BTreeMap<(), ()> = BTreeMap::new();
|
|
for _v in bt.iter() {}
|
|
|
|
let hs: HashSet<()> = HashSet::new();
|
|
for _v in hs.iter() {}
|
|
|
|
let bs: BTreeSet<()> = BTreeSet::new();
|
|
for _v in bs.iter() {}
|
|
|
|
for _v in vec.iter().next() {}
|
|
|
|
let u = Unrelated(vec![]);
|
|
for _v in u.next() {} // no error
|
|
for _v in u.iter() {} // no error
|
|
|
|
let mut out = vec![];
|
|
vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
|
|
let _y = vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>(); // this is fine
|
|
|
|
// Loop with explicit counter variable
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 1;
|
|
_index = 0;
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
// Potential false positives
|
|
let mut _index = 0;
|
|
_index = 1;
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
_index += 1;
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
if true {
|
|
_index = 1
|
|
}
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
let mut _index = 1;
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
_index += 1;
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
_index *= 2;
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
_index = 1;
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
|
|
for _v in &vec {
|
|
let mut _index = 0;
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
_index += 1;
|
|
_index = 0;
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for _v in &vec {
|
|
for _x in 0..1 {
|
|
_index += 1;
|
|
}
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 0;
|
|
for x in &vec {
|
|
if *x == 1 {
|
|
_index += 1
|
|
}
|
|
}
|
|
|
|
let mut _index = 0;
|
|
if true {
|
|
_index = 1
|
|
};
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut _index = 1;
|
|
if false {
|
|
_index = 0
|
|
};
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut index = 0;
|
|
{
|
|
let mut _x = &mut index;
|
|
}
|
|
for _v in &vec {
|
|
_index += 1
|
|
}
|
|
|
|
let mut index = 0;
|
|
for _v in &vec {
|
|
index += 1
|
|
}
|
|
println!("index: {}", index);
|
|
|
|
for_loop_over_option_and_result();
|
|
|
|
let m: HashMap<u64, u64> = HashMap::new();
|
|
for (_, v) in &m {
|
|
let _v = v;
|
|
}
|
|
|
|
let m: Rc<HashMap<u64, u64>> = Rc::new(HashMap::new());
|
|
for (_, v) in &*m {
|
|
let _v = v;
|
|
// Here the `*` is not actually necesarry, but the test tests that we don't
|
|
// suggest
|
|
// `in *m.values()` as we used to
|
|
}
|
|
|
|
let mut m: HashMap<u64, u64> = HashMap::new();
|
|
for (_, v) in &mut m {
|
|
let _v = v;
|
|
}
|
|
|
|
let m: &mut HashMap<u64, u64> = &mut HashMap::new();
|
|
for (_, v) in &mut *m {
|
|
let _v = v;
|
|
}
|
|
|
|
let m: HashMap<u64, u64> = HashMap::new();
|
|
let rm = &m;
|
|
for (k, _value) in rm {
|
|
let _k = k;
|
|
}
|
|
|
|
test_for_kv_map();
|
|
|
|
fn f<T>(_: &T, _: &T) -> bool {
|
|
unimplemented!()
|
|
}
|
|
fn g<T>(_: &mut [T], _: usize, _: usize) {
|
|
unimplemented!()
|
|
}
|
|
for i in 1..vec.len() {
|
|
if f(&vec[i - 1], &vec[i]) {
|
|
g(&mut vec, i - 1, i);
|
|
}
|
|
}
|
|
|
|
for mid in 1..vec.len() {
|
|
let (_, _) = vec.split_at(mid);
|
|
}
|
|
}
|
|
|
|
#[allow(used_underscore_binding)]
|
|
fn test_for_kv_map() {
|
|
let m: HashMap<u64, u64> = HashMap::new();
|
|
|
|
// No error, _value is actually used
|
|
for (k, _value) in &m {
|
|
let _ = _value;
|
|
let _k = k;
|
|
}
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
fn partition<T: PartialOrd + Send>(v: &mut [T]) -> usize {
|
|
let pivot = v.len() - 1;
|
|
let mut i = 0;
|
|
for j in 0..pivot {
|
|
if v[j] <= v[pivot] {
|
|
v.swap(i, j);
|
|
i += 1;
|
|
}
|
|
}
|
|
v.swap(i, pivot);
|
|
i
|
|
}
|
|
|
|
const LOOP_OFFSET: usize = 5000;
|
|
|
|
#[warn(needless_range_loop)]
|
|
pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) {
|
|
// plain manual memcpy
|
|
for i in 0..src.len() {
|
|
dst[i] = src[i];
|
|
}
|
|
|
|
// dst offset memcpy
|
|
for i in 0..src.len() {
|
|
dst[i + 10] = src[i];
|
|
}
|
|
|
|
// src offset memcpy
|
|
for i in 0..src.len() {
|
|
dst[i] = src[i + 10];
|
|
}
|
|
|
|
// src offset memcpy
|
|
for i in 11..src.len() {
|
|
dst[i] = src[i - 10];
|
|
}
|
|
|
|
// overwrite entire dst
|
|
for i in 0..dst.len() {
|
|
dst[i] = src[i];
|
|
}
|
|
|
|
// manual copy with branch - can't easily convert to memcpy!
|
|
for i in 0..src.len() {
|
|
dst[i] = src[i];
|
|
if dst[i] > 5 {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// multiple copies - suggest two memcpy statements
|
|
for i in 10..256 {
|
|
dst[i] = src[i - 5];
|
|
dst2[i + 500] = src[i]
|
|
}
|
|
|
|
// this is a reversal - the copy lint shouldn't be triggered
|
|
for i in 10..LOOP_OFFSET {
|
|
dst[i + LOOP_OFFSET] = src[LOOP_OFFSET - i];
|
|
}
|
|
|
|
let some_var = 5;
|
|
// Offset in variable
|
|
for i in 10..LOOP_OFFSET {
|
|
dst[i + LOOP_OFFSET] = src[i - some_var];
|
|
}
|
|
|
|
// Non continuous copy - don't trigger lint
|
|
for i in 0..10 {
|
|
dst[i + i] = src[i];
|
|
}
|
|
|
|
let src_vec = vec![1, 2, 3, 4, 5];
|
|
let mut dst_vec = vec![0, 0, 0, 0, 0];
|
|
|
|
// make sure vectors are supported
|
|
for i in 0..src_vec.len() {
|
|
dst_vec[i] = src_vec[i];
|
|
}
|
|
|
|
// lint should not trigger when either
|
|
// source or destination type is not
|
|
// slice-like, like DummyStruct
|
|
struct DummyStruct(i32);
|
|
|
|
impl ::std::ops::Index<usize> for DummyStruct {
|
|
type Output = i32;
|
|
|
|
fn index(&self, _: usize) -> &i32 {
|
|
&self.0
|
|
}
|
|
}
|
|
|
|
let src = DummyStruct(5);
|
|
let mut dst_vec = vec![0; 10];
|
|
|
|
for i in 0..10 {
|
|
dst_vec[i] = src[i];
|
|
}
|
|
}
|
|
|
|
#[warn(needless_range_loop)]
|
|
pub fn manual_clone(src: &[String], dst: &mut [String]) {
|
|
for i in 0..src.len() {
|
|
dst[i] = src[i].clone();
|
|
}
|
|
}
|
|
|
|
#[warn(needless_range_loop)]
|
|
pub fn manual_copy_same_destination(dst: &mut [i32], d: usize, s: usize) {
|
|
// Same source and destination - don't trigger lint
|
|
for i in 0..dst.len() {
|
|
dst[d + i] = dst[s + i];
|
|
}
|
|
}
|
|
|
|
mod issue_2496 {
|
|
pub trait Handle {
|
|
fn new_for_index(index: usize) -> Self;
|
|
fn index(&self) -> usize;
|
|
}
|
|
|
|
pub fn test<H: Handle>() -> H {
|
|
for x in 0..5 {
|
|
let next_handle = H::new_for_index(x);
|
|
println!("{}", next_handle.index());
|
|
}
|
|
unimplemented!()
|
|
}
|
|
}
|