mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-23 03:23:33 +00:00
586 lines
12 KiB
Rust
586 lines
12 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::collections::*;
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use std::rc::Rc;
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static STATIC: [usize; 4] = [0, 1, 8, 16];
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const CONST: [usize; 4] = [0, 1, 8, 16];
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#[warn(clippy::all)]
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fn for_loop_over_option_and_result() {
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let option = Some(1);
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let result = option.ok_or("x not found");
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let v = vec![0, 1, 2];
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// check FOR_LOOP_OVER_OPTION lint
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for x in option {
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println!("{}", x);
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}
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// check FOR_LOOP_OVER_RESULT lint
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for x in result {
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println!("{}", x);
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}
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for x in option.ok_or("x not found") {
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println!("{}", x);
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}
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// make sure LOOP_OVER_NEXT lint takes clippy::precedence when next() is the last call
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// in the chain
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for x in v.iter().next() {
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println!("{}", x);
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}
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// make sure we lint when next() is not the last call in the chain
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for x in v.iter().next().and(Some(0)) {
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println!("{}", x);
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}
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for x in v.iter().next().ok_or("x not found") {
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println!("{}", x);
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}
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// check for false positives
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// for loop false positive
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for x in v {
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println!("{}", x);
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}
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// while let false positive for Option
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while let Some(x) = option {
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println!("{}", x);
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break;
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}
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// while let false positive for Result
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while let Ok(x) = result {
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println!("{}", x);
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break;
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}
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}
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struct Unrelated(Vec<u8>);
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impl Unrelated {
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fn next(&self) -> std::slice::Iter<u8> {
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self.0.iter()
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}
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fn iter(&self) -> std::slice::Iter<u8> {
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self.0.iter()
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}
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}
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#[warn(clippy::needless_range_loop, clippy::explicit_iter_loop, clippy::explicit_into_iter_loop, clippy::iter_next_loop, clippy::reverse_range_loop,
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clippy::for_kv_map)]
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#[warn(clippy::unused_collect)]
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#[allow(clippy::linkedlist, clippy::shadow_unrelated, clippy::unnecessary_mut_passed, clippy::cyclomatic_complexity, clippy::similar_names)]
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#[allow(clippy::many_single_char_names, unused_variables)]
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fn main() {
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const MAX_LEN: usize = 42;
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let mut vec = vec![1, 2, 3, 4];
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let vec2 = vec![1, 2, 3, 4];
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for i in 0..vec.len() {
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println!("{}", vec[i]);
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}
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for i in 0..vec.len() {
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let i = 42; // make a different `i`
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println!("{}", vec[i]); // ok, not the `i` of the for-loop
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}
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for i in 0..vec.len() {
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let _ = vec[i];
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}
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// ICE #746
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for j in 0..4 {
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println!("{:?}", STATIC[j]);
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}
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for j in 0..4 {
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println!("{:?}", CONST[j]);
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}
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for i in 0..vec.len() {
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println!("{} {}", vec[i], i);
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}
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for i in 0..vec.len() {
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// not an error, indexing more than one variable
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println!("{} {}", vec[i], vec2[i]);
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}
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for i in 0..vec.len() {
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println!("{}", vec2[i]);
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}
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for i in 5..vec.len() {
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println!("{}", vec[i]);
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}
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for i in 0..MAX_LEN {
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println!("{}", vec[i]);
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}
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for i in 0..=MAX_LEN {
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println!("{}", vec[i]);
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}
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for i in 5..10 {
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println!("{}", vec[i]);
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}
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for i in 5..=10 {
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println!("{}", vec[i]);
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}
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for i in 5..vec.len() {
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println!("{} {}", vec[i], i);
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}
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for i in 5..10 {
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println!("{} {}", vec[i], i);
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}
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for i in 10..0 {
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println!("{}", i);
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}
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for i in 10..=0 {
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println!("{}", i);
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}
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for i in MAX_LEN..0 {
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println!("{}", i);
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}
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for i in 5..5 {
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println!("{}", i);
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}
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for i in 5..=5 {
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// not an error, this is the range with only one element “5”
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println!("{}", i);
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}
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for i in 0..10 {
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// not an error, the start index is less than the end index
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println!("{}", i);
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}
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for i in -10..0 {
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// not an error
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println!("{}", i);
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}
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for i in (10..0).map(|x| x * 2) {
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// not an error, it can't be known what arbitrary methods do to a range
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println!("{}", i);
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}
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// testing that the empty range lint folds constants
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for i in 10..5 + 4 {
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println!("{}", i);
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}
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for i in (5 + 2)..(3 - 1) {
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println!("{}", i);
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}
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for i in (5 + 2)..(8 - 1) {
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println!("{}", i);
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}
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for i in (2 * 2)..(2 * 3) {
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// no error, 4..6 is fine
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println!("{}", i);
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}
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let x = 42;
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for i in x..10 {
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// no error, not constant-foldable
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println!("{}", i);
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}
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// See #601
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for i in 0..10 {
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// no error, id_col does not exist outside the loop
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let mut id_col = vec![0f64; 10];
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id_col[i] = 1f64;
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}
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for _v in vec.iter() {}
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for _v in vec.iter_mut() {}
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let out_vec = vec![1, 2, 3];
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for _v in out_vec.into_iter() {}
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let array = [1, 2, 3];
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for _v in array.into_iter() {}
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for _v in &vec {} // these are fine
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for _v in &mut vec {} // these are fine
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for _v in [1, 2, 3].iter() {}
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for _v in (&mut [1, 2, 3]).iter() {} // no error
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for _v in [0; 32].iter() {}
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for _v in [0; 33].iter() {} // no error
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let ll: LinkedList<()> = LinkedList::new();
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for _v in ll.iter() {}
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let vd: VecDeque<()> = VecDeque::new();
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for _v in vd.iter() {}
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let bh: BinaryHeap<()> = BinaryHeap::new();
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for _v in bh.iter() {}
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let hm: HashMap<(), ()> = HashMap::new();
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for _v in hm.iter() {}
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let bt: BTreeMap<(), ()> = BTreeMap::new();
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for _v in bt.iter() {}
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let hs: HashSet<()> = HashSet::new();
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for _v in hs.iter() {}
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let bs: BTreeSet<()> = BTreeSet::new();
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for _v in bs.iter() {}
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for _v in vec.iter().next() {}
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let u = Unrelated(vec![]);
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for _v in u.next() {} // no error
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for _v in u.iter() {} // no error
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let mut out = vec![];
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vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
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let _y = vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>(); // this is fine
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// Loop with explicit counter variable
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// Potential false positives
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let mut _index = 0;
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_index = 1;
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for _v in &vec {
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_index += 1
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}
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let mut _index = 0;
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_index += 1;
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for _v in &vec {
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_index += 1
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}
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let mut _index = 0;
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if true {
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_index = 1
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}
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for _v in &vec {
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_index += 1
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}
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let mut _index = 0;
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let mut _index = 1;
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for _v in &vec {
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_index += 1
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}
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let mut _index = 0;
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for _v in &vec {
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_index += 1;
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_index += 1
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}
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let mut _index = 0;
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for _v in &vec {
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_index *= 2;
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_index += 1
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}
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let mut _index = 0;
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for _v in &vec {
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_index = 1;
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_index += 1
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}
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let mut _index = 0;
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for _v in &vec {
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let mut _index = 0;
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_index += 1
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}
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let mut _index = 0;
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for _v in &vec {
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_index += 1;
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_index = 0;
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}
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let mut _index = 0;
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for _v in &vec {
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for _x in 0..1 {
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_index += 1;
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}
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_index += 1
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}
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let mut _index = 0;
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for x in &vec {
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if *x == 1 {
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_index += 1
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}
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}
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let mut _index = 0;
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if true {
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_index = 1
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};
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for _v in &vec {
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_index += 1
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}
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let mut _index = 1;
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if false {
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_index = 0
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};
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for _v in &vec {
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_index += 1
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}
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let mut index = 0;
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{
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let mut _x = &mut index;
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}
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for _v in &vec {
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_index += 1
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}
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let mut index = 0;
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for _v in &vec {
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index += 1
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}
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println!("index: {}", index);
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for_loop_over_option_and_result();
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let m: HashMap<u64, u64> = HashMap::new();
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for (_, v) in &m {
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let _v = v;
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}
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let m: Rc<HashMap<u64, u64>> = Rc::new(HashMap::new());
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for (_, v) in &*m {
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let _v = v;
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// Here the `*` is not actually necessary, but the test tests that we don't
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// suggest
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// `in *m.values()` as we used to
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}
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let mut m: HashMap<u64, u64> = HashMap::new();
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for (_, v) in &mut m {
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let _v = v;
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}
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let m: &mut HashMap<u64, u64> = &mut HashMap::new();
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for (_, v) in &mut *m {
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let _v = v;
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}
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let m: HashMap<u64, u64> = HashMap::new();
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let rm = &m;
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for (k, _value) in rm {
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let _k = k;
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}
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test_for_kv_map();
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fn f<T>(_: &T, _: &T) -> bool {
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unimplemented!()
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}
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fn g<T>(_: &mut [T], _: usize, _: usize) {
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unimplemented!()
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}
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for i in 1..vec.len() {
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if f(&vec[i - 1], &vec[i]) {
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g(&mut vec, i - 1, i);
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}
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}
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for mid in 1..vec.len() {
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let (_, _) = vec.split_at(mid);
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}
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}
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#[allow(clippy::used_underscore_binding)]
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fn test_for_kv_map() {
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let m: HashMap<u64, u64> = HashMap::new();
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// No error, _value is actually used
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for (k, _value) in &m {
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let _ = _value;
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let _k = k;
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}
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}
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#[allow(dead_code)]
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fn partition<T: PartialOrd + Send>(v: &mut [T]) -> usize {
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let pivot = v.len() - 1;
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let mut i = 0;
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for j in 0..pivot {
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if v[j] <= v[pivot] {
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v.swap(i, j);
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i += 1;
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}
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}
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v.swap(i, pivot);
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i
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}
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const LOOP_OFFSET: usize = 5000;
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#[warn(clippy::needless_range_loop)]
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pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) {
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// plain manual memcpy
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for i in 0..src.len() {
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dst[i] = src[i];
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}
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// dst offset memcpy
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for i in 0..src.len() {
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dst[i + 10] = src[i];
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}
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// src offset memcpy
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for i in 0..src.len() {
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dst[i] = src[i + 10];
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}
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// src offset memcpy
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for i in 11..src.len() {
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dst[i] = src[i - 10];
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}
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// overwrite entire dst
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for i in 0..dst.len() {
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dst[i] = src[i];
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}
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// manual copy with branch - can't easily convert to memcpy!
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for i in 0..src.len() {
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dst[i] = src[i];
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if dst[i] > 5 {
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break;
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}
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}
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// multiple copies - suggest two memcpy statements
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for i in 10..256 {
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dst[i] = src[i - 5];
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dst2[i + 500] = src[i]
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}
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// this is a reversal - the copy lint shouldn't be triggered
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for i in 10..LOOP_OFFSET {
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dst[i + LOOP_OFFSET] = src[LOOP_OFFSET - i];
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}
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let some_var = 5;
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// Offset in variable
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for i in 10..LOOP_OFFSET {
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dst[i + LOOP_OFFSET] = src[i - some_var];
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}
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// Non continuous copy - don't trigger lint
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for i in 0..10 {
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dst[i + i] = src[i];
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}
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let src_vec = vec![1, 2, 3, 4, 5];
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let mut dst_vec = vec![0, 0, 0, 0, 0];
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// make sure vectors are supported
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for i in 0..src_vec.len() {
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dst_vec[i] = src_vec[i];
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}
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// lint should not trigger when either
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// source or destination type is not
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// slice-like, like DummyStruct
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struct DummyStruct(i32);
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impl ::std::ops::Index<usize> for DummyStruct {
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type Output = i32;
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fn index(&self, _: usize) -> &i32 {
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&self.0
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}
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}
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let src = DummyStruct(5);
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let mut dst_vec = vec![0; 10];
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for i in 0..10 {
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dst_vec[i] = src[i];
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}
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// Simplify suggestion (issue #3004)
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let src = [0, 1, 2, 3, 4];
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let mut dst = [0, 0, 0, 0, 0, 0];
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let from = 1;
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for i in from..from + src.len() {
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dst[i] = src[i - from];
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}
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for i in from..from + 3 {
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dst[i] = src[i - from];
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}
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}
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#[warn(clippy::needless_range_loop)]
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pub fn manual_clone(src: &[String], dst: &mut [String]) {
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for i in 0..src.len() {
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dst[i] = src[i].clone();
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}
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}
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#[warn(clippy::needless_range_loop)]
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pub fn manual_copy_same_destination(dst: &mut [i32], d: usize, s: usize) {
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// Same source and destination - don't trigger lint
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for i in 0..dst.len() {
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dst[d + i] = dst[s + i];
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}
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}
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mod issue_2496 {
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pub trait Handle {
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fn new_for_index(index: usize) -> Self;
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fn index(&self) -> usize;
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}
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pub fn test<H: Handle>() -> H {
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for x in 0..5 {
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let next_handle = H::new_for_index(x);
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println!("{}", next_handle.index());
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}
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unimplemented!()
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}
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}
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