335 lines
10 KiB
Rust
335 lines
10 KiB
Rust
#![feature(plugin, step_by)]
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#![plugin(clippy)]
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use std::collections::*;
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#[deny(clippy)]
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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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//~^ ERROR for loop over `option`, which is an `Option`.
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//~| HELP consider replacing `for x in option` with `if let Some(x) = 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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//~^ ERROR for loop over `result`, which is a `Result`.
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//~| HELP consider replacing `for x in result` with `if let Ok(x) = 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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//~^ ERROR for loop over `option.ok_or("x not found")`, which is a `Result`.
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//~| HELP consider replacing `for x in option.ok_or("x not found")` with `if let Ok(x) = 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 precedence when next() is the last call in the chain
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for x in v.iter().next() {
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//~^ ERROR you are iterating over `Iterator::next()` which is an Option
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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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//~^ ERROR for loop over `v.iter().next().and(Some(0))`, which is an `Option`
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//~| HELP consider replacing `for x in v.iter().next().and(Some(0))` with `if let Some(x) = 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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//~^ ERROR for loop over `v.iter().next().ok_or("x not found")`, which is a `Result`
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//~| HELP consider replacing `for x in v.iter().next().ok_or("x not found")` with `if let Ok(x) = 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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#[deny(needless_range_loop, explicit_iter_loop, iter_next_loop, reverse_range_loop, explicit_counter_loop)]
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#[deny(unused_collect)]
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#[allow(linkedlist, shadow_unrelated, unnecessary_mut_passed, cyclomatic_complexity)]
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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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//~^ ERROR `i` is only used to index `vec`. Consider using `for item in &vec`
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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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//~^ ERROR `i` is used to index `vec`. Consider using `for (i, item) in vec.iter().enumerate()`
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println!("{} {}", vec[i], i);
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}
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for i in 0..vec.len() { // 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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//~^ ERROR `i` is only used to index `vec2`. Consider using `for item in vec2.iter().take(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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//~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().skip(5)`
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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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//~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().take(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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//~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().take(10).skip(5)`
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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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//~^ ERROR `i` is used to index `vec`. Consider using `for (i, item) in vec.iter().enumerate().skip(5)`
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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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//~^ ERROR `i` is used to index `vec`. Consider using `for (i, item) in vec.iter().enumerate().take(10).skip(5)`
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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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//~^ERROR this range is empty so this for loop will never run
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//~|HELP consider
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//~|SUGGESTION (0..10).rev()
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println!("{}", i);
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}
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for i in MAX_LEN..0 { //~ERROR this range is empty so this for loop will never run
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//~|HELP consider
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//~|SUGGESTION (0..MAX_LEN).rev()
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println!("{}", i);
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}
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for i in 5..5 { //~ERROR this range is empty so this for loop will never run
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println!("{}", i);
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}
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for i in 0..10 { // 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 { // not an error
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println!("{}", i);
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}
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for i in (10..0).rev() { // not an error, this is an established idiom for looping backwards on a range
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println!("{}", i);
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}
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for i in (10..0).map(|x| x * 2) { // 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 { //~ERROR this range is empty so this for loop will never run
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println!("{}", i);
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}
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for i in (5+2)..(3-1) { //~ERROR this range is empty so this for loop will never run
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println!("{}", i);
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}
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for i in (5+2)..(8-1) { //~ERROR this range is empty so this for loop will never run
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println!("{}", i);
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}
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for i in (2*2)..(2*3) { // no error, 4..6 is fine
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println!("{}", i);
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}
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for i in (10..8).step_by(-1) {
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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 { // 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 { // 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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/*
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for i in (10..0).map(|x| x * 2) {
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println!("{}", i);
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}*/
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for _v in vec.iter() { } //~ERROR it is more idiomatic to loop over `&vec`
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for _v in vec.iter_mut() { } //~ERROR it is more idiomatic to loop over `&mut vec`
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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() { } //~ERROR it is more idiomatic to loop over `&[
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for _v in (&mut [1, 2, 3]).iter() { } // no error
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for _v in [0; 32].iter() {} //~ERROR it is more idiomatic to loop over `&[
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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() { } //~ERROR it is more idiomatic to loop over `&ll`
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let vd: VecDeque<()> = VecDeque::new();
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for _v in vd.iter() { } //~ERROR it is more idiomatic to loop over `&vd`
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let bh: BinaryHeap<()> = BinaryHeap::new();
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for _v in bh.iter() { } //~ERROR it is more idiomatic to loop over `&bh`
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let hm: HashMap<(), ()> = HashMap::new();
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for _v in hm.iter() { } //~ERROR it is more idiomatic to loop over `&hm`
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let bt: BTreeMap<(), ()> = BTreeMap::new();
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for _v in bt.iter() { } //~ERROR it is more idiomatic to loop over `&bt`
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let hs: HashSet<()> = HashSet::new();
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for _v in hs.iter() { } //~ERROR it is more idiomatic to loop over `&hs`
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let bs: BTreeSet<()> = BTreeSet::new();
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for _v in bs.iter() { } //~ERROR it is more idiomatic to loop over `&bs`
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for _v in vec.iter().next() { } //~ERROR you are iterating over `Iterator::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().map(|x| out.push(x)).collect::<Vec<_>>(); //~ERROR you are collect()ing an iterator
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let _y = vec.iter().map(|x| out.push(x)).collect::<Vec<_>>(); // this is fine
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// Loop with explicit counter variable
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let mut _index = 0;
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for _v in &vec { _index += 1 } //~ERROR the variable `_index` is used as a loop counter
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let mut _index = 1;
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_index = 0;
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for _v in &vec { _index += 1 } //~ERROR the variable `_index` is used as a loop counter
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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 { _index += 1 }
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let mut _index = 0;
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_index += 1;
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for _v in &vec { _index += 1 }
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let mut _index = 0;
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if true { _index = 1 }
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for _v in &vec { _index += 1 }
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let mut _index = 0;
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let mut _index = 1;
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for _v in &vec { _index += 1 }
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let mut _index = 0;
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for _v in &vec { _index += 1; _index += 1 }
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let mut _index = 0;
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for _v in &vec { _index *= 2; _index += 1 }
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let mut _index = 0;
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for _v in &vec { _index = 1; _index += 1 }
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let mut _index = 0;
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for _v in &vec { let mut _index = 0; _index += 1 }
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let mut _index = 0;
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for _v in &vec { _index += 1; _index = 0; }
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let mut _index = 0;
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for _v in &vec { for _x in 0..1 { _index += 1; }; _index += 1 }
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let mut _index = 0;
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for x in &vec { if *x == 1 { _index += 1 } }
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let mut _index = 0;
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if true { _index = 1 };
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for _v in &vec { _index += 1 }
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let mut _index = 1;
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if false { _index = 0 };
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for _v in &vec { _index += 1 }
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let mut index = 0;
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{ let mut _x = &mut index; }
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for _v in &vec { _index += 1 }
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let mut index = 0;
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for _v in &vec { index += 1 }
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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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//~^ you seem to want to iterate on a map's values
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//~| HELP use the corresponding method
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//~| SUGGESTION for v in &m.values()
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let _v = v;
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}
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let rm = &m;
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for (k, _value) in rm {
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//~^ you seem to want to iterate on a map's keys
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//~| HELP use the corresponding method
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//~| SUGGESTION for k in rm.keys()
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let _k = k;
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}
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test_for_kv_map();
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}
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#[allow(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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