504 lines
8.2 KiB
Rust
504 lines
8.2 KiB
Rust
#![feature(plugin, step_by, inclusive_range_syntax)]
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#![plugin(clippy)]
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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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#[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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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 precedence when next() is the last call 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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#[deny(needless_range_loop, explicit_iter_loop, explicit_into_iter_loop, iter_next_loop, reverse_range_loop, explicit_counter_loop, for_kv_map)]
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#[deny(unused_collect)]
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#[allow(linkedlist, shadow_unrelated, unnecessary_mut_passed, cyclomatic_complexity, similar_names)]
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#[allow(many_single_char_names)]
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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() { let _ = vec[i]; }
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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() { // 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 { // 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 { // 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).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 {
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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) { // 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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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() {} //~ERROR it is more idiomatic to loop over `&array`
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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().map(|x| out.push(x)).collect::<Vec<_>>();
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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 }
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let mut _index = 1;
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_index = 0;
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for _v in &vec { _index += 1 }
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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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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 necesarry, but the test tests that we don't 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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}
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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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